[PATCH] Add auditd listener and remote audit protocol
by DJ Delorie
Second in a series, a bit bigger than the first one.
(http://www.redhat.com/archives/linux-audit/2008-August/msg00070.html)
The goal of this patch is to add the server side of the remote logging
feature. To this end, a new auditd-listener.c is added which listens
on a TCP port for connections from other systems' audisp-remote
plugins. A new (private) protocol is added which prepends each
message with a header, giving length, status, version, and sequence
information. Each message begets a reply from the server, so we can
pass along status like "disk full" or "ok". Currently, these call a
set of stub functions, as the details of performing appropriate
actions from the plugin are yet to be decided.
The remote plugin has a new option "format" for "ascii" or "managed"
to choose between the old protocol (ascii strings) and the new one
(the header with ACK, default).
The listener will accept either format. It has new options for the
listen port, accept queue size, and acceptable client-side ports.
Comments?
DJ
Proposed ChangeLog entry:
- Add TCP listener and managed remote protocol features.
diff -N -U 3 -x .svn -r pristine/audisp/plugins/remote/audisp-remote.c trunk/audisp/plugins/remote/audisp-remote.c
--- pristine/audisp/plugins/remote/audisp-remote.c 2008-08-04 12:47:28.000000000 -0400
+++ trunk/audisp/plugins/remote/audisp-remote.c 2008-08-14 14:10:48.000000000 -0400
@@ -30,7 +30,11 @@
#include <unistd.h>
#include <stdlib.h>
#include <errno.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
#include "libaudit.h"
+#include "private.h"
#include "remote-config.h"
#define CONFIG_FILE "/etc/audisp/audisp-remote.conf"
@@ -68,6 +72,56 @@
hup = 0;
}
+/*
+ * Handlers for various events coming back from the remote server.
+ * Return -1 if the remote dispatcher should exit.
+ */
+
+/* Loss of sync - got an invalid response. */
+static int sync_error_handler (const char *why)
+{
+ /* "why" has human-readable details on why we've lost (or will
+ be losing) sync. */
+ syslog (LOG_ERR, "lost/losing sync, %s", why);
+ return -1;
+}
+
+static int remote_disk_low_handler (const char *message)
+{
+ syslog (LOG_WARNING, "remote disk low, %s", message);
+ return 0;
+}
+
+static int remote_disk_full_handler (const char *message)
+{
+ syslog (LOG_ERR, "remote disk full, %s", message);
+ return -1;
+}
+
+static int remote_disk_error_handler (const char *message)
+{
+ syslog (LOG_ERR, "remote disk error, %s", message);
+ return -1;
+}
+
+static int remote_server_ending_handler (const char *message)
+{
+ syslog (LOG_INFO, "remote server ending, %s", message);
+ return -1;
+}
+
+static int generic_remote_error_handler (const char *message)
+{
+ stop = 1;
+ syslog(LOG_INFO, "audisp-remote: remote error: %s", message);
+ return -1;
+}
+static int generic_remote_warning_handler (const char *message)
+{
+ syslog(LOG_INFO, "audisp-remote: remote warning: %s", message);
+ return 0;
+}
+
int main(int argc, char *argv[])
{
@@ -122,6 +176,7 @@
struct addrinfo *ai;
struct addrinfo hints;
char remote[BUF_SIZE];
+ int one=1;
memset(&hints, '\0', sizeof(hints));
hints.ai_flags = AI_ADDRCONFIG|AI_NUMERICSERV;
@@ -140,12 +195,35 @@
freeaddrinfo(ai);
return -1;
}
+
+ setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof (int));
+
+ if (config.local_port != 0) {
+ struct sockaddr_in address;
+
+ memset (&address, 0, sizeof(address));
+ address.sin_family = htons(AF_INET);
+ address.sin_port = htons(config.local_port);
+ address.sin_addr.s_addr = htonl(INADDR_ANY);
+
+ if ( bind ( sock, (struct sockaddr *)&address, sizeof(address)) ) {
+ syslog(LOG_ERR, "Cannot bind local socket to port %d - exiting",
+ config.local_port);
+ close(sock);
+ return -1;
+ }
+
+ }
if (connect(sock, ai->ai_addr, ai->ai_addrlen)) {
syslog(LOG_ERR, "Error connecting to %s: %s - exiting",
config.remote_server, strerror(errno));
freeaddrinfo(ai);
return -1;
}
+
+ setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (char *)&one, sizeof (int));
+ setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (char *)&one, sizeof (int));
+
freeaddrinfo(ai);
return 0;
}
@@ -166,16 +244,143 @@
return rc;
}
-static int relay_sock(const char *s, size_t len)
+static int ar_write (int sock, const void *buf, int len)
{
int rc;
-
do {
- rc = write(sock, s, len);
+ rc = write(sock, buf, len);
} while (rc < 0 && errno == EINTR);
- if (rc > 0)
- return 0;
- return -1;
+ return rc;
+}
+
+static int ar_read (int sock, void *buf, int len)
+{
+ unsigned char *obuf = buf;
+ int rc = 0, r;
+ while (len > 0) {
+ do {
+ r = read(sock, buf, len);
+ } while (r < 0 && errno == EINTR);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+ rc += r;
+ buf = (void *)((char *)buf + r);
+ len -= r;
+ }
+ return rc;
+}
+
+static int relay_sock_ascii(const char *s, size_t len)
+{
+ int rc;
+
+ rc = ar_write(sock, s, len);
+ if (rc <= 0) {
+ stop = 1;
+ syslog(LOG_ERR, "connection to %s closed unexpectedly - exiting",
+ config.remote_server);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int relay_sock_managed(const char *s, size_t len)
+{
+ static int sequence_id = 1;
+ int rc;
+ unsigned char header[AUDIT_RMW_HEADER_SIZE];
+ int hver, mver;
+ uint32_t magic, type, rlen, seq;
+ char msg[MAX_AUDIT_MESSAGE_LENGTH+1];
+
+ sequence_id ++;
+ AUDIT_RMW_PACK_HEADER (header, 0, 0, len, sequence_id);
+ rc = ar_write(sock, header, AUDIT_RMW_HEADER_SIZE);
+ if (rc <= 0) {
+ stop = 1;
+ syslog(LOG_ERR, "connection to %s closed unexpectedly - exiting",
+ config.remote_server);
+ return -1;
+ }
+
+ rc = ar_write(sock, s, len);
+ if (rc <= 0) {
+ stop = 1;
+ syslog(LOG_ERR, "connection to %s closed unexpectedly - exiting",
+ config.remote_server);
+ return -1;
+ }
+
+ rc = ar_read (sock, header, AUDIT_RMW_HEADER_SIZE);
+ if (rc < 16) {
+ stop = 1;
+ syslog(LOG_ERR, "connection to %s closed unexpectedly - exiting",
+ config.remote_server);
+ return -1;
+ }
+
+
+ if (! AUDIT_RMW_IS_MAGIC (header, AUDIT_RMW_HEADER_SIZE))
+ /* FIXME: the right thing to do here is close the socket and start a new one. */
+ return sync_error_handler ("bad magic number");
+
+ AUDIT_RMW_UNPACK_HEADER (header, hver, mver, type, rlen, seq);
+
+ if (rlen > MAX_AUDIT_MESSAGE_LENGTH)
+ return sync_error_handler ("message too long");
+
+ if (rlen > 0
+ && ar_read (sock, msg, rlen) < rlen)
+ return sync_error_handler ("ran out of data reading reply");
+ msg[rlen] = 0;
+
+ if (seq != sequence_id)
+ /* FIXME: should we read another header and
+ see if it matches? If so, we need to deal
+ with timeouts. */
+ return sync_error_handler ("mismatched response");
+
+ /* Specific errors we know how to deal with. */
+
+ if (type == AUDIT_RMW_TYPE_ENDING)
+ return remote_server_ending_handler (msg);
+ if (type == AUDIT_RMW_TYPE_DISKLOW)
+ return remote_disk_low_handler (msg);
+ if (type == AUDIT_RMW_TYPE_DISKFULL)
+ return remote_disk_full_handler (msg);
+ if (type == AUDIT_RMW_TYPE_DISKERROR)
+ return remote_disk_error_handler (msg);
+
+ /* Generic errors. */
+ if (type & AUDIT_RMW_TYPE_FATALMASK)
+ return generic_remote_error_handler (msg);
+ if (type & AUDIT_RMW_TYPE_WARNMASK)
+ return generic_remote_warning_handler (msg);
+
+ return 0;
+}
+
+static int relay_sock(const char *s, size_t len)
+{
+ int rc;
+
+ switch (config.format)
+ {
+ case F_MANAGED:
+ rc = relay_sock_managed (s, len);
+ break;
+ case F_ASCII:
+ rc = relay_sock_ascii (s, len);
+ break;
+ default:
+ rc = -1;
+ break;
+ }
+
+ return rc;
}
static int relay_event(const char *s, size_t len)
diff -N -U 3 -x .svn -r pristine/audisp/plugins/remote/audisp-remote.conf trunk/audisp/plugins/remote/audisp-remote.conf
--- pristine/audisp/plugins/remote/audisp-remote.conf 2008-08-04 12:47:28.000000000 -0400
+++ trunk/audisp/plugins/remote/audisp-remote.conf 2008-08-14 15:11:23.000000000 -0400
@@ -5,8 +5,9 @@
remote_server =
port = 60
+#local_port =
transport = tcp
mode = immediate
queue_depth = 20
fail_action = SYSLOG
-
+format = managed
diff -N -U 3 -x .svn -r pristine/audisp/plugins/remote/audisp-remote.conf.5 trunk/audisp/plugins/remote/audisp-remote.conf.5
--- pristine/audisp/plugins/remote/audisp-remote.conf.5 2008-08-04 12:47:28.000000000 -0400
+++ trunk/audisp/plugins/remote/audisp-remote.conf.5 2008-08-14 15:36:53.000000000 -0400
@@ -11,6 +11,13 @@
.I port
This option is an unsigned integer that indicates what port to connect to on the remote machine.
.TP
+.I local_port
+This option is an unsigned integer that indicates what local port to
+connect from on the local machine. If unspecified (the default) or
+set to the word
+.I any
+then any available unpriviledged port is used.
+.TP
.I transport
This parameter tells the remote logging app how to send events to the remote system. Valid values are
.IR tcp ", and " ssl ".
@@ -55,7 +62,22 @@
option will cause the remote logging app to put the computer system in single user mode.
.I halt
option will cause the remote logging app to shutdown the computer system.
+.TP
+.I format
+This parameter tells the remote logging app what data format will be
+used for the messages sent over the network. The default is
+.I managed
+which adds some overhead to ensure each message is properly handled on
+the remote end, and to receive status messages from the remote server.
+If
+.I ascii
+is given instead, each message is a simple ASCII text line with no
+overhead at all.
+.SH "NOTES"
+Specifying a local port may make it difficult to restart the audit
+subsystem due to the previous connection being in a TIME_WAIT state,
+if you're reconnecting to and from the same hosts and ports as before.
