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Annotation of embedaddon/sudo/plugins/sample_group/sample_group.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 <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 */
                     32: #ifdef HAVE_STRING_H
                     33: # if defined(HAVE_MEMORY_H) && !defined(STDC_HEADERS)
                     34: #  include <memory.h>
                     35: # endif
                     36: # include <string.h>
                     37: #endif /* HAVE_STRING_H */
                     38: #ifdef HAVE_STRINGS_H
                     39: # include <strings.h>
                     40: #endif /* HAVE_STRINGS_H */
                     41: #ifdef HAVE_UNISTD_H
                     42: # include <unistd.h>
                     43: #endif /* HAVE_UNISTD_H */
                     44: #include <ctype.h>
                     45: #include <errno.h>
                     46: #include <fcntl.h>
                     47: #include <limits.h>
                     48: #include <grp.h>
                     49: #include <pwd.h>
                     50: 
                     51: #include "sudo_plugin.h"
                     52: #include "missing.h"
                     53: 
                     54: /*
                     55:  * Sample sudoers group plugin that uses an extra group file with the
                     56:  * same format as /etc/group.
                     57:  */
                     58: 
                     59: #undef TRUE
                     60: #define TRUE 1
                     61: #undef FALSE
                     62: #define FALSE 0
                     63: #undef ERROR
                     64: #define ERROR -1
                     65: 
                     66: static sudo_printf_t sudo_log;
                     67: 
                     68: extern void mysetgrfile(const char *);
                     69: extern void mysetgrent(void);
                     70: extern void myendgrent(void);
                     71: extern struct group *mygetgrnam(const char *);
                     72: 
                     73: static int
                     74: sample_init(int version, sudo_printf_t sudo_printf, char *const argv[])
                     75: {
                     76:     struct stat sb;
                     77: 
                     78:     sudo_log = sudo_printf;
                     79: 
                     80:     if (GROUP_API_VERSION_GET_MAJOR(version) != GROUP_API_VERSION_MAJOR) {
                     81:        sudo_log(SUDO_CONV_ERROR_MSG,
                     82:            "sample_group: incompatible major version %d, expected %d\n",
                     83:            GROUP_API_VERSION_GET_MAJOR(version),
                     84:            GROUP_API_VERSION_MAJOR);
                     85:        return ERROR;
                     86:     }
                     87: 
                     88:     /* Sanity check the specified group file. */
                     89:     if (argv == NULL || argv[0] == NULL) {
                     90:        sudo_log(SUDO_CONV_ERROR_MSG,
                     91:            "sample_group: path to group file not specified\n");
                     92:        return ERROR;
                     93:     }
                     94:     if (stat(argv[0], &sb) != 0) {
                     95:        sudo_log(SUDO_CONV_ERROR_MSG,
                     96:            "sample_group: %s: %s\n", argv[0], strerror(errno));
                     97:        return ERROR;
                     98:     }
                     99:     if ((sb.st_mode & (S_IWGRP|S_IWOTH)) != 0) {
                    100:        sudo_log(SUDO_CONV_ERROR_MSG,
                    101:            "%s must be only be writable by owner\n", argv[0]);
                    102:        return ERROR;
                    103:     }
                    104: 
                    105:     mysetgrfile(argv[0]);
                    106:     mysetgrent();
                    107: 
                    108:     return TRUE;
                    109: }
                    110: 
                    111: static void
                    112: sample_cleanup(void)
                    113: {
                    114:     myendgrent();
                    115: }
                    116: 
                    117: /*
                    118:  * Returns TRUE if "user" is a member of "group", else FALSE.
                    119:  */
                    120: static int
                    121: sample_query(const char *user, const char *group, const struct passwd *pwd)
                    122: {
                    123:     struct group *grp;
                    124:     char **member;
                    125: 
                    126:     grp = mygetgrnam(group);
                    127:     if (grp != NULL) {
                    128:        for (member = grp->gr_mem; *member != NULL; member++) {
                    129:            if (strcasecmp(user, *member) == 0)
                    130:                return TRUE;
                    131:        }
                    132:     }
                    133: 
                    134:     return FALSE;
                    135: }
                    136: 
                    137: struct sudoers_group_plugin group_plugin = {
                    138:     GROUP_API_VERSION,
                    139:     sample_init,
                    140:     sample_cleanup,
                    141:     sample_query
                    142: };