1 files changed, 456 insertions, 0 deletions

diff --git a/security/tomoyo/audit.c b/security/tomoyo/audit.c
new file mode 100644
index 000000000000..5dbb1f7617c0
--- /dev/null
+++ b/security/tomoyo/audit.c
@@ -0,0 +1,456 @@
+/*
+ * security/tomoyo/audit.c
+ *
+ * Copyright (C) 2005-2011  NTT DATA CORPORATION
+ */
+
+#include "common.h"
+#include <linux/slab.h>
+
+/**
+ * tomoyo_print_bprm - Print "struct linux_binprm" for auditing.
+ *
+ * @bprm: Pointer to "struct linux_binprm".
+ * @dump: Pointer to "struct tomoyo_page_dump".
+ *
+ * Returns the contents of @bprm on success, NULL otherwise.
+ *
+ * This function uses kzalloc(), so caller must kfree() if this function
+ * didn't return NULL.
+ */
+static char *tomoyo_print_bprm(struct linux_binprm *bprm,
+                               struct tomoyo_page_dump *dump)
+{
+        static const int tomoyo_buffer_len = 4096 * 2;
+        char *buffer = kzalloc(tomoyo_buffer_len, GFP_NOFS);
+        char *cp;
+        char *last_start;
+        int len;
+        unsigned long pos = bprm->p;
+        int offset = pos % PAGE_SIZE;
+        int argv_count = bprm->argc;
+        int envp_count = bprm->envc;
+        bool truncated = false;
+        if (!buffer)
+                return NULL;
+        len = snprintf(buffer, tomoyo_buffer_len - 1, "argv[]={ ");
+        cp = buffer + len;
+        if (!argv_count) {
+                memmove(cp, "} envp[]={ ", 11);
+                cp += 11;
+        }
+        last_start = cp;
+        while (argv_count || envp_count) {
+                if (!tomoyo_dump_page(bprm, pos, dump))
+                        goto out;
+                pos += PAGE_SIZE - offset;
+                /* Read. */
+                while (offset < PAGE_SIZE) {
+                        const char *kaddr = dump->data;
+                        const unsigned char c = kaddr[offset++];
+                        if (cp == last_start)
+                                *cp++ = '"';
+                        if (cp >= buffer + tomoyo_buffer_len - 32) {
+                                /* Reserve some room for "..." string. */
+                                truncated = true;
+                        } else if (c == '\\') {
+                                *cp++ = '\\';
+                                *cp++ = '\\';
+                        } else if (c > ' ' && c < 127) {
+                                *cp++ = c;
+                        } else if (!c) {
+                                *cp++ = '"';
+                                *cp++ = ' ';
+                                last_start = cp;
+                        } else {
+                                *cp++ = '\\';
+                                *cp++ = (c >> 6) + '0';
+                                *cp++ = ((c >> 3) & 7) + '0';
+                                *cp++ = (c & 7) + '0';
+                        }
+                        if (c)
+                                continue;
+                        if (argv_count) {
+                                if (--argv_count == 0) {
+                                        if (truncated) {
+                                                cp = last_start;
+                                                memmove(cp, "... ", 4);
+                                                cp += 4;
+                                        }
+                                        memmove(cp, "} envp[]={ ", 11);
+                                        cp += 11;
+                                        last_start = cp;
+                                        truncated = false;
+                                }
+                        } else if (envp_count) {
+                                if (--envp_count == 0) {
+                                        if (truncated) {
+                                                cp = last_start;
+                                                memmove(cp, "... ", 4);
+                                                cp += 4;
+                                        }
+                                }
+                        }
+                        if (!argv_count && !envp_count)
+                                break;
+                }
+                offset = 0;
+        }
+        *cp++ = '}';
+        *cp = '\0';
+        return buffer;
+out:
+        snprintf(buffer, tomoyo_buffer_len - 1,
+                 "argv[]={ ... } envp[]= { ... }");
+        return buffer;
+}
+
+/**
+ * tomoyo_filetype - Get string representation of file type.
+ *
+ * @mode: Mode value for stat().
+ *
+ * Returns file type string.
