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openssl/crypto/pem/pvkfmt.c
x2018 9dddcd90a1 add checks for the return values of BN_new(), sk_RSA_PRIME_INFO_new_reserve(), 
EVP_PKEY_CTX_new_from_pkey() and EVP_CIPHER_CTX_new().
Otherwise may result in memory errors.

Reviewed-by: Tomas Mraz <tomas@openssl.org>
Reviewed-by: Matt Caswell <matt@openssl.org>
Reviewed-by: Paul Dale <pauli@openssl.org>
(Merged from https://github.com/openssl/openssl/pull/16892)
2021-10-27 08:36:55 +10:00

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/*
* Copyright 2005-2021 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* Support for PVK format keys and related structures (such a PUBLICKEYBLOB
* and PRIVATEKEYBLOB).
*/
/*
* RSA and DSA low level APIs are deprecated for public use, but still ok for
* internal use.
*/
#include "internal/deprecated.h"
#include <openssl/pem.h>
#include <openssl/rand.h>
#include <openssl/bn.h>
#include <openssl/dsa.h>
#include <openssl/rsa.h>
#include <openssl/kdf.h>
#include <openssl/core_names.h>
#include "internal/cryptlib.h"
#include "crypto/pem.h"
#include "crypto/evp.h"
/*
* Utility function: read a DWORD (4 byte unsigned integer) in little endian
* format
*/
static unsigned int read_ledword(const unsigned char **in)
{
const unsigned char *p = *in;
unsigned int ret;
ret = (unsigned int)*p++;
ret |= (unsigned int)*p++ << 8;
ret |= (unsigned int)*p++ << 16;
ret |= (unsigned int)*p++ << 24;
*in = p;
return ret;
}
/*
* Read a BIGNUM in little endian format. The docs say that this should take
* up bitlen/8 bytes.
*/
static int read_lebn(const unsigned char **in, unsigned int nbyte, BIGNUM **r)
{
*r = BN_lebin2bn(*in, nbyte, NULL);
if (*r == NULL)
return 0;
*in += nbyte;
return 1;
}
/*
* Create an EVP_PKEY from a type specific key.
* This takes ownership of |key|, as long as the |evp_type| is acceptable
* (EVP_PKEY_RSA or EVP_PKEY_DSA), even if the resulting EVP_PKEY wasn't
* created.
*/
#define isdss_to_evp_type(isdss) \
(isdss == 0 ? EVP_PKEY_RSA : isdss == 1 ? EVP_PKEY_DSA : EVP_PKEY_NONE)
static EVP_PKEY *evp_pkey_new0_key(void *key, int evp_type)
{
EVP_PKEY *pkey = NULL;
/*
* It's assumed that if |key| is NULL, something went wrong elsewhere
* and suitable errors are already reported.
*/
if (key == NULL)
return NULL;
if (!ossl_assert(evp_type == EVP_PKEY_RSA || evp_type == EVP_PKEY_DSA)) {
ERR_raise(ERR_LIB_PEM, ERR_R_INTERNAL_ERROR);
return NULL;
}
if ((pkey = EVP_PKEY_new()) != NULL) {
switch (evp_type) {
case EVP_PKEY_RSA:
if (EVP_PKEY_set1_RSA(pkey, key))
break;
EVP_PKEY_free(pkey);
pkey = NULL;
break;
#ifndef OPENSSL_NO_DSA
case EVP_PKEY_DSA:
if (EVP_PKEY_set1_DSA(pkey, key))
break;
EVP_PKEY_free(pkey);
pkey = NULL;
break;
#endif
}
}
switch (evp_type) {
case EVP_PKEY_RSA:
RSA_free(key);
break;
#ifndef OPENSSL_NO_DSA
case EVP_PKEY_DSA:
DSA_free(key);
break;
#endif
}
if (pkey == NULL)
ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
return pkey;
}
/* Convert private key blob to EVP_PKEY: RSA and DSA keys supported */
# define MS_PUBLICKEYBLOB 0x6
# define MS_PRIVATEKEYBLOB 0x7
# define MS_RSA1MAGIC 0x31415352L
# define MS_RSA2MAGIC 0x32415352L
# define MS_DSS1MAGIC 0x31535344L
# define MS_DSS2MAGIC 0x32535344L
# define MS_KEYALG_RSA_KEYX 0xa400
# define MS_KEYALG_DSS_SIGN 0x2200
# define MS_KEYTYPE_KEYX 0x1
# define MS_KEYTYPE_SIGN 0x2
/* The PVK file magic number: seems to spell out "bobsfile", who is Bob? */
# define MS_PVKMAGIC 0xb0b5f11eL
/* Salt length for PVK files */
# define PVK_SALTLEN 0x10
/* Maximum length in PVK header */
# define PVK_MAX_KEYLEN 102400
/* Maximum salt length */
# define PVK_MAX_SALTLEN 10240
/*
* Read the MSBLOB header and get relevant data from it.
