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
22 struct 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
31 struct ssl_conf_cmd_st {
32 /* Command */
33 char *cmd;
34 /* Argument */
35 char *arg;
36 };
37
38 static struct ssl_conf_name_st *ssl_names;
39 static size_t ssl_names_count;
40
ssl_module_free(CONF_IMODULE * md)41 static 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
ssl_module_init(CONF_IMODULE * md,const CONF * cnf)61 static 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 */
conf_ssl_get(size_t idx,const char ** name,size_t * cnt)138 const 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 */
conf_ssl_name_find(const char * name,size_t * idx)150 int 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 */
conf_ssl_get_cmd(const SSL_CONF_CMD * cmd,size_t idx,char ** cmdstr,char ** arg)172 void 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
ossl_config_add_ssl_module(void)179 void ossl_config_add_ssl_module(void)
180 {
181 CONF_module_add("ssl_conf", ssl_module_init, ssl_module_free);
182 }
183