.SH "SEE ALSO"
.BR audispd (8),
.BR audisp-remote(8).
diff -N -U 3 -x .svn -r pristine/audisp/plugins/remote/remote-config.c trunk/audisp/plugins/remote/remote-config.c
--- pristine/audisp/plugins/remote/remote-config.c 2008-08-04 12:47:28.000000000 -0400
+++ trunk/audisp/plugins/remote/remote-config.c 2008-08-13 22:19:31.000000000 -0400
@@ -62,6 +62,8 @@
remote_conf_t *config);
static int port_parser(struct nv_pair *nv, int line,
remote_conf_t *config);
+static int local_port_parser(struct nv_pair *nv, int line,
+ remote_conf_t *config);
static int transport_parser(struct nv_pair *nv, int line,
remote_conf_t *config);
static int mode_parser(struct nv_pair *nv, int line,
@@ -70,16 +72,20 @@
remote_conf_t *config);
static int fail_action_parser(struct nv_pair *nv, int line,
remote_conf_t *config);
+static int format_parser(struct nv_pair *nv, int line,
+ remote_conf_t *config);
static int sanity_check(remote_conf_t *config, const char *file);
static const struct kw_pair keywords[] =
{
{"remote_server", server_parser, 0 },
{"port", port_parser, 0 },
+ {"local_port", local_port_parser, 0 },
{"transport", transport_parser, 0 },
{"mode", mode_parser, 0 },
{"queue_depth", depth_parser, 0 },
{"fail_action", fail_action_parser, 0 },
+ {"format", format_parser, 0 },
{ NULL, NULL }
};
@@ -107,6 +113,13 @@
{ NULL, 0 }
};
+static const struct nv_list format_words[] =
+{
+ {"ascii", F_ASCII },
+ {"managed", F_MANAGED },
+ { NULL, 0 }
+};
+
/*
* Set everything to its default value
*/
@@ -114,11 +127,13 @@
{
config->remote_server = NULL;
config->port = 60;
+ config->local_port = 0;
config->port = T_TCP;
config->mode = M_IMMEDIATE;
config->queue_depth = 20;
config->fail_action = F_SYSLOG;
config->fail_exe = NULL;
+ config->format = F_MANAGED;
}
int load_config(remote_conf_t *config, const char *file)
@@ -392,6 +407,46 @@
return 0;
}
+static int local_port_parser(struct nv_pair *nv, int line, remote_conf_t *config)
+{
+ const char *ptr = nv->value;
+ int i;
+
+ if (strcasecmp (ptr, "any") == 0) {
+ config->local_port = 0;
+ return 0;
+ }
+
+ /* check that all chars are numbers */
+ for (i=0; ptr[i]; i++) {
+ if (!isdigit(ptr[i])) {
+ syslog(LOG_ERR,
+ "Value %s should only be numbers - line %d",
+ nv->value, line);
+ return 1;
+ }
+ }
+
+ /* convert to unsigned int */
+ errno = 0;
+ i = strtoul(nv->value, NULL, 10);
+ if (errno) {
+ syslog(LOG_ERR,
+ "Error converting string to a number (%s) - line %d",
+ strerror(errno), line);
+ return 1;
+ }
+ /* Check its range */
+ if (i > INT_MAX) {
+ syslog(LOG_ERR,
+ "Error - converted number (%s) is too large - line %d",
+ nv->value, line);
+ return 1;
+ }
+ config->local_port = (unsigned int)i;
+ return 0;
+}
+
static int transport_parser(struct nv_pair *nv, int line, remote_conf_t *config)
{
int i;
@@ -477,6 +532,20 @@
return 1;
}
+static int format_parser(struct nv_pair *nv, int line,
+ remote_conf_t *config)
+{
+ int i;
+ for (i=0; format_words[i].name != NULL; i++) {
+ if (strcasecmp(nv->value, format_words[i].name) == 0) {
+ config->format = format_words[i].option;
+ return 0;
+ }
+ }
+ syslog(LOG_ERR, "Option %s not found - line %d", nv->value, line);
+ return 1;
+}
+
/*
* This function is where we do the integrated check of the audispd config
* options. At this point, all fields have been read. Returns 0 if no
diff -N -U 3 -x .svn -r pristine/audisp/plugins/remote/remote-config.h trunk/audisp/plugins/remote/remote-config.h
--- pristine/audisp/plugins/remote/remote-config.h 2008-08-04 12:47:28.000000000 -0400
+++ trunk/audisp/plugins/remote/remote-config.h 2008-08-13 22:17:19.000000000 -0400
@@ -27,16 +27,19 @@
typedef enum { M_IMMEDIATE, M_STORE_AND_FORWARD } mode_t;
typedef enum { T_TCP, T_SSL, T_GSSAPI, T_LABELED } transport_t;
typedef enum { F_IGNORE, F_SYSLOG, F_EXEC, F_SUSPEND, F_SINGLE, F_HALT } fail_t;
+typedef enum { F_ASCII, F_MANAGED } format_t;
typedef struct remote_conf
{
const char *remote_server;
unsigned int port;
+ unsigned int local_port;
transport_t transport;
mode_t mode;
unsigned int queue_depth;
fail_t fail_action;
const char *fail_exe;
+ format_t format;
} remote_conf_t;
void clear_config(remote_conf_t *config);
diff -N -U 3 -x .svn -r pristine/docs/auditd.conf.5 trunk/docs/auditd.conf.5
--- pristine/docs/auditd.conf.5 2008-08-04 12:47:31.000000000 -0400
+++ trunk/docs/auditd.conf.5 2008-08-14 15:35:29.000000000 -0400
@@ -212,6 +212,26 @@
option will cause the audit daemon to put the computer system in single user mode.
.I halt
option will cause the audit daemon to shutdown the computer system.
+.TP
+.I tcp_listen_port
+This is a numeric value in the range 1..65535 which, if specified,
+causes auditd to listen on the corresponding TCP port for audit
+records from remote systems.
+.TP
+.I tcp_listen_queue
+This is a numeric value which indicates how many pending (requested
+but unaccepted) connections are allowed. The default is 5. Setting
+this too small may cause connections to be rejected if too many hosts
+start up at exactly the same time, such as after a power failure.
+.TP
+.I tcp_client_ports
+This parameter may be a single numeric value or two values separated
+by a dash (no spaces allowed). It indicates which client ports are
+allowed for incoming connections. If not specified, any port is
+allowed. Allowed values are 1..65535. For example, to require the
+client use a priviledged port, specify
+.I 1-1023
+for this parameter.
.SH NOTES
In a CAPP environment, the audit trail is considered so important that access to system resources must be denied if an audit trail cannot be created. In this environment, it would be suggested that /var/log/audit be on its own partition. This is to ensure that space detection is accurate and that no other process comes along and consumes part of it.
@@ -227,6 +247,11 @@
The disk_full_action is triggered when no more room exists on the partition. All access should be terminated since no more audit capability exists. This can be set to either single or halt.
.PP
The disk_error_action should be set to syslog, single, or halt depending on your local policies regarding handling of hardware malfunctions.
+.PP
+Specifying a single allowed client port may make it difficult for the
+client to restart their audit subsystem, as it will be unable to
+recreate a connection with the same host addresses and ports until the
+connection closure TIME_WAIT state times out.
.SH FILES
.TP
diff -N -U 3 -x .svn -r pristine/init.d/auditd.conf trunk/init.d/auditd.conf
--- pristine/init.d/auditd.conf 2008-08-04 12:47:28.000000000 -0400
+++ trunk/init.d/auditd.conf 2008-08-14 15:22:08.000000000 -0400
@@ -22,4 +22,6 @@
admin_space_left_action = SUSPEND
disk_full_action = SUSPEND
disk_error_action = SUSPEND
-
+#tcp_listen_port =
+#tcp_listen_queue = 5
+#tcp_client_ports = 1024-65535
diff -N -U 3 -x .svn -r pristine/lib/libaudit.h trunk/lib/libaudit.h
--- pristine/lib/libaudit.h 2008-08-04 12:47:34.000000000 -0400
+++ trunk/lib/libaudit.h 2008-08-14 10:58:46.000000000 -0400
@@ -413,10 +413,6 @@
};
};
-struct auditd_reply_list {
- struct audit_reply reply;
- struct auditd_reply_list *next;
-};
//
// End of ABI control
//////////////////////////////////////////////////////
diff -N -U 3 -x .svn -r pristine/lib/private.h trunk/lib/private.h
--- pristine/lib/private.h 2008-08-04 12:47:34.000000000 -0400
+++ trunk/lib/private.h 2008-08-14 10:58:46.000000000 -0400
@@ -55,6 +55,83 @@
;
#endif
+/* This structure is for protocol reference only. All fields are
+ packed and in network order (LSB first). */
+struct auditd_remote_message_wrapper {
+ /* The magic number shall never have LF (0x0a) as one of its bytes. */
+ uint32_t magic;
+ /* Bumped when the layout of this structure changes. */
+ uint8_t header_version;
+ /* The minimum support needed to understand this message type.
+ * Normally zero. */
+ uint8_t message_version;
+ /* Upper 8 bits are generic type, see below. */
+ uint32_t type;
+ /* Number of bytes that follow this header Must be 0..MAX_AUDIT_MESSAGE_LENGTH. */
+ uint16_t length;
+ /* Copied from message to its reply. */
+ uint32_t sequence_id;
+ /* The message follows for LENGTH bytes. */
+};
+
+#define AUDIT_RMW_HEADER_SIZE 16
+/* The magic number shall never have LF (0x0a) as one of its bytes. */
+#define AUDIT_RMW_MAGIC 0xff0000feUL
+
+#define AUDIT_RMW_HEADER_VERSION 0
+
+/* If set, this is a reply. */
+#define AUDIT_RMW_TYPE_REPLYMASK 0x40000000
+/* If set, this reply indicates a fatal error of some sort. */
+#define AUDIT_RMW_TYPE_FATALMASK 0x20000000
+/* If set, this reply indicates success but with some warnings. */
+#define AUDIT_RMW_TYPE_WARNMASK 0x10000000
+/* This part of the message type is the details for the above. */
+#define AUDIT_RMW_TYPE_DETAILMASK 0x0fffffff
+
+/* Version 0 messages. */
+#define AUDIT_RMW_TYPE_MESSAGE 0x00000000
+#define AUDIT_RMW_TYPE_ACK 0x40000000
+#define AUDIT_RMW_TYPE_ENDING 0x40000001
+#define AUDIT_RMW_TYPE_DISKLOW 0x50000001
+#define AUDIT_RMW_TYPE_DISKFULL 0x60000001
+#define AUDIT_RMW_TYPE_DISKERROR 0x60000002
+
+/* These next four should not be called directly. */
+#define _AUDIT_RMW_PUTN32(header,i,v) \
+ header[i] = v & 0xff; \
+ header[i+1] = (v>>8) & 0xff; \
+ header[i+2] = (v>>16) & 0xff; \
+ header[i+3] = (v>>24) & 0xff;
+#define _AUDIT_RMW_PUTN16(header,i,v) \
+ header[i] = v & 0xff; \
+ header[i+1] = (v>>8) & 0xff;
+#define _AUDIT_RMW_GETN32(header,i) \
+ (header[i] | (header[i+1]<<8) | (header[i+2]<<16) | (header[i+3]<<24))
+#define _AUDIT_RMW_GETN16(header,i) \
+ (header[i] | (header[i+1]<<8))
+
+/* For these, HEADER must by of type "unsigned char *" or "unsigned
+ char []" */
+
+#define AUDIT_RMW_PACK_HEADER(header,mver,type,len,seq) \
+ _AUDIT_RMW_PUTN32 (header,0, AUDIT_RMW_MAGIC); \
+ header[4] = AUDIT_RMW_HEADER_VERSION; \
+ header[5] = mver; \
+ _AUDIT_RMW_PUTN32 (header,6, type); \
+ _AUDIT_RMW_PUTN16 (header,10, len); \
+ _AUDIT_RMW_PUTN32 (header,12, seq);
+
+#define AUDIT_RMW_IS_MAGIC(header,length) \
+ (length >= 4 && _AUDIT_RMW_GETN32 (header,0) == AUDIT_RMW_MAGIC)
+
+#define AUDIT_RMW_UNPACK_HEADER(header,hver,mver,type,len,seq) \
+ hver = header[4]; \
+ mver = header[5]; \
+ type = _AUDIT_RMW_GETN32 (header,6); \
+ len = _AUDIT_RMW_GETN16 (header,10); \
+ seq = _AUDIT_RMW_GETN32 (header,12);
+
/* General */
extern int audit_send(int fd, int type, const void *data, unsigned int size)
hidden;
diff -N -U 3 -x .svn -r pristine/src/Makefile.am trunk/src/Makefile.am
--- pristine/src/Makefile.am 2008-08-07 21:18:16.000000000 -0400
+++ trunk/src/Makefile.am 2008-08-08 16:41:07.000000000 -0400
@@ -27,9 +27,9 @@
LIBS = -Lmt -lauditmt -Llibev -lev -lrt -lm
LDADD = -lpthread
AM_CFLAGS = -D_REENTRANT -D_GNU_SOURCE
-noinst_HEADERS = auditd-config.h auditd-event.h ausearch-llist.h ausearch-options.h auditctl-llist.h aureport-options.h ausearch-parse.h aureport-scan.h ausearch-lookup.h ausearch-int.h auditd-dispatch.h ausearch-string.h ausearch-nvpair.h ausearch-common.h ausearch-avc.h ausearch-time.h
+noinst_HEADERS = auditd-config.h auditd-event.h auditd-listen.h ausearch-llist.h ausearch-options.h auditctl-llist.h aureport-options.h ausearch-parse.h aureport-scan.h ausearch-lookup.h ausearch-int.h auditd-dispatch.h ausearch-string.h ausearch-nvpair.h ausearch-common.h ausearch-avc.h ausearch-time.h
