2 * Copyright 2020-2021 The OpenSSL Project Authors. All Rights Reserved.
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
11 * RSA low level APIs are deprecated for public use, but still ok for
14 #include "internal/deprecated.h"
18 #include <openssl/core_dispatch.h>
19 #include <openssl/core_names.h>
20 #include <openssl/core_object.h>
21 #include <openssl/crypto.h>
22 #include <openssl/err.h>
23 #include <openssl/params.h>
24 #include <openssl/pem.h>
25 #include <openssl/proverr.h>
26 #include "internal/nelem.h"
28 #include "prov/implementations.h"
29 #include "endecoder_local.h"
31 static int read_pem(PROV_CTX *provctx, OSSL_CORE_BIO *cin,
32 char **pem_name, char **pem_header,
33 unsigned char **data, long *len)
35 BIO *in = bio_new_from_core_bio(provctx, cin);
36 int ok = (PEM_read_bio(in, pem_name, pem_header, data, len) > 0);
42 static OSSL_FUNC_decoder_newctx_fn pem2der_newctx;
43 static OSSL_FUNC_decoder_freectx_fn pem2der_freectx;
44 static OSSL_FUNC_decoder_gettable_params_fn pem2der_gettable_params;
45 static OSSL_FUNC_decoder_get_params_fn pem2der_get_params;
46 static OSSL_FUNC_decoder_decode_fn pem2der_decode;
49 * Context used for PEM to DER decoding.
51 struct pem2der_ctx_st {
55 static void *pem2der_newctx(void *provctx)
57 struct pem2der_ctx_st *ctx = OPENSSL_zalloc(sizeof(*ctx));
60 ctx->provctx = provctx;
64 static void pem2der_freectx(void *vctx)
66 struct pem2der_ctx_st *ctx = vctx;
71 static const OSSL_PARAM *pem2der_gettable_params(void *provctx)
73 static const OSSL_PARAM gettables[] = {
74 { OSSL_DECODER_PARAM_INPUT_TYPE, OSSL_PARAM_UTF8_PTR, NULL, 0, 0 },
81 static int pem2der_get_params(OSSL_PARAM params[])
85 p = OSSL_PARAM_locate(params, OSSL_DECODER_PARAM_INPUT_TYPE);
86 if (p != NULL && !OSSL_PARAM_set_utf8_ptr(p, "PEM"))
92 /* pem_password_cb compatible function */
93 struct pem2der_pass_data_st {
94 OSSL_PASSPHRASE_CALLBACK *cb;
98 static int pem2der_pass_helper(char *buf, int num, int w, void *data)
100 struct pem2der_pass_data_st *pass_data = data;
103 if (pass_data == NULL
104 || pass_data->cb == NULL
105 || !pass_data->cb(buf, num, &plen, NULL, pass_data->cbarg))
111 * The selection parameter in pem2der_decode() is not used by this function
112 * because it's not relevant just to decode PEM to DER.
114 static int pem2der_decode(void *vctx, OSSL_CORE_BIO *cin, int selection,
115 OSSL_CALLBACK *data_cb, void *data_cbarg,
116 OSSL_PASSPHRASE_CALLBACK *pw_cb, void *pw_cbarg)
118 /* Strings to peel off the pem name */
119 static struct peelablee_pem_name_endings_st {
121 const char *data_structure;
122 } peelable_pem_name_endings[] = {
124 * These entries should be in longest to shortest order to avoid
127 { "ENCRYPTED PRIVATE KEY", "pkcs8" },
128 { "PRIVATE KEY", "pkcs8" },
129 { "PUBLIC KEY", "SubjectPublicKeyInfo" },
130 { "PARAMETERS", NULL }
133 * Libcrypto currently only supports decoding keys with provider side
134 * decoders, so we don't try to peel any other PEM name. That's an
135 * exercise for when libcrypto starts to treat other types of objects
139 struct pem2der_ctx_st *ctx = vctx;
140 char *pem_name = NULL, *pem_header = NULL;
141 size_t pem_name_len, i;
142 unsigned char *der = NULL;
145 int objtype = OSSL_OBJECT_UNKNOWN;
146 const char *data_structure = NULL;
148 if (read_pem(ctx->provctx, cin, &pem_name, &pem_header,
149 &der, &der_len) <= 0)
153 * 10 is the number of characters in "Proc-Type:", which
154 * PEM_get_EVP_CIPHER_INFO() requires to be present.