*
* |pisdss| and |pispub| have a double role, as they can be used for
* discovery as well as to check the the blob meets expectations.
* |*pisdss| is the indicator for whether the key is a DSA key or not.
* |*pispub| is the indicator for whether the key is public or not.
* In both cases, the following input values apply:
*
* 0 Expected to not be what the variable indicates.
* 1 Expected to be what the variable indicates.
* -1 No expectations, this function will assign 0 or 1 depending on
* header data.
*/
int ossl_do_blob_header(const unsigned char **in, unsigned int length,
unsigned int *pmagic, unsigned int *pbitlen,
int *pisdss, int *pispub)
{
const unsigned char *p = *in;
if (length < 16)
return 0;
/* bType */
switch (*p) {
case MS_PUBLICKEYBLOB:
if (*pispub == 0) {
ERR_raise(ERR_LIB_PEM, PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
return 0;
}
*pispub = 1;
break;
case MS_PRIVATEKEYBLOB:
if (*pispub == 1) {
ERR_raise(ERR_LIB_PEM, PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
return 0;
}
*pispub = 0;
break;
default:
return 0;
}
p++;
/* Version */
if (*p++ != 0x2) {
ERR_raise(ERR_LIB_PEM, PEM_R_BAD_VERSION_NUMBER);
return 0;
}
/* Ignore reserved, aiKeyAlg */
p += 6;
*pmagic = read_ledword(&p);
*pbitlen = read_ledword(&p);
/* Consistency check for private vs public */
switch (*pmagic) {
case MS_DSS1MAGIC:
case MS_RSA1MAGIC:
if (*pispub == 0) {
ERR_raise(ERR_LIB_PEM, PEM_R_EXPECTING_PRIVATE_KEY_BLOB);
return 0;
}
break;
case MS_DSS2MAGIC:
case MS_RSA2MAGIC:
if (*pispub == 1) {
ERR_raise(ERR_LIB_PEM, PEM_R_EXPECTING_PUBLIC_KEY_BLOB);
return 0;
}
break;
default:
ERR_raise(ERR_LIB_PEM, PEM_R_BAD_MAGIC_NUMBER);
return -1;
}
/* Check that we got the expected type */
switch (*pmagic) {
case MS_DSS1MAGIC:
case MS_DSS2MAGIC:
if (*pisdss == 0) {
ERR_raise(ERR_LIB_PEM, PEM_R_EXPECTING_DSS_KEY_BLOB);
return 0;
}
*pisdss = 1;
break;
case MS_RSA1MAGIC:
case MS_RSA2MAGIC:
if (*pisdss == 1) {
ERR_raise(ERR_LIB_PEM, PEM_R_EXPECTING_RSA_KEY_BLOB);
return 0;
}
*pisdss = 0;
break;
default:
ERR_raise(ERR_LIB_PEM, PEM_R_BAD_MAGIC_NUMBER);
return -1;
}
*in = p;
return 1;
}
unsigned int ossl_blob_length(unsigned bitlen, int isdss, int ispub)
{
unsigned int nbyte = (bitlen + 7) >> 3;
unsigned int hnbyte = (bitlen + 15) >> 4;
if (isdss) {
/*
* Expected length: 20 for q + 3 components bitlen each + 24 for seed
* structure.
*/
if (ispub)
return 44 + 3 * nbyte;
/*
* Expected length: 20 for q, priv, 2 bitlen components + 24 for seed
* structure.
