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openssl/crypto/rsa/rsa_ameth.c
Matt Caswell 7467c87c6e Ensure RSA PSS correctly returns the right default digest 
A default digest of SHA256 was being returned for RSA PSS even if the
PSS parameters indicated a different digest must be used. We change this
so that the correct default digest is returned and additionally mark this
as mandatory for PSS.

This bug had an impact on sig alg selection in libssl. Due to this issue
an incorrect sig alg might be selected in the event that a server is
configured with an RSA-PSS cert with parameter restrictions.

Fixes #9545

Reviewed-by: Paul Dale <paul.dale@oracle.com>
(Merged from https://github.com/openssl/openssl/pull/9553)

(cherry picked from commit 9bcc9f973b)
2019-08-09 13:24:14 +01:00

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/*
* Copyright 2006-2019 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the OpenSSL license (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
*/
#include <stdio.h>
#include "internal/cryptlib.h"
#include <openssl/asn1t.h>
#include <openssl/x509.h>
#include <openssl/bn.h>
#include <openssl/cms.h>
#include "internal/asn1_int.h"
#include "internal/evp_int.h"
#include "rsa_locl.h"
#ifndef OPENSSL_NO_CMS
static int rsa_cms_sign(CMS_SignerInfo *si);
static int rsa_cms_verify(CMS_SignerInfo *si);
static int rsa_cms_decrypt(CMS_RecipientInfo *ri);
static int rsa_cms_encrypt(CMS_RecipientInfo *ri);
#endif
static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg);
/* Set any parameters associated with pkey */
static int rsa_param_encode(const EVP_PKEY *pkey,
ASN1_STRING **pstr, int *pstrtype)
{
const RSA *rsa = pkey->pkey.rsa;
*pstr = NULL;
/* If RSA it's just NULL type */
if (pkey->ameth->pkey_id != EVP_PKEY_RSA_PSS) {
*pstrtype = V_ASN1_NULL;
return 1;
}
/* If no PSS parameters we omit parameters entirely */
if (rsa->pss == NULL) {
*pstrtype = V_ASN1_UNDEF;
return 1;
}
/* Encode PSS parameters */
if (ASN1_item_pack(rsa->pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), pstr) == NULL)
return 0;
*pstrtype = V_ASN1_SEQUENCE;
return 1;
}
/* Decode any parameters and set them in RSA structure */
static int rsa_param_decode(RSA *rsa, const X509_ALGOR *alg)
{
const ASN1_OBJECT *algoid;
const void *algp;
int algptype;
X509_ALGOR_get0(&algoid, &algptype, &algp, alg);
if (OBJ_obj2nid(algoid) != EVP_PKEY_RSA_PSS)
return 1;
if (algptype == V_ASN1_UNDEF)
return 1;
if (algptype != V_ASN1_SEQUENCE) {
RSAerr(RSA_F_RSA_PARAM_DECODE, RSA_R_INVALID_PSS_PARAMETERS);
return 0;
}
rsa->pss = rsa_pss_decode(alg);
if (rsa->pss == NULL)
return 0;
return 1;
}
static int rsa_pub_encode(X509_PUBKEY *pk, const EVP_PKEY *pkey)
{
unsigned char *penc = NULL;
int penclen;
ASN1_STRING *str;
int strtype;
if (!rsa_param_encode(pkey, &str, &strtype))
return 0;
penclen = i2d_RSAPublicKey(pkey->pkey.rsa, &penc);
if (penclen <= 0)
return 0;
if (X509_PUBKEY_set0_param(pk, OBJ_nid2obj(pkey->ameth->pkey_id),
strtype, str, penc, penclen))
return 1;
OPENSSL_free(penc);
return 0;
}
static int rsa_pub_decode(EVP_PKEY *pkey, X509_PUBKEY *pubkey)
{
const unsigned char *p;
int pklen;
X509_ALGOR *alg;
RSA *rsa = NULL;
if (!X509_PUBKEY_get0_param(NULL, &p, &pklen, &alg, pubkey))
return 0;
if ((rsa = d2i_RSAPublicKey(NULL, &p, pklen)) == NULL) {
