From c04049939f88b29e235d2da217bce6e8ead44f32 Mon Sep 17 00:00:00 2001 From: Steve Grubb Date: Fri, 13 May 2005 18:17:42 +0100 Subject: AUDIT: Add message types to audit records This patch adds more messages types to the audit subsystem so that audit analysis is quicker, intuitive, and more useful. Signed-off-by: Steve Grubb --- I forgot one type in the big patch. I need to add one for user space originating SE Linux avc messages. This is used by dbus and nscd. -Steve --- Updated to 2.6.12-rc4-mm1. -dwmw2 Signed-off-by: David Woodhouse --- kernel/audit.c | 78 +++++++++++++++++++++++++++++++++++++++++----------------- 1 file changed, 55 insertions(+), 23 deletions(-) (limited to 'kernel/audit.c') diff --git a/kernel/audit.c b/kernel/audit.c index 187164572bd0..4e940c05ede8 100644 --- a/kernel/audit.c +++ b/kernel/audit.c @@ -140,6 +140,12 @@ struct audit_buffer { struct audit_context *ctx; /* NULL or associated context */ }; +static void audit_set_pid(struct audit_buffer *ab, pid_t pid) +{ + struct nlmsghdr *nlh = (struct nlmsghdr *)ab->skb->data; + nlh->nlmsg_pid = pid; +} + struct audit_entry { struct list_head list; struct audit_rule rule; @@ -233,7 +239,8 @@ static int audit_set_rate_limit(int limit, uid_t loginuid) { int old = audit_rate_limit; audit_rate_limit = limit; - audit_log(NULL, "audit_rate_limit=%d old=%d by auid %u", + audit_log(NULL, AUDIT_CONFIG_CHANGE, + "audit_rate_limit=%d old=%d by auid %u", audit_rate_limit, old, loginuid); return old; } @@ -242,7 +249,8 @@ static int audit_set_backlog_limit(int limit, uid_t loginuid) { int old = audit_backlog_limit; audit_backlog_limit = limit; - audit_log(NULL, "audit_backlog_limit=%d old=%d by auid %u", + audit_log(NULL, AUDIT_CONFIG_CHANGE, + "audit_backlog_limit=%d old=%d by auid %u", audit_backlog_limit, old, loginuid); return old; } @@ -253,8 +261,9 @@ static int audit_set_enabled(int state, uid_t loginuid) if (state != 0 && state != 1) return -EINVAL; audit_enabled = state; - audit_log(NULL, "audit_enabled=%d old=%d by auid %u", - audit_enabled, old, loginuid); + audit_log(NULL, AUDIT_CONFIG_CHANGE, + "audit_enabled=%d old=%d by auid %u", + audit_enabled, old, loginuid); return old; } @@ -266,8 +275,9 @@ static int audit_set_failure(int state, uid_t loginuid) && state != AUDIT_FAIL_PANIC) return -EINVAL; audit_failure = state; - audit_log(NULL, "audit_failure=%d old=%d by auid %u", - audit_failure, old, loginuid); + audit_log(NULL, AUDIT_CONFIG_CHANGE, + "audit_failure=%d old=%d by auid %u", + audit_failure, old, loginuid); return old; } @@ -316,6 +326,14 @@ static int audit_netlink_ok(kernel_cap_t eff_cap, u16 msg_type) err = -EPERM; break; case AUDIT_USER: + case AUDIT_USER_AUTH: + case AUDIT_USER_ACCT: + case AUDIT_USER_MGMT: + case AUDIT_CRED_ACQ: + case AUDIT_CRED_DISP: + case AUDIT_USER_START: + case AUDIT_USER_END: + case AUDIT_USER_AVC: if (!cap_raised(eff_cap, CAP_AUDIT_WRITE)) err = -EPERM; break; @@ -332,6 +350,7 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) void *data; struct audit_status *status_get, status_set; int err; + struct audit_buffer *ab; u16 msg_type = nlh->nlmsg_type; uid_t loginuid; /* loginuid of sender */ struct audit_sig_info sig_data; @@ -373,7 +392,8 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) if (status_get->mask & AUDIT_STATUS_PID) { int old = audit_pid; audit_pid = status_get->pid; - audit_log(NULL, "audit_pid=%d old=%d by auid %u", + audit_log(NULL, AUDIT_CONFIG_CHANGE, + "audit_pid=%d