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

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 <sys/param.h>
                     21: #include <sys/stat.h>
                     22: 
                     23: #include <stdio.h>
                     24: #ifdef STDC_HEADERS
                     25: # include <stdlib.h>
                     26: # include <stddef.h>
                     27: #else
                     28: # ifdef HAVE_STDLIB_H
                     29: #  include <stdlib.h>
                     30: # endif
                     31: #endif /* STDC_HEADERS */
1.1.1.2 ! misho      32: #ifdef HAVE_STDBOOL_H
        !            33: # include <stdbool.h>
        !            34: #else
        !            35: # include "compat/stdbool.h"
        !            36: #endif /* HAVE_STDBOOL_H */
1.1       misho      37: #ifdef HAVE_STRING_H
                     38: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
                     39: #  include <memory.h>
                     40: # endif
                     41: # include <string.h>
                     42: #endif /* HAVE_STRING_H */
                     43: #ifdef HAVE_STRINGS_H
                     44: # include <strings.h>
                     45: #endif /* HAVE_STRINGS_H */
                     46: #ifdef HAVE_UNISTD_H
                     47: # include <unistd.h>
                     48: #endif /* HAVE_UNISTD_H */
                     49: #include <ctype.h>
                     50: #include <errno.h>
                     51: #include <fcntl.h>
                     52: #include <limits.h>
                     53: #include <grp.h>
                     54: #include <pwd.h>
                     55: 
                     56: #include "sudo_plugin.h"
                     57: #include "missing.h"
                     58: 
                     59: /*
                     60:  * Sample sudoers group plugin that uses an extra group file with the
                     61:  * same format as /etc/group.
                     62:  */
                     63: 
                     64: static sudo_printf_t sudo_log;
                     65: 
                     66: extern void mysetgrfile(const char *);
                     67: extern void mysetgrent(void);
                     68: extern void myendgrent(void);
                     69: extern struct group *mygetgrnam(const char *);
                     70: 
                     71: static int
                     72: sample_init(int version, sudo_printf_t sudo_printf, char *const argv[])
                     73: {
                     74:     struct stat sb;
                     75: 
                     76:     sudo_log = sudo_printf;
                     77: 
                     78:     if (GROUP_API_VERSION_GET_MAJOR(version) != GROUP_API_VERSION_MAJOR) {
                     79:        sudo_log(SUDO_CONV_ERROR_MSG,
                     80:            "sample_group: incompatible major version %d, expected %d\n",
                     81:            GROUP_API_VERSION_GET_MAJOR(version),
                     82:            GROUP_API_VERSION_MAJOR);
1.1.1.2 ! misho      83:        return -1;
1.1       misho      84:     }
                     85: 
                     86:     /* Sanity check the specified group file. */
                     87:     if (argv == NULL || argv[0] == NULL) {
                     88:        sudo_log(SUDO_CONV_ERROR_MSG,
                     89:            "sample_group: path to group file not specified\n");
1.1.1.2 ! misho      90:        return -1;
1.1       misho      91:     }
                     92:     if (stat(argv[0], &sb) != 0) {
                     93:        sudo_log(SUDO_CONV_ERROR_MSG,
                     94:            "sample_group: %s: %s\n", argv[0], strerror(errno));
1.1.1.2 ! misho      95:        return -1;
1.1       misho      96:     }
                     97:     if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {
                     98:        sudo_log(SUDO_CONV_ERROR_MSG,
                     99:            "%s must be only be writable by owner\n", argv[0]);
1.1.1.2 ! misho     100:        return -1;
1.1       misho     101:     }
                    102: 
                    103:     mysetgrfile(argv[0]);
                    104:     mysetgrent();
                    105: 
1.1.1.2 ! misho     106:     return true;
1.1       misho     107: }
                    108: 
                    109: static void
                    110: sample_cleanup(void)
                    111: {
                    112:     myendgrent();
                    113: }
                    114: 
                    115: /*
1.1.1.2 ! misho     116:  * Returns true if "user" is a member of "group", else false.
1.1       misho     117:  */
                    118: static int
                    119: sample_query(const char *user, const char *group, const struct passwd *pwd)
                    120: {
                    121:     struct group *grp;
                    122:     char **member;
                    123: 
                    124:     grp = mygetgrnam(group);
                    125:     if (grp != NULL) {
                    126:        for (member = grp->gr_mem; *member != NULL; member++) {
                    127:            if (strcasecmp(user, *member) == 0)
1.1.1.2 ! misho     128:                return true;
1.1       misho     129:        }
                    130:     }
                    131: 
1.1.1.2 ! misho     132:     return false;
1.1       misho     133: }
                    134: 
                    135: struct sudoers_group_plugin group_plugin = {
                    136:     GROUP_API_VERSION,
                    137:     sample_init,
                    138:     sample_cleanup,
                    139:     sample_query
                    140: };