[331] | 1 | /*
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| 2 | * Copyright 1999-2016 The OpenSSL Project Authors. All Rights Reserved.
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| 3 | *
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| 4 | * Licensed under the OpenSSL license (the "License"). You may not use
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| 5 | * this file except in compliance with the License. You can obtain a copy
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| 6 | * in the file LICENSE in the source distribution or at
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| 7 | * https://www.openssl.org/source/license.html
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| 8 | */
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| 9 |
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| 10 | /* extension creation utilities */
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| 11 |
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| 12 | #include <stdio.h>
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| 13 | #include <ctype.h>
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| 14 | #include "internal/cryptlib.h"
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| 15 | #include <openssl/conf.h>
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| 16 | #include <openssl/x509.h>
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| 17 | #include "internal/x509_int.h"
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| 18 | #include <openssl/x509v3.h>
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| 19 |
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| 20 | static int v3_check_critical(const char **value);
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| 21 | static int v3_check_generic(const char **value);
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| 22 | static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
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| 23 | int crit, const char *value);
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| 24 | static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value,
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| 25 | int crit, int type,
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| 26 | X509V3_CTX *ctx);
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| 27 | static char *conf_lhash_get_string(void *db, const char *section, const char *value);
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| 28 | static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, const char *section);
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| 29 | static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
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| 30 | int ext_nid, int crit, void *ext_struc);
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| 31 | static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx,
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| 32 | long *ext_len);
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| 33 | /* CONF *conf: Config file */
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| 34 | /* char *name: Name */
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| 35 | /* char *value: Value */
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| 36 | X509_EXTENSION *X509V3_EXT_nconf(CONF *conf, X509V3_CTX *ctx, const char *name,
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| 37 | const char *value)
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| 38 | {
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| 39 | int crit;
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| 40 | int ext_type;
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| 41 | X509_EXTENSION *ret;
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| 42 | crit = v3_check_critical(&value);
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| 43 | if ((ext_type = v3_check_generic(&value)))
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| 44 | return v3_generic_extension(name, value, crit, ext_type, ctx);
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| 45 | ret = do_ext_nconf(conf, ctx, OBJ_sn2nid(name), crit, value);
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| 46 | if (!ret) {
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| 47 | X509V3err(X509V3_F_X509V3_EXT_NCONF, X509V3_R_ERROR_IN_EXTENSION);
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| 48 | ERR_add_error_data(4, "name=", name, ", value=", value);
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| 49 | }
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| 50 | return ret;
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| 51 | }
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| 52 |
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| 53 | /* CONF *conf: Config file */
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| 54 | /* char *value: Value */
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| 55 | X509_EXTENSION *X509V3_EXT_nconf_nid(CONF *conf, X509V3_CTX *ctx, int ext_nid,
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| 56 | const char *value)
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| 57 | {
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| 58 | int crit;
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| 59 | int ext_type;
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| 60 | crit = v3_check_critical(&value);
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| 61 | if ((ext_type = v3_check_generic(&value)))
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| 62 | return v3_generic_extension(OBJ_nid2sn(ext_nid),
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| 63 | value, crit, ext_type, ctx);
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| 64 | return do_ext_nconf(conf, ctx, ext_nid, crit, value);
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| 65 | }
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| 66 |
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| 67 | /* CONF *conf: Config file */
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| 68 | /* char *value: Value */
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| 69 | static X509_EXTENSION *do_ext_nconf(CONF *conf, X509V3_CTX *ctx, int ext_nid,
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| 70 | int crit, const char *value)
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| 71 | {
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| 72 | const X509V3_EXT_METHOD *method;