+ */
+static inline const char *tomoyo_filetype(const mode_t mode)
+{
+        switch (mode & S_IFMT) {
+        case S_IFREG:
+        case 0:
+                return tomoyo_condition_keyword[TOMOYO_TYPE_IS_FILE];
+        case S_IFDIR:
+                return tomoyo_condition_keyword[TOMOYO_TYPE_IS_DIRECTORY];
+        case S_IFLNK:
+                return tomoyo_condition_keyword[TOMOYO_TYPE_IS_SYMLINK];
+        case S_IFIFO:
+                return tomoyo_condition_keyword[TOMOYO_TYPE_IS_FIFO];
+        case S_IFSOCK:
+                return tomoyo_condition_keyword[TOMOYO_TYPE_IS_SOCKET];
+        case S_IFBLK:
+                return tomoyo_condition_keyword[TOMOYO_TYPE_IS_BLOCK_DEV];
+        case S_IFCHR:
+                return tomoyo_condition_keyword[TOMOYO_TYPE_IS_CHAR_DEV];
+        }
+        return "unknown"; /* This should not happen. */
+}
+
+/**
+ * tomoyo_print_header - Get header line of audit log.
+ *
+ * @r: Pointer to "struct tomoyo_request_info".
+ *
+ * Returns string representation.
+ *
+ * This function uses kmalloc(), so caller must kfree() if this function
+ * didn't return NULL.
+ */
+static char *tomoyo_print_header(struct tomoyo_request_info *r)
+{
+        struct tomoyo_time stamp;
+        const pid_t gpid = task_pid_nr(current);
+        struct tomoyo_obj_info *obj = r->obj;
+        static const int tomoyo_buffer_len = 4096;
+        char *buffer = kmalloc(tomoyo_buffer_len, GFP_NOFS);
+        int pos;
+        u8 i;
+        if (!buffer)
+                return NULL;
+        {
+                struct timeval tv;
+                do_gettimeofday(&tv);
+                tomoyo_convert_time(tv.tv_sec, &stamp);
+        }
+        pos = snprintf(buffer, tomoyo_buffer_len - 1,
+                       "#%04u/%02u/%02u %02u:%02u:%02u# profile=%u mode=%s "
+                       "granted=%s (global-pid=%u) task={ pid=%u ppid=%u "
+                       "uid=%u gid=%u euid=%u egid=%u suid=%u sgid=%u "
+                       "fsuid=%u fsgid=%u }", stamp.year, stamp.month,
+                       stamp.day, stamp.hour, stamp.min, stamp.sec, r->profile,
+                       tomoyo_mode[r->mode], tomoyo_yesno(r->granted), gpid,
+                       tomoyo_sys_getpid(), tomoyo_sys_getppid(),
+                       current_uid(), current_gid(), current_euid(),
+                       current_egid(), current_suid(), current_sgid(),
+                       current_fsuid(), current_fsgid());
+        if (!obj)
+                goto no_obj_info;
+        if (!obj->validate_done) {
+                tomoyo_get_attributes(obj);
+                obj->validate_done = true;
+        }
+        for (i = 0; i < TOMOYO_MAX_PATH_STAT; i++) {
+                struct tomoyo_mini_stat *stat;
+                unsigned int dev;
+                mode_t mode;
+                if (!obj->stat_valid[i])
+                        continue;
+                stat = &obj->stat[i];
+                dev = stat->dev;
+                mode = stat->mode;
+                if (i & 1) {
+                        pos += snprintf(buffer + pos,
+                                        tomoyo_buffer_len - 1 - pos,
+                                        " path%u.parent={ uid=%u gid=%u "
+                                        "ino=%lu perm=0%o }", (i >> 1) + 1,
+                                        stat->uid, stat->gid, (unsigned long)
+                                        stat->ino, stat->mode & S_IALLUGO);
+                        continue;
+                }
+                pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos,
+                                " path%u={ uid=%u gid=%u ino=%lu major=%u"
+                                " minor=%u perm=0%o type=%s", (i >> 1) + 1,
+                                stat->uid, stat->gid, (unsigned long)
+                                stat->ino, MAJOR(dev), MINOR(dev),
+                                mode & S_IALLUGO, tomoyo_filetype(mode));
+                if (S_ISCHR(mode) || S_ISBLK(mode)) {
+                        dev = stat->rdev;
+                        pos += snprintf(buffer + pos,
+                                        tomoyo_buffer_len - 1 - pos,
+                                        " dev_major=%u dev_minor=%u",
+                                        MAJOR(dev), MINOR(dev));
+                }
+                pos += snprintf(buffer + pos, tomoyo_buffer_len - 1 - pos,
+                                " }");
+        }
+no_obj_info:
+        if (pos < tomoyo_buffer_len - 1)
+                return buffer;
+        kfree(buffer);
+        return NULL;
+}
+
+/**
+ * tomoyo_init_log - Allocate buffer for audit logs.