-auditd_SOURCES = auditd.c auditd-event.c auditd-config.c auditd-reconfig.c auditd-sendmail.c auditd-dispatch.c
+auditd_SOURCES = auditd.c auditd-event.c auditd-config.c auditd-reconfig.c auditd-sendmail.c auditd-dispatch.c auditd-listen.c
auditd_CFLAGS = -fPIE -DPIE -g -D_REENTRANT -D_GNU_SOURCE
auditd_LDFLAGS = -pie -Wl,-z,relro
auditd_DEPENDENCIES = mt/libauditmt.a libev/libev.a
diff -N -U 3 -x .svn -r pristine/src/auditd-config.c trunk/src/auditd-config.c
--- pristine/src/auditd-config.c 2008-08-07 17:32:20.000000000 -0400
+++ trunk/src/auditd-config.c 2008-08-08 15:56:13.000000000 -0400
@@ -39,6 +39,8 @@
#include "libaudit.h"
#include "private.h"
+#define TCP_PORT_MAX 65535
+
/* Local prototypes */
struct nv_pair
{
@@ -103,6 +105,12 @@
struct daemon_conf *config);
static int priority_boost_parser(struct nv_pair *nv, int line,
struct daemon_conf *config);
+static int tcp_listen_port_parser(struct nv_pair *nv, int line,
+ struct daemon_conf *config);
+static int tcp_listen_queue_parser(struct nv_pair *nv, int line,
+ struct daemon_conf *config);
+static int tcp_client_ports_parser(struct nv_pair *nv, int line,
+ struct daemon_conf *config);
static int sanity_check(struct daemon_conf *config);
static const struct kw_pair keywords[] =
@@ -127,6 +135,9 @@
{"disk_full_action", disk_full_action_parser, 1 },
{"disk_error_action", disk_error_action_parser, 1 },
{"priority_boost", priority_boost_parser, 0 },
+ {"tcp_listen_port", tcp_listen_port_parser, 0 },
+ {"tcp_listen_queue", tcp_listen_queue_parser, 0 },
+ {"tcp_client_ports", tcp_client_ports_parser, 0 },
{ NULL, NULL }
};
@@ -227,6 +238,10 @@
config->disk_full_exe = NULL;
config->disk_error_action = FA_SYSLOG;
config->disk_error_exe = NULL;
+ config->tcp_listen_port = 0;
+ config->tcp_listen_queue = 5;
+ config->tcp_client_min_port = 0;
+ config->tcp_client_max_port = TCP_PORT_MAX;
}
static log_test_t log_test = TEST_AUDITD;
@@ -1109,6 +1124,172 @@
return 0;
}
+static int tcp_listen_port_parser(struct nv_pair *nv, int line,
+ struct daemon_conf *config)
+{
+ const char *ptr = nv->value;
+ unsigned long i;
+
+ audit_msg(LOG_DEBUG, "tcp_listen_port_parser called with: %s",
+ nv->value);
+
+ /* check that all chars are numbers */
+ for (i=0; ptr[i]; i++) {
+ if (!isdigit(ptr[i])) {
+ audit_msg(LOG_ERR,
+ "Value %s should only be numbers - line %d",
+ nv->value, line);
+ return 1;
+ }
+ }
+
+ /* convert to unsigned int */
+ errno = 0;
+ i = strtoul(nv->value, NULL, 10);
+ if (errno) {
+ audit_msg(LOG_ERR,
+ "Error converting string to a number (%s) - line %d",
+ strerror(errno), line);
+ return 1;
+ }
+ /* Check its range */
+ if (i > TCP_PORT_MAX) {
+ audit_msg(LOG_ERR,
+ "Error - converted number (%s) is too large - line %d",
+ nv->value, line);
+ return 1;
+ }
+ if (i < 1) {
+ audit_msg(LOG_ERR,
+ "Error - converted number (%s) is too small - line %d",
+ nv->value, line);
+ return 1;
+ }
+ config->tcp_listen_port = (unsigned int)i;
+ return 0;
+}
+
+static int tcp_listen_queue_parser(struct nv_pair *nv, int line,
+ struct daemon_conf *config)
+{
+ const char *ptr = nv->value;
+ unsigned long i;
+
+ audit_msg(LOG_DEBUG, "tcp_listen_queue_parser called with: %s",
+ nv->value);
+
+ /* check that all chars are numbers */
+ for (i=0; ptr[i]; i++) {
+ if (!isdigit(ptr[i])) {
+ audit_msg(LOG_ERR,
+ "Value %s should only be numbers - line %d",
+ nv->value, line);
+ return 1;
+ }
+ }
+
+ /* convert to unsigned int */
+ errno = 0;
+ i = strtoul(nv->value, NULL, 10);
+ if (errno) {
+ audit_msg(LOG_ERR,
+ "Error converting string to a number (%s) - line %d",
+ strerror(errno), line);
+ return 1;
+ }
+ /* Check its range. While this value is technically
+ unlimited, it's limited by the kernel, and we limit it here
+ for sanity. */
+ if (i > TCP_PORT_MAX) {
+ audit_msg(LOG_ERR,
+ "Error - converted number (%s) is too large - line %d",
+ nv->value, line);
+ return 1;
+ }
+ if (i < 1) {
+ audit_msg(LOG_ERR,
+ "Error - converted number (%s) is too small - line %d",
+ nv->value, line);
+ return 1;
+ }
+ config->tcp_listen_queue = (unsigned int)i;
+ return 0;
+}
+
+static int tcp_client_ports_parser(struct nv_pair *nv, int line,
+ struct daemon_conf *config)
+{
+ const char *ptr = nv->value;
+ unsigned long i, minv, maxv;
+ const char *saw_dash = NULL;
+
+ audit_msg(LOG_DEBUG, "tcp_listen_queue_parser called with: %s",
+ nv->value);
+
+ /* check that all chars are numbers, with an optional inclusive '-'. */
+ for (i=0; ptr[i]; i++) {
+ if (i > 0 && ptr[i] == '-' && ptr[i+1] != '\0') {
+ saw_dash = ptr + i;
+ continue;
+ }
+ if (!isdigit(ptr[i])) {
+ audit_msg(LOG_ERR,
+ "Value %s should only be numbers, or two numbers separated by a dash - line %d",
+ nv->value, line);
+ return 1;
+ }
+ }
+ for (; ptr[i]; i++) {
+ if (!isdigit(ptr[i])) {
+ audit_msg(LOG_ERR,
+ "Value %s should only be numbers, or two numbers separated by a dash - line %d",
+ nv->value, line);
+ return 1;
+ }
+ }
+
+ /* convert to unsigned int */
+ errno = 0;
+ maxv = minv = strtoul(nv->value, NULL, 10);
+ if (errno) {
+ audit_msg(LOG_ERR,
+ "Error converting string to a number (%s) - line %d",
+ strerror(errno), line);
+ return 1;
+ }
+ if (saw_dash) {
+ maxv = strtoul(saw_dash + 1, NULL, 10);
+ if (errno) {
+ audit_msg(LOG_ERR,
+ "Error converting string to a number (%s) - line %d",
+ strerror(errno), line);
+ return 1;
+ }
+ }
+ /* Check their ranges. */
+ if (minv > TCP_PORT_MAX) {
+ audit_msg(LOG_ERR,
+ "Error - converted number (%d) is too large - line %d",
+ minv, line);
+ return 1;
+ }
+ if (maxv > TCP_PORT_MAX) {
+ audit_msg(LOG_ERR,
+ "Error - converted number (%d) is too large - line %d",
+ maxv, line);
+ return 1;
+ }
+ if (minv > maxv) {
+ audit_msg(LOG_ERR,
+ "Error - converted range (%d-%d) is reversed - line %d",
+ minv, maxv, line);
+ return 1;
+ }
+ config->tcp_client_min_port = (unsigned int)minv;
+ config->tcp_client_max_port = (unsigned int)maxv;
+ return 0;
+}
+
/*
* This function is where we do the integrated check of the audit config
* options. At this point, all fields have been read. Returns 0 if no
diff -N -U 3 -x .svn -r pristine/src/auditd-config.h trunk/src/auditd-config.h
--- pristine/src/auditd-config.h 2008-08-04 12:47:30.000000000 -0400
+++ trunk/src/auditd-config.h 2008-08-14 15:33:28.000000000 -0400
@@ -70,6 +70,10 @@
const char *disk_full_exe;
failure_action_t disk_error_action;
const char *disk_error_exe;
+ unsigned long tcp_listen_port;
+ unsigned long tcp_listen_queue;
+ unsigned long tcp_client_min_port;
+ unsigned long tcp_client_max_port;
};
void set_allow_links(int allow);
@@ -80,7 +84,9 @@
int resolve_node(struct daemon_conf *config);
void init_config_manager(void);
+#ifdef AUDITD_EVENT_H
int start_config_manager(struct auditd_reply_list *rep);
+#endif
void shutdown_config(void);
void free_config(struct daemon_conf *config);
diff -N -U 3 -x .svn -r pristine/src/auditd-event.c trunk/src/auditd-event.c
--- pristine/src/auditd-event.c 2008-08-04 12:47:30.000000000 -0400
+++ trunk/src/auditd-event.c 2008-08-13 21:56:24.000000000 -0400
@@ -148,6 +148,36 @@
dequeue'r is responsible for freeing the memory. */
void enqueue_event(struct auditd_reply_list *rep)
{
+ char *buf;
+ int len;
+
+ rep->ack_socket = 0;
+ rep->sequence_id = 0;
+
+ switch (consumer_data.config->log_format)
+ {
+ case LF_RAW:
+ buf = format_raw(&rep->reply, consumer_data.config);
+ break;
+ case LF_NOLOG:
+ return;
+ default:
+ audit_msg(LOG_ERR,
+ "Illegal log format detected %d",
+ consumer_data.config->log_format);
+ return;
+ }
+
+ len = strlen (buf);
+ if (len < MAX_AUDIT_MESSAGE_LENGTH - 1)
+ memcpy (rep->reply.msg.data, buf, len+1);
+ else
+ {
+ /* FIXME: is truncation the right thing to do? */
+ memcpy (rep->reply.msg.data, buf, MAX_AUDIT_MESSAGE_LENGTH-1);
+ rep->reply.msg.data[MAX_AUDIT_MESSAGE_LENGTH-1] = 0;
+ }
+
rep->next = NULL; /* new packet goes at end - so zero this */
pthread_mutex_lock(&consumer_data.queue_lock);
@@ -164,6 +194,45 @@
pthread_mutex_unlock(&consumer_data.queue_lock);
}
+/* This function takes a preformatted message and places it on the
+ queue. The dequeue'r is responsible for freeing the memory. */
+void enqueue_formatted_event(char *msg, int ack_socket, uint32_t sequence_id)
+{
+ int len;
+ struct auditd_reply_list *rep;
+
+ rep = (struct auditd_reply_list *) calloc (1, sizeof (*rep));
+ if (rep == NULL) {
+ audit_msg(LOG_ERR, "Cannot allocate audit reply");
+ return;
+ }
+
+ rep->ack_socket = ack_socket;
+ rep->sequence_id = sequence_id;
+
+ len = strlen (msg);
+ if (len < MAX_AUDIT_MESSAGE_LENGTH - 1)
+ memcpy (rep->reply.msg.data, msg, len+1);
+ else {
+ /* FIXME: is truncation the right thing to do? */
+ memcpy (rep->reply.msg.data, msg, MAX_AUDIT_MESSAGE_LENGTH-1);
+ rep->reply.msg.data[MAX_AUDIT_MESSAGE_LENGTH-1] = 0;
+ }
+
+ pthread_mutex_lock(&consumer_data.queue_lock);
+ if (consumer_data.head == NULL) {
+ consumer_data.head = consumer_data.tail = rep;
+ pthread_cond_signal(&consumer_data.queue_nonempty);
+ } else {
+ /* FIXME: wait for room on the queue */
+
+ /* OK there's room...add it in */
+ consumer_data.tail->next = rep; /* link in at end */
+ consumer_data.tail = rep; /* move end to newest */
+ }
+ pthread_mutex_unlock(&consumer_data.queue_lock);
+}
+
void resume_logging(void)
{
logging_suspended = 0;
@@ -233,30 +302,8 @@
rotate_logs_now(data);
}
if (!logging_suspended) {
- char *buf = NULL;
-
- switch (data->config->log_format)
- {
- case LF_RAW:
- buf = format_raw(&data->head->reply,
- data->config);
- break;
- case LF_NOLOG:
- return;
- default:
- audit_msg(LOG_ERR,
- "Illegal log format detected %d",
- data->config->log_format);
- break;
- }
- /* The only way buf is NULL is if there is an
- * unidentified format...which is impossible since
- * start up would have failed. */
- if (buf) {
- write_to_log(buf, data);
- buf[0] = 0;
- }
+ write_to_log(data->head->reply.msg.data, data);
/* See if we need to flush to disk manually */
if (data->config->flush == FT_INCREMENTAL) {
@@ -289,12 +336,32 @@
}
}
+static int ar_write (int sock, const void *buf, int len)
+{
+ int rc = 0, w;
+ while (len > 0) {
+ do {
+ w = write(sock, buf, len);
+ } while (w < 0 && errno == EINTR);
+ if (w < 0)
+ return w;
+ if (w == 0)
+ break;
+ rc += w;
+ len -= w;
+ buf = (const void *)((const char *)buf + w);
+ }
+ return rc;
+}
+
/* This function writes the given buf to the current log file */
static void write_to_log(const char *buf, struct auditd_consumer_data *data)
{
int rc;
FILE *f = data->log_file;
struct daemon_conf *config = data->config;
+ int ack_type = AUDIT_RMW_TYPE_ACK;
+ const char *msg = "";
/* write it to disk */
rc = fprintf(f, "%s\n", buf);
@@ -307,20 +374,35 @@
if (saved_errno == ENOSPC && fs_space_left == 1) {
fs_space_left = 0;
do_disk_full_action(config);
- } else
+ ack_type = AUDIT_RMW_TYPE_DISKFULL;
+ msg = "disk full";
+ } else {
do_disk_error_action("write", config);
+ ack_type = AUDIT_RMW_TYPE_DISKERROR;
+ msg = "disk write error";
+ }
+
+ } else {
- return;
+ /* check log file size & space left on partition */
+ if (config->daemonize == D_BACKGROUND) {
+ // If either of these fail, I consider it an inconvenience
+ // as opposed to something that is actionable. There may be
+ // some temporary condition that the system recovers from.