RSAerr(RSA_F_RSA_PUB_DECODE, ERR_R_RSA_LIB);
return 0;
}
if (!rsa_param_decode(rsa, alg)) {
RSA_free(rsa);
return 0;
}
if (!EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa)) {
RSA_free(rsa);
return 0;
}
return 1;
}
static int rsa_pub_cmp(const EVP_PKEY *a, const EVP_PKEY *b)
{
if (BN_cmp(b->pkey.rsa->n, a->pkey.rsa->n) != 0
|| BN_cmp(b->pkey.rsa->e, a->pkey.rsa->e) != 0)
return 0;
return 1;
}
static int old_rsa_priv_decode(EVP_PKEY *pkey,
const unsigned char **pder, int derlen)
{
RSA *rsa;
if ((rsa = d2i_RSAPrivateKey(NULL, pder, derlen)) == NULL) {
RSAerr(RSA_F_OLD_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
return 0;
}
EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa);
return 1;
}
static int old_rsa_priv_encode(const EVP_PKEY *pkey, unsigned char **pder)
{
return i2d_RSAPrivateKey(pkey->pkey.rsa, pder);
}
static int rsa_priv_encode(PKCS8_PRIV_KEY_INFO *p8, const EVP_PKEY *pkey)
{
unsigned char *rk = NULL;
int rklen;
ASN1_STRING *str;
int strtype;
if (!rsa_param_encode(pkey, &str, &strtype))
return 0;
rklen = i2d_RSAPrivateKey(pkey->pkey.rsa, &rk);
if (rklen <= 0) {
RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
ASN1_STRING_free(str);
return 0;
}
if (!PKCS8_pkey_set0(p8, OBJ_nid2obj(pkey->ameth->pkey_id), 0,
strtype, str, rk, rklen)) {
RSAerr(RSA_F_RSA_PRIV_ENCODE, ERR_R_MALLOC_FAILURE);
ASN1_STRING_free(str);
return 0;
}
return 1;
}
static int rsa_priv_decode(EVP_PKEY *pkey, const PKCS8_PRIV_KEY_INFO *p8)
{
const unsigned char *p;
RSA *rsa;
int pklen;
const X509_ALGOR *alg;
if (!PKCS8_pkey_get0(NULL, &p, &pklen, &alg, p8))
return 0;
rsa = d2i_RSAPrivateKey(NULL, &p, pklen);
if (rsa == NULL) {
RSAerr(RSA_F_RSA_PRIV_DECODE, ERR_R_RSA_LIB);
return 0;
}
if (!rsa_param_decode(rsa, alg)) {
RSA_free(rsa);
return 0;
}
EVP_PKEY_assign(pkey, pkey->ameth->pkey_id, rsa);
return 1;
}
static int int_rsa_size(const EVP_PKEY *pkey)
{
return RSA_size(pkey->pkey.rsa);
}
static int rsa_bits(const EVP_PKEY *pkey)
{
return BN_num_bits(pkey->pkey.rsa->n);
}
static int rsa_security_bits(const EVP_PKEY *pkey)
{
return RSA_security_bits(pkey->pkey.rsa);
}
static void int_rsa_free(EVP_PKEY *pkey)
{
RSA_free(pkey->pkey.rsa);
}
static X509_ALGOR *rsa_mgf1_decode(X509_ALGOR *alg)
{
if (OBJ_obj2nid(alg->algorithm) != NID_mgf1)
return NULL;
return ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(X509_ALGOR),
alg->parameter);
}
static int rsa_pss_param_print(BIO *bp, int pss_key, RSA_PSS_PARAMS *pss,
int indent)
{
int rv = 0;
X509_ALGOR *maskHash = NULL;
if (!BIO_indent(bp, indent, 128))
goto err;
if (pss_key) {
if (pss == NULL) {
if (BIO_puts(bp, "No PSS parameter restrictions\n") <= 0)
return 0;
return 1;
} else {
if (BIO_puts(bp, "PSS parameter restrictions:") <= 0)
return 0;
}
} else if (pss == NULL) {
if (BIO_puts(bp,"(INVALID PSS PARAMETERS)\n") <= 0)
return 0;
return 1;
}
if (BIO_puts(bp, "\n") <= 0)
goto err;
if (pss_key)
indent += 2;
if (!BIO_indent(bp, indent, 128))
goto err;
if (BIO_puts(bp, "Hash Algorithm: ") <= 0)
goto err;
if (pss->hashAlgorithm) {
if (i2a_ASN1_OBJECT(bp, pss->hashAlgorithm->algorithm) <= 0)
goto err;
} else if (BIO_puts(bp, "sha1 (default)") <= 0) {
goto err;
}
if (BIO_puts(bp, "\n") <= 0)
goto err;
if (!BIO_indent(bp, indent, 128))
goto err;
if (BIO_puts(bp, "Mask Algorithm: ") <= 0)
goto err;
if (pss->maskGenAlgorithm) {