*/
else
return 64 + 2 * nbyte;
} else {
/* Expected length: 4 for 'e' + 'n' */
if (ispub)
return 4 + nbyte;
else
/*
* Expected length: 4 for 'e' and 7 other components. 2
* components are bitlen size, 5 are bitlen/2
*/
return 4 + 2 * nbyte + 5 * hnbyte;
}
}
static void *do_b2i_key(const unsigned char **in, unsigned int length,
int *isdss, int *ispub)
{
const unsigned char *p = *in;
unsigned int bitlen, magic;
void *key = NULL;
if (ossl_do_blob_header(&p, length, &magic, &bitlen, isdss, ispub) <= 0) {
ERR_raise(ERR_LIB_PEM, PEM_R_KEYBLOB_HEADER_PARSE_ERROR);
return NULL;
}
length -= 16;
if (length < ossl_blob_length(bitlen, *isdss, *ispub)) {
ERR_raise(ERR_LIB_PEM, PEM_R_KEYBLOB_TOO_SHORT);
return NULL;
}
if (!*isdss)
key = ossl_b2i_RSA_after_header(&p, bitlen, *ispub);
#ifndef OPENSSL_NO_DSA
else
key = ossl_b2i_DSA_after_header(&p, bitlen, *ispub);
#endif
if (key == NULL) {
ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
return NULL;
}
return key;
}
EVP_PKEY *ossl_b2i(const unsigned char **in, unsigned int length, int *ispub)
{
int isdss = -1;
void *key = do_b2i_key(in, length, &isdss, ispub);
return evp_pkey_new0_key(key, isdss_to_evp_type(isdss));
}
EVP_PKEY *ossl_b2i_bio(BIO *in, int *ispub)
{
const unsigned char *p;
unsigned char hdr_buf[16], *buf = NULL;
unsigned int bitlen, magic, length;
int isdss = -1;
void *key = NULL;
EVP_PKEY *pkey = NULL;
if (BIO_read(in, hdr_buf, 16) != 16) {
ERR_raise(ERR_LIB_PEM, PEM_R_KEYBLOB_TOO_SHORT);
return NULL;
}
p = hdr_buf;
if (ossl_do_blob_header(&p, 16, &magic, &bitlen, &isdss, ispub) <= 0)
return NULL;
length = ossl_blob_length(bitlen, isdss, *ispub);
if (length > BLOB_MAX_LENGTH) {
ERR_raise(ERR_LIB_PEM, PEM_R_HEADER_TOO_LONG);
return NULL;
}
buf = OPENSSL_malloc(length);
if (buf == NULL) {
ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
goto err;
}
p = buf;
if (BIO_read(in, buf, length) != (int)length) {
ERR_raise(ERR_LIB_PEM, PEM_R_KEYBLOB_TOO_SHORT);
goto err;
}
if (!isdss)
key = ossl_b2i_RSA_after_header(&p, bitlen, *ispub);
#ifndef OPENSSL_NO_DSA
else
key = ossl_b2i_DSA_after_header(&p, bitlen, *ispub);
#endif
if (key == NULL) {
ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_PUBLIC_KEY_TYPE);
goto err;
}
pkey = evp_pkey_new0_key(key, isdss_to_evp_type(isdss));
err:
OPENSSL_free(buf);
return pkey;
}
#ifndef OPENSSL_NO_DSA
DSA *ossl_b2i_DSA_after_header(const unsigned char **in, unsigned int bitlen,
int ispub)
{
const unsigned char *p = *in;
DSA *dsa = NULL;
BN_CTX *ctx = NULL;
BIGNUM *pbn = NULL, *qbn = NULL, *gbn = NULL, *priv_key = NULL;
BIGNUM *pub_key = NULL;
unsigned int nbyte = (bitlen + 7) >> 3;
dsa = DSA_new();
if (dsa == NULL)
goto memerr;
if (!read_lebn(&p, nbyte, &pbn))
goto memerr;
if (!read_lebn(&p, 20, &qbn))
goto memerr;
if (!read_lebn(&p, nbyte, &gbn))
goto memerr;
if (ispub) {
if (!read_lebn(&p, nbyte, &pub_key))
goto memerr;
} else {
if (!read_lebn(&p, 20, &priv_key))
goto memerr;
/* Set constant time flag before public key calculation */
BN_set_flags(priv_key, BN_FLG_CONSTTIME);
/* Calculate public key */
pub_key = BN_new();
if (pub_key == NULL)
goto memerr;
if ((ctx = BN_CTX_new()) == NULL)
goto memerr;
if (!BN_mod_exp(pub_key, gbn, priv_key, pbn, ctx))
