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Perform bounds checks in hmac_signctx.

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Match the other EVP_DigestSignFinal implementations. Fix the instances in
ssl/t1_enc.c which were not following the EVP_DigestSignFinal contract; on
entry, *out_len should contain the size of the buffer.

Change-Id: Icd44d97a4c98704dea975798c0101d5a37274d17
Reviewed-on: https://boringssl-review.googlesource.com/1130
Reviewed-by: Adam Langley <agl@google.com>
This commit is contained in:
David Benjamin 2014-07-10 12:04:11 -04:00 committed by Adam Langley
parent 09020c2f08
commit 7bf334a9ff
4 changed files with 12 additions and 5 deletions
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1
crypto/evp/evp.h
View File

@ -792,6 +792,7 @@ struct evp_pkey_st {
#define EVP_F_EVP_PKEY_get1_DSA 151
#define EVP_F_pkey_rsa_encrypt 152
#define EVP_F_pkey_rsa_decrypt 153
#define EVP_F_hmac_signctx 154
#define EVP_R_UNSUPPORTED_PUBLIC_KEY_TYPE 100
#define EVP_R_UNSUPPORTED_SIGNATURE_TYPE 101
#define EVP_R_INVALID_DIGEST_TYPE 102

1
crypto/evp/evp_error.c
View File

@ -52,6 +52,7 @@ const ERR_STRING_DATA EVP_error_string_data[] = {
{ERR_PACK(ERR_LIB_EVP, EVP_F_eckey_pub_encode, 0), "eckey_pub_encode"},
{ERR_PACK(ERR_LIB_EVP, EVP_F_eckey_type2param, 0), "eckey_type2param"},
{ERR_PACK(ERR_LIB_EVP, EVP_F_evp_pkey_ctx_new, 0), "evp_pkey_ctx_new"},
{ERR_PACK(ERR_LIB_EVP, EVP_F_hmac_signctx, 0), "hmac_signctx"},
{ERR_PACK(ERR_LIB_EVP, EVP_F_i2d_PublicKey, 0), "i2d_PublicKey"},
{ERR_PACK(ERR_LIB_EVP, EVP_F_old_ec_priv_decode, 0), "old_ec_priv_decode"},
{ERR_PACK(ERR_LIB_EVP, EVP_F_old_rsa_priv_decode, 0), "old_rsa_priv_decode"},

11
crypto/evp/p_hmac.c
View File

@ -56,6 +56,7 @@
#include <openssl/evp.h>
#include <openssl/asn1.h>
#include <openssl/err.h>
#include <openssl/hmac.h>
#include <openssl/mem.h>
#include <openssl/obj.h>
@ -153,14 +154,14 @@ static int hmac_signctx(EVP_PKEY_CTX *ctx, unsigned char *sig, size_t *siglen,
EVP_MD_CTX *mctx) {
unsigned int hlen;
HMAC_PKEY_CTX *hctx = ctx->data;
int l = EVP_MD_CTX_size(mctx);
size_t md_size = EVP_MD_CTX_size(mctx);
if (l < 0) {
return 0;
}
*siglen = l;
if (!sig) {
*siglen = md_size;
return 1;
} else if (*siglen < md_size) {
OPENSSL_PUT_ERROR(EVP, hmac_signctx, EVP_R_BUFFER_TOO_SMALL);
return 0;
}
if (!HMAC_Final(&hctx->ctx, sig, &hlen)) {

4
ssl/t1_enc.c
View File

@ -186,6 +186,7 @@ static int tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
goto err;
if (seed5 && !EVP_DigestSignUpdate(&ctx,seed5,seed5_len))
goto err;
A1_len = EVP_MAX_MD_SIZE;
if (!EVP_DigestSignFinal(&ctx,A1,&A1_len))
goto err;
@ -211,16 +212,19 @@ static int tls1_P_hash(const EVP_MD *md, const unsigned char *sec,
if (olen > chunk)
{
j = olen;
if (!EVP_DigestSignFinal(&ctx,out,&j))
goto err;
out+=j;
olen-=j;
/* calc the next A1 value */
A1_len = EVP_MAX_MD_SIZE;
if (!EVP_DigestSignFinal(&ctx_tmp,A1,&A1_len))
goto err;
}
else /* last one */
{
A1_len = EVP_MAX_MD_SIZE;
if (!EVP_DigestSignFinal(&ctx,A1,&A1_len))
goto err;
memcpy(out,A1,olen);