1 /* $NetBSD: openpam_set_option.c,v 1.4 2023/06/30 21:46:20 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2002-2003 Networks Associates Technology, Inc. 5 * Copyright (c) 2004-2023 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 38 #ifdef HAVE_CONFIG_H 39 # include "config.h" 40 #endif 41 42 #include <sys/cdefs.h> 43 __RCSID("$NetBSD: openpam_set_option.c,v 1.4 2023/06/30 21:46:20 christos Exp $"); 44 45 #include <sys/param.h> 46 47 #include <stdio.h> 48 #include <stdlib.h> 49 #include <string.h> 50 51 #include <security/pam_appl.h> 52 53 #include "openpam_impl.h" 54 #include "openpam_asprintf.h" 55 56 /* 57 * OpenPAM extension 58 * 59 * Sets the value of a module option 60 */ 61 62 int 63 openpam_set_option(pam_handle_t *pamh, 64 const char *option, 65 const char *value) 66 { 67 pam_chain_t *cur; 68 char *opt, **optv; 69 size_t len; 70 int i; 71 72 ENTERS(option); 73 if (pamh == NULL || pamh->current == NULL || option == NULL) 74 RETURNC(PAM_SYSTEM_ERR); 75 cur = pamh->current; 76 for (len = 0; option[len] != '\0'; ++len) 77 if (option[len] == '=') 78 break; 79 for (i = 0; i < cur->optc; ++i) { 80 if (strncmp(cur->optv[i], option, len) == 0 && 81 (cur->optv[i][len] == '\0' || cur->optv[i][len] == '=')) 82 break; 83 } 84 if (value == NULL) { 85 /* remove */ 86 if (i == cur->optc) 87 RETURNC(PAM_SUCCESS); 88 for (free(cur->optv[i]); i < cur->optc; ++i) 89 cur->optv[i] = cur->optv[i + 1]; 90 cur->optv[i] = NULL; 91 --cur->optc; 92 RETURNC(PAM_SUCCESS); 93 } 94 if (asprintf(&opt, "%.*s=%s", (int)len, option, value) < 0) 95 RETURNC(PAM_BUF_ERR); 96 if (i == cur->optc) { 97 /* add */ 98 optv = realloc(cur->optv, 99 sizeof(*optv) * ((size_t)cur->optc + 2)); 100 if (optv == NULL) { 101 FREE(opt); 102 RETURNC(PAM_BUF_ERR); 103 } 104 optv[i] = opt; 105 optv[i + 1] = NULL; 106 cur->optv = optv; 107 ++cur->optc; 108 } else { 109 /* replace */ 110 FREE(cur->optv[i]); 111 cur->optv[i] = opt; 112 } 113 RETURNC(PAM_SUCCESS); 114 } 115 116 /* 117 * Error codes: 118 * 119 * PAM_SYSTEM_ERR 120 * PAM_BUF_ERR 121 */ 122 123 /** 124 * The =openpam_set_option function sets the specified option in the 125 * context of the currently executing service module. 126 * 127 * >openpam_get_option 128 */ 129