crypto/conf/conf_ssl.c

   1 /*
   2  * Copyright 2015-2018 The OpenSSL Project Authors. All Rights Reserved.
   3  *
   4  * Licensed under the OpenSSL license (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_lcl.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
  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
  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         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_names = OPENSSL_zalloc(sizeof(*ssl_names) * cnt);
  80     ssl_names_count = cnt;
  81     for (i = 0; i < ssl_names_count; i++) {
  82         struct ssl_conf_name_st *ssl_name = ssl_names + i;
  83         CONF_VALUE *sect = sk_CONF_VALUE_value(cmd_lists, (int)i);
  84         STACK_OF(CONF_VALUE) *cmds = NCONF_get_section(cnf, sect->value);
  85
  86         if (sk_CONF_VALUE_num(cmds) <= 0) {
  87             if (cmds == NULL)
  88                 CONFerr(CONF_F_SSL_MODULE_INIT,
  89                         CONF_R_SSL_COMMAND_SECTION_NOT_FOUND);
  90             else
  91                 CONFerr(CONF_F_SSL_MODULE_INIT,
  92                         CONF_R_SSL_COMMAND_SECTION_EMPTY);
  93             ERR_add_error_data(4, "name=", sect->name, ", value=", sect->value);
  94             goto err;
  95         }
  96         ssl_name->name = OPENSSL_strdup(sect->name);
  97         if (ssl_name->name == NULL)
  98             goto err;
  99         cnt = sk_CONF_VALUE_num(cmds);
 100         ssl_name->cmds = OPENSSL_zalloc(cnt * sizeof(struct ssl_conf_cmd_st));
 101         if (ssl_name->cmds == NULL)
 102             goto err;
 103         ssl_name->cmd_count = cnt;
 104         for (j = 0; j < cnt; j++) {
 105             const char *name;
 106             CONF_VALUE *cmd_conf = sk_CONF_VALUE_value(cmds, (int)j);
 107             struct ssl_conf_cmd_st *cmd = ssl_name->cmds + j;
 108
 109             /* Skip any initial dot in name */
 110             name = strchr(cmd_conf->name, '.');
 111             if (name != NULL)
 112                 name++;
 113             else
 114                 name = cmd_conf->name;
 115             cmd->cmd = OPENSSL_strdup(name);
 116             cmd->arg = OPENSSL_strdup(cmd_conf->value);
 117             if (cmd->cmd == NULL || cmd->arg == NULL)
 118                 goto err;
 119         }
 120
 121     }
 122     rv = 1;
 123  err:
 124     if (rv == 0)
 125         ssl_module_free(md);
 126     return rv;
 127 }
 128
 129 /*
 130  * Returns the set of commands with index |idx| previously searched for via
 131  * conf_ssl_name_find. Also stores the name of the set of commands in |*name|
 132  * and the number of commands in the set in |*cnt|.
 133  */
 134 const SSL_CONF_CMD *conf_ssl_get(size_t idx, const char **name, size_t *cnt)
 135 {
 136     *name = ssl_names[idx].name;
 137     *cnt = ssl_names[idx].cmd_count;
 138     return ssl_names[idx].cmds;
 139 }
 140
 141 /*
 142  * Search for the named set of commands given in |name|. On success return the
 143  * index for the command set in |*idx|.
 144  * Returns 1 on success or 0 on failure.
 145  */
 146 int conf_ssl_name_find(const char *name, size_t *idx)
 147 {
 148     size_t i;
 149     const struct ssl_conf_name_st *nm;
 150
 151     if (name == NULL)
 152         return 0;
 153     for (i = 0, nm = ssl_names; i < ssl_names_count; i++, nm++) {
 154         if (strcmp(nm->name, name) == 0) {
 155             *idx = i;
 156             return 1;
 157         }
 158     }
 159     return 0;
 160 }
 161
 162 /*
 163  * Given a command set |cmd|, return details on the command at index |idx| which
 164  * must be less than the number of commands in the set (as returned by
 165  * conf_ssl_get). The name of the command will be returned in |*cmdstr| and the
 166  * argument is returned in |*arg|.
 167  */
 168 void conf_ssl_get_cmd(const SSL_CONF_CMD *cmd, size_t idx, char **cmdstr,
 169                       char **arg)
 170 {
 171     *cmdstr = cmd[idx].cmd;
 172     *arg = cmd[idx].arg;
 173 }
 174
 175 void conf_add_ssl_module(void)
 176 {
 177     CONF_module_add("ssl_conf", ssl_module_init, ssl_module_free);
 178 }