if (i2a_ASN1_OBJECT(bp, pss->maskGenAlgorithm->algorithm) <= 0)
goto err;
if (BIO_puts(bp, " with ") <= 0)
goto err;
maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
if (maskHash != NULL) {
if (i2a_ASN1_OBJECT(bp, maskHash->algorithm) <= 0)
goto err;
} else if (BIO_puts(bp, "INVALID") <= 0) {
goto err;
}
} else if (BIO_puts(bp, "mgf1 with sha1 (default)") <= 0) {
goto err;
}
BIO_puts(bp, "\n");
if (!BIO_indent(bp, indent, 128))
goto err;
if (BIO_printf(bp, "%s Salt Length: 0x", pss_key ? "Minimum" : "") <= 0)
goto err;
if (pss->saltLength) {
if (i2a_ASN1_INTEGER(bp, pss->saltLength) <= 0)
goto err;
} else if (BIO_puts(bp, "14 (default)") <= 0) {
goto err;
}
BIO_puts(bp, "\n");
if (!BIO_indent(bp, indent, 128))
goto err;
if (BIO_puts(bp, "Trailer Field: 0x") <= 0)
goto err;
if (pss->trailerField) {
if (i2a_ASN1_INTEGER(bp, pss->trailerField) <= 0)
goto err;
} else if (BIO_puts(bp, "BC (default)") <= 0) {
goto err;
}
BIO_puts(bp, "\n");
rv = 1;
err:
X509_ALGOR_free(maskHash);
return rv;
}
static int pkey_rsa_print(BIO *bp, const EVP_PKEY *pkey, int off, int priv)
{
const RSA *x = pkey->pkey.rsa;
char *str;
const char *s;
int ret = 0, mod_len = 0, ex_primes;
if (x->n != NULL)
mod_len = BN_num_bits(x->n);
ex_primes = sk_RSA_PRIME_INFO_num(x->prime_infos);
if (!BIO_indent(bp, off, 128))
goto err;
if (BIO_printf(bp, "%s ", pkey_is_pss(pkey) ? "RSA-PSS" : "RSA") <= 0)
goto err;
if (priv && x->d) {
if (BIO_printf(bp, "Private-Key: (%d bit, %d primes)\n",
mod_len, ex_primes <= 0 ? 2 : ex_primes + 2) <= 0)
goto err;
str = "modulus:";
s = "publicExponent:";
} else {
if (BIO_printf(bp, "Public-Key: (%d bit)\n", mod_len) <= 0)
goto err;
str = "Modulus:";
s = "Exponent:";
}
if (!ASN1_bn_print(bp, str, x->n, NULL, off))
goto err;
if (!ASN1_bn_print(bp, s, x->e, NULL, off))
goto err;
if (priv) {
int i;
if (!ASN1_bn_print(bp, "privateExponent:", x->d, NULL, off))
goto err;
if (!ASN1_bn_print(bp, "prime1:", x->p, NULL, off))
goto err;
if (!ASN1_bn_print(bp, "prime2:", x->q, NULL, off))
goto err;
if (!ASN1_bn_print(bp, "exponent1:", x->dmp1, NULL, off))
goto err;
if (!ASN1_bn_print(bp, "exponent2:", x->dmq1, NULL, off))
goto err;
if (!ASN1_bn_print(bp, "coefficient:", x->iqmp, NULL, off))
goto err;
for (i = 0; i < sk_RSA_PRIME_INFO_num(x->prime_infos); i++) {
/* print multi-prime info */
BIGNUM *bn = NULL;
RSA_PRIME_INFO *pinfo;
int j;
pinfo = sk_RSA_PRIME_INFO_value(x->prime_infos, i);
for (j = 0; j < 3; j++) {
if (!BIO_indent(bp, off, 128))
goto err;
switch (j) {
case 0:
if (BIO_printf(bp, "prime%d:", i + 3) <= 0)
goto err;
bn = pinfo->r;
break;
case 1:
if (BIO_printf(bp, "exponent%d:", i + 3) <= 0)
goto err;
bn = pinfo->d;
break;
case 2:
if (BIO_printf(bp, "coefficient%d:", i + 3) <= 0)
goto err;
bn = pinfo->t;
break;
default:
break;
}
if (!ASN1_bn_print(bp, "", bn, NULL, off))
goto err;
}
}
}
if (pkey_is_pss(pkey) && !rsa_pss_param_print(bp, 1, x->pss, off))
goto err;
ret = 1;
err:
return ret;
}
static int rsa_pub_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx)
{
return pkey_rsa_print(bp, pkey, indent, 0);
}
static int rsa_priv_print(BIO *bp, const EVP_PKEY *pkey, int indent,
ASN1_PCTX *ctx)
{
return pkey_rsa_print(bp, pkey, indent, 1);
}
static RSA_PSS_PARAMS *rsa_pss_decode(const X509_ALGOR *alg)
{
RSA_PSS_PARAMS *pss;
