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Annotation of embedaddon/sudo/plugins/group_file/group_file.c, revision 1.1.1.2

1.1       misho       1: /*
1.1.1.2 ! misho       2:  * Copyright (c) 2010-2014 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 <sys/stat.h>
                     21: 
                     22: #include <stdio.h>
                     23: #ifdef STDC_HEADERS
                     24: # include <stdlib.h>
                     25: # include <stddef.h>
                     26: #else
                     27: # ifdef HAVE_STDLIB_H
                     28: #  include <stdlib.h>
                     29: # endif
                     30: #endif /* STDC_HEADERS */
                     31: #ifdef HAVE_STDBOOL_H
                     32: # include <stdbool.h>
                     33: #else
                     34: # include "compat/stdbool.h"
                     35: #endif /* HAVE_STDBOOL_H */
                     36: #ifdef HAVE_STRING_H
                     37: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
                     38: #  include <memory.h>
                     39: # endif
                     40: # include <string.h>
                     41: #endif /* HAVE_STRING_H */
                     42: #ifdef HAVE_STRINGS_H
                     43: # include <strings.h>
                     44: #endif /* HAVE_STRINGS_H */
                     45: #ifdef HAVE_UNISTD_H
                     46: # include <unistd.h>
                     47: #endif /* HAVE_UNISTD_H */
                     48: #include <ctype.h>
                     49: #include <errno.h>
                     50: #include <fcntl.h>
                     51: #include <limits.h>
                     52: #include <grp.h>
                     53: #include <pwd.h>
                     54: 
                     55: #include "sudo_plugin.h"
                     56: #include "missing.h"
                     57: 
                     58: /*
                     59:  * Sample sudoers group plugin that uses an extra group file with the
                     60:  * same format as /etc/group.
                     61:  */
                     62: 
                     63: static sudo_printf_t sudo_log;
                     64: 
                     65: extern void mysetgrfile(const char *);
                     66: extern void mysetgrent(void);
                     67: extern void myendgrent(void);
                     68: extern struct group *mygetgrnam(const char *);
                     69: 
                     70: static int
                     71: sample_init(int version, sudo_printf_t sudo_printf, char *const argv[])
                     72: {
                     73:     struct stat sb;
                     74: 
                     75:     sudo_log = sudo_printf;
                     76: 
                     77:     if (GROUP_API_VERSION_GET_MAJOR(version) != GROUP_API_VERSION_MAJOR) {
                     78:        sudo_log(SUDO_CONV_ERROR_MSG,
                     79:            "group_file: incompatible major version %d, expected %d\n",
                     80:            GROUP_API_VERSION_GET_MAJOR(version),
                     81:            GROUP_API_VERSION_MAJOR);
                     82:        return -1;
                     83:     }
                     84: 
                     85:     /* Sanity check the specified group file. */
                     86:     if (argv == NULL || argv[0] == NULL) {
                     87:        sudo_log(SUDO_CONV_ERROR_MSG,
                     88:            "group_file: path to group file not specified\n");
                     89:        return -1;
                     90:     }
                     91:     if (stat(argv[0], &sb) != 0) {
                     92:        sudo_log(SUDO_CONV_ERROR_MSG,
                     93:            "group_file: %s: %s\n", argv[0], strerror(errno));
                     94:        return -1;
                     95:     }
                     96:     if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {
                     97:        sudo_log(SUDO_CONV_ERROR_MSG,
                     98:            "%s must be only be writable by owner\n", argv[0]);
                     99:        return -1;
                    100:     }
                    101: 
                    102:     mysetgrfile(argv[0]);
                    103:     mysetgrent();
                    104: 
                    105:     return true;
                    106: }
                    107: 
                    108: static void
                    109: sample_cleanup(void)
                    110: {
                    111:     myendgrent();
                    112: }
                    113: 
                    114: /*
                    115:  * Returns true if "user" is a member of "group", else false.
                    116:  */
                    117: static int
                    118: sample_query(const char *user, const char *group, const struct passwd *pwd)
                    119: {
                    120:     struct group *grp;
                    121:     char **member;
                    122: 
                    123:     grp = mygetgrnam(group);
1.1.1.2 ! misho     124:     if (grp != NULL && grp->gr_mem != NULL) {
1.1       misho     125:        for (member = grp->gr_mem; *member != NULL; member++) {
                    126:            if (strcasecmp(user, *member) == 0)
                    127:                return true;
                    128:        }
                    129:     }
                    130: 
                    131:     return false;
                    132: }
                    133: 
                    134: __dso_public struct sudoers_group_plugin group_plugin = {
                    135:     GROUP_API_VERSION,
                    136:     sample_init,
                    137:     sample_cleanup,
                    138:     sample_query
                    139: };