Annotation of embedaddon/sudo/plugins/system_group/system_group.c, revision 1.1
1.1 ! misho 1: /*
! 2: * Copyright (c) 2010, 2012 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_STDBOOL_H
! 33: # include <stdbool.h>
! 34: #else
! 35: # include "compat/stdbool.h"
! 36: #endif /* HAVE_STDBOOL_H */
! 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: #ifdef HAVE_DLOPEN
! 50: # include <dlfcn.h>
! 51: #else
! 52: # include "compat/dlfcn.h"
! 53: #endif
! 54: #include <ctype.h>
! 55: #include <errno.h>
! 56: #include <fcntl.h>
! 57: #include <limits.h>
! 58: #include <grp.h>
! 59: #include <pwd.h>
! 60:
! 61: #include "sudo_plugin.h"
! 62: #include "missing.h"
! 63:
! 64: #ifndef RTLD_DEFAULT
! 65: # define RTLD_DEFAULT NULL
! 66: #endif
! 67:
! 68: /*
! 69: * Sudoers group plugin that does group name-based lookups using the system
! 70: * group database functions, similar to how sudo behaved prior to 1.7.3.
! 71: * This can be used on systems where lookups by group ID are problematic.
! 72: */
! 73:
! 74: static sudo_printf_t sudo_log;
! 75:
! 76: typedef struct group * (*sysgroup_getgrnam_t)(const char *);
! 77: typedef struct group * (*sysgroup_getgrgid_t)(gid_t);
! 78: typedef void (*sysgroup_gr_delref_t)(struct group *);
! 79:
! 80: static sysgroup_getgrnam_t sysgroup_getgrnam;
! 81: static sysgroup_getgrgid_t sysgroup_getgrgid;
! 82: static sysgroup_gr_delref_t sysgroup_gr_delref;
! 83: static bool need_setent;
! 84:
! 85: static int
! 86: sysgroup_init(int version, sudo_printf_t sudo_printf, char *const argv[])
! 87: {
! 88: void *handle;
! 89:
! 90: sudo_log = sudo_printf;
! 91:
! 92: if (GROUP_API_VERSION_GET_MAJOR(version) != GROUP_API_VERSION_MAJOR) {
! 93: sudo_log(SUDO_CONV_ERROR_MSG,
! 94: "sysgroup_group: incompatible major version %d, expected %d\n",
! 95: GROUP_API_VERSION_GET_MAJOR(version),
! 96: GROUP_API_VERSION_MAJOR);
! 97: return -1;
! 98: }
! 99:
! 100: /* Share group cache with sudo if possible. */
! 101: handle = dlsym(RTLD_DEFAULT, "sudo_getgrnam");
! 102: if (handle != NULL) {
! 103: sysgroup_getgrnam = (sysgroup_getgrnam_t)handle;
! 104: } else {
! 105: sysgroup_getgrnam = (sysgroup_getgrnam_t)getgrnam;
! 106: need_setent = true;
! 107: }
! 108:
! 109: handle = dlsym(RTLD_DEFAULT, "sudo_getgrgid");
! 110: if (handle != NULL) {
! 111: sysgroup_getgrgid = (sysgroup_getgrgid_t)handle;
! 112: } else {
! 113: sysgroup_getgrgid = (sysgroup_getgrgid_t)getgrgid;
! 114: need_setent = true;
! 115: }
! 116:
! 117: handle = dlsym(RTLD_DEFAULT, "gr_delref");
! 118: if (handle != NULL)
! 119: sysgroup_gr_delref = (sysgroup_gr_delref_t)handle;
! 120:
! 121: if (need_setent)
! 122: setgrent();
! 123:
! 124: return true;
! 125: }
! 126:
! 127: static void
! 128: sysgroup_cleanup(void)
! 129: {
! 130: if (need_setent)
! 131: endgrent();
! 132: }
! 133:
! 134: /*
! 135: * Returns true if "user" is a member of "group", else false.
! 136: */
! 137: static int
! 138: sysgroup_query(const char *user, const char *group, const struct passwd *pwd)
! 139: {
! 140: char **member, *ep = '\0';
! 141: struct group *grp;
! 142:
! 143: grp = sysgroup_getgrnam(group);
! 144: if (grp == NULL && group[0] == '#' && group[1] != '\0') {
! 145: long lval = strtol(group + 1, &ep, 10);
! 146: if (*ep == '\0') {
! 147: if ((lval != LONG_MAX && lval != LONG_MIN) || errno != ERANGE)
! 148: grp = sysgroup_getgrgid((gid_t)lval);
! 149: }
! 150: }
! 151: if (grp != NULL) {
! 152: for (member = grp->gr_mem; *member != NULL; member++) {
! 153: if (strcasecmp(user, *member) == 0) {
! 154: if (sysgroup_gr_delref)
! 155: sysgroup_gr_delref(grp);
! 156: return true;
! 157: }
! 158: }
! 159: if (sysgroup_gr_delref)
! 160: sysgroup_gr_delref(grp);
! 161: }
! 162:
! 163: return false;
! 164: }
! 165:
! 166: struct sudoers_group_plugin group_plugin = {
! 167: GROUP_API_VERSION,
! 168: sysgroup_init,
! 169: sysgroup_cleanup,
! 170: sysgroup_query
! 171: };
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