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Diffstat (limited to 'fs/cifs/cifsencrypt.c')
-rw-r--r--fs/cifs/cifsencrypt.c146
1 files changed, 129 insertions, 17 deletions
diff --git a/fs/cifs/cifsencrypt.c b/fs/cifs/cifsencrypt.c
index 35042d8f733..89fb94fac4b 100644
--- a/fs/cifs/cifsencrypt.c
+++ b/fs/cifs/cifsencrypt.c
@@ -27,6 +27,7 @@
#include "md5.h"
#include "cifs_unicode.h"
#include "cifsproto.h"
+#include "ntlmssp.h"
#include <linux/ctype.h>
#include <linux/random.h>
@@ -42,7 +43,7 @@ extern void SMBencrypt(unsigned char *passwd, const unsigned char *c8,
unsigned char *p24);
static int cifs_calculate_signature(const struct smb_hdr *cifs_pdu,
- const struct mac_key *key, char *signature)
+ const struct session_key *key, char *signature)
{
struct MD5Context context;
@@ -78,7 +79,7 @@ int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
server->sequence_number++;
spin_unlock(&GlobalMid_Lock);
- rc = cifs_calculate_signature(cifs_pdu, &server->mac_signing_key,
+ rc = cifs_calculate_signature(cifs_pdu, &server->session_key,
smb_signature);
if (rc)
memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
@@ -89,7 +90,7 @@ int cifs_sign_smb(struct smb_hdr *cifs_pdu, struct TCP_Server_Info *server,
}
static int cifs_calc_signature2(const struct kvec *iov, int n_vec,
- const struct mac_key *key, char *signature)
+ const struct session_key *key, char *signature)
{
struct MD5Context context;
int i;
@@ -145,7 +146,7 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
server->sequence_number++;
spin_unlock(&GlobalMid_Lock);
- rc = cifs_calc_signature2(iov, n_vec, &server->mac_signing_key,
+ rc = cifs_calc_signature2(iov, n_vec, &server->session_key,
smb_signature);
if (rc)
memset(cifs_pdu->Signature.SecuritySignature, 0, 8);
@@ -156,14 +157,14 @@ int cifs_sign_smb2(struct kvec *iov, int n_vec, struct TCP_Server_Info *server,
}
int cifs_verify_signature(struct smb_hdr *cifs_pdu,
- const struct mac_key *mac_key,
+ const struct session_key *session_key,
__u32 expected_sequence_number)
{
unsigned int rc;
char server_response_sig[8];
char what_we_think_sig_should_be[20];
- if ((cifs_pdu == NULL) || (mac_key == NULL))
+ if (cifs_pdu == NULL || session_key == NULL)
return -EINVAL;
if (cifs_pdu->Command == SMB_COM_NEGOTIATE)
@@ -192,7 +193,7 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu,
cpu_to_le32(expected_sequence_number);
cifs_pdu->Signature.Sequence.Reserved = 0;
- rc = cifs_calculate_signature(cifs_pdu, mac_key,
+ rc = cifs_calculate_signature(cifs_pdu, session_key,
what_we_think_sig_should_be);
if (rc)
@@ -209,7 +210,7 @@ int cifs_verify_signature(struct smb_hdr *cifs_pdu,
}
/* We fill in key by putting in 40 byte array which was allocated by caller */
-int cifs_calculate_mac_key(struct mac_key *key, const char *rn,
+int cifs_calculate_session_key(struct session_key *key, const char *rn,
const char *password)
{
char temp_key[16];
@@ -262,6 +263,90 @@ void calc_lanman_hash(const char *password, const char *cryptkey, bool encrypt,
}
#endif /* CIFS_WEAK_PW_HASH */
+/* This is just a filler for ntlmv2 type of security mechanisms.
+ * Older servers are not very particular about the contents of av pairs
+ * in the blob and for sec mechs like ntlmv2, there is no negotiation
+ * as in ntlmssp, so unless domain and server netbios and dns names
+ * are specified, there is no way to obtain name. In case of ntlmssp,
+ * server provides that info in type 2 challenge packet
+ */
+static int
+build_avpair_blob(struct cifsSesInfo *ses)
+{
+ struct ntlmssp2_name *attrptr;
+
+ ses->tilen = 2 * sizeof(struct ntlmssp2_name);
+ ses->tiblob = kzalloc(ses->tilen, GFP_KERNEL);
+ if (!ses->tiblob) {
+ ses->tilen = 0;
+ cERROR(1, "Challenge target info allocation failure");
+ return -ENOMEM;
+ }
+ attrptr = (struct ntlmssp2_name *) ses->tiblob;
+ attrptr->type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
+
+ return 0;
+}
+
+/* Server has provided av pairs/target info in the type 2 challenge
+ * packet and we have plucked it and stored within smb session.
+ * We parse that blob here to find netbios domain name to be used
+ * as part of ntlmv2 authentication (in Target String), if not already
+ * specified on the command line.