pss = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_PSS_PARAMS),
alg->parameter);
if (pss == NULL)
return NULL;
if (pss->maskGenAlgorithm != NULL) {
pss->maskHash = rsa_mgf1_decode(pss->maskGenAlgorithm);
if (pss->maskHash == NULL) {
RSA_PSS_PARAMS_free(pss);
return NULL;
}
}
return pss;
}
static int rsa_sig_print(BIO *bp, const X509_ALGOR *sigalg,
const ASN1_STRING *sig, int indent, ASN1_PCTX *pctx)
{
if (OBJ_obj2nid(sigalg->algorithm) == EVP_PKEY_RSA_PSS) {
int rv;
RSA_PSS_PARAMS *pss = rsa_pss_decode(sigalg);
rv = rsa_pss_param_print(bp, 0, pss, indent);
RSA_PSS_PARAMS_free(pss);
if (!rv)
return 0;
} else if (!sig && BIO_puts(bp, "\n") <= 0) {
return 0;
}
if (sig)
return X509_signature_dump(bp, sig, indent);
return 1;
}
static int rsa_pkey_ctrl(EVP_PKEY *pkey, int op, long arg1, void *arg2)
{
X509_ALGOR *alg = NULL;
const EVP_MD *md;
const EVP_MD *mgf1md;
int min_saltlen;
switch (op) {
case ASN1_PKEY_CTRL_PKCS7_SIGN:
if (arg1 == 0)
PKCS7_SIGNER_INFO_get0_algs(arg2, NULL, NULL, &alg);
break;
case ASN1_PKEY_CTRL_PKCS7_ENCRYPT:
if (pkey_is_pss(pkey))
return -2;
if (arg1 == 0)
PKCS7_RECIP_INFO_get0_alg(arg2, &alg);
break;
#ifndef OPENSSL_NO_CMS
case ASN1_PKEY_CTRL_CMS_SIGN:
if (arg1 == 0)
return rsa_cms_sign(arg2);
else if (arg1 == 1)
return rsa_cms_verify(arg2);
break;
case ASN1_PKEY_CTRL_CMS_ENVELOPE:
if (pkey_is_pss(pkey))
return -2;
if (arg1 == 0)
return rsa_cms_encrypt(arg2);
else if (arg1 == 1)
return rsa_cms_decrypt(arg2);
break;
case ASN1_PKEY_CTRL_CMS_RI_TYPE:
if (pkey_is_pss(pkey))
return -2;
*(int *)arg2 = CMS_RECIPINFO_TRANS;
return 1;
#endif
case ASN1_PKEY_CTRL_DEFAULT_MD_NID:
if (pkey->pkey.rsa->pss != NULL) {
if (!rsa_pss_get_param(pkey->pkey.rsa->pss, &md, &mgf1md,
&min_saltlen)) {
RSAerr(0, ERR_R_INTERNAL_ERROR);
return 0;
}
*(int *)arg2 = EVP_MD_type(md);
/* Return of 2 indicates this MD is mandatory */
return 2;
}
*(int *)arg2 = NID_sha256;
return 1;
default:
return -2;
}
if (alg)
X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
return 1;
}
/* allocate and set algorithm ID from EVP_MD, default SHA1 */
static int rsa_md_to_algor(X509_ALGOR **palg, const EVP_MD *md)
{
if (md == NULL || EVP_MD_type(md) == NID_sha1)
return 1;
*palg = X509_ALGOR_new();
if (*palg == NULL)
return 0;
X509_ALGOR_set_md(*palg, md);
return 1;
}
/* Allocate and set MGF1 algorithm ID from EVP_MD */
static int rsa_md_to_mgf1(X509_ALGOR **palg, const EVP_MD *mgf1md)
{
X509_ALGOR *algtmp = NULL;
ASN1_STRING *stmp = NULL;
*palg = NULL;
if (mgf1md == NULL || EVP_MD_type(mgf1md) == NID_sha1)
return 1;
/* need to embed algorithm ID inside another */
if (!rsa_md_to_algor(&algtmp, mgf1md))
goto err;
if (ASN1_item_pack(algtmp, ASN1_ITEM_rptr(X509_ALGOR), &stmp) == NULL)
goto err;
*palg = X509_ALGOR_new();
if (*palg == NULL)
goto err;
X509_ALGOR_set0(*palg, OBJ_nid2obj(NID_mgf1), V_ASN1_SEQUENCE, stmp);
stmp = NULL;
err:
ASN1_STRING_free(stmp);
X509_ALGOR_free(algtmp);
if (*palg)
return 1;
return 0;
}
/* convert algorithm ID to EVP_MD, default SHA1 */
static const EVP_MD *rsa_algor_to_md(X509_ALGOR *alg)
{
const EVP_MD *md;
if (!alg)
return EVP_sha1();
md = EVP_get_digestbyobj(alg->algorithm);
if (md == NULL)
RSAerr(RSA_F_RSA_ALGOR_TO_MD, RSA_R_UNKNOWN_DIGEST);
return md;
}
/*
* Convert EVP_PKEY_CTX in PSS mode into corresponding algorithm parameter,
* suitable for setting an AlgorithmIdentifier.