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| 73 | X509_EXTENSION *ext;
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| 74 | STACK_OF(CONF_VALUE) *nval;
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| 75 | void *ext_struc;
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| 76 |
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| 77 | if (ext_nid == NID_undef) {
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| 78 | X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION_NAME);
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| 79 | return NULL;
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| 80 | }
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| 81 | if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) {
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| 82 | X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_UNKNOWN_EXTENSION);
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| 83 | return NULL;
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| 84 | }
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| 85 | /* Now get internal extension representation based on type */
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| 86 | if (method->v2i) {
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| 87 | if (*value == '@')
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| 88 | nval = NCONF_get_section(conf, value + 1);
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| 89 | else
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| 90 | nval = X509V3_parse_list(value);
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| 91 | if (nval == NULL || sk_CONF_VALUE_num(nval) <= 0) {
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| 92 | X509V3err(X509V3_F_DO_EXT_NCONF,
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| 93 | X509V3_R_INVALID_EXTENSION_STRING);
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| 94 | ERR_add_error_data(4, "name=", OBJ_nid2sn(ext_nid), ",section=",
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| 95 | value);
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| 96 | if (*value != '@')
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| 97 | sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
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| 98 | return NULL;
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| 99 | }
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| 100 | ext_struc = method->v2i(method, ctx, nval);
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| 101 | if (*value != '@')
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| 102 | sk_CONF_VALUE_pop_free(nval, X509V3_conf_free);
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| 103 | if (!ext_struc)
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| 104 | return NULL;
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| 105 | } else if (method->s2i) {
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| 106 | if ((ext_struc = method->s2i(method, ctx, value)) == NULL)
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| 107 | return NULL;
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| 108 | } else if (method->r2i) {
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| 109 | if (!ctx->db || !ctx->db_meth) {
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| 110 | X509V3err(X509V3_F_DO_EXT_NCONF, X509V3_R_NO_CONFIG_DATABASE);
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| 111 | return NULL;
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| 112 | }
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| 113 | if ((ext_struc = method->r2i(method, ctx, value)) == NULL)
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| 114 | return NULL;
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| 115 | } else {
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| 116 | X509V3err(X509V3_F_DO_EXT_NCONF,
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| 117 | X509V3_R_EXTENSION_SETTING_NOT_SUPPORTED);
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| 118 | ERR_add_error_data(2, "name=", OBJ_nid2sn(ext_nid));
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| 119 | return NULL;
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| 120 | }
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| 121 |
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| 122 | ext = do_ext_i2d(method, ext_nid, crit, ext_struc);
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| 123 | if (method->it)
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| 124 | ASN1_item_free(ext_struc, ASN1_ITEM_ptr(method->it));
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| 125 | else
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| 126 | method->ext_free(ext_struc);
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| 127 | return ext;
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| 128 |
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| 129 | }
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| 130 |
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| 131 | static X509_EXTENSION *do_ext_i2d(const X509V3_EXT_METHOD *method,
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| 132 | int ext_nid, int crit, void *ext_struc)
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| 133 | {
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| 134 | unsigned char *ext_der = NULL;
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| 135 | int ext_len;
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| 136 | ASN1_OCTET_STRING *ext_oct = NULL;
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| 137 | X509_EXTENSION *ext;
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| 138 | /* Convert internal representation to DER */
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| 139 | if (method->it) {
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| 140 | ext_der = NULL;
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| 141 | ext_len =
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| 142 | ASN1_item_i2d(ext_struc, &ext_der, ASN1_ITEM_ptr(method->it));
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| 143 | if (ext_len < 0)
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| 144 | goto merr;
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| 145 | } else {
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| 146 | unsigned char *p;
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| 147 |
