2b22a6909d
Closes #325 Add a new subid_init() function which can be used to specify the stream on which error messages should be printed. (If you want to get fancy you can redirect that to memory :) If subid_init() is not called, use stderr. If NULL is passed, then /dev/null will be used. This patch also fixes up the 'Prog', which previously had to be defined by any program linking against libsubid. Now, by default in libsubid it will show (subid). Once subid_init() is called, it will use the first variable passed to subid_init(). Signed-off-by: Serge Hallyn <serge@hallyn.com>
354 lines
8.0 KiB
C
354 lines
8.0 KiB
C
/*
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* Copyright (c) 2011 , Julian Pidancet
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* Copyright (c) 2011 , Nicolas François
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the copyright holders or contributors may not be used to
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* endorse or promote products derived from this software without
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* specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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* ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
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* PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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* HOLDERS OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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* SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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* LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include <config.h>
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#ident "$Id$"
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#include <stdio.h>
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#include <assert.h>
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#include "defines.h"
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#include "prototypes.h"
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/*@-exitarg@*/
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#include "exitcodes.h"
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#include "groupio.h"
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#include "pwio.h"
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#ifdef SHADOWGRP
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#include "sgroupio.h"
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#endif
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#include "shadowio.h"
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#ifdef ENABLE_SUBIDS
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#include "subordinateio.h"
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#endif /* ENABLE_SUBIDS */
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#include "getdef.h"
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static char *passwd_db_file = NULL;
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static char *spw_db_file = NULL;
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static char *group_db_file = NULL;
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static char *sgroup_db_file = NULL;
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static char *suid_db_file = NULL;
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static char *sgid_db_file = NULL;
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static char *def_conf_file = NULL;
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static FILE* fp_pwent = NULL;
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static FILE* fp_grent = NULL;
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/*
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* process_prefix_flag - prefix all paths if given the --prefix option
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*
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* This shall be called before accessing the passwd, group, shadow,
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* gshadow, useradd's default, login.defs files (non exhaustive list)
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* or authenticating the caller.
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*
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* The audit, syslog, or locale files shall be open before
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*/
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extern const char* process_prefix_flag (const char* short_opt, int argc, char **argv)
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{
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/*
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* Parse the command line options.
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*/
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int i;
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const char *prefix = NULL, *val;
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for (i = 0; i < argc; i++) {
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val = NULL;
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if ( (strcmp (argv[i], "--prefix") == 0)
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|| ((strncmp (argv[i], "--prefix=", 9) == 0)
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&& (val = argv[i] + 9))
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|| (strcmp (argv[i], short_opt) == 0)) {
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if (NULL != prefix) {
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fprintf (shadow_logfd,
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_("%s: multiple --prefix options\n"),
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Prog);
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exit (E_BAD_ARG);
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}
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if (val) {
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prefix = val;
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} else if (i + 1 == argc) {
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fprintf (shadow_logfd,
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_("%s: option '%s' requires an argument\n"),
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Prog, argv[i]);
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exit (E_BAD_ARG);
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} else {
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prefix = argv[++ i];
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}
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}
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}
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if (prefix != NULL) {
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if ( prefix[0] == '\0' || !strcmp(prefix, "/"))
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return ""; /* if prefix is "/" then we ignore the flag option */
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/* should we prevent symbolic link from being used as a prefix? */
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size_t len;
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len = strlen(prefix) + strlen(PASSWD_FILE) + 2;
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passwd_db_file = xmalloc(len);
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snprintf(passwd_db_file, len, "%s/%s", prefix, PASSWD_FILE);
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pw_setdbname(passwd_db_file);
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len = strlen(prefix) + strlen(GROUP_FILE) + 2;
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group_db_file = xmalloc(len);
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snprintf(group_db_file, len, "%s/%s", prefix, GROUP_FILE);
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gr_setdbname(group_db_file);
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#ifdef SHADOWGRP
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len = strlen(prefix) + strlen(SGROUP_FILE) + 2;
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sgroup_db_file = xmalloc(len);
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snprintf(sgroup_db_file, len, "%s/%s", prefix, SGROUP_FILE);
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sgr_setdbname(sgroup_db_file);
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#endif
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#ifdef USE_NIS
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__setspNIS(0); /* disable NIS for now, at least until it is properly supporting a "prefix" */
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#endif
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len = strlen(prefix) + strlen(SHADOW_FILE) + 2;
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spw_db_file = xmalloc(len);
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snprintf(spw_db_file, len, "%s/%s", prefix, SHADOW_FILE);
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spw_setdbname(spw_db_file);
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#ifdef ENABLE_SUBIDS
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len = strlen(prefix) + strlen("/etc/subuid") + 2;
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suid_db_file = xmalloc(len);
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snprintf(suid_db_file, len, "%s/%s", prefix, "/etc/subuid");
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sub_uid_setdbname(suid_db_file);
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len = strlen(prefix) + strlen("/etc/subgid") + 2;
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sgid_db_file = xmalloc(len);
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snprintf(sgid_db_file, len, "%s/%s", prefix, "/etc/subgid");
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sub_gid_setdbname(sgid_db_file);
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#endif
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#ifdef USE_ECONF
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setdef_config_file(prefix);
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#else
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len = strlen(prefix) + strlen("/etc/login.defs") + 2;
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def_conf_file = xmalloc(len);
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snprintf(def_conf_file, len, "%s/%s", prefix, "/etc/login.defs");
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setdef_config_file(def_conf_file);
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#endif
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}
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if (prefix == NULL)
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return "";
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return prefix;
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}
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extern struct group *prefix_getgrnam(const char *name)
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{
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if (group_db_file) {
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FILE* fg;
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struct group * grp = NULL;