*/
static RSA_PSS_PARAMS *rsa_ctx_to_pss(EVP_PKEY_CTX *pkctx)
{
const EVP_MD *sigmd, *mgf1md;
EVP_PKEY *pk = EVP_PKEY_CTX_get0_pkey(pkctx);
int saltlen;
if (EVP_PKEY_CTX_get_signature_md(pkctx, &sigmd) <= 0)
return NULL;
if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
return NULL;
if (!EVP_PKEY_CTX_get_rsa_pss_saltlen(pkctx, &saltlen))
return NULL;
if (saltlen == -1) {
saltlen = EVP_MD_size(sigmd);
} else if (saltlen == -2 || saltlen == -3) {
saltlen = EVP_PKEY_size(pk) - EVP_MD_size(sigmd) - 2;
if ((EVP_PKEY_bits(pk) & 0x7) == 1)
saltlen--;
if (saltlen < 0)
return NULL;
}
return rsa_pss_params_create(sigmd, mgf1md, saltlen);
}
RSA_PSS_PARAMS *rsa_pss_params_create(const EVP_MD *sigmd,
const EVP_MD *mgf1md, int saltlen)
{
RSA_PSS_PARAMS *pss = RSA_PSS_PARAMS_new();
if (pss == NULL)
goto err;
if (saltlen != 20) {
pss->saltLength = ASN1_INTEGER_new();
if (pss->saltLength == NULL)
goto err;
if (!ASN1_INTEGER_set(pss->saltLength, saltlen))
goto err;
}
if (!rsa_md_to_algor(&pss->hashAlgorithm, sigmd))
goto err;
if (mgf1md == NULL)
mgf1md = sigmd;
if (!rsa_md_to_mgf1(&pss->maskGenAlgorithm, mgf1md))
goto err;
if (!rsa_md_to_algor(&pss->maskHash, mgf1md))
goto err;
return pss;
err:
RSA_PSS_PARAMS_free(pss);
return NULL;
}
static ASN1_STRING *rsa_ctx_to_pss_string(EVP_PKEY_CTX *pkctx)
{
RSA_PSS_PARAMS *pss = rsa_ctx_to_pss(pkctx);
ASN1_STRING *os;
if (pss == NULL)
return NULL;
os = ASN1_item_pack(pss, ASN1_ITEM_rptr(RSA_PSS_PARAMS), NULL);
RSA_PSS_PARAMS_free(pss);
return os;
}
/*
* From PSS AlgorithmIdentifier set public key parameters. If pkey isn't NULL
* then the EVP_MD_CTX is setup and initialised. If it is NULL parameters are
* passed to pkctx instead.
*/
static int rsa_pss_to_ctx(EVP_MD_CTX *ctx, EVP_PKEY_CTX *pkctx,
X509_ALGOR *sigalg, EVP_PKEY *pkey)
{
int rv = -1;
int saltlen;
const EVP_MD *mgf1md = NULL, *md = NULL;
RSA_PSS_PARAMS *pss;
/* Sanity check: make sure it is PSS */
if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
return -1;
}
/* Decode PSS parameters */
pss = rsa_pss_decode(sigalg);
if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen)) {
RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_INVALID_PSS_PARAMETERS);
goto err;
}
/* We have all parameters now set up context */
if (pkey) {
if (!EVP_DigestVerifyInit(ctx, &pkctx, md, NULL, pkey))
goto err;
} else {
const EVP_MD *checkmd;
if (EVP_PKEY_CTX_get_signature_md(pkctx, &checkmd) <= 0)
goto err;
if (EVP_MD_type(md) != EVP_MD_type(checkmd)) {
RSAerr(RSA_F_RSA_PSS_TO_CTX, RSA_R_DIGEST_DOES_NOT_MATCH);
goto err;
}
}
if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_PSS_PADDING) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_pss_saltlen(pkctx, saltlen) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
goto err;
/* Carry on */
rv = 1;
err:
RSA_PSS_PARAMS_free(pss);
return rv;
}
int rsa_pss_get_param(const RSA_PSS_PARAMS *pss, const EVP_MD **pmd,
const EVP_MD **pmgf1md, int *psaltlen)
{
if (pss == NULL)
return 0;
*pmd = rsa_algor_to_md(pss->hashAlgorithm);
if (*pmd == NULL)
return 0;
*pmgf1md = rsa_algor_to_md(pss->maskHash);
if (*pmgf1md == NULL)
return 0;
if (pss->saltLength) {
*psaltlen = ASN1_INTEGER_get(pss->saltLength);
if (*psaltlen < 0) {
RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_SALT_LENGTH);
return 0;
}
} else {
*psaltlen = 20;
}
/*
* low-level routines support only trailer field 0xbc (value 1) and
* PKCS#1 says we should reject any other value anyway.