+ // The real error occurs on write.
+ check_log_file_size(data->log_fd, data);
+ check_space_left(data->log_fd, config);
+ }
}
- /* check log file size & space left on partition */
- if (config->daemonize == D_BACKGROUND) {
- // If either of these fail, I consider it an inconvenience
- // as opposed to something that is actionable. There may be
- // some temporary condition that the system recovers from.
- // The real error occurs on write.
- check_log_file_size(data->log_fd, data);
- check_space_left(data->log_fd, config);
+ if (data->head->ack_socket) {
+ unsigned char header[AUDIT_RMW_HEADER_SIZE];
+
+ AUDIT_RMW_PACK_HEADER (header, 0, ack_type, strlen(msg), data->head->sequence_id);
+
+ ar_write (data->head->ack_socket, header, AUDIT_RMW_HEADER_SIZE);
+ if (msg[0])
+ ar_write (data->head->ack_socket, msg, strlen(msg));
}
}
diff -N -U 3 -x .svn -r pristine/src/auditd-event.h trunk/src/auditd-event.h
--- pristine/src/auditd-event.h 2008-08-04 12:47:30.000000000 -0400
+++ trunk/src/auditd-event.h 2008-08-13 20:41:41.000000000 -0400
@@ -25,12 +25,21 @@
#define AUDITD_EVENT_H
#include "libaudit.h"
+
+struct auditd_reply_list {
+ struct audit_reply reply;
+ struct auditd_reply_list *next;
+ int ack_socket;
+ unsigned long sequence_id;
+};
+
#include "auditd-config.h"
void shutdown_events(void);
int init_event(struct daemon_conf *config);
void resume_logging(void);
void enqueue_event(struct auditd_reply_list *rep);
+void enqueue_formatted_event(char *msg, int ack_socket, uint32_t sequence_id);
void *consumer_thread_main(void *arg);
#endif
diff -N -U 3 -x .svn -r pristine/src/auditd-listen.c trunk/src/auditd-listen.c
--- pristine/src/auditd-listen.c 1969-12-31 19:00:00.000000000 -0500
+++ trunk/src/auditd-listen.c 2008-08-13 22:29:22.000000000 -0400
@@ -0,0 +1,335 @@
+/* auditd-listen.c --
+ * Copyright 2008 Red Hat Inc., Durham, North Carolina.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Authors:
+ * DJ Delorie <dj(a)redhat.com>
+ *
+ */
+
+#include "config.h"
+#include <stdio.h>
+#include <unistd.h>
+#include <sys/stat.h>
+#include <errno.h>
+#include <string.h>
+#include <dirent.h>
+#include <ctype.h>
+#include <stdlib.h>
+#include <netdb.h>
+#include <fcntl.h> /* O_NOFOLLOW needs gnu defined */
+#include <libgen.h>
+#include <arpa/inet.h>
+#include <limits.h> /* INT_MAX */
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <netinet/tcp.h>
+#include "libaudit.h"
+#include "auditd-event.h"
+#include "auditd-config.h"
+#include "private.h"
+
+#include "ev.h"
+
+extern volatile int stop;
+
+typedef struct ev_tcp {
+ struct ev_io io;
+ struct sockaddr_in addr;
+ struct ev_tcp *next, *prev;
+ int bufptr;
+ unsigned char buffer [MAX_AUDIT_MESSAGE_LENGTH + 17];
+} ev_tcp;
+
+static int listen_socket;
+static struct ev_io tcp_listen_watcher;
+static int min_port, max_port;
+
+static struct ev_tcp *client_chain = 0;
+
+static char *sockaddr_to_ip (struct sockaddr_in *addr)
+{
+ unsigned char *uaddr = (unsigned char *)&(addr->sin_addr);
+ static char buf[40];
+
+ sprintf (buf, "%d.%d.%d.%d:%d",
+ uaddr[0], uaddr[1], uaddr[2], uaddr[3], ntohs (addr->sin_port));
+ return buf;
+}
+
+static void set_close_on_exec (int fd)
+{
+ int flags = fcntl (fd, F_GETFD);
+ if (flags == -1)
+ flags = 0;
+ flags |= FD_CLOEXEC;
+ fcntl (fd, F_SETFD, flags);
+}
+
+static void close_client (struct ev_tcp *client)
+{
+ close (client->io.fd);
+ if (client_chain == client)
+ client_chain = client->next;
+ if (client->next)
+ client->next->prev = client->prev;
+ if (client->prev)
+ client->prev->next = client->next;
+ free (client);
+}
+
+static void client_message (struct ev_tcp *io, unsigned int length, unsigned char *header)
+{
+ unsigned char ch;
+ uint32_t magic, type, mlen, seq;
+ int hver, mver;
+ int i;
+
+ if (AUDIT_RMW_IS_MAGIC (header, length)) {
+ AUDIT_RMW_UNPACK_HEADER (header, hver, mver, type, mlen, seq)
+
+ ch = header[length];
+ header[length] = 0;
+ if (length > 1 && header[length-1] == '\n')
+ header[length-1] = 0;
+ enqueue_formatted_event (header+AUDIT_RMW_HEADER_SIZE, io->io.fd, seq);
+ header[length] = ch;
+ } else {
+ header[length] = 0;
+ if (length > 1 && header[length-1] == '\n')
+ header[length-1] = 0;
+ enqueue_formatted_event (header, 0, 0);
+ }
+}
+
+static void auditd_tcp_client_handler( struct ev_loop *loop, struct ev_io *_io, int revents )
+{
+ struct ev_tcp *io = (struct ev_tcp *) _io;
+ int i, r;
+ int total_this_call = 0;
+
+ /* The socket is non-blocking, but we have a limited buffer
+ size. In the event that we get a packet that's bigger than
+ our buffer, we need to read it in multiple parts. Thus, we
+ keep reading/parsing/processing until we run out of ready
+ data. */
+read_more:
+ r = read (io->io.fd,
+ io->buffer + io->bufptr,
+ MAX_AUDIT_MESSAGE_LENGTH - io->bufptr);
+
+ if (r < 0 && errno == EAGAIN)
+ r = 0;
+
+ /* We need to keep track of the difference between "no data
+ * because it's closed" and "no data because we've read it
+ * all". */
+ if (r == 0 && total_this_call > 0) {
+ return;
+ }
+
+ /* If the connection is gracefully closed, the first read we
+ try will return zero. If the connection times out or
+ otherwise fails, the read will return -1. */
+ if (r <= 0) {
+ if (r < 0)
+ audit_msg (LOG_WARNING, "client %s socket closed unexpectedly",
+ sockaddr_to_ip (&io->addr));
+
+ /* There may have been a final message without a LF. */
+ if (io->bufptr) {
+ client_message (io, io->bufptr, io->buffer);
+
+ }
+
+ ev_io_stop (loop, _io);
+ close_client (io);
+ return;
+ }
+
+ total_this_call += r;
+
+more_messages:
+ if (AUDIT_RMW_IS_MAGIC (io->buffer, io->bufptr+r)) {
+ uint32_t type, len, seq;
+ int hver, mver;
+ unsigned char *header = (unsigned char *)io->buffer;
+
+ io->bufptr += r;
+
+ if (io->bufptr < AUDIT_RMW_HEADER_SIZE)
+ return;
+
+ AUDIT_RMW_UNPACK_HEADER (header, hver, mver, type, len, seq);
+
+ i = len;
+ i += AUDIT_RMW_HEADER_SIZE;
+
+ /* See if we have enough bytes to extract the whole message. */
+ if (io->bufptr < i)
+ return;
+
+ } else {
+ /* At this point, the buffer has IO->BUFPTR+R bytes in it.