goto memerr;
BN_CTX_free(ctx);
ctx = NULL;
}
if (!DSA_set0_pqg(dsa, pbn, qbn, gbn))
goto memerr;
pbn = qbn = gbn = NULL;
if (!DSA_set0_key(dsa, pub_key, priv_key))
goto memerr;
pub_key = priv_key = NULL;
*in = p;
return dsa;
memerr:
ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
DSA_free(dsa);
BN_free(pbn);
BN_free(qbn);
BN_free(gbn);
BN_free(pub_key);
BN_free(priv_key);
BN_CTX_free(ctx);
return NULL;
}
#endif
RSA *ossl_b2i_RSA_after_header(const unsigned char **in, unsigned int bitlen,
int ispub)
{
const unsigned char *pin = *in;
BIGNUM *e = NULL, *n = NULL, *d = NULL;
BIGNUM *p = NULL, *q = NULL, *dmp1 = NULL, *dmq1 = NULL, *iqmp = NULL;
RSA *rsa = NULL;
unsigned int nbyte = (bitlen + 7) >> 3;
unsigned int hnbyte = (bitlen + 15) >> 4;
rsa = RSA_new();
if (rsa == NULL)
goto memerr;
e = BN_new();
if (e == NULL)
goto memerr;
if (!BN_set_word(e, read_ledword(&pin)))
goto memerr;
if (!read_lebn(&pin, nbyte, &n))
goto memerr;
if (!ispub) {
if (!read_lebn(&pin, hnbyte, &p))
goto memerr;
if (!read_lebn(&pin, hnbyte, &q))
goto memerr;
if (!read_lebn(&pin, hnbyte, &dmp1))
goto memerr;
if (!read_lebn(&pin, hnbyte, &dmq1))
goto memerr;
if (!read_lebn(&pin, hnbyte, &iqmp))
goto memerr;
if (!read_lebn(&pin, nbyte, &d))
goto memerr;
if (!RSA_set0_factors(rsa, p, q))
goto memerr;
p = q = NULL;
if (!RSA_set0_crt_params(rsa, dmp1, dmq1, iqmp))
goto memerr;
dmp1 = dmq1 = iqmp = NULL;
}
if (!RSA_set0_key(rsa, n, e, d))
goto memerr;
n = e = d = NULL;
*in = pin;
return rsa;
memerr:
ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
BN_free(e);
BN_free(n);
BN_free(p);
BN_free(q);
BN_free(dmp1);
BN_free(dmq1);
BN_free(iqmp);
BN_free(d);
RSA_free(rsa);
return NULL;
}
EVP_PKEY *b2i_PrivateKey(const unsigned char **in, long length)
{
int ispub = 0;
return ossl_b2i(in, length, &ispub);
}
EVP_PKEY *b2i_PublicKey(const unsigned char **in, long length)
{
int ispub = 1;
return ossl_b2i(in, length, &ispub);
}
EVP_PKEY *b2i_PrivateKey_bio(BIO *in)
{
int ispub = 0;
return ossl_b2i_bio(in, &ispub);
}
EVP_PKEY *b2i_PublicKey_bio(BIO *in)
{
int ispub = 1;
return ossl_b2i_bio(in, &ispub);
}
static void write_ledword(unsigned char **out, unsigned int dw)
{
unsigned char *p = *out;
*p++ = dw & 0xff;
*p++ = (dw >> 8) & 0xff;
*p++ = (dw >> 16) & 0xff;
*p++ = (dw >> 24) & 0xff;
*out = p;
}
static void write_lebn(unsigned char **out, const BIGNUM *bn, int len)
{
BN_bn2lebinpad(bn, *out, len);
*out += len;
}
static int check_bitlen_rsa(const RSA *rsa, int ispub, unsigned int *magic);
static void write_rsa(unsigned char **out, const RSA *rsa, int ispub);
#ifndef OPENSSL_NO_DSA
static int check_bitlen_dsa(const DSA *dsa, int ispub, unsigned int *magic);
static void write_dsa(unsigned char **out, const DSA *dsa, int ispub);
#endif
static int do_i2b(unsigned char **out, const EVP_PKEY *pk, int ispub)
{
unsigned char *p;
unsigned int bitlen = 0, magic = 0, keyalg = 0;
int outlen = -1, noinc = 0;
if (EVP_PKEY_is_a(pk, "RSA")) {
bitlen = check_bitlen_rsa(EVP_PKEY_get0_RSA(pk), ispub, &magic);
keyalg = MS_KEYALG_RSA_KEYX;
#ifndef OPENSSL_NO_DSA
} else if (EVP_PKEY_is_a(pk, "DSA")) {
bitlen = check_bitlen_dsa(EVP_PKEY_get0_DSA(pk), ispub, &magic);