*/
if (pss->trailerField && ASN1_INTEGER_get(pss->trailerField) != 1) {
RSAerr(RSA_F_RSA_PSS_GET_PARAM, RSA_R_INVALID_TRAILER);
return 0;
}
return 1;
}
#ifndef OPENSSL_NO_CMS
static int rsa_cms_verify(CMS_SignerInfo *si)
{
int nid, nid2;
X509_ALGOR *alg;
EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
nid = OBJ_obj2nid(alg->algorithm);
if (nid == EVP_PKEY_RSA_PSS)
return rsa_pss_to_ctx(NULL, pkctx, alg, NULL);
/* Only PSS allowed for PSS keys */
if (pkey_ctx_is_pss(pkctx)) {
RSAerr(RSA_F_RSA_CMS_VERIFY, RSA_R_ILLEGAL_OR_UNSUPPORTED_PADDING_MODE);
return 0;
}
if (nid == NID_rsaEncryption)
return 1;
/* Workaround for some implementation that use a signature OID */
if (OBJ_find_sigid_algs(nid, NULL, &nid2)) {
if (nid2 == NID_rsaEncryption)
return 1;
}
return 0;
}
#endif
/*
* Customised RSA item verification routine. This is called when a signature
* is encountered requiring special handling. We currently only handle PSS.
*/
static int rsa_item_verify(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
X509_ALGOR *sigalg, ASN1_BIT_STRING *sig,
EVP_PKEY *pkey)
{
/* Sanity check: make sure it is PSS */
if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS) {
RSAerr(RSA_F_RSA_ITEM_VERIFY, RSA_R_UNSUPPORTED_SIGNATURE_TYPE);
return -1;
}
if (rsa_pss_to_ctx(ctx, NULL, sigalg, pkey) > 0) {
/* Carry on */
return 2;
}
return -1;
}
#ifndef OPENSSL_NO_CMS
static int rsa_cms_sign(CMS_SignerInfo *si)
{
int pad_mode = RSA_PKCS1_PADDING;
X509_ALGOR *alg;
EVP_PKEY_CTX *pkctx = CMS_SignerInfo_get0_pkey_ctx(si);
ASN1_STRING *os = NULL;
CMS_SignerInfo_get0_algs(si, NULL, NULL, NULL, &alg);
if (pkctx) {
if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
return 0;
}
if (pad_mode == RSA_PKCS1_PADDING) {
X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
return 1;
}
/* We don't support it */
if (pad_mode != RSA_PKCS1_PSS_PADDING)
return 0;
os = rsa_ctx_to_pss_string(pkctx);
if (!os)
return 0;
X509_ALGOR_set0(alg, OBJ_nid2obj(EVP_PKEY_RSA_PSS), V_ASN1_SEQUENCE, os);
return 1;
}
#endif
static int rsa_item_sign(EVP_MD_CTX *ctx, const ASN1_ITEM *it, void *asn,
X509_ALGOR *alg1, X509_ALGOR *alg2,
ASN1_BIT_STRING *sig)
{
int pad_mode;
EVP_PKEY_CTX *pkctx = EVP_MD_CTX_pkey_ctx(ctx);
if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
return 0;
if (pad_mode == RSA_PKCS1_PADDING)
return 2;
if (pad_mode == RSA_PKCS1_PSS_PADDING) {
ASN1_STRING *os1 = NULL;
os1 = rsa_ctx_to_pss_string(pkctx);
if (!os1)
return 0;
/* Duplicate parameters if we have to */
if (alg2) {
ASN1_STRING *os2 = ASN1_STRING_dup(os1);
if (!os2) {
ASN1_STRING_free(os1);
return 0;
}
X509_ALGOR_set0(alg2, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
V_ASN1_SEQUENCE, os2);
}
X509_ALGOR_set0(alg1, OBJ_nid2obj(EVP_PKEY_RSA_PSS),
V_ASN1_SEQUENCE, os1);
return 3;
}
return 2;
}
static int rsa_sig_info_set(X509_SIG_INFO *siginf, const X509_ALGOR *sigalg,
const ASN1_STRING *sig)
{
int rv = 0;
