450 lines
14 KiB
C
450 lines
14 KiB
C
/*
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* Copyright 1995-2023 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/* We need to use some deprecated APIs */
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#define OPENSSL_SUPPRESS_DEPRECATED
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#include <stdio.h>
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#include <openssl/buffer.h>
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#include <openssl/objects.h>
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#include <openssl/evp.h>
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#include <openssl/x509.h>
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#include <openssl/pkcs12.h>
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#include <openssl/pem.h>
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#include <openssl/engine.h>
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#include <openssl/dh.h>
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#include <openssl/decoder.h>
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#include <openssl/ui.h>
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#include "internal/cryptlib.h"
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#include "internal/passphrase.h"
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#include "crypto/asn1.h"
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#include "crypto/x509.h"
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#include "crypto/evp.h"
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#include "pem_local.h"
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int ossl_pem_check_suffix(const char *pem_str, const char *suffix);
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static EVP_PKEY *pem_read_bio_key_decoder(BIO *bp, EVP_PKEY **x,
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pem_password_cb *cb, void *u,
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OSSL_LIB_CTX *libctx,
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const char *propq,
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int selection)
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{
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EVP_PKEY *pkey = NULL;
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OSSL_DECODER_CTX *dctx = NULL;
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int pos, newpos;
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if ((pos = BIO_tell(bp)) < 0)
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/* We can depend on BIO_tell() thanks to the BIO_f_readbuffer() */
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return NULL;
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dctx = OSSL_DECODER_CTX_new_for_pkey(&pkey, "PEM", NULL, NULL,
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selection, libctx, propq);
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if (dctx == NULL)
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return NULL;
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if (cb == NULL)
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cb = PEM_def_callback;
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if (!OSSL_DECODER_CTX_set_pem_password_cb(dctx, cb, u))
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goto err;
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ERR_set_mark();
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while (!OSSL_DECODER_from_bio(dctx, bp) || pkey == NULL)
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if (BIO_eof(bp) != 0 || (newpos = BIO_tell(bp)) < 0 || newpos <= pos) {
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ERR_clear_last_mark();
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goto err;
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} else {
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if (ERR_GET_REASON(ERR_peek_error()) == ERR_R_UNSUPPORTED) {
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/* unsupported PEM data, try again */
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ERR_pop_to_mark();
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ERR_set_mark();
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} else {
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/* other error, bail out */
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ERR_clear_last_mark();
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goto err;
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}
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pos = newpos;
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}
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ERR_pop_to_mark();
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/* if we were asked for private key, the public key is optional */
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if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0)
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selection = selection & ~OSSL_KEYMGMT_SELECT_PUBLIC_KEY;
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if (!evp_keymgmt_util_has(pkey, selection)) {
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EVP_PKEY_free(pkey);
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pkey = NULL;
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ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
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goto err;
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}
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if (x != NULL) {
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EVP_PKEY_free(*x);
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*x = pkey;
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}
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err:
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OSSL_DECODER_CTX_free(dctx);
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return pkey;
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}
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static EVP_PKEY *pem_read_bio_key_legacy(BIO *bp, EVP_PKEY **x,
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pem_password_cb *cb, void *u,
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OSSL_LIB_CTX *libctx,
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const char *propq,
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int selection)
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{
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char *nm = NULL;
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const unsigned char *p = NULL;
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unsigned char *data = NULL;
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long len;
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int slen;
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EVP_PKEY *ret = NULL;
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ERR_set_mark(); /* not interested in PEM read errors */
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if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) != 0) {
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if (!PEM_bytes_read_bio_secmem(&data, &len, &nm,
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PEM_STRING_EVP_PKEY,
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bp, cb, u)) {
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ERR_pop_to_mark();
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return NULL;
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}
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} else {
