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Diffstat (limited to 'kernel/auditsc.c')
-rw-r--r--kernel/auditsc.c279
1 files changed, 247 insertions, 32 deletions
diff --git a/kernel/auditsc.c b/kernel/auditsc.c
index cf5bc2f5f9c..4819f371197 100644
--- a/kernel/auditsc.c
+++ b/kernel/auditsc.c
@@ -65,6 +65,7 @@
#include <linux/highmem.h>
#include <linux/syscalls.h>
#include <linux/inotify.h>
+#include <linux/capability.h>
#include "audit.h"
@@ -84,6 +85,15 @@ int audit_n_rules;
/* determines whether we collect data for signals sent */
int audit_signals;
+struct audit_cap_data {
+ kernel_cap_t permitted;
+ kernel_cap_t inheritable;
+ union {
+ unsigned int fE; /* effective bit of a file capability */
+ kernel_cap_t effective; /* effective set of a process */
+ };
+};
+
/* When fs/namei.c:getname() is called, we store the pointer in name and
* we don't let putname() free it (instead we free all of the saved
* pointers at syscall exit time).
@@ -100,6 +110,8 @@ struct audit_names {
gid_t gid;
dev_t rdev;
u32 osid;
+ struct audit_cap_data fcap;
+ unsigned int fcap_ver;
};
struct audit_aux_data {
@@ -184,6 +196,20 @@ struct audit_aux_data_pids {
int pid_count;
};
+struct audit_aux_data_bprm_fcaps {
+ struct audit_aux_data d;
+ struct audit_cap_data fcap;
+ unsigned int fcap_ver;
+ struct audit_cap_data old_pcap;
+ struct audit_cap_data new_pcap;
+};
+
+struct audit_aux_data_capset {
+ struct audit_aux_data d;
+ pid_t pid;
+ struct audit_cap_data cap;
+};
+
struct audit_tree_refs {
struct audit_tree_refs *next;
struct audit_chunk *c[31];
@@ -421,6 +447,7 @@ static int audit_filter_rules(struct task_struct *tsk,
struct audit_names *name,
enum audit_state *state)
{
+ const struct cred *cred = get_task_cred(tsk);
int i, j, need_sid = 1;
u32 sid;
@@ -440,28 +467,28 @@ static int audit_filter_rules(struct task_struct *tsk,
}
break;
case AUDIT_UID:
- result = audit_comparator(tsk->uid, f->op, f->val);
+ result = audit_comparator(cred->uid, f->op, f->val);
break;
case AUDIT_EUID:
- result = audit_comparator(tsk->euid, f->op, f->val);
+ result = audit_comparator(cred->euid, f->op, f->val);
break;
case AUDIT_SUID:
- result = audit_comparator(tsk->suid, f->op, f->val);
+ result = audit_comparator(cred->suid, f->op, f->val);
break;
case AUDIT_FSUID:
- result = audit_comparator(tsk->fsuid, f->op, f->val);
+ result = audit_comparator(cred->fsuid, f->op, f->val);
break;
case AUDIT_GID:
- result = audit_comparator(tsk->gid, f->op, f->val);
+ result = audit_comparator(cred->gid, f->op, f->val);
break;
case AUDIT_EGID:
- result = audit_comparator(tsk->egid, f->op, f->val);
+ result = audit_comparator(cred->egid, f->op, f->val);
break;
case AUDIT_SGID:
- result = audit_comparator(tsk->sgid, f->op, f->val);
+ result = audit_comparator(cred->sgid, f->op, f->val);
break;
case AUDIT_FSGID:
- result = audit_comparator(tsk->fsgid, f->op, f->val);
+ result = audit_comparator(cred->fsgid, f->op, f->val);
break;
case AUDIT_PERS:
result = audit_comparator(tsk->personality, f->op, f->val);
@@ -615,8 +642,10 @@ static int audit_filter_rules(struct task_struct *tsk,
break;
}
- if (!result)
+ if (!result) {
+ put_cred(cred);
return 0;
+ }
}
if (rule->filterkey && ctx)
ctx->filterkey = kstrdup(rule->filterkey, GFP_ATOMIC);
@@ -624,6 +653,7 @@ static int audit_filter_rules(struct task_struct *tsk,
