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Annotation of embedaddon/sudo/plugins/sample_group/sample_group.c, revision 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: };