2 * Copyright 1995-2023 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
10 /* We need to use some deprecated APIs */
11 #define OPENSSL_SUPPRESS_DEPRECATED
14 #include <openssl/buffer.h>
15 #include <openssl/objects.h>
16 #include <openssl/evp.h>
17 #include <openssl/x509.h>
18 #include <openssl/pkcs12.h>
19 #include <openssl/pem.h>
20 #include <openssl/engine.h>
21 #include <openssl/dh.h>
22 #include <openssl/decoder.h>
23 #include <openssl/ui.h>
24 #include "internal/cryptlib.h"
25 #include "internal/passphrase.h"
26 #include "crypto/asn1.h"
27 #include "crypto/x509.h"
28 #include "crypto/evp.h"
29 #include "pem_local.h"
31 int ossl_pem_check_suffix(const char *pem_str, const char *suffix);
33 static EVP_PKEY *pem_read_bio_key_decoder(BIO *bp, EVP_PKEY **x,
34 pem_password_cb *cb, void *u,
39 EVP_PKEY *pkey = NULL;
40 OSSL_DECODER_CTX *dctx = NULL;
43 if ((pos = BIO_tell(bp)) < 0)
44 /* We can depend on BIO_tell() thanks to the BIO_f_readbuffer() */
47 dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, "PEM", NULL, NULL,
48 selection, libctx, propq);
54 cb = PEM_def_callback;
56 if (!OSSL_DECODER_CTX_set_pem_password_cb(dctx, cb, u))
60 while (!OSSL_DECODER_from_bio(dctx, bp) || pkey == NULL)
61 if (BIO_eof(bp) != 0 || (newpos = BIO_tell(bp)) < 0 || newpos <= pos) {
62 ERR_clear_last_mark();
65 if (ERR_GET_REASON(ERR_peek_error()) == ERR_R_UNSUPPORTED) {
66 /* unsupported PEM data, try again */
70 /* other error, bail out */
71 ERR_clear_last_mark();
78 /* if we were asked for private key, the public key is optional */
79 if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
80 selection = selection & ~OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
82 if (!evp_keymgmt_util_has(pkey, selection)) {
85 ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
95 OSSL_DECODER_CTX_free(dctx);
99 static EVP_PKEY *pem_read_bio_key_legacy(BIO *bp, EVP_PKEY **x,
100 pem_password_cb *cb, void *u,
101 OSSL_LIB_CTX *libctx,
106 const unsigned char *p = NULL;
107 unsigned char *data = NULL;
110 EVP_PKEY *ret = NULL;
112 ERR_set_mark(); /* not interested in PEM read errors */
113 if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
114 if (!PEM_bytes_read_bio_secmem(&data, &len, &nm,
121 const char *pem_string = PEM_STRING_PARAMETERS;
123 if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
124 pem_string = PEM_STRING_PUBLIC;
125 if (!PEM_bytes_read_bio(&data, &len, &nm,
132 ERR_clear_last_mark();
135 if (strcmp(nm, PEM_STRING_PKCS8INF) == 0) {
136 PKCS8_PRIV_KEY_INFO *p8inf;
138 if ((p8inf = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, len)) == NULL)
140 ret = evp_pkcs82pkey_legacy(p8inf, libctx, propq);
145 PKCS8_PRIV_KEY_INFO_free(p8inf);
146 } else if (strcmp(nm, PEM_STRING_PKCS8) == 0) {
147 PKCS8_PRIV_KEY_INFO *p8inf;
150 char psbuf[PEM_BUFSIZE];
152 if ((p8 = d2i_X509_SIG(NULL, &p, len)) == NULL)
155 klen = cb(psbuf, PEM_BUFSIZE, 0, u);
157 klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
159 ERR_raise(ERR_LIB_PEM, PEM_R_BAD_PASSWORD_READ);
163 p8inf = PKCS8_decrypt(p8, psbuf, klen);
165 OPENSSL_cleanse(psbuf, klen);
168 ret = evp_pkcs82pkey_legacy(p8inf, libctx, propq);
173 PKCS8_PRIV_KEY_INFO_free(p8inf);