case AUDIT_NEVER: *state = AUDIT_DISABLED; break;
case AUDIT_ALWAYS: *state = AUDIT_RECORD_CONTEXT; break;
}
+ put_cred(cred);
return 1;
}
@@ -1171,8 +1201,38 @@ static void audit_log_execve_info(struct audit_context *context,
kfree(buf);
}
+static void audit_log_cap(struct audit_buffer *ab, char *prefix, kernel_cap_t *cap)
+{
+ int i;
+
+ audit_log_format(ab, " %s=", prefix);
+ CAP_FOR_EACH_U32(i) {
+ audit_log_format(ab, "%08x", cap->cap[(_KERNEL_CAPABILITY_U32S-1) - i]);
+ }
+}
+
+static void audit_log_fcaps(struct audit_buffer *ab, struct audit_names *name)
+{
+ kernel_cap_t *perm = &name->fcap.permitted;
+ kernel_cap_t *inh = &name->fcap.inheritable;
+ int log = 0;
+
+ if (!cap_isclear(*perm)) {
+ audit_log_cap(ab, "cap_fp", perm);
+ log = 1;
+ }
+ if (!cap_isclear(*inh)) {
+ audit_log_cap(ab, "cap_fi", inh);
+ log = 1;
+ }
+
+ if (log)
+ audit_log_format(ab, " cap_fe=%d cap_fver=%x", name->fcap.fE, name->fcap_ver);
+}
+
static void audit_log_exit(struct audit_context *context, struct task_struct *tsk)
{
+ const struct cred *cred;
int i, call_panic = 0;
struct audit_buffer *ab;
struct audit_aux_data *aux;
@@ -1182,14 +1242,15 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
context->pid = tsk->pid;
if (!context->ppid)
context->ppid = sys_getppid();
- context->uid = tsk->uid;
- context->gid = tsk->gid;
- context->euid = tsk->euid;
- context->suid = tsk->suid;
- context->fsuid = tsk->fsuid;
- context->egid = tsk->egid;
- context->sgid = tsk->sgid;
- context->fsgid = tsk->fsgid;
+ cred = current_cred();
+ context->uid = cred->uid;
+ context->gid = cred->gid;
+ context->euid = cred->euid;
+ context->suid = cred->suid;
+ context->fsuid = cred->fsuid;
+ context->egid = cred->egid;
+ context->sgid = cred->sgid;
+ context->fsgid = cred->fsgid;
context->personality = tsk->personality;
ab = audit_log_start(context, GFP_KERNEL, AUDIT_SYSCALL);
@@ -1334,6 +1395,28 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
audit_log_format(ab, "fd0=%d fd1=%d", axs->fd[0], axs->fd[1]);
break; }
+ case AUDIT_BPRM_FCAPS: {
+ struct audit_aux_data_bprm_fcaps *axs = (void *)aux;
+ audit_log_format(ab, "fver=%x", axs->fcap_ver);
+ audit_log_cap(ab, "fp", &axs->fcap.permitted);
+ audit_log_cap(ab, "fi", &axs->fcap.inheritable);
+ audit_log_format(ab, " fe=%d", axs->fcap.fE);
+ audit_log_cap(ab, "old_pp", &axs->old_pcap.permitted);
+ audit_log_cap(ab, "old_pi", &axs->old_pcap.inheritable);
+ audit_log_cap(ab, "old_pe", &axs->old_pcap.effective);
+ audit_log_cap(ab, "new_pp", &axs->new_pcap.permitted);
+ audit_log_cap(ab, "new_pi", &axs->new_pcap.inheritable);
+ audit_log_cap(ab, "new_pe", &axs->new_pcap.effective);
+ break; }
+
+ case AUDIT_CAPSET: {
+ struct audit_aux_data_capset *axs = (void *)aux;
+ audit_log_format(ab, "pid=%d", axs->pid);
+ audit_log_cap(ab, "cap_pi", &axs->cap.inheritable);
+ audit_log_cap(ab, "cap_pp", &axs->cap.permitted);
+ audit_log_cap(ab, "cap_pe", &axs->cap.effective);
+ break; }
+
}
audit_log_end(ab);
}
@@ -1421,6 +1504,8 @@ static void audit_log_exit(struct audit_context *context, struct task_struct *ts
}
}
+ audit_log_fcaps(ab, n);
+
audit_log_end(ab);
}
@@ -1459,7 +1544,6 @@ void audit_free(struct task_struct *tsk)
/**
* audit_syscall_entry - fill in an audit record at syscall entry
