1 /* $NetBSD: openpam_set_option.c,v 1.3 2017/05/06 19:50:09 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 5 * Copyright (c) 2004-2011 Dag-Erling Smørgrav 6 * All rights reserved. 7 * 8 * This software was developed for the FreeBSD Project by ThinkSec AS and 9 * Network Associates Laboratories, the Security Research Division of 10 * Network Associates, Inc. under DARPA/SPAWAR contract N66001-01-C-8035 11 * ("CBOSS"), as part of the DARPA CHATS research program. 12 * 13 * Redistribution and use in source and binary forms, with or without 14 * modification, are permitted provided that the following conditions 15 * are met: 16 * 1. Redistributions of source code must retain the above copyright 17 * notice, this list of conditions and the following disclaimer. 18 * 2. Redistributions in binary form must reproduce the above copyright 19 * notice, this list of conditions and the following disclaimer in the 20 * documentation and/or other materials provided with the distribution. 21 * 3. The name of the author may not be used to endorse or promote 22 * products derived from this software without specific prior written 23 * permission. 24 * 25 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 26 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 27 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 28 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 29 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 30 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 31 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 32 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 33 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 34 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 35 * SUCH DAMAGE. 36 * 37 * $OpenPAM: openpam_set_option.c 938 2017-04-30 21:34:42Z des $ 38 */ 39 40 #ifdef HAVE_CONFIG_H 41 # include "config.h" 42 #endif 43 44 #include <sys/cdefs.h> 45 __RCSID("$NetBSD: openpam_set_option.c,v 1.3 2017/05/06 19:50:09 christos Exp $"); 46 47 #include <sys/param.h> 48 49 #include <stdio.h> 50 #include <stdlib.h> 51 #include <string.h> 52 53 #include <security/pam_appl.h> 54 55 #include "openpam_impl.h" 56 #include "openpam_asprintf.h" 57 58 /* 59 * OpenPAM extension 60 * 61 * Sets the value of a module option 62 */ 63 64 int 65 openpam_set_option(pam_handle_t *pamh, 66 const char *option, 67 const char *value) 68 { 69 pam_chain_t *cur; 70 char *opt, **optv; 71 size_t len; 72 int i; 73 74 ENTERS(option); 75 if (pamh == NULL || pamh->current == NULL || option == NULL) 76 RETURNC(PAM_SYSTEM_ERR); 77 cur = pamh->current; 78 for (len = 0; option[len] != '\0'; ++len) 79 if (option[len] == '=') 80 break; 81 for (i = 0; i < cur->optc; ++i) { 82 if (strncmp(cur->optv[i], option, len) == 0 && 83 (cur->optv[i][len] == '\0' || cur->optv[i][len] == '=')) 84 break; 85 } 86 if (value == NULL) { 87 /* remove */ 88 if (i == cur->optc) 89 RETURNC(PAM_SUCCESS); 90 for (free(cur->optv[i]); i < cur->optc; ++i) 91 cur->optv[i] = cur->optv[i + 1]; 92 cur->optv[i] = NULL; 93 RETURNC(PAM_SUCCESS); 94 } 95 if (asprintf(&opt, "%.*s=%s", (int)len, option, value) < 0) 96 RETURNC(PAM_BUF_ERR); 97 if (i == cur->optc) { 98 /* add */ 99 optv = realloc(cur->optv, 100 sizeof(*optv) * ((size_t)cur->optc + 2)); 101 if (optv == NULL) { 102 FREE(opt); 103 RETURNC(PAM_BUF_ERR); 104 } 105 optv[i] = opt; 106 optv[i + 1] = NULL; 107 cur->optv = optv; 108 ++cur->optc; 109 } else { 110 /* replace */ 111 FREE(cur->optv[i]); 112 cur->optv[i] = opt; 113 } 114 RETURNC(PAM_SUCCESS); 115 } 116 117 /* 118 * Error codes: 119 * 120 * PAM_SYSTEM_ERR 121 * PAM_BUF_ERR 122 */ 123 124 /** 125 * The =openpam_set_option function sets the specified option in the 126 * context of the currently executing service module. 127 * 128 * >openpam_get_option 129 */ 130