+ The first IO->BUFPTR bytes do not have a LF in them (we've
+ already checked), we must check the R new bytes. */
+
+ for (i = io->bufptr; i < io->bufptr + r; i ++)
+ if (io->buffer [i] == '\n')
+ break;
+
+ io->bufptr += r;
+
+ /* Check for a partial message, with no LF yet. */
+ if (i == io->bufptr)
+ return;
+
+ i ++;
+ }
+
+ /* We have an I-byte message in buffer. */
+ client_message (io, i, io->buffer);
+
+ /* Now copy any remaining bytes to the beginning of the
+ buffer. */
+ memmove (io->buffer, io->buffer + i, io->bufptr);
+ io->bufptr -= i;
+
+ /* See if this packet had more than one message in it. */
+ if (io->bufptr > 0) {
+ r = io->bufptr;
+ io->bufptr = 0;
+ goto more_messages;
+ }
+
+ /* Go back and see if there's more data to read. */
+ goto read_more;
+}
+
+static void auditd_tcp_listen_handler( struct ev_loop *loop, struct ev_io *_io, int revents )
+{
+ int one=1;
+ int afd;
+ socklen_t aaddrlen;
+ struct sockaddr_in aaddr;
+ struct linger li;
+ struct ev_tcp *client;
+ unsigned char *uaddr;
+
+ /* Accept the connection and see where it's coming from. */
+ aaddrlen = sizeof(aaddr);
+ afd = accept (listen_socket, (struct sockaddr *)&aaddr, &aaddrlen);
+ if (afd == -1) {
+ audit_msg(LOG_ERR, "Unable to accept TCP connection");
+ return;
+ }
+
+ uaddr = (unsigned char *)&aaddr.sin_addr;
+
+ /* Verify it's coming from an authorized port. We assume the firewall will
+ block attempts from unauthorized machines. */
+ if (min_port > ntohs (aaddr.sin_port) || ntohs (aaddr.sin_port) > max_port) {
+ audit_msg(LOG_ERR, "TCP connection from %s rejected", sockaddr_to_ip (&aaddr));
+ close (afd);
+ return;
+ }
+
+ setsockopt(afd, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof (int));
+ setsockopt(afd, SOL_SOCKET, SO_KEEPALIVE, (char *)&one, sizeof (int));
+ setsockopt(afd, IPPROTO_TCP, TCP_NODELAY, (char *)&one, sizeof (int));
+ fcntl(afd, F_SETFL, O_NONBLOCK | O_NDELAY);
+ set_close_on_exec (afd);
+
+ client = (struct ev_tcp *) malloc (sizeof (struct ev_tcp));
+ if (client == NULL) {
+ audit_msg(LOG_CRIT, "Unable to allocate TCP client data");
+ close (afd);
+ return;
+ }
+
+ memset (client, 0, sizeof (struct ev_tcp));
+
+ ev_io_init (&(client->io), auditd_tcp_client_handler, afd, EV_READ | EV_ERROR);
+ ev_io_start (loop, &(client->io));
+
+ memcpy (&client->addr, &aaddr, sizeof (struct sockaddr_in));
+
+ /* Keep a linked list of active clients. */
+ client->next = client_chain;
+ if (client->next)
+ client->next->prev = client;
+ client_chain = client;
+}
+
+int auditd_tcp_listen_init ( struct ev_loop *loop, struct daemon_conf *config )
+{
+ struct sockaddr_in address;
+ int one = 1;
+ int flags;
+
+ /* If the port is not set, that means we aren't going to
+ listen for connections. */
+ if (config->tcp_listen_port == 0)
+ return;
+
+ listen_socket = socket (AF_INET, SOCK_STREAM, 0);
+ if (listen_socket == 0) {
+ audit_msg(LOG_ERR, "Cannot create tcp listener socket");
+ return 1;
+ }
+
+ set_close_on_exec (listen_socket);
+ setsockopt(listen_socket, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof (int));
+
+ memset (&address, 0, sizeof(address));
+ address.sin_family = htons(AF_INET);
+ address.sin_port = htons(config->tcp_listen_port);
+ address.sin_addr.s_addr = htonl(INADDR_ANY);
+
+ /* This avoids problems if auditd needs to be restarted. */
+ setsockopt(listen_socket, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof (int));
+
+ if ( bind ( listen_socket, (struct sockaddr *)&address, sizeof(address)) ) {
+ audit_msg(LOG_ERR, "Cannot bind tcp listener socket to port %d",
+ config->tcp_listen_port);
+ close(listen_socket);
+ return 1;
+ }
+
+ listen(listen_socket, config->tcp_listen_queue);
+
+ audit_msg(LOG_DEBUG, "Listening on TCP port %d", config->tcp_listen_port);
+
+ ev_io_init (&tcp_listen_watcher, auditd_tcp_listen_handler, listen_socket, EV_READ);
+ ev_io_start (loop, &tcp_listen_watcher);
+
+ min_port = config->tcp_client_min_port;
+ max_port = config->tcp_client_max_port;
+
+ return 0;
+}
+
+void auditd_tcp_listen_uninit ( struct ev_loop *loop )
+{
+ ev_io_stop ( loop, &tcp_listen_watcher );
+ close ( listen_socket );
+
+ while (client_chain) {
+ close_client (client_chain);
+ }
+}
diff -N -U 3 -x .svn -r pristine/src/auditd-listen.h trunk/src/auditd-listen.h
--- pristine/src/auditd-listen.h 1969-12-31 19:00:00.000000000 -0500
+++ trunk/src/auditd-listen.h 2008-08-08 17:01:37.000000000 -0400
@@ -0,0 +1,30 @@
+/* auditd-config.h --
+ * Copyright 2004-2007 Red Hat Inc., Durham, North Carolina.
+ * All Rights Reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
+ *
+ * Authors:
+ * DJ Delorie <dj(a)redhat.com>
+ *
+ */
+
+#ifndef AUDITD_LISTEN_H
+#define AUDITD_LISTEN_H
+
+int auditd_tcp_listen_init ( struct ev_loop *loop, struct daemon_conf *config );
+void auditd_tcp_listen_uninit ( struct ev_loop *loop );
+
+#endif
diff -N -U 3 -x .svn -r pristine/src/auditd-reconfig.c trunk/src/auditd-reconfig.c
--- pristine/src/auditd-reconfig.c 2008-08-04 12:47:30.000000000 -0400
+++ trunk/src/auditd-reconfig.c 2008-08-12 18:54:20.000000000 -0400
@@ -28,9 +28,9 @@
#include <unistd.h>
#include <string.h>
#include <stdio.h>
-#include "auditd-config.h"
-#include "auditd-event.h"
#include "libaudit.h"
+#include "auditd-event.h"
+#include "auditd-config.h"
#include "private.h"
/* This is the configuration manager code */
diff -N -U 3 -x .svn -r pristine/src/auditd.c trunk/src/auditd.c
--- pristine/src/auditd.c 2008-08-08 14:36:19.000000000 -0400
+++ trunk/src/auditd.c 2008-08-13 20:51:35.000000000 -0400
@@ -40,8 +40,8 @@
#include <getopt.h>
#include "libaudit.h"
-#include "auditd-config.h"
#include "auditd-event.h"
+#include "auditd-config.h"
#include "auditd-dispatch.h"
#include "private.h"
@@ -670,7 +670,15 @@
ev_signal_init (&sigchld_watcher, child_handler, SIGCHLD);
ev_signal_start (loop, &sigchld_watcher);
- ev_loop (loop, 0);
+ if (auditd_tcp_listen_init (loop, &config)) {
+ tell_parent (FAILURE);
+ stop = 1;
+ }
+
+ if (!stop)
+ ev_loop (loop, 0);
+
+ auditd_tcp_listen_uninit (loop);
/* Write message to log that we are going down */
15 years, 1 month
- 5
- 24
[PATCH] Handle timestamp 0.0 in auparse, was Re: audit-viewer help needed
by Miloslav Trmač
Hello,
the attached patch modifies auparse not to handle timestamp 0.x
specially by using out-of-band information (parse_state == EVENT_EMPTY)
instead of assuming (au->le.e.sec == 0) has a special meaning. As far
as I can see, this the two conditions are equivalent if no event has a
timestamp 0.x.
The patch also decreases the assumed minimal length of a timestamp.
I have tested this only minimally - I have checked that (make check)
succeeds, and that audit-viewer doesn't crash on startup.
This patch fixes handling of the following Lenny's audit record:
> node=hugo type=AVC msg=audit(0.000:6760): avc: denied { recvfrom }
> for pid=2589 comm="lockd" saddr=127.0.0.1 src=687 daddr=127.0.0.1
> dest=111 netif=lo scontext=system_u:system_r:initrc_t:s0-s15:c0.c1023
> tcontext=system_u:system_r:kernel_t:s15:c0.c1023 tclass=association
I'm curious how this audit record could have been created (notabile is
that the previous record has a sequence ID 6758 and a reasonable
timestamp). Lenny, Steve, any ideas?
Thank you,
Mirek
15 years, 10 months
- 4
- 7
[PATCH] Add error-handling actions to audisp-remote
by DJ Delorie
Third in a series.
(http://www.redhat.com/archives/linux-audit/2008-August/msg00118.html)
The goal of this patch is to robustify the error handling in the
client end of the remote protocol. The following changes are made
by this patch:
* Failure to send a record to the aggregator results in a series of
retry attempts, tunable by the administrator.
* Overall network failure (after retries) and server-indicated error
conditions now have admin-specified actions associated with them.
* Miscellaneous additional error handling for reads and writes.
Comments?
DJ
diff -x .svn -U 3 -r pristine/audisp/plugins/remote/audisp-remote.c trunk/audisp/plugins/remote/audisp-remote.c
--- pristine/audisp/plugins/remote/audisp-remote.c 2008-08-27 18:55:41.000000000 -0400
+++ trunk/audisp/plugins/remote/audisp-remote.c 2008-08-28 14:15:42.000000000 -0400
@@ -40,15 +40,27 @@
#define CONFIG_FILE "/etc/audisp/audisp-remote.conf"
#define BUF_SIZE 32
+/* Error types */
+#define ET_SUCCESS 0
+#define ET_PERMANENT -1
+#define ET_TEMPORARY -2
+
/* Global Data */
static volatile int stop = 0;
static volatile int hup = 0;
+static volatile int suspend = 0;
static remote_conf_t config;
static int sock=-1;
+static const char *SINGLE = "1";
+static const char *HALT = "0";
+
+static int transport_ok = 0;
+
/* Local function declarations */
static int relay_event(const char *s, size_t len);
static int init_transport(void);
+static int stop_transport(void);
/*
@@ -69,10 +81,19 @@
static void reload_config(void)
{
+ stop_transport ();
hup = 0;
}
/*
+ * SIGSUR2 handler: resume logging
+ */
+static void user2_handler( int sig )
+{
+ suspend = 0;
+}
+
+/*
* Handlers for various events coming back from the remote server.
* Return -1 if the remote dispatcher should exit.
