February 2007 - Linux-audit - Linux-Audit List Archives

by Amy Griffis

A few patches to clean up auditing for syscall objects. - stop logging bogus object labels - handle edge cases for xattr and mqueue calls - try harder to log only 1 PATH record per object These patches are based on audit.b36. Thanks for reviewing. Amy

18 years

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Login/Logouts (UNCLASSIFIED)

by Mackanick, Jason W CTR DISA GIG-OP

Classification: UNCLASSIFIED Caveats: NONE Hello everyone, Newbie to the list. I am in position of writing technical implimentation guidance for DISA and I am looking for a method to audit logins/logouts. I have not been able to come up with a syscall that would cover this. Any help would be appreciated. Jason Mackanick, CISSP DISA FSO Supports & Standards Section Technical Support Team Classification: UNCLASSIFIED Caveats: NONE

18 years, 1 month

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New to audit. Need help configuring audit to meet NISPOM req's

by Fields, Randy (Space Technology)

Hello All, I'm a linux administrator and computer security rep with a small NIS domain all running RHEL 4.4 ES on x86 platforms. I'm looking for any help, scripts, or just copies of configuration files so that I can learn from your examples while studying the man pages. Here are the list of items that I need to accomplish and I greatly appreciate any help that you can provide. 1) I need to configure a test box to meet NISPOM audit requirements. (any examples of /etc/auditd.conf and /etc/audit.rules would be great) 2) Then test it by acting as a user and trying to access files such as /etc/passwd and /etc/shadow. 3) Then report that data to prove to auditors that the tool is collecting the events. Thank you in advance. Feel free to e-mail me directly to avoid any unwanted cluttering of the message boards. Randy Fields randy.fields(a)ngc.com

18 years, 1 month

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[PATCH 1/2] add SIGNAL syscall class (v2)

