xref: /openssl/crypto/conf/conf_api.c (revision fecb3aae)
1 /*
2  * Copyright 1995-2022 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 
_CONF_get_section(const CONF * conf,const char * section)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 
STACK_OF(CONF_VALUE)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 
_CONF_add_string(CONF * conf,CONF_VALUE * section,CONF_VALUE * value)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 
_CONF_get_string(const CONF * conf,const char * section,const char * name)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 
conf_value_hash(const CONF_VALUE * v)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 
conf_value_cmp(const CONF_VALUE * a,const CONF_VALUE * b)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 
_CONF_new_data(CONF * conf)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 
_CONF_free_data(CONF * conf)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 
value_free_hash(const CONF_VALUE * a,LHASH_OF (CONF_VALUE)* conf)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 
value_free_stack_doall(CONF_VALUE * a)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 
_CONF_new_section(CONF * conf,const char * section)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 }
215