*/
@@ -81,45 +102,135 @@
static int sync_error_handler (const char *why)
{
/* "why" has human-readable details on why we've lost (or will
- be losing) sync. */
- syslog (LOG_ERR, "lost/losing sync, %s", why);
- return -1;
+ be losing) sync. Sync errors are transient - if a retry
+ doesn't fix it, we eventually call network_failure_handler
+ which has all the user-tweakable actions. */
+ if (config.network_failure_action == FA_SYSLOG)
+ syslog (LOG_ERR, "lost/losing sync, %s", why);
+ return 0;
+}
+
+static void change_runlevel(const char *level)
+{
+ char *argv[3];
+ int pid;
+ static const char *init_pgm = "/sbin/init";
+
+ pid = fork();
+ if (pid < 0) {
+ syslog(LOG_ALERT,
+ "Audit daemon failed to fork switching runlevels");
+ return;
+ }
+ if (pid) /* Parent */
+ return;
+ /* Child */
+ argv[0] = (char *)init_pgm;
+ argv[1] = (char *)level;
+ argv[2] = NULL;
+ execve(init_pgm, argv, NULL);
+ syslog(LOG_ALERT, "Audit daemon failed to exec %s", init_pgm);
+ exit(1);
+}
+
+static void safe_exec(const char *exe, const char *message)
+{
+ char *argv[3];
+ int pid;
+
+ pid = fork();
+ if (pid < 0) {
+ syslog(LOG_ALERT,
+ "Audit daemon failed to fork doing safe_exec");
+ return;
+ }
+ if (pid) /* Parent */
+ return;
+ /* Child */
+ argv[0] = (char *)exe;
+ argv[1] = (char *)message;
+ argv[2] = NULL;
+ execve(exe, argv, NULL);
+ syslog(LOG_ALERT, "Audit daemon failed to exec %s", exe);
+ exit(1);
+}
+
+static int do_action (const char *desc, const char *message,
+ int log_level,
+ failure_action_t action, const char *exe)
+{
+ switch (action)
+ {
+ case FA_IGNORE:
+ return 0;
+ case FA_SYSLOG:
+ syslog (log_level, "%s, %s", desc, message);
+ return 0;
+ case FA_EXEC:
+ safe_exec (exe, message);
+ return 0;
+ case FA_SUSPEND:
+ suspend = 1;
+ return 0;
+ case FA_SINGLE:
+ change_runlevel(SINGLE);
+ return 1;
+ case FA_HALT:
+ change_runlevel(HALT);
+ return 1;
+ case FA_STOP:
+ syslog (log_level, "stopping due to %s, %s", desc, message);
+ stop = 1;
+ return 1;
+ }
+}
+
+static int network_failure_handler (const char *message)
+{
+ return do_action ("network failure", message,
+ LOG_WARNING,
+ config.network_failure_action, config.network_failure_exe);
}
static int remote_disk_low_handler (const char *message)
{
- syslog (LOG_WARNING, "remote disk low, %s", message);
- return 0;
+ return do_action ("remote disk low", message,
+ LOG_WARNING,
+ config.disk_low_action, config.disk_low_exe);
}
static int remote_disk_full_handler (const char *message)
{
- syslog (LOG_ERR, "remote disk full, %s", message);
- return -1;
+ return do_action ("remote disk full", message,
+ LOG_ERR,
+ config.disk_full_action, config.disk_full_exe);
}
static int remote_disk_error_handler (const char *message)
{
- syslog (LOG_ERR, "remote disk error, %s", message);
- return -1;
+ return do_action ("remote disk error", message,
+ LOG_ERR,
+ config.disk_error_action, config.disk_error_exe);
}
static int remote_server_ending_handler (const char *message)
{
- syslog (LOG_INFO, "remote server ending, %s", message);
- return -1;
+ return do_action ("remote server ending", message,
+ LOG_INFO,
+ config.remote_ending_action, config.remote_ending_exe);
}
static int generic_remote_error_handler (const char *message)
{
- stop = 1;
- syslog(LOG_INFO, "audisp-remote: remote error: %s", message);
- return -1;
+ return do_action ("unrecognized remote error", message,
+ LOG_ERR,
+ config.generic_error_action, config.generic_error_exe);
}
static int generic_remote_warning_handler (const char *message)
{
- syslog(LOG_INFO, "audisp-remote: remote warning: %s", message);
- return 0;
+ return do_action ("unrecognized remote warning", message,
+ LOG_WARNING,
+ config.generic_warning_action, config.generic_warning_exe);
}
@@ -137,11 +248,16 @@
sigaction(SIGTERM, &sa, NULL);
sa.sa_handler = hup_handler;
sigaction(SIGHUP, &sa, NULL);
+ sa.sa_handler = user2_handler;
+ sigaction(SIGUSR2, &sa, NULL);
if (load_config(&config, CONFIG_FILE))
return 6;
+ /* We fail here if the transport can't be initialized because
+ * of some permenent (i.e. operator) problem, such as
+ * misspelled host name. */
rc = init_transport();
- if (rc < 0)
+ if (rc == ET_PERMANENT)
return 1;
syslog(LOG_INFO, "audisp-remote is ready for events");
@@ -155,10 +271,12 @@
/* Now the event loop */
while (fgets_unlocked(tmp, MAX_AUDIT_MESSAGE_LENGTH, stdin) &&
hup==0 && stop==0) {
- rc = relay_event(tmp, strnlen(tmp,
- MAX_AUDIT_MESSAGE_LENGTH));
- if (rc < 0) {
- break;
+ if (!suspend) {
+ rc = relay_event(tmp, strnlen(tmp,
+ MAX_AUDIT_MESSAGE_LENGTH));
+ if (rc < 0) {
+ break;
+ }
}
}
if (feof(stdin))
@@ -186,14 +304,14 @@
if (rc) {
syslog(LOG_ERR, "Error looking up remote host: %s - exiting",
gai_strerror(rc));
- return -1;
+ return ET_PERMANENT;
}
sock = socket(ai->ai_family, ai->ai_socktype, ai->ai_protocol);
if (sock < 0) {
syslog(LOG_ERR, "Error creating socket: %s - exiting",
strerror(errno));
freeaddrinfo(ai);
- return -1;
+ return ET_TEMPORARY;
}
setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (char *)&one, sizeof (int));
@@ -210,7 +328,7 @@
syslog(LOG_ERR, "Cannot bind local socket to port %d - exiting",
config.local_port);
close(sock);
- return -1;
+ return ET_TEMPORARY;
}
}
@@ -218,14 +336,22 @@
syslog(LOG_ERR, "Error connecting to %s: %s - exiting",
config.remote_server, strerror(errno));
freeaddrinfo(ai);
- return -1;
+ return ET_TEMPORARY;
}
setsockopt(sock, SOL_SOCKET, SO_KEEPALIVE, (char *)&one, sizeof (int));
- setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (char *)&one, sizeof (int));
+
+ /* The idea here is to minimize the time between the message
+ and the ACK, assuming that individual messages are
+ infrequent enough that we can ignore the inefficiency of
+ sending the header and message in separate packets. */
+ if (config.format == F_MANAGED)
+ setsockopt(sock, IPPROTO_TCP, TCP_NODELAY, (char *)&one, sizeof (int));
+
+ transport_ok = 1;
freeaddrinfo(ai);
- return 0;
+ return ET_SUCCESS;
}
static int init_transport(void)
@@ -238,6 +364,28 @@
rc = init_sock();
break;
default:
+ rc = ET_PERMANENT;
+ break;
+ }
+ return rc;
+}
+
+static int stop_sock(void)
+{
+ close (sock);
+ transport_ok = 0;
+}
+
+static int stop_transport(void)
+{
+ int rc;
+
+ switch (config.transport)
+ {
+ case T_TCP:
+ rc = stop_sock();
+ break;
+ default:
rc = -1;
break;
}
@@ -246,10 +394,19 @@
static int ar_write (int sock, const void *buf, int len)
{
- int rc;
- do {
- rc = write(sock, buf, len);
- } while (rc < 0 && errno == EINTR);
+ int rc = 0, r;
+ while (len > 0) {
+ do {
+ r = write(sock, buf, len);
+ } while (r < 0 && errno == EINTR);
+ if (r < 0)
+ return r;
+ if (r == 0)
+ break;
+ rc += r;
+ buf = (void *)((char *)buf + r);
+ len -= r;
+ }
return rc;
}
@@ -275,6 +432,10 @@
{
int rc;
+ if (!transport_ok)
+ if (init_transport ())
+ return -1;
+
rc = ar_write(sock, s, len);
if (rc <= 0) {
stop = 1;
@@ -294,53 +455,103 @@
int hver, mver;
uint32_t type, rlen, seq;
char msg[MAX_AUDIT_MESSAGE_LENGTH+1];
+ int n_tries_this_message = 0;
+ time_t now, then;
sequence_id ++;
+
+ time (&then);
+try_again:
+ time (&now);
+
+ /* We want the first retry to be quick, in case the network
+ failed for some fail-once reason. In this case, it goes
+ "failure - reconnect - send". Only if this quick retry
+ fails do we start pausing between retries to prevent
+ swamping the local computer and the network. */
+ if (n_tries_this_message > 1)
+ sleep (config.network_retry_time);
+
+ if (n_tries_this_message > config.max_tries_per_record) {
+ network_failure_handler ("max retries exhausted");
+ return -1;
+ }
+ if ((now - then) > config.max_time_per_record) {
+ network_failure_handler ("max retry time exhausted");
+ return -1;
+ }
+
+ n_tries_this_message ++;
+
+ if (!transport_ok) {
+ if (init_transport ())
+ goto try_again;
+ }
+
AUDIT_RMW_PACK_HEADER (header, 0, 0, len, sequence_id);
rc = ar_write(sock, header, AUDIT_RMW_HEADER_SIZE);
if (rc <= 0) {
- stop = 1;
- syslog(LOG_ERR, "connection to %s closed unexpectedly - exiting",
- config.remote_server);
- return -1;
+ if (config.network_failure_action == FA_SYSLOG)
+ syslog(LOG_ERR, "connection to %s closed unexpectedly",
+ config.remote_server);
+ stop_transport();
+ goto try_again;
}
rc = ar_write(sock, s, len);
if (rc <= 0) {
- stop = 1;
- syslog(LOG_ERR, "connection to %s closed unexpectedly - exiting",
- config.remote_server);
- return -1;
+ if (config.network_failure_action == FA_SYSLOG)
+ syslog(LOG_ERR, "connection to %s closed unexpectedly",
+ config.remote_server);
+ stop_transport();
+ goto try_again;
}
rc = ar_read (sock, header, AUDIT_RMW_HEADER_SIZE);
if (rc < 16) {
- stop = 1;
- syslog(LOG_ERR, "connection to %s closed unexpectedly - exiting",
- config.remote_server);
- return -1;
+ if (config.network_failure_action == FA_SYSLOG)
+ syslog(LOG_ERR, "connection to %s closed unexpectedly",
+ config.remote_server);
+ stop_transport();
+ goto try_again;
}
- if (! AUDIT_RMW_IS_MAGIC (header, AUDIT_RMW_HEADER_SIZE))
+ if (! AUDIT_RMW_IS_MAGIC (header, AUDIT_RMW_HEADER_SIZE)) {
/* FIXME: the right thing to do here is close the socket and start a new one. */
- return sync_error_handler ("bad magic number");
+ if (sync_error_handler ("bad magic number"))
+ return -1;
+ stop_transport();
+ goto try_again;
+ }
AUDIT_RMW_UNPACK_HEADER (header, hver, mver, type, rlen, seq);
- if (rlen > MAX_AUDIT_MESSAGE_LENGTH)
- return sync_error_handler ("message too long");
+ if (rlen > MAX_AUDIT_MESSAGE_LENGTH) {
+ if (sync_error_handler ("message too long"))
+ return -1;
+ stop_transport();
+ goto try_again;
+ }
if (rlen > 0
- && ar_read (sock, msg, rlen) < rlen)
- return sync_error_handler ("ran out of data reading reply");
+ && ar_read (sock, msg, rlen) < rlen) {
+ if (sync_error_handler ("ran out of data reading reply"))
+ return -1;
+ stop_transport();
+ goto try_again;
+ }
msg[rlen] = 0;
- if (seq != sequence_id)
+ if (seq != sequence_id) {
/* FIXME: should we read another header and
see if it matches? If so, we need to deal
with timeouts. */
- return sync_error_handler ("mismatched response");
+ if (sync_error_handler ("mismatched response"))
+ return -1;
+ stop_transport();
+ goto try_again;
+ }
/* Specific errors we know how to deal with. */
diff -x .svn -U 3 -r pristine/audisp/plugins/remote/audisp-remote.conf trunk/audisp/plugins/remote/audisp-remote.conf
--- pristine/audisp/plugins/remote/audisp-remote.conf 2008-08-15 15:52:05.000000000 -0400
+++ trunk/audisp/plugins/remote/audisp-remote.conf 2008-08-28 14:34:48.000000000 -0400
@@ -9,5 +9,15 @@
transport = tcp
mode = immediate
queue_depth = 20
-fail_action = SYSLOG
format = managed
+network_retry_time = 1
+max_tries_per_record = 3
+max_time_per_record = 5
+
+network_failure_action = stop
+disk_low_action = ignore
+disk_full_action = ignore
+disk_error_action = syslog
+remote_ending_action = suspend
+generic_error_action = syslog
+generic_warning_action = syslog
diff -x .svn -U 3 -r pristine/audisp/plugins/remote/audisp-remote.conf.5 trunk/audisp/plugins/remote/audisp-remote.conf.5
--- pristine/audisp/plugins/remote/audisp-remote.conf.5 2008-08-15 15:52:05.000000000 -0400
+++ trunk/audisp/plugins/remote/audisp-remote.conf.5 2008-08-28 11:45:55.000000000 -0400
@@ -45,24 +45,52 @@
.I mode
option. The default depth is 20.
.TP
-.I fail_action
+.I network_failure_action
This parameter tells the system what action to take whenever there is an error
-detected when sending audit events to the remote system, or if the remote system reports an error. Valid values are
-.IR ignore ", " syslog ", " exec ", " suspend ", " single ", and " halt .