by Amy Griffis

[[ Re-post adding some missing arch bitmaps ]] Add a syscall class for sending signals. Signed-off-by: Amy Griffis <amy.griffis(a)hp.com> --- arch/ia64/ia32/audit.c | 5 +++++ arch/ia64/kernel/audit.c | 8 ++++++++ arch/powerpc/kernel/audit.c | 8 ++++++++ arch/powerpc/kernel/compat_audit.c | 5 +++++ arch/s390/kernel/audit.c | 8 ++++++++ arch/s390/kernel/compat_audit.c | 5 +++++ arch/sparc64/kernel/audit.c | 8 ++++++++ arch/sparc64/kernel/compat_audit.c | 5 +++++ arch/x86_64/ia32/audit.c | 5 +++++ arch/x86_64/kernel/audit.c | 8 ++++++++ include/asm-generic/audit_signal.h | 3 +++ include/linux/audit.h | 2 ++ lib/audit.c | 6 ++++++ 13 files changed, 76 insertions(+), 0 deletions(-) diff --git a/arch/ia64/ia32/audit.c b/arch/ia64/ia32/audit.c index 92d7d0c..8850fe4 100644 --- a/arch/ia64/ia32/audit.c +++ b/arch/ia64/ia32/audit.c @@ -20,6 +20,11 @@ unsigned ia32_read_class[] = { ~0U }; +unsigned ia32_signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + int ia32_classify_syscall(unsigned syscall) { switch(syscall) { diff --git a/arch/ia64/kernel/audit.c b/arch/ia64/kernel/audit.c index 0468255..538312a 100644 --- a/arch/ia64/kernel/audit.c +++ b/arch/ia64/kernel/audit.c @@ -23,6 +23,11 @@ static unsigned chattr_class[] = { ~0U }; +static unsigned signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + int audit_classify_syscall(int abi, unsigned syscall) { #ifdef CONFIG_IA32_SUPPORT @@ -49,15 +54,18 @@ static int __init audit_classes_init(void) extern __u32 ia32_write_class[]; extern __u32 ia32_read_class[]; extern __u32 ia32_chattr_class[]; + extern __u32 ia32_signal_class[]; audit_register_class(AUDIT_CLASS_WRITE_32, ia32_write_class); audit_register_class(AUDIT_CLASS_READ_32, ia32_read_class); audit_register_class(AUDIT_CLASS_DIR_WRITE_32, ia32_dir_class); audit_register_class(AUDIT_CLASS_CHATTR_32, ia32_chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL_32, ia32_signal_class); #endif audit_register_class(AUDIT_CLASS_WRITE, write_class); audit_register_class(AUDIT_CLASS_READ, read_class); audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class); audit_register_class(AUDIT_CLASS_CHATTR, chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL, signal_class); return 0; } diff --git a/arch/powerpc/kernel/audit.c b/arch/powerpc/kernel/audit.c index 7fe5e63..66d54ba 100644 --- a/arch/powerpc/kernel/audit.c +++ b/arch/powerpc/kernel/audit.c @@ -23,6 +23,11 @@ static unsigned chattr_class[] = { ~0U }; +static unsigned signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + int audit_classify_syscall(int abi, unsigned syscall) { #ifdef CONFIG_PPC64 @@ -51,15 +56,18 @@ static int __init audit_classes_init(void) extern __u32 ppc32_write_class[]; extern __u32 ppc32_read_class[]; extern __u32 ppc32_chattr_class[]; + extern __u32 ppc32_signal_class[]; audit_register_class(AUDIT_CLASS_WRITE_32, ppc32_write_class); audit_register_class(AUDIT_CLASS_READ_32, ppc32_read_class); audit_register_class(AUDIT_CLASS_DIR_WRITE_32, ppc32_dir_class); audit_register_class(AUDIT_CLASS_CHATTR_32, ppc32_chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL_32, ppc32_signal_class); #endif audit_register_class(AUDIT_CLASS_WRITE, write_class); audit_register_class(AUDIT_CLASS_READ, read_class); audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class); audit_register_class(AUDIT_CLASS_CHATTR, chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL, signal_class); return 0; } diff --git a/arch/powerpc/kernel/compat_audit.c b/arch/powerpc/kernel/compat_audit.c index 640d4bb..108ff14 100644 --- a/arch/powerpc/kernel/compat_audit.c +++ b/arch/powerpc/kernel/compat_audit.c @@ -21,6 +21,11 @@ unsigned ppc32_read_class[] = { ~0U }; +unsigned ppc32_signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + int ppc32_classify_syscall(unsigned syscall) { switch(syscall) { diff --git a/arch/s390/kernel/audit.c b/arch/s390/kernel/audit.c index 0741d91..7affafe 100644 --- a/arch/s390/kernel/audit.c +++ b/arch/s390/kernel/audit.c @@ -23,6 +23,11 @@ static unsigned chattr_class[] = { ~0U }; +static unsigned signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + int audit_classify_syscall(int abi, unsigned syscall) { #ifdef CONFIG_COMPAT @@ -51,15 +56,18 @@ static int __init audit_classes_init(void) extern __u32 s390_write_class[]; extern __u32 s390_read_class[]; extern __u32 s390_chattr_class[]; + extern __u32 s390_signal_class[]; audit_register_class(AUDIT_CLASS_WRITE_32, s390_write_class); audit_register_class(AUDIT_CLASS_READ_32, s390_read_class); audit_register_class(AUDIT_CLASS_DIR_WRITE_32, s390_dir_class); audit_register_class(AUDIT_CLASS_CHATTR_32, s390_chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL_32, s390_signal_class); #endif audit_register_class(AUDIT_CLASS_WRITE, write_class); audit_register_class(AUDIT_CLASS_READ, read_class); audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class); audit_register_class(AUDIT_CLASS_CHATTR, chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL, signal_class); return 