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