1/*
2 * Copyright 2015-2018 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 if (cmd_lists == NULL)
72 CONFerr(CONF_F_SSL_MODULE_INIT, CONF_R_SSL_SECTION_NOT_FOUND);
73 else
74 CONFerr(CONF_F_SSL_MODULE_INIT, CONF_R_SSL_SECTION_EMPTY);
75 ERR_add_error_data(2, "section=", ssl_conf_section);
76 goto err;
77 }
78 cnt = sk_CONF_VALUE_num(cmd_lists);
79 ssl_module_free(md);
80 ssl_names = OPENSSL_zalloc(sizeof(*ssl_names) * cnt);
81 if (ssl_names == NULL)
82 goto err;
83 ssl_names_count = cnt;
84 for (i = 0; i < ssl_names_count; i++) {
85 struct ssl_conf_name_st *ssl_name = ssl_names + i;
86 CONF_VALUE *sect = sk_CONF_VALUE_value(cmd_lists, (int)i);
87 STACK_OF(CONF_VALUE) *cmds = NCONF_get_section(cnf, sect->value);
88
89 if (sk_CONF_VALUE_num(cmds) <= 0) {
90 if (cmds == NULL)
91 CONFerr(CONF_F_SSL_MODULE_INIT,
92 CONF_R_SSL_COMMAND_SECTION_NOT_FOUND);
93 else
94 CONFerr(CONF_F_SSL_MODULE_INIT,
95 CONF_R_SSL_COMMAND_SECTION_EMPTY);
96 ERR_add_error_data(4, "name=", sect->name, ", value=", sect->value);
97 goto err;
98 }
99 ssl_name->name = OPENSSL_strdup(sect->name);
100 if (ssl_name->name == NULL)
101 goto err;
102 cnt = sk_CONF_VALUE_num(cmds);
103 ssl_name->cmds = OPENSSL_zalloc(cnt * sizeof(struct ssl_conf_cmd_st));
104 if (ssl_name->cmds == NULL)
105 goto err;
106 ssl_name->cmd_count = cnt;
107 for (j = 0; j < cnt; j++) {
108 const char *name;
109 CONF_VALUE *cmd_conf = sk_CONF_VALUE_value(cmds, (int)j);
110 struct ssl_conf_cmd_st *cmd = ssl_name->cmds + j;
111
112 /* Skip any initial dot in name */
113 name = strchr(cmd_conf->name, '.');
114 if (name != NULL)
115 name++;
116 else
117 name = cmd_conf->name;
118 cmd->cmd = OPENSSL_strdup(name);
119 cmd->arg = OPENSSL_strdup(cmd_conf->value);
120 if (cmd->cmd == NULL || cmd->arg == NULL)
121 goto err;
122 }
123
124 }
125 rv = 1;
126 err:
127 if (rv == 0)
128 ssl_module_free(md);
129 return rv;
130}
131
132/*
133 * Returns the set of commands with index |idx| previously searched for via
134 * conf_ssl_name_find. Also stores the name of the set of commands in |*name|
135 * and the number of commands in the set in |*cnt|.
136 */
137const SSL_CONF_CMD *conf_ssl_get(size_t idx, const char **name, size_t *cnt)
138{
139 *name = ssl_names[idx].name;
140 *cnt = ssl_names[idx].cmd_count;
141 return ssl_names[idx].cmds;
142}
143
144/*
145 * Search for the named set of commands given in |name|. On success return the
146 * index for the command set in |*idx|.
147 * Returns 1 on success or 0 on failure.
148 */
149int conf_ssl_name_find(const char *name, size_t *idx)
150{
151 size_t i;
152 const struct ssl_conf_name_st *nm;
153
154 if (name == NULL)
155 return 0;
156 for (i = 0, nm = ssl_names; i < ssl_names_count; i++, nm++) {
157 if (strcmp(nm->name, name) == 0) {
158 *idx = i;
159 return 1;
160 }
161 }
162 return 0;
163}
164
165/*
166 * Given a command set |cmd|, return details on the command at index |idx| which
167 * must be less than the number of commands in the set (as returned by
168 * conf_ssl_get). The name of the command will be returned in |*cmdstr| and the
169 * argument is returned in |*arg|.
170 */
171void conf_ssl_get_cmd(const SSL_CONF_CMD *cmd, size_t idx, char **cmdstr,
172 char **arg)
173{
174 *cmdstr = cmd[idx].cmd;
175 *arg = cmd[idx].arg;
176}
177
178void conf_add_ssl_module(void)
179{
180 CONF_module_add("ssl_conf", ssl_module_init, ssl_module_free);
181}
182