libcli/smb: add smb_key_derivation() for TREE_CONNECT_ANDX_EXTENDED_SIGNATURES support

metze

2 files changed, 49 insertions, 1 deletions

diff --git a/libcli/smb/smb_signing.c b/libcli/smb/smb_signing.c
index 2f7e8702ba..95c9c27c72 100644
--- a/libcli/smb/smb_signing.c
+++ b/libcli/smb/smb_signing.c
@@ -20,7 +20,7 @@
 */
 
 #include "includes.h"
-#include "../lib/crypto/md5.h"
+#include "../lib/crypto/crypto.h"
 #include "smb_common.h"
 #include "smb_signing.h"
 
@@ -455,3 +455,49 @@ bool smb_signing_is_negotiated(struct smb_signing_state *si)
 {
 	return si->negotiated;
 }
+
+void smb_key_derivation(const uint8_t *KI, size_t KI_len,
+			uint8_t KO[16])
+{
+	static const uint8_t SSKeyHash[256] = {
+		0x53, 0x65, 0x63, 0x75, 0x72, 0x69, 0x74, 0x79,
+		0x20, 0x53, 0x69, 0x67, 0x6e, 0x61, 0x74, 0x75,
+		0x72, 0x65, 0x20, 0x4b, 0x65, 0x79, 0x20, 0x55,
+		0x70, 0x67, 0x72, 0x61, 0x64, 0x65, 0x79, 0x07,
+		0x6e, 0x28, 0x2e, 0x69, 0x88, 0x10, 0xb3, 0xdb,
+		0x01, 0x55, 0x72, 0xfb, 0x74, 0x14, 0xfb, 0xc4,
+		0xc5, 0xaf, 0x3b, 0x41, 0x65, 0x32, 0x17, 0xba,
+		0xa3, 0x29, 0x08, 0xc1, 0xde, 0x16, 0x61, 0x7e,
+		0x66, 0x98, 0xa4, 0x0b, 0xfe, 0x06, 0x83, 0x53,
+		0x4d, 0x05, 0xdf, 0x6d, 0xa7, 0x51, 0x10, 0x73,
+		0xc5, 0x50, 0xdc, 0x5e, 0xf8, 0x21, 0x46, 0xaa,
+		0x96, 0x14, 0x33, 0xd7, 0x52, 0xeb, 0xaf, 0x1f,
+		0xbf, 0x36, 0x6c, 0xfc, 0xb7, 0x1d, 0x21, 0x19,
+		0x81, 0xd0, 0x6b, 0xfa, 0x77, 0xad, 0xbe, 0x18,
+		0x78, 0xcf, 0x10, 0xbd, 0xd8, 0x78, 0xf7, 0xd3,
+		0xc6, 0xdf, 0x43, 0x32, 0x19, 0xd3, 0x9b, 0xa8,
+		0x4d, 0x9e, 0xaa, 0x41, 0xaf, 0xcb, 0xc6, 0xb9,
+		0x34, 0xe7, 0x48, 0x25, 0xd4, 0x88, 0xc4, 0x51,
+		0x60, 0x38, 0xd9, 0x62, 0xe8, 0x8d, 0x5b, 0x83,
+		0x92, 0x7f, 0xb5, 0x0e, 0x1c, 0x2d, 0x06, 0x91,
+		0xc3, 0x75, 0xb3, 0xcc, 0xf8, 0xf7, 0x92, 0x91,
+		0x0b, 0x3d, 0xa1, 0x10, 0x5b, 0xd5, 0x0f, 0xa8,
+		0x3f, 0x5d, 0x13, 0x83, 0x0a, 0x6b, 0x72, 0x93,
+		0x14, 0x59, 0xd5, 0xab, 0xde, 0x26, 0x15, 0x6d,
+		0x60, 0x67, 0x71, 0x06, 0x6e, 0x3d, 0x0d, 0xa7,
+		0xcb, 0x70, 0xe9, 0x08, 0x5c, 0x99, 0xfa, 0x0a,
+		0x5f, 0x3d, 0x44, 0xa3, 0x8b, 0xc0, 0x8d, 0xda,
+		0xe2, 0x68, 0xd0, 0x0d, 0xcd, 0x7f, 0x3d, 0xf8,
+		0x73, 0x7e, 0x35, 0x7f, 0x07, 0x02, 0x0a, 0xb5,
+		0xe9, 0xb7, 0x87, 0xfb, 0xa1, 0xbf, 0xcb, 0x32,
+		0x31, 0x66, 0x09, 0x48, 0x88, 0xcc, 0x18, 0xa3,
+		0xb2, 0x1f, 0x1f, 0x1b, 0x90, 0x4e, 0xd7, 0xe1
+	};
+	HMACMD5Context ctx;
+
+	hmac_md5_init_limK_to_64(KI, KI_len, &ctx);
+	hmac_md5_update(SSKeyHash, sizeof(SSKeyHash), &ctx);
+	hmac_md5_final(KO, &ctx);
+
+	ZERO_STRUCT(ctx);
+}
diff --git a/libcli/smb/smb_signing.h b/libcli/smb/smb_signing.h
index 1e9e1dd812..7427ada2a6 100644
--- a/libcli/smb/smb_signing.h
+++ b/libcli/smb/smb_signing.h
@@ -51,5 +51,7 @@ bool smb_signing_is_mandatory(struct smb_signing_state *si);
 bool smb_signing_set_negotiated(struct smb_signing_state *si,
 				bool allowed, bool mandatory);
 bool smb_signing_is_negotiated(struct smb_signing_state *si);
+void smb_key_derivation(const uint8_t *KI, size_t KI_len,
+			uint8_t KO[16]);
 
 #endif /* _SMB_SIGNING_H_ */