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: };
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