crypto/conf/conf_api.c

   1 /*
   2  * Copyright 1995-2021 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 /* Part of the code in here was originally in conf.c, which is now removed */
  11
  12 #include "e_os.h"
  13 #include "internal/cryptlib.h"
  14 #include <stdlib.h>
  15 #include <string.h>
  16 #include <openssl/conf.h>
  17 #include <openssl/conf_api.h>
  18
  19 static void value_free_hash(const CONF_VALUE *a, LHASH_OF(CONF_VALUE) *conf);
  20 static void value_free_stack_doall(CONF_VALUE *a);
  21
  22 CONF_VALUE *_CONF_get_section(const CONF *conf, const char *section)
  23 {
  24     CONF_VALUE vv;
  25
  26     if (conf == NULL || section == NULL)
  27         return NULL;
  28     vv.name = NULL;
  29     vv.section = (char *)section;
  30     return conf->data != NULL ? lh_CONF_VALUE_retrieve(conf->data, &vv) : NULL;
  31 }
  32
  33 STACK_OF(CONF_VALUE) *_CONF_get_section_values(const CONF *conf,
  34                                                const char *section)
  35 {
  36     CONF_VALUE *v;
  37
  38     v = _CONF_get_section(conf, section);
  39     if (v == NULL)
  40         return NULL;
  41     return ((STACK_OF(CONF_VALUE) *)v->value);
  42 }
  43
  44 int _CONF_add_string(CONF *conf, CONF_VALUE *section, CONF_VALUE *value)
  45 {
  46     CONF_VALUE *v = NULL;
  47     STACK_OF(CONF_VALUE) *ts;
  48
  49     ts = (STACK_OF(CONF_VALUE) *)section->value;
  50
  51     value->section = section->section;
  52     if (!sk_CONF_VALUE_push(ts, value))
  53         return 0;
  54
  55     v = lh_CONF_VALUE_insert(conf->data, value);
  56     if (v != NULL) {
  57         (void)sk_CONF_VALUE_delete_ptr(ts, v);
  58         OPENSSL_free(v->name);
  59         OPENSSL_free(v->value);
  60         OPENSSL_free(v);
  61     }
  62     return 1;
  63 }
  64
  65 char *_CONF_get_string(const CONF *conf, const char *section,
  66                        const char *name)
  67 {
  68     CONF_VALUE *v, vv;
  69     char *p;
  70
  71     if (name == NULL)
  72         return NULL;
  73     if (conf == NULL)
  74         return ossl_safe_getenv(name);
  75     if (conf->data == NULL)
  76         return NULL;
  77     if (section != NULL) {
  78         vv.name = (char *)name;
  79         vv.section = (char *)section;
  80         v = lh_CONF_VALUE_retrieve(conf->data, &vv);
  81         if (v != NULL)
  82             return v->value;
  83         if (strcmp(section, "ENV") == 0) {
  84             p = ossl_safe_getenv(name);
  85             if (p != NULL)
  86                 return p;
  87         }
  88     }
  89     vv.section = "default";
  90     vv.name = (char *)name;
  91     v = lh_CONF_VALUE_retrieve(conf->data, &vv);
  92     if (v == NULL)
  93         return NULL;
  94     return v->value;
  95 }
  96
  97 static unsigned long conf_value_hash(const CONF_VALUE *v)
  98 {
  99     return (OPENSSL_LH_strhash(v->section) << 2) ^ OPENSSL_LH_strhash(v->name);
 100 }
 101
 102 static int conf_value_cmp(const CONF_VALUE *a, const CONF_VALUE *b)
 103 {
 104     int i;
 105
 106     if (a->section != b->section) {
 107         i = strcmp(a->section, b->section);
 108         if (i != 0)
 109             return i;
 110     }
 111
 112     if (a->name != NULL && b->name != NULL)
 113         return strcmp(a->name, b->name);
 114     if (a->name == b->name)
 115         return 0;
 116     return (a->name == NULL) ? -1 : 1;
 117 }
 118
 119 int _CONF_new_data(CONF *conf)
 120 {
 121     if (conf == NULL)
 122         return 0;
 123     if (conf->data == NULL) {
 124         conf->data = lh_CONF_VALUE_new(conf_value_hash, conf_value_cmp);
 125         if (conf->data == NULL)
 126             return 0;
 127     }
 128     return 1;
 129 }
 130
 131 typedef LHASH_OF(CONF_VALUE) LH_CONF_VALUE;
 132
 133 IMPLEMENT_LHASH_DOALL_ARG_CONST(CONF_VALUE, LH_CONF_VALUE);
 134
 135 void _CONF_free_data(CONF *conf)
 136 {
 137     if (conf == NULL || conf->data == NULL)
 138         return;
 139
 140     /* evil thing to make sure the 'OPENSSL_free()' works as expected */
 141     lh_CONF_VALUE_set_down_load(conf->data, 0);
 142     lh_CONF_VALUE_doall_LH_CONF_VALUE(conf->data, value_free_hash, conf->data);
 143
 144     /*
 145      * We now have only 'section' entries in the hash table. Due to problems
 146      * with
 147      */
 148
 149     lh_CONF_VALUE_doall(conf->data, value_free_stack_doall);
 150     lh_CONF_VALUE_free(conf->data);
 151 }
 152
 153 static void value_free_hash(const CONF_VALUE *a, LHASH_OF(CONF_VALUE) *conf)
 154 {
 155     if (a->name != NULL)
 156         (void)lh_CONF_VALUE_delete(conf, a);
 157 }
 158
 159 static void value_free_stack_doall(CONF_VALUE *a)
 160 {
 161     CONF_VALUE *vv;
 162     STACK_OF(CONF_VALUE) *sk;
 163     int i;
 164
 165     if (a->name != NULL)
 166         return;
 167
 168     sk = (STACK_OF(CONF_VALUE) *)a->value;
 169     for (i = sk_CONF_VALUE_num(sk) - 1; i >= 0; i--) {
 170         vv = sk_CONF_VALUE_value(sk, i);
 171         OPENSSL_free(vv->value);
 172         OPENSSL_free(vv->name);
 173         OPENSSL_free(vv);
 174     }
 175     sk_CONF_VALUE_free(sk);
 176     OPENSSL_free(a->section);
 177     OPENSSL_free(a);
 178 }
 179
 180 CONF_VALUE *_CONF_new_section(CONF *conf, const char *section)
 181 {
 182     STACK_OF(CONF_VALUE) *sk = NULL;
 183     int i;
 184     CONF_VALUE *v = NULL, *vv;
 185
 186     if ((sk = sk_CONF_VALUE_new_null()) == NULL)
 187         goto err;
 188     if ((v = OPENSSL_malloc(sizeof(*v))) == NULL)
 189         goto err;
 190     i = strlen(section) + 1;
 191     if ((v->section = OPENSSL_malloc(i)) == NULL)
 192         goto err;
 193
 194     memcpy(v->section, section, i);
 195     v->name = NULL;
 196     v->value = (char *)sk;
 197
 198     vv = lh_CONF_VALUE_insert(conf->data, v);
 199     if (vv != NULL || lh_CONF_VALUE_error(conf->data) > 0)
 200         goto err;
 201     return v;
 202
 203  err:
 204     sk_CONF_VALUE_free(sk);
 205     if (v != NULL)
 206         OPENSSL_free(v->section);
 207     OPENSSL_free(v);
 208     return NULL;
 209 }