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| 148 | ext_len = method->i2d(ext_struc, NULL);
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| 149 | if ((ext_der = OPENSSL_malloc(ext_len)) == NULL)
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| 150 | goto merr;
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| 151 | p = ext_der;
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| 152 | method->i2d(ext_struc, &p);
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| 153 | }
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| 154 | if ((ext_oct = ASN1_OCTET_STRING_new()) == NULL)
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| 155 | goto merr;
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| 156 | ext_oct->data = ext_der;
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| 157 | ext_der = NULL;
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| 158 | ext_oct->length = ext_len;
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| 159 |
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| 160 | ext = X509_EXTENSION_create_by_NID(NULL, ext_nid, crit, ext_oct);
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| 161 | if (!ext)
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| 162 | goto merr;
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| 163 | ASN1_OCTET_STRING_free(ext_oct);
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| 164 |
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| 165 | return ext;
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| 166 |
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| 167 | merr:
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| 168 | X509V3err(X509V3_F_DO_EXT_I2D, ERR_R_MALLOC_FAILURE);
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| 169 | OPENSSL_free(ext_der);
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| 170 | ASN1_OCTET_STRING_free(ext_oct);
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| 171 | return NULL;
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| 172 |
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| 173 | }
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| 174 |
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| 175 | /* Given an internal structure, nid and critical flag create an extension */
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| 176 |
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| 177 | X509_EXTENSION *X509V3_EXT_i2d(int ext_nid, int crit, void *ext_struc)
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| 178 | {
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| 179 | const X509V3_EXT_METHOD *method;
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| 180 |
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| 181 | if ((method = X509V3_EXT_get_nid(ext_nid)) == NULL) {
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| 182 | X509V3err(X509V3_F_X509V3_EXT_I2D, X509V3_R_UNKNOWN_EXTENSION);
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| 183 | return NULL;
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| 184 | }
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| 185 | return do_ext_i2d(method, ext_nid, crit, ext_struc);
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| 186 | }
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| 187 |
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| 188 | /* Check the extension string for critical flag */
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| 189 | static int v3_check_critical(const char **value)
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| 190 | {
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| 191 | const char *p = *value;
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| 192 | if ((strlen(p) < 9) || strncmp(p, "critical,", 9))
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| 193 | return 0;
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| 194 | p += 9;
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| 195 | while (isspace((unsigned char)*p))
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| 196 | p++;
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| 197 | *value = p;
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| 198 | return 1;
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| 199 | }
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| 200 |
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| 201 | /* Check extension string for generic extension and return the type */
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| 202 | static int v3_check_generic(const char **value)
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| 203 | {
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| 204 | int gen_type = 0;
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| 205 | const char *p = *value;
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| 206 | if ((strlen(p) >= 4) && strncmp(p, "DER:", 4) == 0) {
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| 207 | p += 4;
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| 208 | gen_type = 1;
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| 209 | } else if ((strlen(p) >= 5) && strncmp(p, "ASN1:", 5) == 0) {
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| 210 | p += 5;
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| 211 | gen_type = 2;
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| 212 | } else
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| 213 | return 0;
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| 214 |
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| 215 | while (isspace((unsigned char)*p))
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| 216 | p++;
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| 217 | *value = p;
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| 218 | return gen_type;
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| 219 | }
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| 220 |
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| 221 | /* Create a generic extension: for now just handle DER type */
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| 222 | static X509_EXTENSION *v3_generic_extension(const char *ext, const char *value,
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| 223 | int crit, int gen_type,
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| 224 | X509V3_CTX *ctx)
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| 225 | {
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| 226 | unsigned char *ext_der = NULL;