155 * If the PEM header has less characters than that, it's
156 * not worth spending cycles on it.
158 if (strlen(pem_header) > 10) {
159 EVP_CIPHER_INFO cipher;
160 struct pem2der_pass_data_st pass_data;
162 pass_data.cb = pw_cb;
163 pass_data.cbarg = pw_cbarg;
164 if (!PEM_get_EVP_CIPHER_INFO(pem_header, &cipher)
165 || !PEM_do_header(&cipher, der, &der_len,
166 pem2der_pass_helper, &pass_data))
171 * Peal off certain strings from the end of |pem_name|, as they serve
172 * no further purpose.
174 for (i = 0, pem_name_len = strlen(pem_name);
175 i < OSSL_NELEM(peelable_pem_name_endings);
177 size_t peel_len = strlen(peelable_pem_name_endings[i].ending);
178 size_t pem_name_offset;
180 if (peel_len <= pem_name_len) {
181 pem_name_offset = pem_name_len - peel_len;
182 if (strcmp(pem_name + pem_name_offset,
183 peelable_pem_name_endings[i].ending) == 0) {
186 pem_name[pem_name_offset] = '\0';
187 } while (pem_name_offset > 0
188 && pem_name[--pem_name_offset] == ' ');
190 if (pem_name[0] == '\0') {
191 OPENSSL_free(pem_name);
194 /* All of these peelable endings are for EVP_PKEYs */
195 objtype = OSSL_OBJECT_PKEY;
196 if (pem_name == NULL) {
197 data_structure = peelable_pem_name_endings[i].data_structure;
198 if (data_structure == NULL)
202 * If there is an algorithm name prefix then it is a
203 * type-specific data structure
205 data_structure = "type-specific";
212 /* If we don't know the object type yet check if it's one we know about */
213 if (objtype == OSSL_OBJECT_UNKNOWN) {
214 if (strcmp(pem_name, PEM_STRING_X509) == 0
215 || strcmp(pem_name, PEM_STRING_X509_TRUSTED) == 0
216 || strcmp(pem_name, PEM_STRING_X509_OLD) == 0)
217 objtype = OSSL_OBJECT_CERT;
218 else if (strcmp(pem_name, PEM_STRING_X509_CRL) == 0)
219 objtype = OSSL_OBJECT_CRL;
223 OSSL_PARAM params[5], *p = params;
225 if (pem_name != NULL)
227 OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_TYPE,
230 /* We expect this to be read only so casting away the const is ok */
231 if (data_structure != NULL)
233 OSSL_PARAM_construct_utf8_string(OSSL_OBJECT_PARAM_DATA_STRUCTURE,
234 (char *)data_structure, 0);
236 OSSL_PARAM_construct_octet_string(OSSL_OBJECT_PARAM_DATA,
239 OSSL_PARAM_construct_int(OSSL_OBJECT_PARAM_TYPE, &objtype);
241 *p = OSSL_PARAM_construct_end();
243 ok = data_cb(params, data_cbarg);
247 OPENSSL_free(pem_name);
248 OPENSSL_free(pem_header);
253 const OSSL_DISPATCH ossl_pem_to_der_decoder_functions[] = {
254 { OSSL_FUNC_DECODER_NEWCTX, (void (*)(void))pem2der_newctx },
255 { OSSL_FUNC_DECODER_FREECTX, (void (*)(void))pem2der_freectx },
256 { OSSL_FUNC_DECODER_GETTABLE_PARAMS,
257 (void (*)(void))pem2der_gettable_params },
258 { OSSL_FUNC_DECODER_GET_PARAMS,
259 (void (*)(void))pem2der_get_params },
260 { OSSL_FUNC_DECODER_DECODE, (void (*)(void))pem2der_decode },