old=%d by auid %u", audit_pid, old, loginuid); } if (status_get->mask & AUDIT_STATUS_RATE_LIMIT) @@ -383,13 +403,26 @@ static int audit_receive_msg(struct sk_buff *skb, struct nlmsghdr *nlh) loginuid); break; case AUDIT_USER: - audit_log_type(NULL, AUDIT_USER, pid, + case AUDIT_USER_AUTH: + case AUDIT_USER_ACCT: + case AUDIT_USER_MGMT: + case AUDIT_CRED_ACQ: + case AUDIT_CRED_DISP: + case AUDIT_USER_START: + case AUDIT_USER_END: + case AUDIT_USER_AVC: + ab = audit_log_start(NULL, msg_type); + if (!ab) + break; /* audit_panic has been called */ + audit_log_format(ab, "user pid=%d uid=%d length=%d loginuid=%u" " msg='%.1024s'", pid, uid, (int)(nlh->nlmsg_len - ((char *)data - (char *)nlh)), loginuid, (char *)data); + audit_set_pid(ab, pid); + audit_log_end(ab); break; case AUDIT_ADD: case AUDIT_DEL: @@ -504,7 +537,7 @@ static int __init audit_init(void) audit_initialized = 1; audit_enabled = audit_default; - audit_log(NULL, "initialized"); + audit_log(NULL, AUDIT_KERNEL, "initialized"); return 0; } __initcall(audit_init); @@ -541,10 +574,12 @@ static void audit_buffer_free(struct audit_buffer *ab) spin_unlock_irqrestore(&audit_freelist_lock, flags); } -static struct audit_buffer * audit_buffer_alloc(int gfp_mask) +static struct audit_buffer * audit_buffer_alloc(struct audit_context *ctx, + int gfp_mask, int type) { unsigned long flags; struct audit_buffer *ab = NULL; + struct nlmsghdr *nlh; spin_lock_irqsave(&audit_freelist_lock, flags); if (!list_empty(&audit_freelist)) { @@ -566,6 +601,12 @@ static struct audit_buffer * audit_buffer_alloc(int gfp_mask) if (!ab->skb) goto err; + ab->ctx = ctx; + nlh = (struct nlmsghdr *)skb_put(ab->skb, NLMSG_SPACE(0)); + nlh->nlmsg_type = type; + nlh->nlmsg_flags = 0; + nlh->nlmsg_pid = 0; + nlh->nlmsg_seq = 0; return ab; err: audit_buffer_free(ab); @@ -578,12 +619,11 @@ err: * syscall, then the syscall is marked as auditable and an audit record * will be written at syscall exit. If there is no associated task, tsk * should be NULL. */ -struct audit_buffer *audit_log_start(struct audit_context *ctx, int type, int pid) +struct audit_buffer *audit_log_start(struct audit_context *ctx, int type) { struct audit_buffer *ab = NULL; struct timespec t; unsigned int serial; - struct nlmsghdr *nlh; if (!audit_initialized) return NULL; @@ -600,19 +640,12 @@ struct audit_buffer *audit_log_start(struct audit_context *ctx, int type, int pi return NULL; } - ab = audit_buffer_alloc(GFP_ATOMIC); + ab = audit_buffer_alloc(ctx, GFP_ATOMIC, type); if (!ab) { audit_log_lost("out of memory in audit_log_start"); return NULL; } - ab->ctx = ctx; - nlh = (struct nlmsghdr *)skb_put(ab->skb, NLMSG_SPACE(0)); - nlh->nlmsg_type = type; - nlh->nlmsg_flags = 0; - nlh->nlmsg_pid = pid; - nlh->nlmsg_seq = 0; - if (!audit_get_stamp(ab->ctx, &t, &serial)) { t = CURRENT_TIME; serial = 0; @@ -809,13 +842,12 @@ void audit_log_end(struct audit_buffer *ab) /* Log an audit record. This is a convenience function that calls * audit_log_start, audit_log_vformat, and audit_log_end. It may be * called in any context. */ -void audit_log_type(struct audit_context *ctx, int type, int pid, - const char *fmt, ...) +void audit_log(struct audit_context *ctx, int type, const char *fmt, ...) { struct audit_buffer *ab; va_list args; - ab = audit_log_start(ctx, type, pid); + ab = audit_log_start(ctx, type); if (ab) { va_start(args, fmt); audit_log_vformat(ab, fmt, args); -- cgit v1.2.3