0; } diff --git a/arch/s390/kernel/compat_audit.c b/arch/s390/kernel/compat_audit.c index 16d9436..0569f51 100644 --- a/arch/s390/kernel/compat_audit.c +++ b/arch/s390/kernel/compat_audit.c @@ -21,6 +21,11 @@ unsigned s390_read_class[] = { ~0U }; +unsigned s390_signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + int s390_classify_syscall(unsigned syscall) { switch(syscall) { diff --git a/arch/sparc64/kernel/audit.c b/arch/sparc64/kernel/audit.c index aef19cc..d57a9da 100644 --- a/arch/sparc64/kernel/audit.c +++ b/arch/sparc64/kernel/audit.c @@ -23,6 +23,11 @@ static unsigned chattr_class[] = { ~0U }; +static unsigned signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + int audit_classify_syscall(int abi, unsigned syscall) { #ifdef CONFIG_SPARC32_COMPAT @@ -51,15 +56,18 @@ static int __init audit_classes_init(void) extern __u32 sparc32_write_class[]; extern __u32 sparc32_read_class[]; extern __u32 sparc32_chattr_class[]; + extern __u32 sparc32_signal_class[]; audit_register_class(AUDIT_CLASS_WRITE_32, sparc32_write_class); audit_register_class(AUDIT_CLASS_READ_32, sparc32_read_class); audit_register_class(AUDIT_CLASS_DIR_WRITE_32, sparc32_dir_class); audit_register_class(AUDIT_CLASS_CHATTR_32, sparc32_chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL_32, sparc32_signal_class); #endif audit_register_class(AUDIT_CLASS_WRITE, write_class); audit_register_class(AUDIT_CLASS_READ, read_class); audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class); audit_register_class(AUDIT_CLASS_CHATTR, chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL, signal_class); return 0; } diff --git a/arch/sparc64/kernel/compat_audit.c b/arch/sparc64/kernel/compat_audit.c index cca96c9..c197948 100644 --- a/arch/sparc64/kernel/compat_audit.c +++ b/arch/sparc64/kernel/compat_audit.c @@ -20,6 +20,11 @@ unsigned sparc32_read_class[] = { ~0U }; +unsigned sparc32_signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + int sparc32_classify_syscall(unsigned syscall) { switch(syscall) { diff --git a/arch/x86_64/ia32/audit.c b/arch/x86_64/ia32/audit.c index 92d7d0c..8850fe4 100644 --- a/arch/x86_64/ia32/audit.c +++ b/arch/x86_64/ia32/audit.c @@ -20,6 +20,11 @@ unsigned ia32_read_class[] = { ~0U }; +unsigned ia32_signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + int ia32_classify_syscall(unsigned syscall) { switch(syscall) { diff --git a/arch/x86_64/kernel/audit.c b/arch/x86_64/kernel/audit.c index 21f3338..b970de6 100644 --- a/arch/x86_64/kernel/audit.c +++ b/arch/x86_64/kernel/audit.c @@ -23,6 +23,11 @@ static unsigned chattr_class[] = { ~0U }; +static unsigned signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + int audit_classify_syscall(int abi, unsigned syscall) { #ifdef CONFIG_IA32_EMULATION @@ -49,15 +54,18 @@ static int __init audit_classes_init(void) extern __u32 ia32_write_class[]; extern __u32 ia32_read_class[]; extern __u32 ia32_chattr_class[]; + extern __u32 ia32_signal_class[]; audit_register_class(AUDIT_CLASS_WRITE_32, ia32_write_class); audit_register_class(AUDIT_CLASS_READ_32, ia32_read_class); audit_register_class(AUDIT_CLASS_DIR_WRITE_32, ia32_dir_class); audit_register_class(AUDIT_CLASS_CHATTR_32, ia32_chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL_32, ia32_signal_class); #endif audit_register_class(AUDIT_CLASS_WRITE, write_class); audit_register_class(AUDIT_CLASS_READ, read_class); audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class); audit_register_class(AUDIT_CLASS_CHATTR, chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL, signal_class); return 0; } diff --git a/include/asm-generic/audit_signal.h b/include/asm-generic/audit_signal.h new file mode 100644 index 0000000..6feab7f --- /dev/null +++ b/include/asm-generic/audit_signal.h @@ -0,0 +1,3 @@ +__NR_kill, +__NR_tgkill, +__NR_tkill, diff --git a/include/linux/audit.h b/include/linux/audit.h index aa205cd..0194a9b 100644 --- a/include/linux/audit.h +++ b/include/linux/audit.h @@ -147,6 +147,8 @@ #define AUDIT_CLASS_READ_32 5 #define AUDIT_CLASS_WRITE 6 #define AUDIT_CLASS_WRITE_32 7 +#define AUDIT_CLASS_SIGNAL 8 +#define AUDIT_CLASS_SIGNAL_32 9 /* This bitmask is used to validate user input. It represents all bits that * are currently used in an audit field constant understood by the kernel. diff --git a/lib/audit.c b/lib/audit.c index 3b1289f..50e9152 100644 --- a/lib/audit.c +++ b/lib/audit.c @@ -23,6 +23,11 @@ static unsigned chattr_class[] = { ~0U }; +static unsigned signal_class[] = { +#include <asm-generic/audit_signal.h> +~0U +}; + int audit_classify_syscall(int abi, unsigned syscall) { switch(syscall) { @@ -49,6 +54,7 @@ static int __init audit_classes_init(void) audit_register_class(AUDIT_CLASS_READ, read_class); audit_register_class(AUDIT_CLASS_DIR_WRITE, dir_class); audit_register_class(AUDIT_CLASS_CHATTR, chattr_class); + audit_register_class(AUDIT_CLASS_SIGNAL, signal_class); return 0; } -- 1.4.4.4