+ *
+ * @r:    Pointer to "struct tomoyo_request_info".
+ * @len:  Buffer size needed for @fmt and @args.
+ * @fmt:  The printf()'s format string.
+ * @args: va_list structure for @fmt.
+ *
+ * Returns pointer to allocated memory.
+ *
+ * This function uses kzalloc(), so caller must kfree() if this function
+ * didn't return NULL.
+ */
+char *tomoyo_init_log(struct tomoyo_request_info *r, int len, const char *fmt,
+                      va_list args)
+{
+        char *buf = NULL;
+        char *bprm_info = NULL;
+        const char *header = NULL;
+        char *realpath = NULL;
+        const char *symlink = NULL;
+        int pos;
+        const char *domainname = r->domain->domainname->name;
+        header = tomoyo_print_header(r);
+        if (!header)
+                return NULL;
+        /* +10 is for '\n' etc. and '\0'. */
+        len += strlen(domainname) + strlen(header) + 10;
+        if (r->ee) {
+                struct file *file = r->ee->bprm->file;
+                realpath = tomoyo_realpath_from_path(&file->f_path);
+                bprm_info = tomoyo_print_bprm(r->ee->bprm, &r->ee->dump);
+                if (!realpath || !bprm_info)
+                        goto out;
+                /* +80 is for " exec={ realpath=\"%s\" argc=%d envc=%d %s }" */
+                len += strlen(realpath) + 80 + strlen(bprm_info);
+        } else if (r->obj && r->obj->symlink_target) {
+                symlink = r->obj->symlink_target->name;
+                /* +18 is for " symlink.target=\"%s\"" */
+                len += 18 + strlen(symlink);
+        }
+        len = tomoyo_round2(len);
+        buf = kzalloc(len, GFP_NOFS);
+        if (!buf)
+                goto out;
+        len--;
+        pos = snprintf(buf, len, "%s", header);
+        if (realpath) {
+                struct linux_binprm *bprm = r->ee->bprm;
+                pos += snprintf(buf + pos, len - pos,
+                                " exec={ realpath=\"%s\" argc=%d envc=%d %s }",
+                                realpath, bprm->argc, bprm->envc, bprm_info);
+        } else if (symlink)
+                pos += snprintf(buf + pos, len - pos, " symlink.target=\"%s\"",
+                                symlink);
+        pos += snprintf(buf + pos, len - pos, "\n%s\n", domainname);
+        vsnprintf(buf + pos, len - pos, fmt, args);
+out:
+        kfree(realpath);
+        kfree(bprm_info);
+        kfree(header);
+        return buf;
+}
+
+/* Wait queue for /sys/kernel/security/tomoyo/audit. */
+static DECLARE_WAIT_QUEUE_HEAD(tomoyo_log_wait);
+
+/* Structure for audit log. */
+struct tomoyo_log {
+        struct list_head list;
+        char *log;
+        int size;
+};
+
+/* The list for "struct tomoyo_log". */
+static LIST_HEAD(tomoyo_log);
+
+/* Lock for "struct list_head tomoyo_log". */
+static DEFINE_SPINLOCK(tomoyo_log_lock);
+
+/* Length of "stuct list_head tomoyo_log". */
+static unsigned int tomoyo_log_count;
+
+/**
+ * tomoyo_get_audit - Get audit mode.
+ *
+ * @ns:          Pointer to "struct tomoyo_policy_namespace".
+ * @profile:     Profile number.
+ * @index:       Index number of functionality.
+ * @is_granted:  True if granted log, false otherwise.
+ *
+ * Returns true if this request should be audited, false otherwise.
+ */
+static bool tomoyo_get_audit(const struct tomoyo_policy_namespace *ns,
+                             const u8 profile, const u8 index,
+                             const bool is_granted)
+{
+        u8 mode;
+        const u8 category = tomoyo_index2category[index] +
+                TOMOYO_MAX_MAC_INDEX;
+        struct tomoyo_profile *p;
+        if (!tomoyo_policy_loaded)
+                return false;
+        p = tomoyo_profile(ns, profile);
+        if (tomoyo_log_count >= p->pref[TOMOYO_PREF_MAX_AUDIT_LOG])
+                return false;
+        mode = p->config[index];
+        if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+                mode = p->config[category];
+        if (mode == TOMOYO_CONFIG_USE_DEFAULT)
+                mode = p->default_config;
+        if (is_granted)
+                return mode & TOMOYO_CONFIG_WANT_GRANT_LOG;
+        return mode & TOMOYO_CONFIG_WANT_REJECT_LOG;
+}
+
+/**
+ * tomoyo_write_log2 - Write an audit log.