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const char *pem_string = PEM_STRING_PARAMETERS;
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if ((selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0)
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pem_string = PEM_STRING_PUBLIC;
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if (!PEM_bytes_read_bio(&data, &len, &nm,
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pem_string,
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bp, cb, u)) {
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ERR_pop_to_mark();
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return NULL;
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}
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}
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ERR_clear_last_mark();
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p = data;
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if (strcmp(nm, PEM_STRING_PKCS8INF) == 0) {
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PKCS8_PRIV_KEY_INFO *p8inf;
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if ((p8inf = d2i_PKCS8_PRIV_KEY_INFO(NULL, &p, len)) == NULL)
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goto p8err;
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ret = evp_pkcs82pkey_legacy(p8inf, libctx, propq);
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if (x != NULL) {
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EVP_PKEY_free(*x);
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*x = ret;
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}
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PKCS8_PRIV_KEY_INFO_free(p8inf);
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} else if (strcmp(nm, PEM_STRING_PKCS8) == 0) {
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PKCS8_PRIV_KEY_INFO *p8inf;
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X509_SIG *p8;
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int klen;
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char psbuf[PEM_BUFSIZE];
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if ((p8 = d2i_X509_SIG(NULL, &p, len)) == NULL)
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goto p8err;
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if (cb != NULL)
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klen = cb(psbuf, PEM_BUFSIZE, 0, u);
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else
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klen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
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if (klen < 0) {
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ERR_raise(ERR_LIB_PEM, PEM_R_BAD_PASSWORD_READ);
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X509_SIG_free(p8);
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goto err;
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}
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p8inf = PKCS8_decrypt(p8, psbuf, klen);
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X509_SIG_free(p8);
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OPENSSL_cleanse(psbuf, klen);
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if (p8inf == NULL)
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goto p8err;
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ret = evp_pkcs82pkey_legacy(p8inf, libctx, propq);
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if (x != NULL) {
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EVP_PKEY_free(*x);
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*x = ret;
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}
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PKCS8_PRIV_KEY_INFO_free(p8inf);
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} else if ((slen = ossl_pem_check_suffix(nm, "PRIVATE KEY")) > 0) {
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const EVP_PKEY_ASN1_METHOD *ameth;
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ameth = EVP_PKEY_asn1_find_str(NULL, nm, slen);
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if (ameth == NULL || ameth->old_priv_decode == NULL)
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goto p8err;
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ret = ossl_d2i_PrivateKey_legacy(ameth->pkey_id, x, &p, len, libctx,
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propq);
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} else if ((selection & OSSL_KEYMGMT_SELECT_PRIVATE_KEY) == 0
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&& (selection & OSSL_KEYMGMT_SELECT_PUBLIC_KEY) != 0) {
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/* Trying legacy PUBKEY decoding only if we do not want private key. */
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ret = ossl_d2i_PUBKEY_legacy(x, &p, len);
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} else if ((selection & EVP_PKEY_KEYPAIR) == 0
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&& (slen = ossl_pem_check_suffix(nm, "PARAMETERS")) > 0) {
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/* Trying legacy params decoding only if we do not want a key. */
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ret = EVP_PKEY_new();
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if (ret == NULL)
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goto err;
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if (!EVP_PKEY_set_type_str(ret, nm, slen)
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|| !ret->ameth->param_decode
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|| !ret->ameth->param_decode(ret, &p, len)) {
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EVP_PKEY_free(ret);
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ret = NULL;
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goto err;
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}
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if (x) {
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EVP_PKEY_free(*x);
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*x = ret;
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}
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}
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p8err:
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if (ret == NULL && ERR_peek_last_error() == 0)
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/* ensure some error is reported but do not hide the real one */
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ERR_raise(ERR_LIB_PEM, ERR_R_ASN1_LIB);
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err:
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OPENSSL_secure_free(nm);
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OPENSSL_secure_clear_free(data, len);
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return ret;
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}
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static EVP_PKEY *pem_read_bio_key(BIO *bp, EVP_PKEY **x,
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pem_password_cb *cb, void *u,
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OSSL_LIB_CTX *libctx,
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const char *propq,
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int selection)
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{
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EVP_PKEY *ret = NULL;
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BIO *new_bio = NULL;
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int pos;
