crypto/conf/conf_api.c

   1 /*
   2  * Copyright 1995-2016 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 /* Part of the code in here was originally in conf.c, which is now removed */
  11
  12 #include "e_os.h"
  13 #include <stdlib.h>
  14 #include <string.h>
  15 #include <openssl/conf.h>
  16 #include <openssl/conf_api.h>
  17
  18 static void value_free_hash(const CONF_VALUE *a, LHASH_OF(CONF_VALUE) *conf);
  19 static void value_free_stack_doall(CONF_VALUE *a);
  20
  21 /* Up until OpenSSL 0.9.5a, this was get_section */
  22 CONF_VALUE *_CONF_get_section(const CONF *conf, const char *section)
  23 {
  24     CONF_VALUE *v, vv;
  25
  26     if ((conf == NULL) || (section == NULL))
  27         return NULL;
  28     vv.name = NULL;
  29     vv.section = (char *)section;
  30     v = lh_CONF_VALUE_retrieve(conf->data, &vv);
  31     return v;
  32 }
  33
  34 /* Up until OpenSSL 0.9.5a, this was CONF_get_section */
  35 STACK_OF(CONF_VALUE) *_CONF_get_section_values(const CONF *conf,
  36                                                const char *section)
  37 {
  38     CONF_VALUE *v;
  39
  40     v = _CONF_get_section(conf, section);
  41     if (v != NULL)
  42         return ((STACK_OF(CONF_VALUE) *)v->value);
  43     else
  44         return NULL;
  45 }
  46
  47 int _CONF_add_string(CONF *conf, CONF_VALUE *section, CONF_VALUE *value)
  48 {
  49     CONF_VALUE *v = NULL;
  50     STACK_OF(CONF_VALUE) *ts;
  51
  52     ts = (STACK_OF(CONF_VALUE) *)section->value;
  53
  54     value->section = section->section;
  55     if (!sk_CONF_VALUE_push(ts, value)) {
  56         return 0;
  57     }
  58
  59     v = lh_CONF_VALUE_insert(conf->data, value);
  60     if (v != NULL) {
  61         (void)sk_CONF_VALUE_delete_ptr(ts, v);
  62         OPENSSL_free(v->name);
  63         OPENSSL_free(v->value);
  64         OPENSSL_free(v);
  65     }
  66     return 1;
  67 }
  68
  69 char *_CONF_get_string(const CONF *conf, const char *section,
  70                        const char *name)
  71 {
  72     CONF_VALUE *v, vv;
  73     char *p;
  74
  75     if (name == NULL)
  76         return NULL;
  77     if (conf != NULL) {
  78         if (section != NULL) {
  79             vv.name = (char *)name;
  80             vv.section = (char *)section;
  81             v = lh_CONF_VALUE_retrieve(conf->data, &vv);
  82             if (v != NULL)
  83                 return v->value;
  84             if (strcmp(section, "ENV") == 0) {
  85                 p = getenv(name);
  86                 if (p != NULL)
  87                     return p;
  88             }
  89         }
  90         vv.section = "default";
  91         vv.name = (char *)name;
  92         v = lh_CONF_VALUE_retrieve(conf->data, &vv);
  93         if (v != NULL)
  94             return v->value;
  95         else
  96             return NULL;
  97     } else
  98         return getenv(name);
  99 }
 100
 101 static unsigned long conf_value_hash(const CONF_VALUE *v)
 102 {
 103     return (OPENSSL_LH_strhash(v->section) << 2) ^ OPENSSL_LH_strhash(v->name);
 104 }
 105
 106 static int conf_value_cmp(const CONF_VALUE *a, const CONF_VALUE *b)
 107 {
 108     int i;
 109
 110     if (a->section != b->section) {
 111         i = strcmp(a->section, b->section);
 112         if (i)
 113             return i;
 114     }
 115
 116     if ((a->name != NULL) && (b->name != NULL)) {
 117         i = strcmp(a->name, b->name);
 118         return i;
 119     } else if (a->name == b->name)
 120         return 0;
 121     else
 122         return ((a->name == NULL) ? -1 : 1);
 123 }
 124
 125 int _CONF_new_data(CONF *conf)
 126 {
 127     if (conf == NULL) {
 128         return 0;
 129     }
 130     if (conf->data == NULL) {
 131         conf->data = lh_CONF_VALUE_new(conf_value_hash, conf_value_cmp);
 132         if (conf->data == NULL)
 133             return 0;
 134     }
 135     return 1;
 136 }
 137
 138 typedef LHASH_OF(CONF_VALUE) LH_CONF_VALUE;
 139
 140 IMPLEMENT_LHASH_DOALL_ARG_CONST(CONF_VALUE, LH_CONF_VALUE);
 141
 142 void _CONF_free_data(CONF *conf)
 143 {
 144     if (conf == NULL || conf->data == NULL)
 145         return;
 146
 147     /* evil thing to make sure the 'OPENSSL_free()' works as expected */
 148     lh_CONF_VALUE_set_down_load(conf->data, 0);
 149     lh_CONF_VALUE_doall_LH_CONF_VALUE(conf->data, value_free_hash, conf->data);
 150
 151     /*
 152      * We now have only 'section' entries in the hash table. Due to problems
 153      * with
 154      */
 155
 156     lh_CONF_VALUE_doall(conf->data, value_free_stack_doall);
 157     lh_CONF_VALUE_free(conf->data);
 158 }
 159
 160 static void value_free_hash(const CONF_VALUE *a, LHASH_OF(CONF_VALUE) *conf)
 161 {
 162     if (a->name != NULL)
 163         (void)lh_CONF_VALUE_delete(conf, a);
 164 }
 165
 166 static void value_free_stack_doall(CONF_VALUE *a)
 167 {
 168     CONF_VALUE *vv;
 169     STACK_OF(CONF_VALUE) *sk;
 170     int i;
 171
 172     if (a->name != NULL)
 173         return;
 174
 175     sk = (STACK_OF(CONF_VALUE) *)a->value;
 176     for (i = sk_CONF_VALUE_num(sk) - 1; i >= 0; i--) {
 177         vv = sk_CONF_VALUE_value(sk, i);
 178         OPENSSL_free(vv->value);
 179         OPENSSL_free(vv->name);
 180         OPENSSL_free(vv);
 181     }
 182     sk_CONF_VALUE_free(sk);
 183     OPENSSL_free(a->section);
 184     OPENSSL_free(a);
 185 }
 186
 187 /* Up until OpenSSL 0.9.5a, this was new_section */
 188 CONF_VALUE *_CONF_new_section(CONF *conf, const char *section)
 189 {
 190     STACK_OF(CONF_VALUE) *sk = NULL;
 191     int i;
 192     CONF_VALUE *v = NULL, *vv;
 193
 194     if ((sk = sk_CONF_VALUE_new_null()) == NULL)
 195         goto err;
 196     if ((v = OPENSSL_malloc(sizeof(*v))) == NULL)
 197         goto err;
 198     i = strlen(section) + 1;
 199     if ((v->section = OPENSSL_malloc(i)) == NULL)
 200         goto err;
 201
 202     memcpy(v->section, section, i);
 203     v->name = NULL;
 204     v->value = (char *)sk;
 205
 206     vv = lh_CONF_VALUE_insert(conf->data, v);
 207     if (vv != NULL)
 208         goto err;
 209     return v;
 210
 211  err:
 212     sk_CONF_VALUE_free(sk);
 213     OPENSSL_free(v);
 214     return NULL;
 215 }