+detected when sending audit events to the remote system. Valid values are
+.IR ignore ", " syslog ", " exec ", " suspend ", " single ", " halt ", and " stop .
If set to
.IR ignore ,
the audit daemon does nothing.
.I Syslog
-means that it will issue a warning to syslog.
+means that it will issue a warning to syslog. This is the default.
.I exec
/path-to-script will execute the script. You cannot pass parameters to the script.
.I Suspend
will cause the remote logging app to stop sending records to the remote system. The logging app will still be alive. The
.I single
-option will cause the remote logging app to put the computer system in single user mode.
+option will cause the remote logging app to put the computer system in single user mode. The
+.I stop
+option will cause the remote logging app to exit, but leave other plugins running. The
.I halt
option will cause the remote logging app to shutdown the computer system.
.TP
+.I disk_low_action
+Likewise, this parameter tells the system what action to take if the
+remote end signals a disk low error. The default is to ignore it.
+.TP
+.I disk_full_action
+Likewise, this parameter tells the system what action to take if the
+remote end signals a disk full error. The default is to ignore it.
+.TP
+.I disk_error_action
+Likewise, this parameter tells the system what action to take if the
+remote end signals a disk error. The default is to log it to syslog.
+.TP
+.I remote_ending_action
+Likewise, this parameter tells the system what action to take if the
+remote end signals a disk error. The default is to suspend logging.
+.TP
+.I generic_error_action
+Likewise, this parameter tells the system what action to take if the
+remote end signals an error we don't recognize. The default is to log
+it to syslog.
+.TP
+.I generic_warning_action
+Likewise, this parameter tells the system what action to take if the
+remote end signals a warning we don't recognize. The default is to
+log it to syslog.
+.TP
.I format
This parameter tells the remote logging app what data format will be
used for the messages sent over the network. The default is
@@ -73,11 +101,43 @@
.I ascii
is given instead, each message is a simple ASCII text line with no
overhead at all.
+.TP
+.I network_retry_time
+The time, in seconds, between retries when a network error is
+detected. Note that this pause applies starting after the second
+attempt, so as to avoid unneeded delays if a reconnect is sufficient
+to fix the problem. The default is 1 second.
+.TP
+.I max_tries_per_record
+The maximum number of times an attempt is made to deliver each
+message. The minimum value is one, as even a completely successful
+delivery requires at least one try. If too many attempts are made,
+the network_failure_action action is performed. The default is 3.
+.TP
+.I max_time_per_record
+The maximum amount of time, in seconds, spent attempting to deliver
+each message. Note that both this and
+.I max_tries_per_record
+should be set, as each try may take a long time to time out. The
+default value is 5 seconds. If too much time is used on a message,
+the network_failure_action action is performed.
.SH "NOTES"
Specifying a local port may make it difficult to restart the audit
subsystem due to the previous connection being in a TIME_WAIT state,
if you're reconnecting to and from the same hosts and ports as before.
+
+The network failure logic works as follows: The first attempt to
+deliver normally "just works". If it doesn't, a second attempt is
+immediately made, perhaps after reconnecting to the server. If
+the second attempt also fails,
+.I audispd-remote
+pauses for the configured time and tries again. It continues to pause
+and retry until either too many attempts have been made or the allowed
+time expires. Note that these times govern the maximum amount of time
+the remote server is allowed in order to reboot, if you want to
+maintain logging across a reboot.
+
.SH "SEE ALSO"
.BR audispd (8),
.BR audisp-remote(8).
diff -x .svn -U 3 -r pristine/audisp/plugins/remote/remote-config.c trunk/audisp/plugins/remote/remote-config.c
--- pristine/audisp/plugins/remote/remote-config.c 2008-08-15 15:52:05.000000000 -0400
+++ trunk/audisp/plugins/remote/remote-config.c 2008-08-28 11:45:38.000000000 -0400
@@ -74,6 +74,22 @@
remote_conf_t *config);
static int format_parser(struct nv_pair *nv, int line,
remote_conf_t *config);
+static int network_retry_time_parser(struct nv_pair *nv, int line,
+ remote_conf_t *config);
+static int max_tries_per_record_parser(struct nv_pair *nv, int line,
+ remote_conf_t *config);
+static int max_time_per_record_parser(struct nv_pair *nv, int line,
+ remote_conf_t *config);
+#define AP(x) static int x##_action_parser(struct nv_pair *nv, int line, \
+ remote_conf_t *config);
+AP(network_failure)
+AP(disk_low)
+AP(disk_full)
+AP(disk_error)
+AP(remote_ending)
+AP(generic_error)
+AP(generic_warning)
+#undef AP
static int sanity_check(remote_conf_t *config, const char *file);
static const struct kw_pair keywords[] =
@@ -84,8 +100,17 @@
{"transport", transport_parser, 0 },
{"mode", mode_parser, 0 },
{"queue_depth", depth_parser, 0 },
- {"fail_action", fail_action_parser, 0 },
{"format", format_parser, 0 },
+ {"network_retry_time", network_retry_time_parser, 0 },
+ {"max_tries_per_record", max_tries_per_record_parser, 0 },
+ {"max_time_per_record", max_time_per_record_parser, 0 },
+ {"network_failure_action", network_failure_action_parser, 0 },
+ {"disk_low_action", disk_low_action_parser, 0 },
+ {"disk_full_action", disk_full_action_parser, 0 },
+ {"disk_error_action", disk_error_action_parser, 0 },
+ {"remote_ending_action", remote_ending_action_parser, 0 },
+ {"generic_error_action", generic_error_action_parser, 0 },
+ {"generic_warning_action", generic_warning_action_parser, 0 },
{ NULL, NULL }
};
@@ -104,12 +129,13 @@
static const struct nv_list fail_action_words[] =
{
- {"ignore", F_IGNORE },
- {"syslog", F_SYSLOG },
- {"exec", F_EXEC },
- {"suspend", F_SUSPEND },
- {"single", F_SINGLE },
- {"halt", F_HALT },
+ {"ignore", FA_IGNORE },
+ {"syslog", FA_SYSLOG },
+ {"exec", FA_EXEC },
+ {"suspend", FA_SUSPEND },
+ {"single", FA_SINGLE },
+ {"halt", FA_HALT },
+ {"stop", FA_STOP },
{ NULL, 0 }
};
@@ -131,9 +157,21 @@
config->port = T_TCP;
config->mode = M_IMMEDIATE;
config->queue_depth = 20;
- config->fail_action = F_SYSLOG;
- config->fail_exe = NULL;
config->format = F_MANAGED;
+
+ config->network_retry_time = 1;
+ config->max_tries_per_record = 3;
+ config->max_time_per_record = 5;
+
+#define IA(x,f) config->x##_action = f; config->x##_exe = NULL
+ IA(network_failure, FA_STOP);
+ IA(disk_low, FA_IGNORE);
+ IA(disk_full, FA_IGNORE);
+ IA(disk_error, FA_SYSLOG);
+ IA(remote_ending, FA_SUSPEND);
+ IA(generic_error, FA_SYSLOG);
+ IA(generic_warning, FA_SYSLOG);
+#undef IA
}
int load_config(remote_conf_t *config, const char *file)
@@ -372,10 +410,10 @@
return 0;
}
-static int port_parser(struct nv_pair *nv, int line, remote_conf_t *config)
+static int parse_uint (struct nv_pair *nv, int line, unsigned int *valp, unsigned int min, unsigned int max)
{
const char *ptr = nv->value;
- int i;
+ unsigned int i;
/* check that all chars are numbers */
for (i=0; ptr[i]; i++) {
@@ -397,56 +435,32 @@
return 1;
}
/* Check its range */
- if (i > INT_MAX) {
+ if (min != 0 && i < (int)min) {
syslog(LOG_ERR,
- "Error - converted number (%s) is too large - line %d",
+ "Error - converted number (%s) is too small - line %d",
nv->value, line);
return 1;
}
- config->port = (unsigned int)i;
- return 0;
-}
-
-static int local_port_parser(struct nv_pair *nv, int line, remote_conf_t *config)
-{
- const char *ptr = nv->value;
- int i;
-
- if (strcasecmp (ptr, "any") == 0) {
- config->local_port = 0;
- return 0;
- }
-
- /* check that all chars are numbers */
- for (i=0; ptr[i]; i++) {
- if (!isdigit(ptr[i])) {
- syslog(LOG_ERR,
- "Value %s should only be numbers - line %d",
- nv->value, line);
- return 1;
- }
- }
-
- /* convert to unsigned int */
- errno = 0;
- i = strtoul(nv->value, NULL, 10);
- if (errno) {
- syslog(LOG_ERR,
- "Error converting string to a number (%s) - line %d",
- strerror(errno), line);
- return 1;
- }
- /* Check its range */
- if (i > INT_MAX) {
+ if (max != 0 && i > max) {
syslog(LOG_ERR,
"Error - converted number (%s) is too large - line %d",
nv->value, line);
return 1;
}
- config->local_port = (unsigned int)i;
+ *valp = (unsigned int)i;
return 0;
}
+static int port_parser(struct nv_pair *nv, int line, remote_conf_t *config)
+{
+ return parse_uint (nv, line, &(config->port), 0, INT_MAX);
+}
+
+static int local_port_parser(struct nv_pair *nv, int line, remote_conf_t *config)
+{
+ return parse_uint (nv, line, &(config->local_port), 0, INT_MAX);
+}
+
static int transport_parser(struct nv_pair *nv, int line, remote_conf_t *config)
{
int i;
@@ -476,54 +490,24 @@
static int depth_parser(struct nv_pair *nv, int line,
remote_conf_t *config)
{
- const char *ptr = nv->value;
- int i;
-
- /* check that all chars are numbers */
- for (i=0; ptr[i]; i++) {
- if (!isdigit(ptr[i])) {
- syslog(LOG_ERR,
- "Value %s should only be numbers - line %d",
- nv->value, line);
- return 1;
- }
- }
-
- /* convert to unsigned int */
- errno = 0;
- i = strtoul(nv->value, NULL, 10);
- if (errno) {
- syslog(LOG_ERR,
- "Error converting string to a number (%s) - line %d",
- strerror(errno), line);
- return 1;
- }
- /* Check its range */
- if (i > INT_MAX) {
- syslog(LOG_ERR,
- "Error - converted number (%s) is too large - line %d",
- nv->value, line);
- return 1;
- }
- config->queue_depth = (unsigned int)i;
- return 0;
+ return parse_uint (nv, line, &(config->queue_depth), 1, INT_MAX);
}
-static int fail_action_parser(struct nv_pair *nv, int line,
- remote_conf_t *config)
+static int action_parser(struct nv_pair *nv, int line,
+ failure_action_t *actp, const char **exep)
{
int i;
for (i=0; fail_action_words[i].name != NULL; i++) {
if (strcasecmp(nv->value, fail_action_words[i].name) == 0) {
- config->fail_action = fail_action_words[i].option;
+ *actp = fail_action_words[i].option;
return 0;
- } else if (i == F_EXEC) {
+ } else if (i == FA_EXEC) {
if (strncasecmp(fail_action_words[i].name,
nv->value, 4) == 0){
if (check_exe_name(nv->option))
return 1;
- config->fail_exe = strdup(nv->option);
- config->fail_action = F_EXEC;
+ *exep = strdup(nv->option);
+ *actp = FA_EXEC;
return 0;
}
}
@@ -532,6 +516,22 @@
return 1;
}
+#define AP(x) \
+static int x##_action_parser(struct nv_pair *nv, int line, \
+ remote_conf_t *config) \
+{ \
+ return action_parser (nv, line, &(config->x##_action), &(config->x##_exe)); \
+} \
+
+AP(network_failure)
+AP(disk_low)
+AP(disk_full)
+AP(disk_error)
+AP(remote_ending)
+AP(generic_error)
+AP(generic_warning)
+#undef AP
+
static int format_parser(struct nv_pair *nv, int line,
remote_conf_t *config)
{
@@ -546,6 +546,24 @@
return 1;
}
+static int network_retry_time_parser(struct nv_pair *nv, int line,
+ remote_conf_t *config)
+{
+ return parse_uint (nv, line, &(config->network_retry_time), 1, INT_MAX);
+}
+
+static int max_tries_per_record_parser(struct nv_pair *nv, int line,
+ remote_conf_t *config)
+{
+ return parse_uint (nv, line, &(config->max_tries_per_record), 1, INT_MAX);