174 } else if ((slen = ossl_pem_check_suffix(nm, "PRIVATE KEY")) > 0) {
175 const EVP_PKEY_ASN1_METHOD *ameth;
176 ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
177 if (ameth == NULL || ameth->old_priv_decode == NULL)
179 ret = ossl_d2i_PrivateKey_legacy(ameth->pkey_id, x, &p, len, libctx,
181 } else if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) == 0
182 && (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
183 /* Trying legacy PUBKEY decoding only if we do not want private key. */
184 ret = ossl_d2i_PUBKEY_legacy(x, &p, len);
185 } else if ((selection & EVP_PKEY_KEYPAIR) == 0
186 && (slen = ossl_pem_check_suffix(nm, "PARAMETERS")) > 0) {
187 /* Trying legacy params decoding only if we do not want a key. */
188 ret = EVP_PKEY_new();
191 if (!EVP_PKEY_set_type_str(ret, nm, slen)
192 || !ret->ameth->param_decode
193 || !ret->ameth->param_decode(ret, &p, len)) {
205 if (ret == NULL && ERR_peek_last_error() == 0)
206 /* ensure some error is reported but do not hide the real one */
207 ERR_raise(ERR_LIB_PEM, ERR_R_ASN1_LIB);
209 OPENSSL_secure_free(nm);
210 OPENSSL_secure_clear_free(data, len);
214 static EVP_PKEY *pem_read_bio_key(BIO *bp, EVP_PKEY **x,
215 pem_password_cb *cb, void *u,
216 OSSL_LIB_CTX *libctx,
220 EVP_PKEY *ret = NULL;
223 struct ossl_passphrase_data_st pwdata = { 0 };
225 if ((pos = BIO_tell(bp)) < 0) {
226 new_bio = BIO_new(BIO_f_readbuffer());
229 bp = BIO_push(new_bio, bp);
234 cb = PEM_def_callback;
236 if (!ossl_pw_set_pem_password_cb(&pwdata, cb, u)
237 || !ossl_pw_enable_passphrase_caching(&pwdata))
241 ret = pem_read_bio_key_decoder(bp, x, ossl_pw_pem_password, &pwdata,
242 libctx, propq, selection);
244 && (BIO_seek(bp, pos) < 0
245 || (ret = pem_read_bio_key_legacy(bp, x,
246 ossl_pw_pem_password, &pwdata,
248 selection)) == NULL))
249 ERR_clear_last_mark();
254 ossl_pw_clear_passphrase_data(&pwdata);
255 if (new_bio != NULL) {
262 EVP_PKEY *PEM_read_bio_PUBKEY_ex(BIO *bp, EVP_PKEY **x,
263 pem_password_cb *cb, void *u,
264 OSSL_LIB_CTX *libctx, const char *propq)
266 return pem_read_bio_key(bp, x, cb, u, libctx, propq,
267 EVP_PKEY_PUBLIC_KEY);
270 EVP_PKEY *PEM_read_bio_PUBKEY(BIO *bp, EVP_PKEY **x, pem_password_cb *cb,
273 return PEM_read_bio_PUBKEY_ex(bp, x, cb, u, NULL, NULL);
276 #ifndef OPENSSL_NO_STDIO
277 EVP_PKEY *PEM_read_PUBKEY_ex(FILE *fp, EVP_PKEY **x,
278 pem_password_cb *cb, void *u,
279 OSSL_LIB_CTX *libctx, const char *propq)
284 if ((b = BIO_new(BIO_s_file())) == NULL) {
285 ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
288 BIO_set_fp(b, fp, BIO_NOCLOSE);
289 ret = PEM_read_bio_PUBKEY_ex(b, x, cb, u, libctx, propq);
294 EVP_PKEY *PEM_read_PUBKEY(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u)
296 return PEM_read_PUBKEY_ex(fp, x, cb, u, NULL, NULL);
300 EVP_PKEY *PEM_read_bio_PrivateKey_ex(BIO *bp, EVP_PKEY **x,
301 pem_password_cb *cb, void *u,
302 OSSL_LIB_CTX *libctx, const char *propq)
304 return pem_read_bio_key(bp, x, cb, u, libctx, propq,
305 /* we also want the public key, if available */
309 EVP_PKEY *PEM_read_bio_PrivateKey(BIO *bp, EVP_PKEY **x, pem_password_cb *cb,
312 return PEM_read_bio_PrivateKey_ex(bp, x, cb, u, NULL, NULL);