keyalg = MS_KEYALG_DSS_SIGN;
#endif
}
if (bitlen == 0) {
goto end;
}
outlen = 16
+ ossl_blob_length(bitlen, keyalg == MS_KEYALG_DSS_SIGN ? 1 : 0, ispub);
if (out == NULL)
goto end;
if (*out)
p = *out;
else {
if ((p = OPENSSL_malloc(outlen)) == NULL) {
ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
outlen = -1;
goto end;
}
*out = p;
noinc = 1;
}
if (ispub)
*p++ = MS_PUBLICKEYBLOB;
else
*p++ = MS_PRIVATEKEYBLOB;
*p++ = 0x2;
*p++ = 0;
*p++ = 0;
write_ledword(&p, keyalg);
write_ledword(&p, magic);
write_ledword(&p, bitlen);
if (keyalg == MS_KEYALG_RSA_KEYX)
write_rsa(&p, EVP_PKEY_get0_RSA(pk), ispub);
#ifndef OPENSSL_NO_DSA
else
write_dsa(&p, EVP_PKEY_get0_DSA(pk), ispub);
#endif
if (!noinc)
*out += outlen;
end:
return outlen;
}
static int do_i2b_bio(BIO *out, const EVP_PKEY *pk, int ispub)
{
unsigned char *tmp = NULL;
int outlen, wrlen;
outlen = do_i2b(&tmp, pk, ispub);
if (outlen < 0)
return -1;
wrlen = BIO_write(out, tmp, outlen);
OPENSSL_free(tmp);
if (wrlen == outlen)
return outlen;
return -1;
}
static int check_bitlen_rsa(const RSA *rsa, int ispub, unsigned int *pmagic)
{
int nbyte, hnbyte, bitlen;
const BIGNUM *e;
RSA_get0_key(rsa, NULL, &e, NULL);
if (BN_num_bits(e) > 32)
goto badkey;
bitlen = RSA_bits(rsa);
nbyte = RSA_size(rsa);
hnbyte = (bitlen + 15) >> 4;
if (ispub) {
*pmagic = MS_RSA1MAGIC;
return bitlen;
} else {
const BIGNUM *d, *p, *q, *iqmp, *dmp1, *dmq1;
*pmagic = MS_RSA2MAGIC;
/*
* For private key each component must fit within nbyte or hnbyte.
*/
RSA_get0_key(rsa, NULL, NULL, &d);
if (BN_num_bytes(d) > nbyte)
goto badkey;
RSA_get0_factors(rsa, &p, &q);
RSA_get0_crt_params(rsa, &dmp1, &dmq1, &iqmp);
if ((BN_num_bytes(iqmp) > hnbyte)
|| (BN_num_bytes(p) > hnbyte)
|| (BN_num_bytes(q) > hnbyte)
|| (BN_num_bytes(dmp1) > hnbyte)
|| (BN_num_bytes(dmq1) > hnbyte))
goto badkey;
}
return bitlen;
badkey:
ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
return 0;
}
static void write_rsa(unsigned char **out, const RSA *rsa, int ispub)
{
int nbyte, hnbyte;
const BIGNUM *n, *d, *e, *p, *q, *iqmp, *dmp1, *dmq1;
nbyte = RSA_size(rsa);
hnbyte = (RSA_bits(rsa) + 15) >> 4;
RSA_get0_key(rsa, &n, &e, &d);
write_lebn(out, e, 4);
write_lebn(out, n, nbyte);
if (ispub)
return;
RSA_get0_factors(rsa, &p, &q);
RSA_get0_crt_params(rsa, &dmp1, &dmq1, &iqmp);
write_lebn(out, p, hnbyte);
write_lebn(out, q, hnbyte);
write_lebn(out, dmp1, hnbyte);
write_lebn(out, dmq1, hnbyte);
write_lebn(out, iqmp, hnbyte);
write_lebn(out, d, nbyte);
}
#ifndef OPENSSL_NO_DSA
static int check_bitlen_dsa(const DSA *dsa, int ispub, unsigned int *pmagic)
{
int bitlen;
const BIGNUM *p = NULL, *q = NULL, *g = NULL;
const BIGNUM *pub_key = NULL, *priv_key = NULL;
DSA_get0_pqg(dsa, &p, &q, &g);
DSA_get0_key(dsa, &pub_key, &priv_key);
bitlen = BN_num_bits(p);
if ((bitlen & 7) || (BN_num_bits(q) != 160)
|| (BN_num_bits(g) > bitlen))
goto badkey;
if (ispub) {
if (BN_num_bits(pub_key) > bitlen)
goto badkey;
*pmagic = MS_DSS1MAGIC;
} else {
if (BN_num_bits(priv_key) > 160)
goto badkey;
*pmagic = MS_DSS2MAGIC;
}
return bitlen;
badkey:
ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_KEY_COMPONENTS);
return 0;
}
static void write_dsa(unsigned char **out, const DSA *dsa, int ispub)
