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Annotation of embedaddon/sudo/plugins/sudoers/linux_audit.c, revision 1.1.1.1

1.1       misho       1: /*
                      2:  * Copyright (c) 2010 Todd C. Miller <Todd.Miller@courtesan.com>
                      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"
                     38: #include "linux_audit.h"
                     39: 
                     40: /*
                     41:  * Open audit connection if possible.
                     42:  * Returns audit fd on success and -1 on failure.
                     43:  */
                     44: static int
                     45: linux_audit_open(void)
                     46: {
                     47:     static int au_fd = -1;
                     48: 
                     49:     if (au_fd != -1)
                     50:        return au_fd;
                     51:     au_fd = audit_open();
                     52:     if (au_fd == -1) {
                     53:        /* Kernel may not have audit support. */
                     54:        if (errno != EINVAL && errno != EPROTONOSUPPORT && errno != EAFNOSUPPORT)
                     55:            error(1, _("unable to open audit system"));
                     56:     } else {
                     57:        (void)fcntl(au_fd, F_SETFD, FD_CLOEXEC);
                     58:     }
                     59:     return au_fd;
                     60: }
                     61: 
                     62: int
                     63: linux_audit_command(char *argv[], int result)
                     64: {
                     65:     int au_fd, rc;
                     66:     char *command, *cp, **av;
                     67:     size_t size, n;
                     68: 
                     69:     if ((au_fd = linux_audit_open()) == -1)
                     70:        return -1;
                     71: 
                     72:     /* Convert argv to a flat string. */
                     73:     for (size = 0, av = argv; *av != NULL; av++)
                     74:        size += strlen(*av) + 1;
                     75:     command = cp = emalloc(size);
                     76:     for (av = argv; *av != NULL; av++) {
                     77:        n = strlcpy(cp, *av, size - (cp - command));
                     78:        if (n >= size - (cp - command))
                     79:            errorx(1, _("internal error, linux_audit_command() overflow"));
                     80:        cp += n;
                     81:        *cp++ = ' ';
                     82:     }
                     83:     *--cp = '\0';
                     84: 
                     85:     /* Log command, ignoring ECONNREFUSED on error. */
                     86:     rc = audit_log_user_command(au_fd, AUDIT_USER_CMD, command, NULL, result);
                     87:     if (rc <= 0 && errno != ECONNREFUSED)
                     88:        warning(_("unable to send audit message"));
                     89: 
                     90:     efree(command);
                     91: 
                     92:     return rc;
                     93: }