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fg = fopen(group_db_file, "rt");
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if(!fg)
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return NULL;
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while((grp = fgetgrent(fg)) != NULL) {
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if(!strcmp(name, grp->gr_name))
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break;
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}
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fclose(fg);
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return grp;
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}
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return getgrnam(name);
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}
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extern struct group *prefix_getgrgid(gid_t gid)
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{
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if (group_db_file) {
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FILE* fg;
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struct group * grp = NULL;
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fg = fopen(group_db_file, "rt");
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if(!fg)
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return NULL;
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while((grp = fgetgrent(fg)) != NULL) {
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if(gid == grp->gr_gid)
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break;
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}
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fclose(fg);
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return grp;
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}
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return getgrgid(gid);
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}
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extern struct passwd *prefix_getpwuid(uid_t uid)
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{
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if (passwd_db_file) {
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FILE* fg;
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struct passwd *pwd = NULL;
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fg = fopen(passwd_db_file, "rt");
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if(!fg)
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return NULL;
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while((pwd = fgetpwent(fg)) != NULL) {
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if(uid == pwd->pw_uid)
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break;
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}
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fclose(fg);
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return pwd;
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}
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else {
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return getpwuid(uid);
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}
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}
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extern struct passwd *prefix_getpwnam(const char* name)
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{
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if (passwd_db_file) {
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FILE* fg;
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struct passwd *pwd = NULL;
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fg = fopen(passwd_db_file, "rt");
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if(!fg)
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return NULL;
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while((pwd = fgetpwent(fg)) != NULL) {
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if(!strcmp(name, pwd->pw_name))
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break;
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}
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fclose(fg);
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return pwd;
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}
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else {
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return getpwnam(name);
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}
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}
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extern struct spwd *prefix_getspnam(const char* name)
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{
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if (spw_db_file) {
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FILE* fg;
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struct spwd *sp = NULL;
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fg = fopen(spw_db_file, "rt");
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if(!fg)
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return NULL;
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while((sp = fgetspent(fg)) != NULL) {
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if(!strcmp(name, sp->sp_namp))
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break;
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}
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fclose(fg);
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return sp;
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}
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else {
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return getspnam(name);
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}
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}
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extern void prefix_setpwent()
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{
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if(!passwd_db_file) {
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setpwent();
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return;
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}
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if (fp_pwent)
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fclose (fp_pwent);
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fp_pwent = fopen(passwd_db_file, "rt");
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if(!fp_pwent)
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return;
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}
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extern struct passwd* prefix_getpwent()
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{
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if(!passwd_db_file) {
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return getpwent();
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}
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return fgetpwent(fp_pwent);
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}
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extern void prefix_endpwent()
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{
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if(!passwd_db_file) {
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endpwent();
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return;
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}
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if (fp_pwent)
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fclose(fp_pwent);
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fp_pwent = NULL;
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}
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extern void prefix_setgrent()
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{
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if(!group_db_file) {
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setgrent();
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return;
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}
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if (fp_grent)
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fclose (fp_grent);
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fp_grent = fopen(group_db_file, "rt");
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if(!fp_grent)
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return;
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}
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extern struct group* prefix_getgrent()
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{
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if(!group_db_file) {
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return getgrent();
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}
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return fgetgrent(fp_grent);
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}
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extern void prefix_endgrent()
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{
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if(!group_db_file) {
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endgrent();
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return;
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}
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if (fp_grent)
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fclose(fp_grent);
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fp_grent = NULL;
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}
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extern struct group *prefix_getgr_nam_gid(const char *grname)
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{
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long long int gid;
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char *endptr;
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struct group *g;
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if (NULL == grname) {
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return NULL;
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}
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if (group_db_file) {
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errno = 0;
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gid = strtoll (grname, &endptr, 10);
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if ( ('\0' != *grname)
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&& ('\0' == *endptr)
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&& (ERANGE != errno)
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&& (gid == (gid_t)gid)) {
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return prefix_getgrgid ((gid_t) gid);
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}
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g = prefix_getgrnam (grname);
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return g ? __gr_dup(g) : NULL;
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}
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else
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return getgr_nam_gid(grname);
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}
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