- * @tsk: task being audited
* @arch: architecture type
* @major: major syscall type (function)
* @a1: additional syscall register 1
@@ -1548,9 +1632,25 @@ void audit_syscall_entry(int arch, int major,
context->ppid = 0;
}
+void audit_finish_fork(struct task_struct *child)
+{
+ struct audit_context *ctx = current->audit_context;
+ struct audit_context *p = child->audit_context;
+ if (!p || !ctx || !ctx->auditable)
+ return;
+ p->arch = ctx->arch;
+ p->major = ctx->major;
+ memcpy(p->argv, ctx->argv, sizeof(ctx->argv));
+ p->ctime = ctx->ctime;
+ p->dummy = ctx->dummy;
+ p->auditable = ctx->auditable;
+ p->in_syscall = ctx->in_syscall;
+ p->filterkey = kstrdup(ctx->filterkey, GFP_KERNEL);
+ p->ppid = current->pid;
+}
+
/**
* audit_syscall_exit - deallocate audit context after a system call
- * @tsk: task being audited
* @valid: success/failure flag
* @return_code: syscall return value
*
@@ -1787,8 +1887,36 @@ static int audit_inc_name_count(struct audit_context *context,
return 0;
}
+
+static inline int audit_copy_fcaps(struct audit_names *name, const struct dentry *dentry)
+{
+ struct cpu_vfs_cap_data caps;
+ int rc;
+
+ memset(&name->fcap.permitted, 0, sizeof(kernel_cap_t));
+ memset(&name->fcap.inheritable, 0, sizeof(kernel_cap_t));
+ name->fcap.fE = 0;
+ name->fcap_ver = 0;
+
+ if (!dentry)
+ return 0;
+
+ rc = get_vfs_caps_from_disk(dentry, &caps);
+ if (rc)
+ return rc;
+
+ name->fcap.permitted = caps.permitted;
+ name->fcap.inheritable = caps.inheritable;
+ name->fcap.fE = !!(caps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
+ name->fcap_ver = (caps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
+
+ return 0;
+}
+
+
/* Copy inode data into an audit_names. */
-static void audit_copy_inode(struct audit_names *name, const struct inode *inode)
+static void audit_copy_inode(struct audit_names *name, const struct dentry *dentry,
+ const struct inode *inode)
{
name->ino = inode->i_ino;
name->dev = inode->i_sb->s_dev;
@@ -1797,6 +1925,7 @@ static void audit_copy_inode(struct audit_names *name, const struct inode *inode
name->gid = inode->i_gid;
name->rdev = inode->i_rdev;
security_inode_getsecid(inode, &name->osid);
+ audit_copy_fcaps(name, dentry);
}
/**
@@ -1831,7 +1960,7 @@ void __audit_inode(const char *name, const struct dentry *dentry)
context->names[idx].name = NULL;
}
handle_path(dentry);
- audit_copy_inode(&context->names[idx], inode);
+ audit_copy_inode(&context->names[idx], dentry, inode);
}
/**
@@ -1892,7 +2021,7 @@ void __audit_inode_child(const char *dname, const struct dentry *dentry,
if (!strcmp(dname, n->name) ||
!audit_compare_dname_path(dname, n->name, &dirlen)) {
if (inode)
- audit_copy_inode(n, inode);
+ audit_copy_inode(n, NULL, inode);
else
n->ino = (unsigned long)-1;
found_child = n->name;
@@ -1906,7 +2035,7 @@ add_names:
return;
idx = context->name_count - 1;
context->names[idx].name = NULL;
- audit_copy_inode(&context->names[idx], parent);
+ audit_copy_inode(&context->names[idx], NULL, parent);
}
if (!found_child) {
@@ -1927,7 +2056,7 @@ add_names:
}
if (inode)
- audit_copy_inode(&context->names[idx], inode);
+ audit_copy_inode(&context->names[idx], NULL, inode);
else
context->names[idx].ino = (unsigned long)-1;
}
@@ -1942,15 +2071,18 @@ EXPORT_SYMBOL_GPL(__audit_inode_child);
*
* Also sets the context as auditable.