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| 227 | long ext_len = 0;
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| 228 | ASN1_OBJECT *obj = NULL;
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| 229 | ASN1_OCTET_STRING *oct = NULL;
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| 230 | X509_EXTENSION *extension = NULL;
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| 231 |
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| 232 | if ((obj = OBJ_txt2obj(ext, 0)) == NULL) {
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| 233 | X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
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| 234 | X509V3_R_EXTENSION_NAME_ERROR);
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| 235 | ERR_add_error_data(2, "name=", ext);
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| 236 | goto err;
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| 237 | }
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| 238 |
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| 239 | if (gen_type == 1)
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| 240 | ext_der = OPENSSL_hexstr2buf(value, &ext_len);
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| 241 | else if (gen_type == 2)
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| 242 | ext_der = generic_asn1(value, ctx, &ext_len);
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| 243 |
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| 244 | if (ext_der == NULL) {
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| 245 | X509V3err(X509V3_F_V3_GENERIC_EXTENSION,
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| 246 | X509V3_R_EXTENSION_VALUE_ERROR);
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| 247 | ERR_add_error_data(2, "value=", value);
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| 248 | goto err;
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| 249 | }
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| 250 |
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| 251 | if ((oct = ASN1_OCTET_STRING_new()) == NULL) {
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| 252 | X509V3err(X509V3_F_V3_GENERIC_EXTENSION, ERR_R_MALLOC_FAILURE);
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| 253 | goto err;
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| 254 | }
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| 255 |
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| 256 | oct->data = ext_der;
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| 257 | oct->length = ext_len;
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| 258 | ext_der = NULL;
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| 259 |
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| 260 | extension = X509_EXTENSION_create_by_OBJ(NULL, obj, crit, oct);
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| 261 |
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| 262 | err:
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| 263 | ASN1_OBJECT_free(obj);
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| 264 | ASN1_OCTET_STRING_free(oct);
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| 265 | OPENSSL_free(ext_der);
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| 266 | return extension;
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| 267 |
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| 268 | }
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| 269 |
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| 270 | static unsigned char *generic_asn1(const char *value, X509V3_CTX *ctx,
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| 271 | long *ext_len)
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| 272 | {
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| 273 | ASN1_TYPE *typ;
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| 274 | unsigned char *ext_der = NULL;
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| 275 | typ = ASN1_generate_v3(value, ctx);
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| 276 | if (typ == NULL)
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| 277 | return NULL;
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| 278 | *ext_len = i2d_ASN1_TYPE(typ, &ext_der);
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| 279 | ASN1_TYPE_free(typ);
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| 280 | return ext_der;
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| 281 | }
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| 282 |
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| 283 | static void delete_ext(STACK_OF(X509_EXTENSION) *sk, X509_EXTENSION *dext)
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| 284 | {
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| 285 | int idx;
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| 286 | ASN1_OBJECT *obj;
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| 287 | obj = X509_EXTENSION_get_object(dext);
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| 288 | while ((idx = X509v3_get_ext_by_OBJ(sk, obj, -1)) >= 0) {
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| 289 | X509_EXTENSION *tmpext = X509v3_get_ext(sk, idx);
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| 290 | X509v3_delete_ext(sk, idx);
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| 291 | X509_EXTENSION_free(tmpext);
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| 292 | }
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| 293 | }
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| 294 |
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| 295 | /*
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| 296 | * This is the main function: add a bunch of extensions based on a config
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| 297 | * file section to an extension STACK.
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| 298 | */
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| 299 |
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| 300 | int X509V3_EXT_add_nconf_sk(CONF *conf, X509V3_CTX *ctx, const char *section,
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| 301 | STACK_OF(X509_EXTENSION) **sk)
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| 302 | {
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| 303 | X509_EXTENSION *ext;
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| 304 | STACK_OF(CONF_VALUE) *nval;
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| 305 | CONF_VALUE *val;
