[PATCH V4 6/8] audit: log namespace serial numbers

Log the namespace serial numbers of a task in a new record type (1329) (usually accompanies audit_log_task_info() type=SYSCALL record) which is used by syscall audits, among others.. Idea first presented: https://www.redhat.com/archives/linux-audit/2013-March/msg00020.html Typical output format would look something like: type=NS_INFO msg=audit(1408577535.306:82): netns=8 utsns=2 ipcns=1 pidns=4 userns=3 mntns=5 The serial numbers are printed in hex. Suggested-by: Aristeu Rozanski <arozansk(a)redhat.com&gt; Signed-off-by: Richard Guy Briggs <rgb(a)redhat.com&gt; Acked-by: Serge Hallyn <serge.hallyn(a)canonical.com&gt; --- include/linux/audit.h | 7 +++++++ include/uapi/linux/audit.h | 1 + kernel/audit.c | 29 +++++++++++++++++++++++++++++ kernel/auditsc.c | 2 ++ security/integrity/ima/ima_api.c | 2 ++ 5 files changed, 41 insertions(+), 0 deletions(-) diff --git a/include/linux/audit.h b/include/linux/audit.h index 22cfddb..5ea3609 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -101,6 +101,13 @@ extern int __weak audit_classify_compat_syscall(int abi, unsigned syscall); struct filename; extern void audit_log_session_info(struct audit_buffer *ab); +#ifdef CONFIG_NAMESPACES +extern void audit_log_namespace_info(struct task_struct *tsk); +#else +void audit_log_namespace_info(struct task_struct *tsk) +{ +} +#endif #ifdef CONFIG_AUDIT_COMPAT_GENERIC #define audit_is_compat(arch) (!((arch) & __AUDIT_ARCH_64BIT)) diff --git a/include/uapi/linux/audit.h b/include/uapi/linux/audit.h index cf67147..84bbcdb 100644 --- a/include/uapi/linux/audit.h +++ b/include/uapi/linux/audit.h @@ -110,6 +110,7 @@ #define AUDIT_SECCOMP 1326 /* Secure Computing event */ #define AUDIT_PROCTITLE 1327 /* Proctitle emit event */ #define AUDIT_FEATURE_CHANGE 1328 /* audit log listing feature changes */ +#define AUDIT_NS_INFO 1329 /* Record process namespace IDs */ #define AUDIT_AVC 1400 /* SE Linux avc denial or grant */ #define AUDIT_SELINUX_ERR 1401 /* Internal SE Linux Errors */ diff --git a/kernel/audit.c b/kernel/audit.c index 3ef2e0e..a4c39a0 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -65,6 +65,7 @@ #include <linux/freezer.h> #include <linux/tty.h> #include <linux/pid_namespace.h> +#include <linux/proc_ns.h> #include <net/netns/generic.h> #include "audit.h" @@ -743,6 +744,8 @@ static void audit_log_feature_change(int which, u32 old_feature, u32 new_feature audit_feature_names[which], !!old_feature, !!new_feature, !!old_lock, !!new_lock, res); audit_log_end(ab); + + audit_log_namespace_info(current); } static int audit_set_feature(struct sk_buff *skb) @@ -1661,6 +1664,30 @@ void audit_log_session_info(struct audit_buffer *ab) audit_log_format(ab, " auid=%u ses=%u", auid, sessionid); } +#ifdef CONFIG_NAMESPACES +void audit_log_namespace_info(struct task_struct *tsk) +{ + const struct proc_ns_operations **entry; + bool end = false; + struct audit_buffer *ab; + + if (!tsk) + return; + ab = audit_log_start(tsk->audit_context, GFP_KERNEL, + AUDIT_NS_INFO); + if (!ab) + return; + for (entry = ns_entries; !end; entry++) { + void *ns = (*entry)->get(tsk); + audit_log_format(ab, " %sns=%llx", (*entry)->name, + (*entry)->snum(ns)); + (*entry)->put(ns); + end = (*entry)->type == CLONE_NEWNS; + } + audit_log_end(ab); +} +#endif /* CONFIG_NAMESPACES */ + void audit_log_key(struct audit_buffer *ab, char *key) { audit_log_format(ab, " key="); @@ -1933,6 +1960,8 @@ void audit_log_link_denied(const char *operation, struct path *link) audit_log_format(ab, " res=0"); audit_log_end(ab); + audit_log_namespace_info(current); + /* Generate AUDIT_PATH record with object. */ name->type = AUDIT_TYPE_NORMAL; audit_copy_inode(name, link->dentry, link->dentry->d_inode); diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 21eae3c..08b9af9 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -1383,6 +1383,8 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts audit_log_key(ab, context->filterkey); audit_log_end(ab); + audit_log_namespace_info(tsk); + for (aux = context->aux; aux; aux = aux->next) { ab = audit_log_start(context, GFP_KERNEL, aux->type); diff --git a/security/integrity/ima/ima_api.c b/security/integrity/ima/ima_api.c index d9cd5ce..06d6897 100644 --- a/security/integrity/ima/ima_api.c +++ b/security/integrity/ima/ima_api.c @@ -323,6 +323,8 @@ void ima_audit_measurement(struct integrity_iint_cache *iint, audit_log_task_info(ab, current); audit_log_end(ab); + audit_log_namespace_info(current); + iint->flags |= IMA_AUDITED; } -- 1.7.1