Commit c8269881 authored by Matt Caswell's avatar Matt Caswell
Browse files

Sanity check EVP_CTRL_AEAD_TLS_AAD 



The various implementations of EVP_CTRL_AEAD_TLS_AAD expect a buffer of at
least 13 bytes long. Add sanity checks to ensure that the length is at
least that. Also add a new constant (EVP_AEAD_TLS1_AAD_LEN) to evp.h to
represent this length. Thanks to Kevin Wojtysiak (Int3 Solutions) and
Paramjot Oberoi (Int3 Solutions) for reporting this issue.

Reviewed-by: default avatarAndy Polyakov <appro@openssl.org>
parent 873fb39f

apps/speed.c

+3 −2
Original line number Diff line number Diff line
@@ -2456,7 +2456,7 @@ static void multiblock_speed(const EVP_CIPHER *evp_cipher) 
        print_message(alg_name, 0, mblengths[j]);

        Time_F(START);

        for (count = 0, run = 1; run && count < 0x7fffffff; count++) {

            unsigned char aad[13];

            unsigned char aad[EVP_AEAD_TLS1_AAD_LEN];

            EVP_CTRL_TLS1_1_MULTIBLOCK_PARAM mb_param;

            size_t len = mblengths[j];

            int packlen;
@@ -2491,7 +2491,8 @@ static void multiblock_speed(const EVP_CIPHER *evp_cipher) 
                aad[11] = len >> 8;

                aad[12] = len;

                pad = EVP_CIPHER_CTX_ctrl(&ctx,

                                          EVP_CTRL_AEAD_TLS1_AAD, 13, aad);

                                          EVP_CTRL_AEAD_TLS1_AAD,

                                          EVP_AEAD_TLS1_AAD_LEN, aad);

                EVP_Cipher(&ctx, out, inp, len + pad);

            }

        }

crypto/evp/e_aes.c

+1 −1
Original line number Diff line number Diff line
@@ -1327,7 +1327,7 @@ static int aes_gcm_ctrl(EVP_CIPHER_CTX *c, int type, int arg, void *ptr) 


    case EVP_CTRL_AEAD_TLS1_AAD:

        /* Save the AAD for later use */

        if (arg != 13)

        if (arg != EVP_AEAD_TLS1_AAD_LEN)

            return 0;

        memcpy(c->buf, ptr, arg);

        gctx->tls_aad_len = arg;

crypto/evp/e_aes_cbc_hmac_sha1.c

+6 −3
Original line number Diff line number Diff line
@@ -845,7 +845,12 @@ static int aesni_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, 
    case EVP_CTRL_AEAD_TLS1_AAD:

        {

            unsigned char *p = ptr;

            unsigned int len = p[arg - 2] << 8 | p[arg - 1];

            unsigned int len;



            if (arg != EVP_AEAD_TLS1_AAD_LEN)

                return -1;

 

            len = p[arg - 2] << 8 | p[arg - 1];



            if (ctx->encrypt) {

                key->payload_length = len;
@@ -862,8 +867,6 @@ static int aesni_cbc_hmac_sha1_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, 
                               AES_BLOCK_SIZE) & -AES_BLOCK_SIZE)

                             - len);

            } else {

                if (arg > 13)

                    arg = 13;

                memcpy(key->aux.tls_aad, ptr, arg);

                key->payload_length = arg;

crypto/evp/e_aes_cbc_hmac_sha256.c

+5 −2
Original line number Diff line number Diff line
@@ -817,6 +817,11 @@ static int aesni_cbc_hmac_sha256_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, 
            unsigned char *p = ptr;

            unsigned int len = p[arg - 2] << 8 | p[arg - 1];



            if (arg != EVP_AEAD_TLS1_AAD_LEN)

                return -1;



            len = p[arg - 2] << 8 | p[arg - 1];



            if (ctx->encrypt) {

                key->payload_length = len;

                if ((key->aux.tls_ver =
@@ -832,8 +837,6 @@ static int aesni_cbc_hmac_sha256_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, 
                               AES_BLOCK_SIZE) & -AES_BLOCK_SIZE)

                             - len);

            } else {

                if (arg > 13)

                    arg = 13;

                memcpy(key->aux.tls_aad, ptr, arg);

                key->payload_length = arg;

crypto/evp/e_rc4_hmac_md5.c

+6 −1
Original line number Diff line number Diff line
@@ -257,7 +257,12 @@ static int rc4_hmac_md5_ctrl(EVP_CIPHER_CTX *ctx, int type, int arg, 
    case EVP_CTRL_AEAD_TLS1_AAD:

        {

            unsigned char *p = ptr;

            unsigned int len = p[arg - 2] << 8 | p[arg - 1];

            unsigned int len;



            if (arg != EVP_AEAD_TLS1_AAD_LEN)

                return -1;



            len = p[arg - 2] << 8 | p[arg - 1];



            if (!ctx->encrypt) {

                len -= MD5_DIGEST_LENGTH;