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| 306 | int i;
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| 307 |
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| 308 | if ((nval = NCONF_get_section(conf, section)) == NULL)
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| 309 | return 0;
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| 310 | for (i = 0; i < sk_CONF_VALUE_num(nval); i++) {
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| 311 | val = sk_CONF_VALUE_value(nval, i);
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| 312 | if ((ext = X509V3_EXT_nconf(conf, ctx, val->name, val->value)) == NULL)
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| 313 | return 0;
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| 314 | if (ctx->flags == X509V3_CTX_REPLACE)
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| 315 | delete_ext(*sk, ext);
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| 316 | if (sk)
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| 317 | X509v3_add_ext(sk, ext, -1);
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| 318 | X509_EXTENSION_free(ext);
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| 319 | }
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| 320 | return 1;
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| 321 | }
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| 322 |
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| 323 | /*
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| 324 | * Convenience functions to add extensions to a certificate, CRL and request
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| 325 | */
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| 326 |
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| 327 | int X509V3_EXT_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
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| 328 | X509 *cert)
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| 329 | {
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| 330 | STACK_OF(X509_EXTENSION) **sk = NULL;
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| 331 | if (cert)
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| 332 | sk = &cert->cert_info.extensions;
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| 333 | return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
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| 334 | }
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| 335 |
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| 336 | /* Same as above but for a CRL */
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| 337 |
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| 338 | int X509V3_EXT_CRL_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
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| 339 | X509_CRL *crl)
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| 340 | {
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| 341 | STACK_OF(X509_EXTENSION) **sk = NULL;
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| 342 | if (crl)
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| 343 | sk = &crl->crl.extensions;
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| 344 | return X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
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| 345 | }
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| 346 |
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| 347 | /* Add extensions to certificate request */
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| 348 |
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| 349 | int X509V3_EXT_REQ_add_nconf(CONF *conf, X509V3_CTX *ctx, const char *section,
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| 350 | X509_REQ *req)
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| 351 | {
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| 352 | STACK_OF(X509_EXTENSION) *extlist = NULL, **sk = NULL;
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| 353 | int i;
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| 354 | if (req)
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| 355 | sk = &extlist;
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| 356 | i = X509V3_EXT_add_nconf_sk(conf, ctx, section, sk);
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| 357 | if (!i || !sk)
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| 358 | return i;
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| 359 | i = X509_REQ_add_extensions(req, extlist);
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| 360 | sk_X509_EXTENSION_pop_free(extlist, X509_EXTENSION_free);
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| 361 | return i;
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| 362 | }
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| 363 |
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| 364 | /* Config database functions */
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| 365 |
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| 366 | char *X509V3_get_string(X509V3_CTX *ctx, const char *name, const char *section)
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| 367 | {
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| 368 | if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_string) {
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| 369 | X509V3err(X509V3_F_X509V3_GET_STRING, X509V3_R_OPERATION_NOT_DEFINED);
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| 370 | return NULL;
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| 371 | }
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| 372 | if (ctx->db_meth->get_string)
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| 373 | return ctx->db_meth->get_string(ctx->db, name, section);
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| 374 | return NULL;
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| 375 | }
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| 376 |
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| 377 | STACK_OF(CONF_VALUE) *X509V3_get_section(X509V3_CTX *ctx, const char *section)
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| 378 | {
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| 379 | if (!ctx->db || !ctx->db_meth || !ctx->db_meth->get_section) {
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| 380 | X509V3err(X509V3_F_X509V3_GET_SECTION,
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| 381 | X509V3_R_OPERATION_NOT_DEFINED);