int mdnid, saltlen;
uint32_t flags;
const EVP_MD *mgf1md = NULL, *md = NULL;
RSA_PSS_PARAMS *pss;
/* Sanity check: make sure it is PSS */
if (OBJ_obj2nid(sigalg->algorithm) != EVP_PKEY_RSA_PSS)
return 0;
/* Decode PSS parameters */
pss = rsa_pss_decode(sigalg);
if (!rsa_pss_get_param(pss, &md, &mgf1md, &saltlen))
goto err;
mdnid = EVP_MD_type(md);
/*
* For TLS need SHA256, SHA384 or SHA512, digest and MGF1 digest must
* match and salt length must equal digest size
*/
if ((mdnid == NID_sha256 || mdnid == NID_sha384 || mdnid == NID_sha512)
&& mdnid == EVP_MD_type(mgf1md) && saltlen == EVP_MD_size(md))
flags = X509_SIG_INFO_TLS;
else
flags = 0;
/* Note: security bits half number of digest bits */
X509_SIG_INFO_set(siginf, mdnid, EVP_PKEY_RSA_PSS, EVP_MD_size(md) * 4,
flags);
rv = 1;
err:
RSA_PSS_PARAMS_free(pss);
return rv;
}
#ifndef OPENSSL_NO_CMS
static RSA_OAEP_PARAMS *rsa_oaep_decode(const X509_ALGOR *alg)
{
RSA_OAEP_PARAMS *oaep;
oaep = ASN1_TYPE_unpack_sequence(ASN1_ITEM_rptr(RSA_OAEP_PARAMS),
alg->parameter);
if (oaep == NULL)
return NULL;
if (oaep->maskGenFunc != NULL) {
oaep->maskHash = rsa_mgf1_decode(oaep->maskGenFunc);
if (oaep->maskHash == NULL) {
RSA_OAEP_PARAMS_free(oaep);
return NULL;
}
}
return oaep;
}
static int rsa_cms_decrypt(CMS_RecipientInfo *ri)
{
EVP_PKEY_CTX *pkctx;
X509_ALGOR *cmsalg;
int nid;
int rv = -1;
unsigned char *label = NULL;
int labellen = 0;
const EVP_MD *mgf1md = NULL, *md = NULL;
RSA_OAEP_PARAMS *oaep;
pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
if (pkctx == NULL)
return 0;
if (!CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &cmsalg))
return -1;
nid = OBJ_obj2nid(cmsalg->algorithm);
if (nid == NID_rsaEncryption)
return 1;
if (nid != NID_rsaesOaep) {
RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_ENCRYPTION_TYPE);
return -1;
}
/* Decode OAEP parameters */
oaep = rsa_oaep_decode(cmsalg);
if (oaep == NULL) {
RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_OAEP_PARAMETERS);
goto err;
}
mgf1md = rsa_algor_to_md(oaep->maskHash);
if (mgf1md == NULL)
goto err;
md = rsa_algor_to_md(oaep->hashFunc);
if (md == NULL)
goto err;
if (oaep->pSourceFunc != NULL) {
X509_ALGOR *plab = oaep->pSourceFunc;
if (OBJ_obj2nid(plab->algorithm) != NID_pSpecified) {
RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_UNSUPPORTED_LABEL_SOURCE);
goto err;
}
if (plab->parameter->type != V_ASN1_OCTET_STRING) {
RSAerr(RSA_F_RSA_CMS_DECRYPT, RSA_R_INVALID_LABEL);
goto err;
}
label = plab->parameter->value.octet_string->data;
/* Stop label being freed when OAEP parameters are freed */
plab->parameter->value.octet_string->data = NULL;
labellen = plab->parameter->value.octet_string->length;
}
if (EVP_PKEY_CTX_set_rsa_padding(pkctx, RSA_PKCS1_OAEP_PADDING) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_oaep_md(pkctx, md) <= 0)
goto err;
if (EVP_PKEY_CTX_set_rsa_mgf1_md(pkctx, mgf1md) <= 0)
goto err;
