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