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Annotation of embedaddon/sudo/plugins/sudoers/linux_audit.c, revision 1.1.1.4

1.1       misho       1: /*
1.1.1.4 ! misho       2:  * Copyright (c) 2010-2013 Todd C. Miller <Todd.Miller@courtesan.com>
1.1       misho       3:  *
                      4:  * Permission to use, copy, modify, and distribute this software for any
                      5:  * purpose with or without fee is hereby granted, provided that the above
                      6:  * copyright notice and this permission notice appear in all copies.
                      7:  *
                      8:  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
                      9:  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
                     10:  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
                     11:  * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
                     12:  * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
                     13:  * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
                     14:  * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
                     15:  */
                     16: 
                     17: #include <config.h>
                     18: 
                     19: #include <sys/types.h>
                     20: #include <stdio.h>
                     21: #ifdef STDC_HEADERS
                     22: # include <stdlib.h>
                     23: # include <stddef.h>
                     24: #else
                     25: # ifdef HAVE_STDLIB_H
                     26: #  include <stdlib.h>
                     27: # endif
                     28: #endif /* STDC_HEADERS */
                     29: #include <errno.h>
                     30: #include <fcntl.h>
                     31: #include <string.h>
                     32: #include <libaudit.h>
                     33: 
                     34: #include "missing.h"
                     35: #include "error.h"
                     36: #include "alloc.h"
                     37: #include "gettext.h"
1.1.1.2   misho      38: #include "sudo_debug.h"
1.1       misho      39: #include "linux_audit.h"
                     40: 
                     41: /*
                     42:  * Open audit connection if possible.
                     43:  * Returns audit fd on success and -1 on failure.
                     44:  */
1.1.1.2   misho      45: int
                     46: static linux_audit_open(void)
1.1       misho      47: {
                     48:     static int au_fd = -1;
1.1.1.2   misho      49:     debug_decl(linux_audit_open, SUDO_DEBUG_AUDIT)
1.1       misho      50: 
                     51:     if (au_fd != -1)
1.1.1.2   misho      52:        debug_return_int(au_fd);
1.1       misho      53:     au_fd = audit_open();
                     54:     if (au_fd == -1) {
                     55:        /* Kernel may not have audit support. */
                     56:        if (errno != EINVAL && errno != EPROTONOSUPPORT && errno != EAFNOSUPPORT)
1.1.1.4 ! misho      57:            fatal(_("unable to open audit system"));
1.1       misho      58:     } else {
                     59:        (void)fcntl(au_fd, F_SETFD, FD_CLOEXEC);
                     60:     }
1.1.1.2   misho      61:     debug_return_int(au_fd);
1.1       misho      62: }
                     63: 
                     64: int
                     65: linux_audit_command(char *argv[], int result)
                     66: {
                     67:     int au_fd, rc;
                     68:     char *command, *cp, **av;
                     69:     size_t size, n;
1.1.1.2   misho      70:     debug_decl(linux_audit_command, SUDO_DEBUG_AUDIT)
1.1       misho      71: 
                     72:     if ((au_fd = linux_audit_open()) == -1)
1.1.1.2   misho      73:        debug_return_int(-1);
1.1       misho      74: 
                     75:     /* Convert argv to a flat string. */
                     76:     for (size = 0, av = argv; *av != NULL; av++)
                     77:        size += strlen(*av) + 1;
                     78:     command = cp = emalloc(size);
                     79:     for (av = argv; *av != NULL; av++) {
                     80:        n = strlcpy(cp, *av, size - (cp - command));
1.1.1.3   misho      81:        if (n >= size - (cp - command)) {
1.1.1.4 ! misho      82:            fatalx(_("internal error, %s overflow"),
1.1.1.3   misho      83:                "linux_audit_command()");
                     84:        }
1.1       misho      85:        cp += n;
                     86:        *cp++ = ' ';
                     87:     }
                     88:     *--cp = '\0';
                     89: 
                     90:     /* Log command, ignoring ECONNREFUSED on error. */
                     91:     rc = audit_log_user_command(au_fd, AUDIT_USER_CMD, command, NULL, result);
                     92:     if (rc <= 0 && errno != ECONNREFUSED)
                     93:        warning(_("unable to send audit message"));
                     94: 
                     95:     efree(command);
                     96: 
1.1.1.2   misho      97:     debug_return_int(rc);
1.1       misho      98: }