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libcli/smb: add smb2_signing_[en|e]crypt_pdu()

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metze
This commit is contained in:
Stefan Metzmacher 2012-07-20 09:16:08 +02:00
parent 7e0982421b
commit fd736f7f18
2 changed files with 141 additions and 0 deletions
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132
libcli/smb/smb2_signing.c
View File

@ -207,3 +207,135 @@ void smb2_key_derivation(const uint8_t *KI, size_t KI_len,
memcpy(KO, digest, 16);
}
NTSTATUS smb2_signing_encrypt_pdu(DATA_BLOB encryption_key,
enum protocol_types protocol,
struct iovec *vector,
int count)
{
uint8_t *tf;
uint16_t alg;
uint8_t sig[16];
int i;
size_t a_total;
size_t m_total = 0;
struct aes_ccm_128_context ctx;
uint8_t key[AES_BLOCK_SIZE];
if (count < 1) {
return NT_STATUS_INVALID_PARAMETER;
}
if (vector[0].iov_len != SMB2_TF_HDR_SIZE) {
return NT_STATUS_INVALID_PARAMETER;
}
tf = (uint8_t *)vector[0].iov_base;
if (encryption_key.length == 0) {
DEBUG(2,("Wrong encryption key length %u for SMB2 signing\n",
(unsigned)encryption_key.length));
return NT_STATUS_ACCESS_DENIED;
}
alg = SMB2_ENCRYPTION_AES128_CCM;
SSVAL(tf, SMB2_TF_ALGORITHM, alg);
a_total = SMB2_TF_HDR_SIZE - SMB2_TF_NONCE;
for (i=1; i < count; i++) {
m_total += vector[i].iov_len;
}
ZERO_STRUCT(key);
memcpy(key, encryption_key.data,
MIN(encryption_key.length, AES_BLOCK_SIZE));
aes_ccm_128_init(&ctx, key,
tf + SMB2_TF_NONCE,
a_total, m_total);
aes_ccm_128_update(&ctx, tf + SMB2_TF_NONCE, a_total);
for (i=1; i < count; i++) {
aes_ccm_128_update(&ctx,
(const uint8_t *)vector[i].iov_base,
vector[i].iov_len);
}
for (i=1; i < count; i++) {
aes_ccm_128_crypt(&ctx,
(uint8_t *)vector[i].iov_base,
vector[i].iov_len);
}
aes_ccm_128_digest(&ctx, sig);
memcpy(tf + SMB2_TF_SIGNATURE, sig, 16);
DEBUG(5,("encrypt SMB2 message\n"));
return NT_STATUS_OK;
}
NTSTATUS smb2_signing_decrypt_pdu(DATA_BLOB decryption_key,
enum protocol_types protocol,
struct iovec *vector,
int count)
{
uint8_t *tf;
uint16_t alg;
uint8_t *sig_ptr = NULL;
uint8_t sig[16];
int i;
size_t a_total;
size_t m_total = 0;
struct aes_ccm_128_context ctx;
uint8_t key[AES_BLOCK_SIZE];
if (count < 1) {
return NT_STATUS_INVALID_PARAMETER;
}
if (vector[0].iov_len != SMB2_TF_HDR_SIZE) {
return NT_STATUS_INVALID_PARAMETER;
}
tf = (uint8_t *)vector[0].iov_base;
if (decryption_key.length == 0) {
DEBUG(2,("Wrong decryption key length %u for SMB2 signing\n",
(unsigned)decryption_key.length));
return NT_STATUS_ACCESS_DENIED;
}
alg = SVAL(tf, SMB2_TF_ALGORITHM);
if (alg != SMB2_ENCRYPTION_AES128_CCM) {
return NT_STATUS_ACCESS_DENIED;
}
a_total = SMB2_TF_HDR_SIZE - SMB2_TF_NONCE;
for (i=1; i < count; i++) {
m_total += vector[i].iov_len;
}
ZERO_STRUCT(key);
memcpy(key, decryption_key.data,
MIN(decryption_key.length, AES_BLOCK_SIZE));
aes_ccm_128_init(&ctx, key,
tf + SMB2_TF_NONCE,
a_total, m_total);
for (i=1; i < count; i++) {
aes_ccm_128_crypt(&ctx,
(uint8_t *)vector[i].iov_base,
vector[i].iov_len);
}
aes_ccm_128_update(&ctx, tf + SMB2_TF_NONCE, a_total);
for (i=1; i < count; i++) {
aes_ccm_128_update(&ctx,
( uint8_t *)vector[i].iov_base,
vector[i].iov_len);
}
aes_ccm_128_digest(&ctx, sig);
sig_ptr = tf + SMB2_TF_SIGNATURE;
if (memcmp(sig_ptr, sig, 16) != 0) {
return NT_STATUS_ACCESS_DENIED;
}
DEBUG(5,("decrypt SMB2 message\n"));
return NT_STATUS_OK;
}

9
libcli/smb/smb2_signing.h
View File

@ -38,4 +38,13 @@ void smb2_key_derivation(const uint8_t *KI, size_t KI_len,
const uint8_t *Context, size_t Context_len,
uint8_t KO[16]);
NTSTATUS smb2_signing_encrypt_pdu(DATA_BLOB encryption_key,
enum protocol_types protocol,
struct iovec *vector,
int count);
NTSTATUS smb2_signing_decrypt_pdu(DATA_BLOB decryption_key,
enum protocol_types protocol,
struct iovec *vector,
int count);
#endif /* _LIBCLI_SMB_SMB2_SIGNING_H_ */