18 years, 1 month

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RHEL and Object reuse requirements.

by Sarmila Vasanthadevan

Hello, From reading the Redhat Enterprise Linux security target for CAPP document I can see that the common criteria evaluation identified these object reuse requirements (OR.1, OR.2, and OR.3) and that Redhat met these requirements. And these requirements were met in, Section 6.2.5.1, which states that file system objects are created with no contents. The exceptions are listed right above that line. Section 6.2.5.2 says that IPC objects are initialized with 0 at creation and do not change size. Section 6.2.5.3 discusses about memory objects. Can anybody help me out to identify where in the Linux source code these requirements are met. Thanks, -- Sarmila

18 years, 1 month

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Audit rules use of flags.

by Walt Powell

Hello all: I have a requirement to audit/log all failed attempts to access files. I entered the following line in audit.rules: -w exit,always -S open -F success!=0 and audit flags all file exits regardless of success. When I try: -w exit,possible -S open -F success!=0 it does NOT flag any file openings, including failure. I am curious if: -w exit,never -S open -F success=0 but I suspect that the 'first hit takes it' nature of audit-1.0.12 will make the flag at the end useless. So I suppose the question is - do I need to put the -F flag before the -w portion of the entry, or is there some other way to meet the requirement? Thank you all for any insight.

18 years, 1 month

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Which userspace packages modified for audit

by Tony Jones

Is there a list of which userspace packages have been modified in Fedora to add calls to the audit system? I thought I had them all but I didn't :-) Thanks! Tony

18 years, 1 month

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A scriptable utility for setting auid

by Matthew Booth

I needed a way to exclude a very large class of audit traffic [1] in RHEL 4. It occurred to me that if I could launch a process and give it the auid of a dedicated user, I could easily filter it out along with all child processes. With this in mind I wrote the attached simple wrapper round the audit_setloginuid. It sets its own auid to whatever you give it, then execs a command. I'm assuming that this would be better achieved in RHEL 5 using selinux context filtering. However, I hope to use this tool to achieve useful auditing on an Oracle RAC node on RHEL 4. Matt [1] It turns out that Oracle CSSD, which maintains cluster membership, is a somewhat retarded shell script. Amongst many other things, it execs both bash and awk about 8 times per second. -- Red Hat, Global Professional Services M: +44 (0)7977 267231 GPG ID: D33C3490 GPG FPR: 3733 612D 2D05 5458 8A8A 1600 3441 EA19 D33C 3490

18 years, 1 month

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audit 1.4.1 released

by Steve Grubb

Hi, I've just released a new version of the audit daemon. It can be downloaded from http://people.redhat.com/sgrubb/audit It will also be in rawhide tomorrow. The Changelog is: - updated audit_rule_fieldpair_data to handle perm correctly (#226780) - Finished search options for audit parsing library - Fix ausearch -se to work correctly - Fix auditd init script for /usr on netdev (#228528) - Parse avc seperms better when there are more than one This adds the code behind the search API of the audit parsing library. The regex code is not done at this point. The other known problem with the API right now is that it does not account for out of order records. Please let me know if there are any problems with this release. -Steve

18 years, 1 month

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[PATCH] sane security_getprocattr() API