{
int nbyte;
const BIGNUM *p = NULL, *q = NULL, *g = NULL;
const BIGNUM *pub_key = NULL, *priv_key = NULL;
DSA_get0_pqg(dsa, &p, &q, &g);
DSA_get0_key(dsa, &pub_key, &priv_key);
nbyte = BN_num_bytes(p);
write_lebn(out, p, nbyte);
write_lebn(out, q, 20);
write_lebn(out, g, nbyte);
if (ispub)
write_lebn(out, pub_key, nbyte);
else
write_lebn(out, priv_key, 20);
/* Set "invalid" for seed structure values */
memset(*out, 0xff, 24);
*out += 24;
return;
}
#endif
int i2b_PrivateKey_bio(BIO *out, const EVP_PKEY *pk)
{
return do_i2b_bio(out, pk, 0);
}
int i2b_PublicKey_bio(BIO *out, const EVP_PKEY *pk)
{
return do_i2b_bio(out, pk, 1);
}
int ossl_do_PVK_header(const unsigned char **in, unsigned int length,
int skip_magic,
unsigned int *psaltlen, unsigned int *pkeylen)
{
const unsigned char *p = *in;
unsigned int pvk_magic, is_encrypted;
if (skip_magic) {
if (length < 20) {
ERR_raise(ERR_LIB_PEM, PEM_R_PVK_TOO_SHORT);
return 0;
}
} else {
if (length < 24) {
ERR_raise(ERR_LIB_PEM, PEM_R_PVK_TOO_SHORT);
return 0;
}
pvk_magic = read_ledword(&p);
if (pvk_magic != MS_PVKMAGIC) {
ERR_raise(ERR_LIB_PEM, PEM_R_BAD_MAGIC_NUMBER);
return 0;
}
}
/* Skip reserved */
p += 4;
/*
* keytype =
*/ read_ledword(&p);
is_encrypted = read_ledword(&p);
*psaltlen = read_ledword(&p);
*pkeylen = read_ledword(&p);
if (*pkeylen > PVK_MAX_KEYLEN || *psaltlen > PVK_MAX_SALTLEN)
return 0;
if (is_encrypted && *psaltlen == 0) {
ERR_raise(ERR_LIB_PEM, PEM_R_INCONSISTENT_HEADER);
return 0;
}
*in = p;
return 1;
}
#ifndef OPENSSL_NO_RC4
static int derive_pvk_key(unsigned char *key, size_t keylen,
const unsigned char *salt, unsigned int saltlen,
const unsigned char *pass, int passlen,
OSSL_LIB_CTX *libctx, const char *propq)
{
EVP_KDF *kdf;
EVP_KDF_CTX *ctx;
OSSL_PARAM params[5], *p = params;
int rv;
if ((kdf = EVP_KDF_fetch(libctx, "PVKKDF", propq)) == NULL)
return 0;
ctx = EVP_KDF_CTX_new(kdf);
EVP_KDF_free(kdf);
if (ctx == NULL)
return 0;
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_SALT,
(void *)salt, saltlen);
*p++ = OSSL_PARAM_construct_octet_string(OSSL_KDF_PARAM_PASSWORD,
(void *)pass, passlen);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_DIGEST, SN_sha1, 0);
*p++ = OSSL_PARAM_construct_utf8_string(OSSL_KDF_PARAM_PROPERTIES,
(char *)propq, 0);
*p = OSSL_PARAM_construct_end();
rv = EVP_KDF_derive(ctx, key, keylen, params);
EVP_KDF_CTX_free(ctx);
return rv;
}
#endif
static void *do_PVK_body_key(const unsigned char **in,
unsigned int saltlen, unsigned int keylen,
pem_password_cb *cb, void *u,
int *isdss, int *ispub,
OSSL_LIB_CTX *libctx, const char *propq)
{
const unsigned char *p = *in;
unsigned char *enctmp = NULL;
unsigned char keybuf[20];
void *key = NULL;
#ifndef OPENSSL_NO_RC4
EVP_CIPHER *rc4 = NULL;
#endif
EVP_CIPHER_CTX *cctx = EVP_CIPHER_CTX_new();
if (cctx == NULL) {
ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
goto err;
}
if (saltlen) {
#ifndef OPENSSL_NO_RC4
unsigned int magic;
char psbuf[PEM_BUFSIZE];
int enctmplen, inlen;
unsigned char *q;
if (cb)
inlen = cb(psbuf, PEM_BUFSIZE, 0, u);
else
inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 0, u);
if (inlen < 0) {
ERR_raise(ERR_LIB_PEM, PEM_R_BAD_PASSWORD_READ);
