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CIFS: add CONFIG_CIFS_DEBUG_KEYS to dump encryption keys

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Add new config option that dumps AES keys to the console when they are
generated. This is obviously for debugging purposes only, and should not
be enabled otherwise.

Signed-off-by: Aurelien Aptel <aaptel@suse.com>
Signed-off-by: Steve French <smfrench@gmail.com>
This commit is contained in:
Aurélien Aptel 2017-05-24 16:13:25 +02:00 committed by Steve French
parent 97b37f2416
commit d38de3c615
2 changed files with 34 additions and 3 deletions
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9
fs/cifs/Kconfig
View file

@ -146,6 +146,15 @@ config CIFS_DEBUG2
option can be turned off unless you are debugging
cifs problems. If unsure, say N.
config CIFS_DEBUG_DUMP_KEYS
bool "Dump encryption keys for offline decryption (Unsafe)"
depends on CIFS_DEBUG && CIFS_SMB2
help
Enabling this will dump the encryption and decryption keys
used to communicate on an encrypted share connection on the
console. This allows Wireshark to decrypt and dissect
encrypted network captures. Enable this carefully.
config CIFS_DFS_UPCALL
bool "DFS feature support"
depends on CIFS && KEYS

28
fs/cifs/smb2transport.c
View file

@ -335,9 +335,31 @@ generate_smb3signingkey(struct cifs_ses *ses,
if (rc)
return rc;
return generate_key(ses, ptriplet->decryption.label,
ptriplet->decryption.context,
ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
rc = generate_key(ses, ptriplet->decryption.label,
ptriplet->decryption.context,
ses->smb3decryptionkey, SMB3_SIGN_KEY_SIZE);
if (rc)
return rc;
#ifdef CONFIG_CIFS_DEBUG_DUMP_KEYS
cifs_dbg(VFS, "%s: dumping generated AES session keys\n", __func__);
/*
* The session id is opaque in terms of endianness, so we can't
* print it as a long long. we dump it as we got it on the wire
*/
cifs_dbg(VFS, "Session Id %*ph\n", (int)sizeof(ses->Suid),
&ses->Suid);
cifs_dbg(VFS, "Session Key %*ph\n",
SMB2_NTLMV2_SESSKEY_SIZE, ses->auth_key.response);
cifs_dbg(VFS, "Signing Key %*ph\n",
SMB3_SIGN_KEY_SIZE, ses->smb3signingkey);
cifs_dbg(VFS, "ServerIn Key %*ph\n",
SMB3_SIGN_KEY_SIZE, ses->smb3encryptionkey);
cifs_dbg(VFS, "ServerOut Key %*ph\n",
SMB3_SIGN_KEY_SIZE, ses->smb3decryptionkey);
#endif
return rc;
}
int