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struct ossl_passphrase_data_st pwdata = { 0 };
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if ((pos = BIO_tell(bp)) < 0) {
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new_bio = BIO_new(BIO_f_readbuffer());
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if (new_bio == NULL)
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return NULL;
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bp = BIO_push(new_bio, bp);
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pos = BIO_tell(bp);
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}
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if (cb == NULL)
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cb = PEM_def_callback;
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if (!ossl_pw_set_pem_password_cb(&pwdata, cb, u)
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|| !ossl_pw_enable_passphrase_caching(&pwdata))
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goto err;
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ERR_set_mark();
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ret = pem_read_bio_key_decoder(bp, x, ossl_pw_pem_password, &pwdata,
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libctx, propq, selection);
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if (ret == NULL
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&& (BIO_seek(bp, pos) < 0
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|| (ret = pem_read_bio_key_legacy(bp, x,
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ossl_pw_pem_password, &pwdata,
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libctx, propq,
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selection)) == NULL))
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ERR_clear_last_mark();
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else
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ERR_pop_to_mark();
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err:
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ossl_pw_clear_passphrase_data(&pwdata);
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if (new_bio != NULL) {
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BIO_pop(new_bio);
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BIO_free(new_bio);
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}
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return ret;
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}
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EVP_PKEY *PEM_read_bio_PUBKEY_ex(BIO *bp, EVP_PKEY **x,
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pem_password_cb *cb, void *u,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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return pem_read_bio_key(bp, x, cb, u, libctx, propq,
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EVP_PKEY_PUBLIC_KEY);
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}
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EVP_PKEY *PEM_read_bio_PUBKEY(BIO *bp, EVP_PKEY **x, pem_password_cb *cb,
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void *u)
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{
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return PEM_read_bio_PUBKEY_ex(bp, x, cb, u, NULL, NULL);
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}
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#ifndef OPENSSL_NO_STDIO
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EVP_PKEY *PEM_read_PUBKEY_ex(FILE *fp, EVP_PKEY **x,
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pem_password_cb *cb, void *u,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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BIO *b;
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EVP_PKEY *ret;
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if ((b = BIO_new(BIO_s_file())) == NULL) {
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ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
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return 0;
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}
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BIO_set_fp(b, fp, BIO_NOCLOSE);
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ret = PEM_read_bio_PUBKEY_ex(b, x, cb, u, libctx, propq);
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BIO_free(b);
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return ret;
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}
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EVP_PKEY *PEM_read_PUBKEY(FILE *fp, EVP_PKEY **x, pem_password_cb *cb, void *u)
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{
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return PEM_read_PUBKEY_ex(fp, x, cb, u, NULL, NULL);
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}
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#endif
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EVP_PKEY *PEM_read_bio_PrivateKey_ex(BIO *bp, EVP_PKEY **x,
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pem_password_cb *cb, void *u,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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return pem_read_bio_key(bp, x, cb, u, libctx, propq,
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/* we also want the public key, if available */
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EVP_PKEY_KEYPAIR);
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}
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EVP_PKEY *PEM_read_bio_PrivateKey(BIO *bp, EVP_PKEY **x, pem_password_cb *cb,
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void *u)
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{
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return PEM_read_bio_PrivateKey_ex(bp, x, cb, u, NULL, NULL);
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}
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PEM_write_cb_ex_fnsig(PrivateKey, EVP_PKEY, BIO, write_bio)
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{
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IMPLEMENT_PEM_provided_write_body_vars(pkey, PrivateKey, propq);
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IMPLEMENT_PEM_provided_write_body_pass();
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IMPLEMENT_PEM_provided_write_body_main(pkey, bio);
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legacy:
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if (x != NULL && (x->ameth == NULL || x->ameth->priv_encode != NULL))
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return PEM_write_bio_PKCS8PrivateKey(out, x, enc,
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(const char *)kstr, klen, cb, u);
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return PEM_write_bio_PrivateKey_traditional(out, x, enc, kstr, klen, cb, u);
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}
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PEM_write_cb_fnsig(PrivateKey, EVP_PKEY, BIO, write_bio)
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{
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return PEM_write_bio_PrivateKey_ex(out, x, enc, kstr, klen, cb, u,
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NULL, NULL);
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}
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/*
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* Note: there is no way to tell a provided pkey encoder to use "traditional"
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* encoding. Therefore, if the pkey is provided, we try to take a copy