+ *
+ * @r:    Pointer to "struct tomoyo_request_info".
+ * @len:  Buffer size needed for @fmt and @args.
+ * @fmt:  The printf()'s format string.
+ * @args: va_list structure for @fmt.
+ *
+ * Returns nothing.
+ */
+void tomoyo_write_log2(struct tomoyo_request_info *r, int len, const char *fmt,
+                       va_list args)
+{
+        char *buf;
+        struct tomoyo_log *entry;
+        bool quota_exceeded = false;
+        if (!tomoyo_get_audit(r->domain->ns, r->profile, r->type, r->granted))
+                goto out;
+        buf = tomoyo_init_log(r, len, fmt, args);
+        if (!buf)
+                goto out;
+        entry = kzalloc(sizeof(*entry), GFP_NOFS);
+        if (!entry) {
+                kfree(buf);
+                goto out;
+        }
+        entry->log = buf;
+        len = tomoyo_round2(strlen(buf) + 1);
+        /*
+         * The entry->size is used for memory quota checks.
+         * Don't go beyond strlen(entry->log).
+         */
+        entry->size = len + tomoyo_round2(sizeof(*entry));
+        spin_lock(&tomoyo_log_lock);
+        if (tomoyo_memory_quota[TOMOYO_MEMORY_AUDIT] &&
+            tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] + entry->size >=
+            tomoyo_memory_quota[TOMOYO_MEMORY_AUDIT]) {
+                quota_exceeded = true;
+        } else {
+                tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] += entry->size;
+                list_add_tail(&entry->list, &tomoyo_log);
+                tomoyo_log_count++;
+        }
+        spin_unlock(&tomoyo_log_lock);
+        if (quota_exceeded) {
+                kfree(buf);
+                kfree(entry);
+                goto out;
+        }
+        wake_up(&tomoyo_log_wait);
+out:
+        return;
+}
+
+/**
+ * tomoyo_write_log - Write an audit log.
+ *
+ * @r:   Pointer to "struct tomoyo_request_info".
+ * @fmt: The printf()'s format string, followed by parameters.
+ *
+ * Returns nothing.
+ */
+void tomoyo_write_log(struct tomoyo_request_info *r, const char *fmt, ...)
+{
+        va_list args;
+        int len;
+        va_start(args, fmt);
+        len = vsnprintf((char *) &len, 1, fmt, args) + 1;
+        va_end(args);
+        va_start(args, fmt);
+        tomoyo_write_log2(r, len, fmt, args);
+        va_end(args);
+}
+
+/**
+ * tomoyo_read_log - Read an audit log.
+ *
+ * @head: Pointer to "struct tomoyo_io_buffer".
+ *
+ * Returns nothing.
+ */
+void tomoyo_read_log(struct tomoyo_io_buffer *head)
+{
+        struct tomoyo_log *ptr = NULL;
+        if (head->r.w_pos)
+                return;
+        kfree(head->read_buf);
+        head->read_buf = NULL;
+        spin_lock(&tomoyo_log_lock);
+        if (!list_empty(&tomoyo_log)) {
+                ptr = list_entry(tomoyo_log.next, typeof(*ptr), list);
+                list_del(&ptr->list);
+                tomoyo_log_count--;
+                tomoyo_memory_used[TOMOYO_MEMORY_AUDIT] -= ptr->size;
+        }
+        spin_unlock(&tomoyo_log_lock);
+        if (ptr) {
+                head->read_buf = ptr->log;
+                head->r.w[head->r.w_pos++] = head->read_buf;
+                kfree(ptr);
+        }
+}
+
+/**
+ * tomoyo_poll_log - Wait for an audit log.
+ *
+ * @file: Pointer to "struct file".
+ * @wait: Pointer to "poll_table".
+ *
+ * Returns POLLIN | POLLRDNORM when ready to read an audit log.
+ */
+int tomoyo_poll_log(struct file *file, poll_table *wait)
+{
+        if (tomoyo_log_count)
+                return POLLIN | POLLRDNORM;
+        poll_wait(file, &tomoyo_log_wait, wait);
+        if (tomoyo_log_count)
+                return POLLIN | POLLRDNORM;
+        return 0;
+}