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

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: 
1.1.1.2 ! misho     117:     handle = dlsym(RTLD_DEFAULT, "sudo_gr_delref");
1.1       misho     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: };