if (EVP_PKEY_CTX_set0_rsa_oaep_label(pkctx, label, labellen) <= 0)
goto err;
/* Carry on */
rv = 1;
err:
RSA_OAEP_PARAMS_free(oaep);
return rv;
}
static int rsa_cms_encrypt(CMS_RecipientInfo *ri)
{
const EVP_MD *md, *mgf1md;
RSA_OAEP_PARAMS *oaep = NULL;
ASN1_STRING *os = NULL;
X509_ALGOR *alg;
EVP_PKEY_CTX *pkctx = CMS_RecipientInfo_get0_pkey_ctx(ri);
int pad_mode = RSA_PKCS1_PADDING, rv = 0, labellen;
unsigned char *label;
if (CMS_RecipientInfo_ktri_get0_algs(ri, NULL, NULL, &alg) <= 0)
return 0;
if (pkctx) {
if (EVP_PKEY_CTX_get_rsa_padding(pkctx, &pad_mode) <= 0)
return 0;
}
if (pad_mode == RSA_PKCS1_PADDING) {
X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaEncryption), V_ASN1_NULL, 0);
return 1;
}
/* Not supported */
if (pad_mode != RSA_PKCS1_OAEP_PADDING)
return 0;
if (EVP_PKEY_CTX_get_rsa_oaep_md(pkctx, &md) <= 0)
goto err;
if (EVP_PKEY_CTX_get_rsa_mgf1_md(pkctx, &mgf1md) <= 0)
goto err;
labellen = EVP_PKEY_CTX_get0_rsa_oaep_label(pkctx, &label);
if (labellen < 0)
goto err;
oaep = RSA_OAEP_PARAMS_new();
if (oaep == NULL)
goto err;
if (!rsa_md_to_algor(&oaep->hashFunc, md))
goto err;
if (!rsa_md_to_mgf1(&oaep->maskGenFunc, mgf1md))
goto err;
if (labellen > 0) {
ASN1_OCTET_STRING *los;
oaep->pSourceFunc = X509_ALGOR_new();
if (oaep->pSourceFunc == NULL)
goto err;
los = ASN1_OCTET_STRING_new();
if (los == NULL)
goto err;
if (!ASN1_OCTET_STRING_set(los, label, labellen)) {
ASN1_OCTET_STRING_free(los);
goto err;
}
X509_ALGOR_set0(oaep->pSourceFunc, OBJ_nid2obj(NID_pSpecified),
V_ASN1_OCTET_STRING, los);
}
/* create string with pss parameter encoding. */
if (!ASN1_item_pack(oaep, ASN1_ITEM_rptr(RSA_OAEP_PARAMS), &os))
goto err;
X509_ALGOR_set0(alg, OBJ_nid2obj(NID_rsaesOaep), V_ASN1_SEQUENCE, os);
os = NULL;
rv = 1;
err:
RSA_OAEP_PARAMS_free(oaep);
ASN1_STRING_free(os);
return rv;
}
#endif
static int rsa_pkey_check(const EVP_PKEY *pkey)
{
return RSA_check_key_ex(pkey->pkey.rsa, NULL);
}
const EVP_PKEY_ASN1_METHOD rsa_asn1_meths[2] = {
{
EVP_PKEY_RSA,
EVP_PKEY_RSA,
ASN1_PKEY_SIGPARAM_NULL,
"RSA",
"OpenSSL RSA method",
rsa_pub_decode,
rsa_pub_encode,
rsa_pub_cmp,
rsa_pub_print,
rsa_priv_decode,
rsa_priv_encode,
rsa_priv_print,
int_rsa_size,
rsa_bits,
rsa_security_bits,
0, 0, 0, 0, 0, 0,
rsa_sig_print,
int_rsa_free,
rsa_pkey_ctrl,
old_rsa_priv_decode,
old_rsa_priv_encode,
rsa_item_verify,
rsa_item_sign,
rsa_sig_info_set,
rsa_pkey_check
},
{
EVP_PKEY_RSA2,
EVP_PKEY_RSA,
ASN1_PKEY_ALIAS}
};
const EVP_PKEY_ASN1_METHOD rsa_pss_asn1_meth = {
EVP_PKEY_RSA_PSS,
EVP_PKEY_RSA_PSS,
ASN1_PKEY_SIGPARAM_NULL,
"RSA-PSS",
"OpenSSL RSA-PSS method",
rsa_pub_decode,
rsa_pub_encode,
rsa_pub_cmp,
rsa_pub_print,
rsa_priv_decode,
rsa_priv_encode,
rsa_priv_print,
int_rsa_size,
rsa_bits,
rsa_security_bits,
0, 0, 0, 0, 0, 0,
rsa_sig_print,
int_rsa_free,
rsa_pkey_ctrl,
0, 0,
rsa_item_verify,
rsa_item_sign,
0,
rsa_pkey_check
};
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