+}
+
+static int max_time_per_record_parser(struct nv_pair *nv, int line,
+ remote_conf_t *config)
+{
+ return parse_uint (nv, line, &(config->max_time_per_record), 1, INT_MAX);
+}
+
/*
* This function is where we do the integrated check of the audispd config
* options. At this point, all fields have been read. Returns 0 if no
diff -x .svn -U 3 -r pristine/audisp/plugins/remote/remote-config.h trunk/audisp/plugins/remote/remote-config.h
--- pristine/audisp/plugins/remote/remote-config.h 2008-08-15 15:52:05.000000000 -0400
+++ trunk/audisp/plugins/remote/remote-config.h 2008-08-28 14:18:18.000000000 -0400
@@ -26,8 +26,9 @@
typedef enum { M_IMMEDIATE, M_STORE_AND_FORWARD } mode_t;
typedef enum { T_TCP, T_SSL, T_GSSAPI, T_LABELED } transport_t;
-typedef enum { F_IGNORE, F_SYSLOG, F_EXEC, F_SUSPEND, F_SINGLE, F_HALT } fail_t;
typedef enum { F_ASCII, F_MANAGED } format_t;
+typedef enum { FA_IGNORE, FA_SYSLOG, FA_EXEC, FA_SUSPEND,
+ FA_SINGLE, FA_HALT, FA_STOP } failure_action_t;
typedef struct remote_conf
{
@@ -37,9 +38,25 @@
transport_t transport;
mode_t mode;
unsigned int queue_depth;
- fail_t fail_action;
- const char *fail_exe;
format_t format;
+ unsigned int network_retry_time;
+ unsigned int max_tries_per_record;
+ unsigned int max_time_per_record;
+
+ failure_action_t network_failure_action;
+ const char *network_failure_exe;
+ failure_action_t disk_low_action;
+ const char *disk_low_exe;
+ failure_action_t disk_full_action;
+ const char *disk_full_exe;
+ failure_action_t disk_error_action;
+ const char *disk_error_exe;
+ failure_action_t remote_ending_action;
+ const char *remote_ending_exe;
+ failure_action_t generic_error_action;
+ const char *generic_error_exe;
+ failure_action_t generic_warning_action;
+ const char *generic_warning_exe;
} remote_conf_t;
void clear_config(remote_conf_t *config);
diff -x .svn -U 3 -r pristine/src/auditd-event.c trunk/src/auditd-event.c
--- pristine/src/auditd-event.c 2008-08-15 15:52:05.000000000 -0400
+++ trunk/src/auditd-event.c 2008-08-16 01:04:33.000000000 -0400
@@ -398,6 +398,9 @@
if (data->head->ack_socket) {
unsigned char header[AUDIT_RMW_HEADER_SIZE];
+ if (fs_space_warning)
+ ack_type = AUDIT_RMW_TYPE_DISKLOW;
+
AUDIT_RMW_PACK_HEADER (header, 0, ack_type, strlen(msg), data->head->sequence_id);
ar_write (data->head->ack_socket, header, AUDIT_RMW_HEADER_SIZE);
15 years, 10 months
- 4
- 6
Question about setting watches in auto-mounted directories in RHEL 5.2
by Taylor_Tad＠emc.com
I'd like to set a file system watch so that any activity in an
auto-mounted directory is audited. It looks like just setting a watch
on a parent directory isn't sufficient. For example, if I have
directory path /dir1/dir2 and auto-mount something at
/dir1/dir2/mount-dir, setting a file system watch on /dir1/dir2 doesn't
detect activity in the auto-mounted subtree. Looking at the auditctl
man page, it looks like I'd have to issue a command like "/sbin/auditctl
-q /dir1/dir2/mount-dir,/dir1/dir2" to tell the kernel to watch the
newly mounted file system as well. Unfortunately, auto-mounts are,
well, automatic, so there's no one to issue that command.
Am I missing a better way to accomplish this goal? Is my understanding
wrong? Any help would be appreciated. Thanks,
--Tad Taylor
15 years, 11 months
- 3
- 4
check_ack()
by Lucas C. Villa Real
Hi, guys!
I have a question regarding the use of check_ack() in audit_send().
Every message sent from auditd to the kernel through audit_send() is
flagged with NLM_F_ACK. That flag tells the kernel to reply with an
ACK, which will then be expected to be read by check_ack(), right
after audit_send's call to sendto().
check_ack() just attempts to read nonblocking and, if it succeeds
doing so, it's guaranteed that the kernel received our message.
However, since netlink is a connectionless socket, once cannot infer
that the lack of an ACK means that the kernel didn't receive that
message. Similarly, in a very stressed system, one can just get
-ENOBUFS when attempting to get a reply, even though sendto()
succeeded sending the original message.
So, at least in a scenario where Audit is a key component and
performance matters, wouldn't it make sense to just remove NLM_F_ACK
from outgoing messages and just let audit_send() use the return value
from sendto() to tell if the message has been sent instead?
I'm planning to test this change in a pretty I/O intensive server over
the next week, but I'd really like to hear your comments on this
before I proceed.
Thank you very much!
Lucas
15 years, 11 months
- 2
- 1
cron and aureport
by Phillip Programmer
Hi,
We are running into a strange issue when we run reports inside of a script
as root everything works fine. When we point the root crontab at the same
script it no longer returns any results.
For example we have the script something like this below:
#!/bin/bash
#
# script foo.sh
# report to log.
###########################################
/sbin/aureport -i -f -ts today --failed > /root/someloghere
# end script
When we run foo.sh as root from a command prompt it works fine.
When we run it from a crontab it doesn't return any results.
We has also tried adding the path to the file .
/sbin/aureport -i -f -ts today --failed > /root/someloghere -if
/var/log/audit/audit.log > /root/someloghere
We are running RHEL5.1 x64 if that matters.
I also downloaded and built the aureport and ausearch still it had to
effect.
Is there something we are doing wrong?
Thanks
Phillip
15 years, 11 months
- 2
- 1
PATCH: ausearch doesn't correcly act as a filter when no EOF on input
by Tony Jones
This was filed as a bug in our bugzilla.
works : cat /var/log/audit/audit.log | ausearch -i -if /dev/stdin | cat
doesnt: tail -f /var/log/audit/audit.log | ausearch -i -if /dev/stdin | cat
Obviously it's a contrived example, they have more interesting processes each
side of the filter. Issue is that tail -f never indicates EOF and if ausearch
stdout is a pipe (versus a file), the output can remain queued in the pipebuf.
Following patch fixes it, or a simpler patch could unconditionally flush stdout.
I've not looked for similar issues elsewhere.
Tony
--- ausearch.c.old 2008-11-17 15:55:47.000000000 -0800
+++ ausearch.c 2008-11-17 16:06:54.000000000 -0800
@@ -58,11 +58,11 @@
extern int match(llist *l);
extern void output_record(llist *l);
-static int input_is_pipe(void)
+static int is_pipe(int fd)
{
struct stat st;
- if (fstat(0, &st) == 0) {
+ if (fstat(fd, &st) == 0) {
if (S_ISFIFO(st.st_mode))
pipe_mode = 1;
}
@@ -92,7 +92,7 @@
rc = process_file(user_file);
else if (force_logs)
rc = process_logs();
- else if (input_is_pipe())
+ else if (is_pipe(0))
rc = process_stdin();
else
rc = process_logs();
@@ -175,6 +175,7 @@
{
llist entries; // entries in a record
int ret;
+ int flush = is_pipe(1);
/* For each record in file */
list_create(&entries);
@@ -185,6 +186,8 @@
}
if (match(&entries)) {
output_record(&entries);
+ if (flush)
+ fflush(stdout);
found = 1;
if (just_one) {
list_clear(&entries);
15 years, 11 months
- 2
- 2
[Fwd: Re: Latest Audit on RHEL 5.2]
by LC Bruzenak
On Wed, 2008-11-12 at 11:16 -0500, Dan Gruhn wrote:
> Greetings,
>
> I have some systems with RHEL 5.2 (a server and three workstations)
> that I'd like to put the latest audit software on to put me on the
> path of getting NISPOM approval. My plan is to get to the point that I
> will have prelude running with information display via Prewikka.
>
> 1) I have read the HowTo at
> http://people.redhat.com/sgrubb/audit/prelude.txt but it seems rather
> old as it talks about audit 1.6.6 to 1.6.7 upgrading and updates to
> come after things have been checked out. Does anyone have any updates
> to this procedure that will be helpful?
I have used this procedure for 1.7.7 and soon 1.7.9.
I believe it is up to date.
I assume you want to point all machines to just one which will display
the prewikka info? If that is the case you will need to register the
audit senders to the single prelude-manager which isn't detailed exactly
on those instructions (last I looked).
However, it is easy. Just follow the instructions for single server and
then register the non-prewikka machines to the main collector.
I register the audit prelude sensor with the prelude-manager on each
host. Then I register the prelude-manager to the prelude-manager on the
Prelude Collector/Server (set the "parent-managers" option
in /etc/prelude-manager/prelude-manager.conf.
Here are some example instructions for the above.
Edit /etc/prelude-manager/prelude-manager.conf
* Locate and uncomment the [relaying] section
* Add parent-managers = <prelude server IP>
Register the prelude-manager with the Prelude Server's prelude-manager :
* Run prelude-admin register prelude-manager "idmef:w" <prelude
server IP> --uid 0 --gid 0
* Open a second terminal window and ssh <prelude server IP>
* On the Prelude Server, run: prelude-admin registration-server
prelude-manager
* The Prelude Server will generate a one time password. You will
need to copy and paste the password to the first window when it
prompts for the password.
* Confirm the password
* Acknowledge the registration in the Prelude Server terminal
window.
LCB.
--
LC (Lenny) Bruzenak
lenny(a)magitekltd.com
15 years, 11 months
- 1
- 0
Dispatcher buffer size
by Kevin Boyce
Folks,
Does anyone know if there is a way to adjust the buffer size between the
auditd process and the dispatcher? Currently, I think it is set to
128KB (according to the man page) for audit-1.0.15
Thanks,
Kevin
15 years, 11 months
- 2
- 1
Handling -ENOBUFS
by Lucas C. Villa Real
Hi guys,
I'm facing a situation where -ENOBUFS is returned from both
audit_send() and audit_get_reply(). The system is under high stress,
with 250k files being created and having creat() and chmod() syscalls
audited.
Looking the code at lib/netlink.c, I saw that audit_send() doesn't
handle -ENOBUFS. Would it be possible to replace the condition from
"while (retval < 0 && errno == EINTR)" to "while (retval < 0 && (errno
== EINTR || errno == ENOBUFS))" to fix the problem when sending
packets from userspace to kernel?
My understanding for the problem in audit_get_reply() is that the I/O
buffers are all full and auditd was just not scheduled at the expected
rate, causing these buffers to overflow. Does that make sense? If it
does, do you have a suggestion about the best way to approach this
problem, besides changing auditd's priority? I thought of a dirty
trick such as forcing auditd to be rescheduled, but that would be way
too intrusive.
One interesting thing which I noticed is that 'auditctl -s' doesn't
report that messages were lost, although a few events did not appear
in the logs. I'm still not sure if they didn't appear because of this
specific problem, but given that ENOBUFS was returned I would expect
to see a positive counter in "lost" below:
AUDIT_STATUS: enabled=1 flag=1 pid=3821 rate_limit=0
backlog_limit=8192 lost=0 backlog=0
This is happening with an old kernel, 2.6.16.46 + a bunch of patches,
and audit 1.7.4. I cannot completely upgrade it to a new release, but
I can certainly backport audit specific bits if you remember having
fixed something similar since then.
Thanks,
Lucas
15 years, 11 months
- 3
- 5