*/
-void auditsc_get_stamp(struct audit_context *ctx,
+int auditsc_get_stamp(struct audit_context *ctx,
struct timespec *t, unsigned int *serial)
{
+ if (!ctx->in_syscall)
+ return 0;
if (!ctx->serial)
ctx->serial = audit_serial();
t->tv_sec = ctx->ctime.tv_sec;
t->tv_nsec = ctx->ctime.tv_nsec;
*serial = ctx->serial;
ctx->auditable = 1;
+ return 1;
}
/* global counter which is incremented every time something logs in */
@@ -1978,7 +2110,7 @@ int audit_set_loginuid(struct task_struct *task, uid_t loginuid)
audit_log_format(ab, "login pid=%d uid=%u "
"old auid=%u new auid=%u"
" old ses=%u new ses=%u",
- task->pid, task->uid,
+ task->pid, task_uid(task),
task->loginuid, loginuid,
task->sessionid, sessionid);
audit_log_end(ab);
@@ -2361,7 +2493,7 @@ void __audit_ptrace(struct task_struct *t)
context->target_pid = t->pid;
context->target_auid = audit_get_loginuid(t);
- context->target_uid = t->uid;
+ context->target_uid = task_uid(t);
context->target_sessionid = audit_get_sessionid(t);
security_task_getsecid(t, &context->target_sid);
memcpy(context->target_comm, t->comm, TASK_COMM_LEN);
@@ -2380,6 +2512,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
struct audit_aux_data_pids *axp;
struct task_struct *tsk = current;
struct audit_context *ctx = tsk->audit_context;
+ uid_t uid = current_uid(), t_uid = task_uid(t);
if (audit_pid && t->tgid == audit_pid) {
if (sig == SIGTERM || sig == SIGHUP || sig == SIGUSR1 || sig == SIGUSR2) {
@@ -2387,7 +2520,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
if (tsk->loginuid != -1)
audit_sig_uid = tsk->loginuid;
else
- audit_sig_uid = tsk->uid;
+ audit_sig_uid = uid;
security_task_getsecid(tsk, &audit_sig_sid);
}
if (!audit_signals || audit_dummy_context())
@@ -2399,7 +2532,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
if (!ctx->target_pid) {
ctx->target_pid = t->tgid;
ctx->target_auid = audit_get_loginuid(t);
- ctx->target_uid = t->uid;
+ ctx->target_uid = t_uid;
ctx->target_sessionid = audit_get_sessionid(t);
security_task_getsecid(t, &ctx->target_sid);
memcpy(ctx->target_comm, t->comm, TASK_COMM_LEN);
@@ -2420,7 +2553,7 @@ int __audit_signal_info(int sig, struct task_struct *t)
axp->target_pid[axp->pid_count] = t->tgid;
axp->target_auid[axp->pid_count] = audit_get_loginuid(t);
- axp->target_uid[axp->pid_count] = t->uid;
+ axp->target_uid[axp->pid_count] = t_uid;
axp->target_sessionid[axp->pid_count] = audit_get_sessionid(t);
security_task_getsecid(t, &axp->target_sid[axp->pid_count]);
memcpy(axp->target_comm[axp->pid_count], t->comm, TASK_COMM_LEN);
@@ -2430,6 +2563,86 @@ int __audit_signal_info(int sig, struct task_struct *t)
}
/**
+ * __audit_log_bprm_fcaps - store information about a loading bprm and relevant fcaps
+ * @bprm: pointer to the bprm being processed
+ * @new: the proposed new credentials
+ * @old: the old credentials
+ *
+ * Simply check if the proc already has the caps given by the file and if not
