1/* 2 * Copyright 2015-2021 The OpenSSL Project Authors. All Rights Reserved. 3 * 4 * Licensed under the Apache License 2.0 (the "License"). You may not use 5 * this file except in compliance with the License. You can obtain a copy 6 * in the file LICENSE in the source distribution or at 7 * https://www.openssl.org/source/license.html 8 */ 9 10#include <stdio.h> 11#include <string.h> 12#include <openssl/conf.h> 13#include <openssl/err.h> 14#include "internal/sslconf.h" 15#include "conf_local.h" 16 17/* 18 * SSL library configuration module placeholder. We load it here but defer 19 * all decisions about its contents to libssl. 20 */ 21 22struct ssl_conf_name_st { 23 /* Name of this set of commands */ 24 char *name; 25 /* List of commands */ 26 SSL_CONF_CMD *cmds; 27 /* Number of commands */ 28 size_t cmd_count; 29}; 30 31struct ssl_conf_cmd_st { 32 /* Command */ 33 char *cmd; 34 /* Argument */ 35 char *arg; 36}; 37 38static struct ssl_conf_name_st *ssl_names; 39static size_t ssl_names_count; 40 41static void ssl_module_free(CONF_IMODULE *md) 42{ 43 size_t i, j; 44 if (ssl_names == NULL) 45 return; 46 for (i = 0; i < ssl_names_count; i++) { 47 struct ssl_conf_name_st *tname = ssl_names + i; 48 49 OPENSSL_free(tname->name); 50 for (j = 0; j < tname->cmd_count; j++) { 51 OPENSSL_free(tname->cmds[j].cmd); 52 OPENSSL_free(tname->cmds[j].arg); 53 } 54 OPENSSL_free(tname->cmds); 55 } 56 OPENSSL_free(ssl_names); 57 ssl_names = NULL; 58 ssl_names_count = 0; 59} 60 61static int ssl_module_init(CONF_IMODULE *md, const CONF *cnf) 62{ 63 size_t i, j, cnt; 64 int rv = 0; 65 const char *ssl_conf_section; 66 STACK_OF(CONF_VALUE) *cmd_lists; 67 68 ssl_conf_section = CONF_imodule_get_value(md); 69 cmd_lists = NCONF_get_section(cnf, ssl_conf_section); 70 if (sk_CONF_VALUE_num(cmd_lists) <= 0) { 71 int rcode = 72 cmd_lists == NULL 73 ? CONF_R_SSL_SECTION_NOT_FOUND 74 : CONF_R_SSL_SECTION_EMPTY; 75 76 ERR_raise_data(ERR_LIB_CONF, rcode, "section=%s", ssl_conf_section); 77 goto err; 78 } 79 cnt = sk_CONF_VALUE_num(cmd_lists); 80 ssl_module_free(md); 81 ssl_names = OPENSSL_zalloc(sizeof(*ssl_names) * cnt); 82 if (ssl_names == NULL) 83 goto err; 84 ssl_names_count = cnt; 85 for (i = 0; i < ssl_names_count; i++) { 86 struct ssl_conf_name_st *ssl_name = ssl_names + i; 87 CONF_VALUE *sect = sk_CONF_VALUE_value(cmd_lists, (int)i); 88 STACK_OF(CONF_VALUE) *cmds = NCONF_get_section(cnf, sect->value); 89 90 if (sk_CONF_VALUE_num(cmds) <= 0) { 91 int rcode = 92 cmds == NULL 93 ? CONF_R_SSL_COMMAND_SECTION_NOT_FOUND 94 : CONF_R_SSL_COMMAND_SECTION_EMPTY; 95 96 ERR_raise_data(ERR_LIB_CONF, rcode, 97 "name=%s, value=%s", sect->name, sect->value); 98 goto err; 99 } 100 ssl_name->name = OPENSSL_strdup(sect->name); 101 if (ssl_name->name == NULL) 102 goto err; 103 cnt = sk_CONF_VALUE_num(cmds); 104 ssl_name->cmds = OPENSSL_zalloc(cnt * sizeof(struct ssl_conf_cmd_st)); 105 if (ssl_name->cmds == NULL) 106 goto err; 107 ssl_name->cmd_count = cnt; 108 for (j = 0; j < cnt; j++) { 109 const char *name; 110 CONF_VALUE *cmd_conf = sk_CONF_VALUE_value(cmds, (int)j); 111 struct ssl_conf_cmd_st *cmd = ssl_name->cmds + j; 112 113 /* Skip any initial dot in name */ 114 name = strchr(cmd_conf->name, '.'); 115 if (name != NULL) 116 name++; 117 else 118 name = cmd_conf->name; 119 cmd->cmd = OPENSSL_strdup(name); 120 cmd->arg = OPENSSL_strdup(cmd_conf->value); 121 if (cmd->cmd == NULL || cmd->arg == NULL) 122 goto err; 123 } 124 125 } 126 rv = 1; 127 err: 128 if (rv == 0) 129 ssl_module_free(md); 130 return rv; 131} 132 133/* 134 * Returns the set of commands with index |idx| previously searched for via 135 * conf_ssl_name_find. Also stores the name of the set of commands in |*name| 136 * and the number of commands in the set in |*cnt|. 137 */ 138const SSL_CONF_CMD *conf_ssl_get(size_t idx, const char **name, size_t *cnt) 139{ 140 *name = ssl_names[idx].name; 141 *cnt = ssl_names[idx].cmd_count; 142 return ssl_names[idx].cmds; 143} 144 145/* 146 * Search for the named set of commands given in |name|. On success return the 147 * index for the command set in |*idx|. 148 * Returns 1 on success or 0 on failure. 149 */ 150int conf_ssl_name_find(const char *name, size_t *idx) 151{ 152 size_t i; 153 const struct ssl_conf_name_st *nm; 154 155 if (name == NULL) 156 return 0; 157 for (i = 0, nm = ssl_names; i < ssl_names_count; i++, nm++) { 158 if (strcmp(nm->name, name) == 0) { 159 *idx = i; 160 return 1; 161 } 162 } 163 return 0; 164} 165 166/* 167 * Given a command set |cmd|, return details on the command at index |idx| which 168 * must be less than the number of commands in the set (as returned by 169 * conf_ssl_get). The name of the command will be returned in |*cmdstr| and the 170 * argument is returned in |*arg|. 171 */ 172void conf_ssl_get_cmd(const SSL_CONF_CMD *cmd, size_t idx, char **cmdstr, 173 char **arg) 174{ 175 *cmdstr = cmd[idx].cmd; 176 *arg = cmd[idx].arg; 177} 178 179void ossl_config_add_ssl_module(void) 180{ 181 CONF_module_add("ssl_conf", ssl_module_init, ssl_module_free); 182} 183