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| 382 | return NULL;
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| 383 | }
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| 384 | if (ctx->db_meth->get_section)
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| 385 | return ctx->db_meth->get_section(ctx->db, section);
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| 386 | return NULL;
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| 387 | }
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| 388 |
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| 389 | void X509V3_string_free(X509V3_CTX *ctx, char *str)
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| 390 | {
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| 391 | if (!str)
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| 392 | return;
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| 393 | if (ctx->db_meth->free_string)
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| 394 | ctx->db_meth->free_string(ctx->db, str);
|
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| 395 | }
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| 396 |
|
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| 397 | void X509V3_section_free(X509V3_CTX *ctx, STACK_OF(CONF_VALUE) *section)
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| 398 | {
|
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| 399 | if (!section)
|
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| 400 | return;
|
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| 401 | if (ctx->db_meth->free_section)
|
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| 402 | ctx->db_meth->free_section(ctx->db, section);
|
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| 403 | }
|
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| 404 |
|
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| 405 | static char *nconf_get_string(void *db, const char *section, const char *value)
|
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| 406 | {
|
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| 407 | return NCONF_get_string(db, section, value);
|
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| 408 | }
|
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| 409 |
|
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| 410 | static STACK_OF(CONF_VALUE) *nconf_get_section(void *db, const char *section)
|
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| 411 | {
|
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| 412 | return NCONF_get_section(db, section);
|
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| 413 | }
|
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| 414 |
|
---|
| 415 | static X509V3_CONF_METHOD nconf_method = {
|
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| 416 | nconf_get_string,
|
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| 417 | nconf_get_section,
|
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| 418 | NULL,
|
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| 419 | NULL
|
---|
| 420 | };
|
---|
| 421 |
|
---|
| 422 | void X509V3_set_nconf(X509V3_CTX *ctx, CONF *conf)
|
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| 423 | {
|
---|
| 424 | ctx->db_meth = &nconf_method;
|
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| 425 | ctx->db = conf;
|
---|
| 426 | }
|
---|
| 427 |
|
---|
| 428 | void X509V3_set_ctx(X509V3_CTX *ctx, X509 *issuer, X509 *subj, X509_REQ *req,
|
---|
| 429 | X509_CRL *crl, int flags)
|
---|
| 430 | {
|
---|
| 431 | ctx->issuer_cert = issuer;
|
---|
| 432 | ctx->subject_cert = subj;
|
---|
| 433 | ctx->crl = crl;
|
---|
| 434 | ctx->subject_req = req;
|
---|
| 435 | ctx->flags = flags;
|
---|
| 436 | }
|
---|
| 437 |
|
---|
| 438 | /* Old conf compatibility functions */
|
---|
| 439 |
|
---|
| 440 | X509_EXTENSION *X509V3_EXT_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
|
---|
| 441 | const char *name, const char *value)
|
---|
| 442 | {
|
---|
| 443 | CONF ctmp;
|
---|
| 444 | CONF_set_nconf(&ctmp, conf);
|
---|
| 445 | return X509V3_EXT_nconf(&ctmp, ctx, name, value);
|
---|
| 446 | }
|
---|
| 447 |
|
---|
| 448 | /* LHASH *conf: Config file */
|
---|
| 449 | /* char *value: Value */
|
---|
| 450 | X509_EXTENSION *X509V3_EXT_conf_nid(LHASH_OF(CONF_VALUE) *conf,
|
---|
| 451 | X509V3_CTX *ctx, int ext_nid, const char *value)
|
---|
| 452 | {
|
---|
| 453 | CONF ctmp;
|
---|
| 454 | CONF_set_nconf(&ctmp, conf);
|
---|
| 455 | return X509V3_EXT_nconf_nid(&ctmp, ctx, ext_nid, value);
|
---|
| 456 | }
|
---|
| 457 |
|
---|
| 458 | static char *conf_lhash_get_string(void *db, const char *section, const char *value)
|
---|
| 459 | {
|
---|
| 460 | return CONF_get_string(db, section, value);
|
---|
| 461 | }
|
---|
| 462 |
|
---|
| 463 | static STACK_OF(CONF_VALUE) *conf_lhash_get_section(void *db, const char *section)
|
---|
| 464 | {
|
---|
| 465 | return CONF_get_section(db, section);
|
---|
| 466 | }
|
---|
| 467 |
|
---|
| 468 | static X509V3_CONF_METHOD conf_lhash_method = {
|
---|
| 469 | conf_lhash_get_string,
|
---|
| 470 | conf_lhash_get_section,
|
---|
| 471 | NULL,
|
---|
| 472 | NULL
|
---|
| 473 | };
|
---|
| 474 |
|
---|
| 475 | void X509V3_set_conf_lhash(X509V3_CTX *ctx, LHASH_OF(CONF_VALUE) *lhash)
|
---|
| 476 | {
|
---|
| 477 | ctx->db_meth = &conf_lhash_method;
|
---|
| 478 | ctx->db = lhash;
|
---|
| 479 | }
|
---|
| 480 |
|
---|
| 481 | int X509V3_EXT_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
|
---|
| 482 | const char *section, X509 *cert)
|
---|
| 483 | {
|
---|
| 484 | CONF ctmp;
|
---|
| 485 | CONF_set_nconf(&ctmp, conf);
|
---|
| 486 | return X509V3_EXT_add_nconf(&ctmp, ctx, section, cert);
|
---|
| 487 | }
|
---|
| 488 |
|
---|
| 489 | /* Same as above but for a CRL */
|
---|
| 490 |
|
---|
| 491 | int X509V3_EXT_CRL_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
|
---|
| 492 | const char *section, X509_CRL *crl)
|
---|
| 493 | {
|
---|
| 494 | CONF ctmp;
|
---|
| 495 | CONF_set_nconf(&ctmp, conf);
|
---|
| 496 | return X509V3_EXT_CRL_add_nconf(&ctmp, ctx, section, crl);
|
---|
| 497 | }
|
---|
| 498 |
|
---|
| 499 | /* Add extensions to certificate request */
|
---|
| 500 |
|
---|
| 501 | int X509V3_EXT_REQ_add_conf(LHASH_OF(CONF_VALUE) *conf, X509V3_CTX *ctx,
|
---|
| 502 | const char *section, X509_REQ *req)
|
---|
| 503 | {
|
---|
| 504 | CONF ctmp;
|
---|
| 505 | CONF_set_nconf(&ctmp, conf);
|
---|
| 506 | return X509V3_EXT_REQ_add_nconf(&ctmp, ctx, section, req);
|
---|
| 507 | }
|
---|