315 PEM_write_cb_ex_fnsig(PrivateKey, EVP_PKEY, BIO, write_bio)
317 IMPLEMENT_PEM_provided_write_body_vars(pkey, PrivateKey, propq);
319 IMPLEMENT_PEM_provided_write_body_pass();
320 IMPLEMENT_PEM_provided_write_body_main(pkey, bio);
323 if (x != NULL && (x->ameth == NULL || x->ameth->priv_encode != NULL))
324 return PEM_write_bio_PKCS8PrivateKey(out, x, enc,
325 (const char *)kstr, klen, cb, u);
326 return PEM_write_bio_PrivateKey_traditional(out, x, enc, kstr, klen, cb, u);
329 PEM_write_cb_fnsig(PrivateKey, EVP_PKEY, BIO, write_bio)
331 return PEM_write_bio_PrivateKey_ex(out, x, enc, kstr, klen, cb, u,
336 * Note: there is no way to tell a provided pkey encoder to use "traditional"
337 * encoding. Therefore, if the pkey is provided, we try to take a copy
339 int PEM_write_bio_PrivateKey_traditional(BIO *bp, const EVP_PKEY *x,
340 const EVP_CIPHER *enc,
341 const unsigned char *kstr, int klen,
342 pem_password_cb *cb, void *u)
345 EVP_PKEY *copy = NULL;
351 if (evp_pkey_is_assigned(x)
352 && evp_pkey_is_provided(x)
353 && evp_pkey_copy_downgraded(©, x))
356 if (x->ameth == NULL || x->ameth->old_priv_encode == NULL) {
357 ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
361 BIO_snprintf(pem_str, 80, "%s PRIVATE KEY", x->ameth->pem_str);
362 ret = PEM_ASN1_write_bio((i2d_of_void *)i2d_PrivateKey,
363 pem_str, bp, x, enc, kstr, klen, cb, u);
369 static int no_password_cb(char *buf, int num, int rwflag, void *userdata)
374 EVP_PKEY *PEM_read_bio_Parameters_ex(BIO *bp, EVP_PKEY **x,
375 OSSL_LIB_CTX *libctx, const char *propq)
378 * PEM_read_bio_Parameters(_ex) should never ask for a password. Any attempt
379 * to get a password just fails.
381 return pem_read_bio_key(bp, x, no_password_cb, NULL, libctx, propq,
382 EVP_PKEY_KEY_PARAMETERS);
385 EVP_PKEY *PEM_read_bio_Parameters(BIO *bp, EVP_PKEY **x)
387 return PEM_read_bio_Parameters_ex(bp, x, NULL, NULL);
390 PEM_write_fnsig(Parameters, EVP_PKEY, BIO, write_bio)
393 IMPLEMENT_PEM_provided_write_body_vars(pkey, Parameters, NULL);
395 IMPLEMENT_PEM_provided_write_body_main(pkey, bio);
398 if (!x->ameth || !x->ameth->param_encode)
401 BIO_snprintf(pem_str, 80, "%s PARAMETERS", x->ameth->pem_str);
402 return PEM_ASN1_write_bio((i2d_of_void *)x->ameth->param_encode,
403 pem_str, out, x, NULL, NULL, 0, 0, NULL);
406 #ifndef OPENSSL_NO_STDIO
407 EVP_PKEY *PEM_read_PrivateKey_ex(FILE *fp, EVP_PKEY **x, pem_password_cb *cb,
408 void *u, OSSL_LIB_CTX *libctx,
414 if ((b = BIO_new(BIO_s_file())) == NULL) {
415 ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
418 BIO_set_fp(b, fp, BIO_NOCLOSE);
419 ret = PEM_read_bio_PrivateKey_ex(b, x, cb, u, libctx, propq);
424 EVP_PKEY *PEM_read_PrivateKey(FILE *fp, EVP_PKEY **x, pem_password_cb *cb,
427 return PEM_read_PrivateKey_ex(fp, x, cb, u, NULL, NULL);
430 PEM_write_cb_ex_fnsig(PrivateKey, EVP_PKEY, FILE, write)
435 if ((b = BIO_new_fp(out, BIO_NOCLOSE)) == NULL) {
436 ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
439 ret = PEM_write_bio_PrivateKey_ex(b, x, enc, kstr, klen, cb, u,
445 PEM_write_cb_fnsig(PrivateKey, EVP_PKEY, FILE, write)
447 return PEM_write_PrivateKey_ex(out, x, enc, kstr, klen, cb, u, NULL, NULL);