goto err;
}
enctmp = OPENSSL_malloc(keylen + 8);
if (enctmp == NULL) {
ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
goto err;
}
if (!derive_pvk_key(keybuf, sizeof(keybuf), p, saltlen,
(unsigned char *)psbuf, inlen, libctx, propq))
goto err;
p += saltlen;
/* Copy BLOBHEADER across, decrypt rest */
memcpy(enctmp, p, 8);
p += 8;
if (keylen < 8) {
ERR_raise(ERR_LIB_PEM, PEM_R_PVK_TOO_SHORT);
goto err;
}
inlen = keylen - 8;
q = enctmp + 8;
if ((rc4 = EVP_CIPHER_fetch(libctx, "RC4", propq)) == NULL)
goto err;
if (!EVP_DecryptInit_ex(cctx, rc4, NULL, keybuf, NULL))
goto err;
if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
goto err;
if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen))
goto err;
magic = read_ledword((const unsigned char **)&q);
if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) {
q = enctmp + 8;
memset(keybuf + 5, 0, 11);
if (!EVP_DecryptInit_ex(cctx, rc4, NULL, keybuf, NULL))
goto err;
if (!EVP_DecryptUpdate(cctx, q, &enctmplen, p, inlen))
goto err;
if (!EVP_DecryptFinal_ex(cctx, q + enctmplen, &enctmplen))
goto err;
magic = read_ledword((const unsigned char **)&q);
if (magic != MS_RSA2MAGIC && magic != MS_DSS2MAGIC) {
ERR_raise(ERR_LIB_PEM, PEM_R_BAD_DECRYPT);
goto err;
}
}
p = enctmp;
#else
ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_CIPHER);
goto err;
#endif
}
key = do_b2i_key(&p, keylen, isdss, ispub);
err:
EVP_CIPHER_CTX_free(cctx);
#ifndef OPENSSL_NO_RC4
EVP_CIPHER_free(rc4);
#endif
if (enctmp != NULL) {
OPENSSL_cleanse(keybuf, sizeof(keybuf));
OPENSSL_free(enctmp);
}
return key;
}
static void *do_PVK_key_bio(BIO *in, pem_password_cb *cb, void *u,
int *isdss, int *ispub,
OSSL_LIB_CTX *libctx, const char *propq)
{
unsigned char pvk_hdr[24], *buf = NULL;
const unsigned char *p;
int buflen;
void *key = NULL;
unsigned int saltlen, keylen;
if (BIO_read(in, pvk_hdr, 24) != 24) {
ERR_raise(ERR_LIB_PEM, PEM_R_PVK_DATA_TOO_SHORT);
return NULL;
}
p = pvk_hdr;
if (!ossl_do_PVK_header(&p, 24, 0, &saltlen, &keylen))
return 0;
buflen = (int)keylen + saltlen;
buf = OPENSSL_malloc(buflen);
if (buf == NULL) {
ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
return 0;
}
p = buf;
if (BIO_read(in, buf, buflen) != buflen) {
ERR_raise(ERR_LIB_PEM, PEM_R_PVK_DATA_TOO_SHORT);
goto err;
}
key = do_PVK_body_key(&p, saltlen, keylen, cb, u, isdss, ispub, libctx, propq);
err:
OPENSSL_clear_free(buf, buflen);
return key;
}
#ifndef OPENSSL_NO_DSA
DSA *b2i_DSA_PVK_bio_ex(BIO *in, pem_password_cb *cb, void *u,
OSSL_LIB_CTX *libctx, const char *propq)
{
int isdss = 1;
int ispub = 0; /* PVK keys are always private */
return do_PVK_key_bio(in, cb, u, &isdss, &ispub, libctx, propq);
}
DSA *b2i_DSA_PVK_bio(BIO *in, pem_password_cb *cb, void *u)
{
return b2i_DSA_PVK_bio_ex(in, cb, u, NULL, NULL);
}
#endif
RSA *b2i_RSA_PVK_bio_ex(BIO *in, pem_password_cb *cb, void *u,
OSSL_LIB_CTX *libctx, const char *propq)
{
int isdss = 0;
int ispub = 0; /* PVK keys are always private */
return do_PVK_key_bio(in, cb, u, &isdss, &ispub, libctx, propq);
}
RSA *b2i_RSA_PVK_bio(BIO *in, pem_password_cb *cb, void *u)
{
return b2i_RSA_PVK_bio_ex(in, cb, u, NULL, NULL);
}
EVP_PKEY *b2i_PVK_bio_ex(BIO *in, pem_password_cb *cb, void *u,