by Alexander Viro

diff --git a/fs/proc/base.c b/fs/proc/base.c index 4f5745a..6bbfe91 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -1558,29 +1558,20 @@ static ssize_t proc_pid_attr_read(struct file * file, char __user * buf, size_t count, loff_t *ppos) { struct inode * inode = file->f_path.dentry->d_inode; - unsigned long page; + char *p = NULL; ssize_t length; struct task_struct *task = get_proc_task(inode); - length = -ESRCH; if (!task) - goto out_no_task; - - if (count > PAGE_SIZE) - count = PAGE_SIZE; - length = -ENOMEM; - if (!(page = __get_free_page(GFP_KERNEL))) - goto out; + return -ESRCH; length = security_getprocattr(task, (char*)file->f_path.dentry->d_name.name, - (void*)page, count); - if (length >= 0) - length = simple_read_from_buffer(buf, count, ppos, (char *)page, length); - free_page(page); -out: + &p); put_task_struct(task); -out_no_task: + if (length > 0) + length = simple_read_from_buffer(buf, count, ppos, p, length); + kfree(p); return length; } diff --git a/include/linux/security.h b/include/linux/security.h index 7f88d97..47e82c1 100644 --- a/include/linux/security.h +++ b/include/linux/security.h @@ -1324,7 +1324,7 @@ struct security_operations { void (*d_instantiate) (struct dentry *dentry, struct inode *inode); - int (*getprocattr)(struct task_struct *p, char *name, void *value, size_t size); + int (*getprocattr)(struct task_struct *p, char *name, char **value); int (*setprocattr)(struct task_struct *p, char *name, void *value, size_t size); int (*secid_to_secctx)(u32 secid, char **secdata, u32 *seclen); void (*release_secctx)(char *secdata, u32 seclen); @@ -2092,9 +2092,9 @@ static inline void security_d_instantiate (struct dentry *dentry, struct inode * security_ops->d_instantiate (dentry, inode); } -static inline int security_getprocattr(struct task_struct *p, char *name, void *value, size_t size) +static inline int security_getprocattr(struct task_struct *p, char *name, char **value) { - return security_ops->getprocattr(p, name, value, size); + return security_ops->getprocattr(p, name, value); } static inline int security_setprocattr(struct task_struct *p, char *name, void *value, size_t size) @@ -2749,7 +2749,7 @@ static inline int security_sem_semop (struct sem_array * sma, static inline void security_d_instantiate (struct dentry *dentry, struct inode *inode) { } -static inline int security_getprocattr(struct task_struct *p, char *name, void *value, size_t size) +static inline int security_getprocattr(struct task_struct *p, char *name, char **value) { return -EINVAL; } diff --git a/kernel/auditsc.c b/kernel/auditsc.c index 3599558..89875b2 100644 --- a/kernel/auditsc.c +++ b/kernel/auditsc.c @@ -741,26 +741,18 @@ void audit_log_task_context(struct audit_buffer *ab) char *ctx = NULL; ssize_t len = 0; - len = security_getprocattr(current, "current", NULL, 0); - if (len < 0) { + len = security_getprocattr(current, "current", &ctx); + if (len <= 0) { if (len != -EINVAL) goto error_path; return; } - ctx = kmalloc(len, GFP_KERNEL); - if (!ctx) - goto error_path; - - len = security_getprocattr(current, "current", ctx, len); - if (len < 0 ) - goto error_path; - audit_log_format(ab, " subj=%s", ctx); + kfree(ctx); return; error_path: - kfree(ctx); audit_panic("error in audit_log_task_context"); return; } diff --git a/security/dummy.c b/security/dummy.c index 558795b..8ffd764 100644 --- a/security/dummy.c +++ b/security/dummy.c @@ -907,7 +907,7 @@ static void dummy_d_instantiate (struct dentry *dentry, struct inode *inode) return; } -static int dummy_getprocattr(struct task_struct *p, char *name, void *value, size_t size) +static int dummy_getprocattr(struct task_struct *p, char *name, char **value) { return -EINVAL; } diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c index b1ac22d..0b265a5 100644 --- a/security/selinux/hooks.c +++ b/security/selinux/hooks.c @@ -4468,11 +4468,12 @@ static void selinux_d_instantiate (struct dentry *dentry, struct inode *inode) } static int selinux_getprocattr(struct task_struct *p, - char *name, void *value, size_t size) + char *name, char **value) { struct task_security_struct *tsec; u32 sid; int error; + unsigned len; if (current != p) { error = task_has_perm(current, p, PROCESS__GETATTR); @@ -4500,7 +4501,10 @@ static int selinux_getprocattr(struct task_struct *p, if (!sid) return 0; - return selinux_getsecurity(sid, value, size); + error = security_sid_to_context(sid, value, &len); + if (error) + return error; + return len; } static int selinux_setprocattr(struct task_struct *p,

18 years, 1 month

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Linux-audit February 2007