+ * If this function returns without any error but without fetching
+ * domain name, authentication may fail against some server but
+ * may not fail against other (those who are not very particular
+ * about target string i.e. for some, just user name might suffice.
+ */
+static int
+find_domain_name(struct cifsSesInfo *ses)
+{
+ unsigned int attrsize;
+ unsigned int type;
+ unsigned int onesize = sizeof(struct ntlmssp2_name);
+ unsigned char *blobptr;
+ unsigned char *blobend;
+ struct ntlmssp2_name *attrptr;
+
+ if (!ses->tilen || !ses->tiblob)
+ return 0;
+
+ blobptr = ses->tiblob;
+ blobend = ses->tiblob + ses->tilen;
+
+ while (blobptr + onesize < blobend) {
+ attrptr = (struct ntlmssp2_name *) blobptr;
+ type = le16_to_cpu(attrptr->type);
+ if (type == NTLMSSP_AV_EOL)
+ break;
+ blobptr += 2; /* advance attr type */
+ attrsize = le16_to_cpu(attrptr->length);
+ blobptr += 2; /* advance attr size */
+ if (blobptr + attrsize > blobend)
+ break;
+ if (type == NTLMSSP_AV_NB_DOMAIN_NAME) {
+ if (!attrsize)
+ break;
+ if (!ses->domainName) {
+ struct nls_table *default_nls;
+ ses->domainName =
+ kmalloc(attrsize + 1, GFP_KERNEL);
+ if (!ses->domainName)
+ return -ENOMEM;
+ default_nls = load_nls_default();
+ cifs_from_ucs2(ses->domainName,
+ (__le16 *)blobptr, attrsize, attrsize,
+ default_nls, false);
+ unload_nls(default_nls);
+ break;
+ }
+ }
+ blobptr += attrsize; /* advance attr value */
+ }
+
+ return 0;
+}
+
static int calc_ntlmv2_hash(struct cifsSesInfo *ses,
const struct nls_table *nls_cp)
{
@@ -321,7 +406,8 @@ calc_exit_2:
return rc;
}
-void setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
+int
+setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
const struct nls_table *nls_cp)
{
int rc;
@@ -333,25 +419,48 @@ void setup_ntlmv2_rsp(struct cifsSesInfo *ses, char *resp_buf,
buf->time = cpu_to_le64(cifs_UnixTimeToNT(CURRENT_TIME));
get_random_bytes(&buf->client_chal, sizeof(buf->client_chal));
buf->reserved2 = 0;
- buf->names[0].type = cpu_to_le16(NTLMSSP_DOMAIN_TYPE);
- buf->names[0].length = 0;
- buf->names[1].type = 0;
- buf->names[1].length = 0;
+
+ if (ses->server->secType == RawNTLMSSP) {
+ if (!ses->domainName) {
+ rc = find_domain_name(ses);
+ if (rc) {
+ cERROR(1, "error %d finding domain name", rc);
+ goto setup_ntlmv2_rsp_ret;
+ }
+ }
+ } else {
+ rc = build_avpair_blob(ses);
+ if (rc) {
+ cERROR(1, "error %d building av pair blob", rc);
+ return rc;
+ }
+ }
/* calculate buf->ntlmv2_hash */
rc = calc_ntlmv2_hash(ses, nls_cp);
- if (rc)
+ if (rc) {
cERROR(1, "could not get v2 hash rc %d", rc);
+ goto setup_ntlmv2_rsp_ret;
+ }
CalcNTLMv2_response(ses, resp_buf);
/* now calculate the MAC key for NTLMv2 */
hmac_md5_init_limK_to_64(ses->server->ntlmv2_hash, 16, &context);
hmac_md5_update(resp_buf, 16, &context);
- hmac_md5_final(ses->server->mac_signing_key.data.ntlmv2.key, &context);
+ hmac_md5_final(ses->server->session_key.data.ntlmv2.key, &context);
- memcpy(&ses->server->mac_signing_key.data.ntlmv2.resp, resp_buf,
+ memcpy(&ses->server->session_key.data.ntlmv2.resp, resp_buf,
sizeof(struct ntlmv2_resp));
- ses->server->mac_signing_key.len = 16 + sizeof(struct ntlmv2_resp);
+ ses->server->session_key.len = 16 + sizeof(struct ntlmv2_resp);
+
+ return 0;
+
+setup_ntlmv2_rsp_ret:
+ kfree(ses->tiblob);
+ ses->tiblob = NULL;
+ ses->tilen = 0;
+
+ return rc;
}
void CalcNTLMv2_response(const struct cifsSesInfo *ses,
@@ -365,6 +474,9 @@ void CalcNTLMv2_response(const struct cifsSesInfo *ses,
hmac_md5_update(v2_session_response+8,
sizeof(struct ntlmv2_resp) - 8, &context);
+ if (ses->tilen)
+ hmac_md5_update(ses->tiblob, ses->tilen, &context);
+
hmac_md5_final(v2_session_response, &context);
/* cifs_dump_mem("v2_sess_rsp: ", v2_session_response, 32); */
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-29 09:36:37 +0000