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| author | Matt Caswell <matt@openssl.org> | 2015-04-27 11:07:06 +0100 |
|---|---|---|
| committer | Matt Caswell <matt@openssl.org> | 2015-04-30 23:12:39 +0100 |
| commit | c8269881093324b881b81472be037055571f73f3 (patch) | |
| tree | c427132f22ce43de444522428b0c1fe6c193402d /crypto/evp | |
| parent | 873fb39f20b6763daba226b74e83fb194924c7bf (diff) | |
| download | openssl-c8269881093324b881b81472be037055571f73f3.zip openssl-c8269881093324b881b81472be037055571f73f3.tar.gz openssl-c8269881093324b881b81472be037055571f73f3.tar.bz2 | |
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: Andy Polyakov <appro@openssl.org>
Diffstat (limited to 'crypto/evp')
| -rw-r--r-- | crypto/evp/e_aes.c | 2 | ||||
| -rw-r--r-- | crypto/evp/e_aes_cbc_hmac_sha1.c | 9 | ||||
| -rw-r--r-- | crypto/evp/e_aes_cbc_hmac_sha256.c | 7 | ||||
| -rw-r--r-- | crypto/evp/e_rc4_hmac_md5.c | 7 |
4 files changed, 18 insertions, 7 deletions
diff --git a/crypto/evp/e_aes.c b/crypto/evp/e_aes.c index 7b4d84f..0b7838e 100644 --- a/crypto/evp/e_aes.c +++ b/crypto/evp/e_aes.c @@ -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; diff --git a/crypto/evp/e_aes_cbc_hmac_sha1.c b/crypto/evp/e_aes_cbc_hmac_sha1.c index 960be3c..7f2848e 100644 --- a/crypto/evp/e_aes_cbc_hmac_sha1.c +++ b/crypto/evp/e_aes_cbc_hmac_sha1.c @@ -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; diff --git a/crypto/evp/e_aes_cbc_hmac_sha256.c b/crypto/evp/e_aes_cbc_hmac_sha256.c index bea8f6d..3b6827a 100644 --- a/crypto/evp/e_aes_cbc_hmac_sha256.c +++ b/crypto/evp/e_aes_cbc_hmac_sha256.c @@ -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; diff --git a/crypto/evp/e_rc4_hmac_md5.c b/crypto/evp/e_rc4_hmac_md5.c index 7c4bd34..1ba690d 100644 --- a/crypto/evp/e_rc4_hmac_md5.c +++ b/crypto/evp/e_rc4_hmac_md5.c @@ -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; |