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*/
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int PEM_write_bio_PrivateKey_traditional(BIO *bp, const EVP_PKEY *x,
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const EVP_CIPHER *enc,
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const unsigned char *kstr, int klen,
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pem_password_cb *cb, void *u)
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{
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char pem_str[80];
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EVP_PKEY *copy = NULL;
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int ret;
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if (x == NULL)
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return 0;
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if (evp_pkey_is_assigned(x)
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&& evp_pkey_is_provided(x)
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&& evp_pkey_copy_downgraded(©, x))
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x = copy;
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if (x->ameth == NULL || x->ameth->old_priv_encode == NULL) {
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ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
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EVP_PKEY_free(copy);
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return 0;
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}
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BIO_snprintf(pem_str, 80, "%s PRIVATE KEY", x->ameth->pem_str);
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ret = PEM_ASN1_write_bio((i2d_of_void *)i2d_PrivateKey,
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pem_str, bp, x, enc, kstr, klen, cb, u);
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EVP_PKEY_free(copy);
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return ret;
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}
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static int no_password_cb(char *buf, int num, int rwflag, void *userdata)
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{
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return -1;
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}
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EVP_PKEY *PEM_read_bio_Parameters_ex(BIO *bp, EVP_PKEY **x,
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OSSL_LIB_CTX *libctx, const char *propq)
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{
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/*
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* PEM_read_bio_Parameters(_ex) should never ask for a password. Any attempt
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* to get a password just fails.
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*/
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return pem_read_bio_key(bp, x, no_password_cb, NULL, libctx, propq,
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EVP_PKEY_KEY_PARAMETERS);
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}
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EVP_PKEY *PEM_read_bio_Parameters(BIO *bp, EVP_PKEY **x)
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{
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return PEM_read_bio_Parameters_ex(bp, x, NULL, NULL);
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}
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PEM_write_fnsig(Parameters, EVP_PKEY, BIO, write_bio)
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{
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char pem_str[80];
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IMPLEMENT_PEM_provided_write_body_vars(pkey, Parameters, NULL);
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IMPLEMENT_PEM_provided_write_body_main(pkey, bio);
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legacy:
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if (!x->ameth || !x->ameth->param_encode)
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return 0;
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BIO_snprintf(pem_str, 80, "%s PARAMETERS", x->ameth->pem_str);
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return PEM_ASN1_write_bio((i2d_of_void *)x->ameth->param_encode,
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pem_str, out, x, NULL, NULL, 0, 0, NULL);
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}
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#ifndef OPENSSL_NO_STDIO
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EVP_PKEY *PEM_read_PrivateKey_ex(FILE *fp, EVP_PKEY **x, pem_password_cb *cb,
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void *u, OSSL_LIB_CTX *libctx,
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const char *propq)
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{
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BIO *b;
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EVP_PKEY *ret;
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if ((b = BIO_new(BIO_s_file())) == NULL) {
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ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
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return 0;
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}
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BIO_set_fp(b, fp, BIO_NOCLOSE);
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ret = PEM_read_bio_PrivateKey_ex(b, x, cb, u, libctx, propq);
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BIO_free(b);
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return ret;
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}
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EVP_PKEY *PEM_read_PrivateKey(FILE *fp, EVP_PKEY **x, pem_password_cb *cb,
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void *u)
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{
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return PEM_read_PrivateKey_ex(fp, x, cb, u, NULL, NULL);
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}
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PEM_write_cb_ex_fnsig(PrivateKey, EVP_PKEY, FILE, write)
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{
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BIO *b;
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int ret;
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if ((b = BIO_new_fp(out, BIO_NOCLOSE)) == NULL) {
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ERR_raise(ERR_LIB_PEM, ERR_R_BUF_LIB);
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return 0;
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}
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ret = PEM_write_bio_PrivateKey_ex(b, x, enc, kstr, klen, cb, u,
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libctx, propq);
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BIO_free(b);
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return ret;
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}
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PEM_write_cb_fnsig(PrivateKey, EVP_PKEY, FILE, write)
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{
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return PEM_write_PrivateKey_ex(out, x, enc, kstr, klen, cb, u, NULL, NULL);
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}
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#endif
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