+ * store the priv escalation info for later auditing at the end of the syscall
+ *
+ * -Eric
+ */
+int __audit_log_bprm_fcaps(struct linux_binprm *bprm,
+ const struct cred *new, const struct cred *old)
+{
+ struct audit_aux_data_bprm_fcaps *ax;
+ struct audit_context *context = current->audit_context;
+ struct cpu_vfs_cap_data vcaps;
+ struct dentry *dentry;
+
+ ax = kmalloc(sizeof(*ax), GFP_KERNEL);
+ if (!ax)
+ return -ENOMEM;
+
+ ax->d.type = AUDIT_BPRM_FCAPS;
+ ax->d.next = context->aux;
+ context->aux = (void *)ax;
+
+ dentry = dget(bprm->file->f_dentry);
+ get_vfs_caps_from_disk(dentry, &vcaps);
+ dput(dentry);
+
+ ax->fcap.permitted = vcaps.permitted;
+ ax->fcap.inheritable = vcaps.inheritable;
+ ax->fcap.fE = !!(vcaps.magic_etc & VFS_CAP_FLAGS_EFFECTIVE);
+ ax->fcap_ver = (vcaps.magic_etc & VFS_CAP_REVISION_MASK) >> VFS_CAP_REVISION_SHIFT;
+
+ ax->old_pcap.permitted = old->cap_permitted;
+ ax->old_pcap.inheritable = old->cap_inheritable;
+ ax->old_pcap.effective = old->cap_effective;
+
+ ax->new_pcap.permitted = new->cap_permitted;
+ ax->new_pcap.inheritable = new->cap_inheritable;
+ ax->new_pcap.effective = new->cap_effective;
+ return 0;
+}
+
+/**
+ * __audit_log_capset - store information about the arguments to the capset syscall
+ * @pid: target pid of the capset call
+ * @new: the new credentials
+ * @old: the old (current) credentials
+ *
+ * Record the aguments userspace sent to sys_capset for later printing by the
+ * audit system if applicable
+ */
+int __audit_log_capset(pid_t pid,
+ const struct cred *new, const struct cred *old)
+{
+ struct audit_aux_data_capset *ax;
+ struct audit_context *context = current->audit_context;
+
+ if (likely(!audit_enabled || !context || context->dummy))
+ return 0;
+
+ ax = kmalloc(sizeof(*ax), GFP_KERNEL);
+ if (!ax)
+ return -ENOMEM;
+
+ ax->d.type = AUDIT_CAPSET;
+ ax->d.next = context->aux;
+ context->aux = (void *)ax;
+
+ ax->pid = pid;
+ ax->cap.effective = new->cap_effective;
+ ax->cap.inheritable = new->cap_effective;
+ ax->cap.permitted = new->cap_permitted;
+
+ return 0;
+}
+
+/**
* audit_core_dumps - record information about processes that end abnormally
* @signr: signal value
*
@@ -2440,7 +2653,8 @@ void audit_core_dumps(long signr)
{
struct audit_buffer *ab;
u32 sid;
- uid_t auid = audit_get_loginuid(current);
+ uid_t auid = audit_get_loginuid(current), uid;
+ gid_t gid;
unsigned int sessionid = audit_get_sessionid(current);
if (!audit_enabled)
@@ -2450,8 +2664,9 @@ void audit_core_dumps(long signr)
return;
ab = audit_log_start(NULL, GFP_KERNEL, AUDIT_ANOM_ABEND);
+ current_uid_gid(&uid, &gid);
audit_log_format(ab, "auid=%u uid=%u gid=%u ses=%u",
- auid, current->uid, current->gid, sessionid);
+ auid, uid, gid, sessionid);
security_task_getsecid(current, &sid);
if (sid) {
char *ctx = NULL;
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 12:23:08 +0000