OSSL_LIB_CTX *libctx, const char *propq)
{
int isdss = -1;
int ispub = -1;
void *key = do_PVK_key_bio(in, cb, u, &isdss, &ispub, NULL, NULL);
return evp_pkey_new0_key(key, isdss_to_evp_type(isdss));
}
EVP_PKEY *b2i_PVK_bio(BIO *in, pem_password_cb *cb, void *u)
{
return b2i_PVK_bio_ex(in, cb, u, NULL, NULL);
}
static int i2b_PVK(unsigned char **out, const EVP_PKEY *pk, int enclevel,
pem_password_cb *cb, void *u, OSSL_LIB_CTX *libctx,
const char *propq)
{
int ret = -1;
int outlen = 24, pklen;
unsigned char *p = NULL, *start = NULL;
EVP_CIPHER_CTX *cctx = NULL;
#ifndef OPENSSL_NO_RC4
unsigned char *salt = NULL;
EVP_CIPHER *rc4 = NULL;
#endif
if (enclevel)
outlen += PVK_SALTLEN;
pklen = do_i2b(NULL, pk, 0);
if (pklen < 0)
return -1;
outlen += pklen;
if (out == NULL)
return outlen;
if (*out != NULL) {
p = *out;
} else {
start = p = OPENSSL_malloc(outlen);
if (p == NULL) {
ERR_raise(ERR_LIB_PEM, ERR_R_MALLOC_FAILURE);
return -1;
}
}
cctx = EVP_CIPHER_CTX_new();
if (cctx == NULL)
goto error;
write_ledword(&p, MS_PVKMAGIC);
write_ledword(&p, 0);
if (EVP_PKEY_get_id(pk) == EVP_PKEY_RSA)
write_ledword(&p, MS_KEYTYPE_KEYX);
#ifndef OPENSSL_NO_DSA
else
write_ledword(&p, MS_KEYTYPE_SIGN);
#endif
write_ledword(&p, enclevel ? 1 : 0);
write_ledword(&p, enclevel ? PVK_SALTLEN : 0);
write_ledword(&p, pklen);
if (enclevel) {
#ifndef OPENSSL_NO_RC4
if (RAND_bytes_ex(libctx, p, PVK_SALTLEN, 0) <= 0)
goto error;
salt = p;
p += PVK_SALTLEN;
#endif
}
do_i2b(&p, pk, 0);
if (enclevel != 0) {
#ifndef OPENSSL_NO_RC4
char psbuf[PEM_BUFSIZE];
unsigned char keybuf[20];
int enctmplen, inlen;
if (cb)
inlen = cb(psbuf, PEM_BUFSIZE, 1, u);
else
inlen = PEM_def_callback(psbuf, PEM_BUFSIZE, 1, u);
if (inlen <= 0) {
ERR_raise(ERR_LIB_PEM, PEM_R_BAD_PASSWORD_READ);
goto error;
}
if (!derive_pvk_key(keybuf, sizeof(keybuf), salt, PVK_SALTLEN,
(unsigned char *)psbuf, inlen, libctx, propq))
goto error;
if ((rc4 = EVP_CIPHER_fetch(libctx, "RC4", propq)) == NULL)
goto error;
if (enclevel == 1)
memset(keybuf + 5, 0, 11);
p = salt + PVK_SALTLEN + 8;
if (!EVP_EncryptInit_ex(cctx, rc4, NULL, keybuf, NULL))
goto error;
OPENSSL_cleanse(keybuf, 20);
if (!EVP_EncryptUpdate(cctx, p, &enctmplen, p, pklen - 8))
goto error;
if (!EVP_EncryptFinal_ex(cctx, p + enctmplen, &enctmplen))
goto error;
#else
ERR_raise(ERR_LIB_PEM, PEM_R_UNSUPPORTED_CIPHER);
goto error;
#endif
}
if (*out == NULL)
*out = start;
ret = outlen;
error:
EVP_CIPHER_CTX_free(cctx);
#ifndef OPENSSL_NO_RC4
EVP_CIPHER_free(rc4);
#endif
if (*out == NULL)
OPENSSL_free(start);
return ret;
}
int i2b_PVK_bio_ex(BIO *out, const EVP_PKEY *pk, int enclevel,
pem_password_cb *cb, void *u, OSSL_LIB_CTX *libctx,
const char *propq)
{
unsigned char *tmp = NULL;
int outlen, wrlen;
outlen = i2b_PVK(&tmp, pk, enclevel, cb, u, libctx, propq);
if (outlen < 0)
return -1;
wrlen = BIO_write(out, tmp, outlen);
OPENSSL_free(tmp);
if (wrlen == outlen) {
return outlen;
}
ERR_raise(ERR_LIB_PEM, PEM_R_BIO_WRITE_FAILURE);
return -1;
}
int i2b_PVK_bio(BIO *out, const EVP_PKEY *pk, int enclevel,
pem_password_cb *cb, void *u)
{
return i2b_PVK_bio_ex(out, pk, enclevel, cb, u, NULL, NULL);
}
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