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-rw-r--r--source/libsmb/clispnego.c612
1 files changed, 612 insertions, 0 deletions
diff --git a/source/libsmb/clispnego.c b/source/libsmb/clispnego.c
new file mode 100644
index 00000000000..a962953b901
--- /dev/null
+++ b/source/libsmb/clispnego.c
@@ -0,0 +1,612 @@
+/*
+ Unix SMB/CIFS implementation.
+ simple kerberos5/SPNEGO routines
+ Copyright (C) Andrew Tridgell 2001
+
+ This program is free software; you can redistribute it and/or modify
+ it under the terms of the GNU General Public License as published by
+ the Free Software Foundation; either version 2 of the License, or
+ (at your option) any later version.
+
+ This program is distributed in the hope that it will be useful,
+ but WITHOUT ANY WARRANTY; without even the implied warranty of
+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ GNU General Public License for more details.
+
+ You should have received a copy of the GNU General Public License
+ along with this program; if not, write to the Free Software
+ Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include "includes.h"
+
+/*
+ generate a negTokenInit packet given a GUID, a list of supported
+ OIDs (the mechanisms) and a principal name string
+*/
+DATA_BLOB spnego_gen_negTokenInit(uint8 guid[16],
+ const char *OIDs[],
+ const char *principal)
+{
+ int i;
+ ASN1_DATA data;
+ DATA_BLOB ret;
+
+ memset(&data, 0, sizeof(data));
+
+ asn1_write(&data, guid, 16);
+ asn1_push_tag(&data,ASN1_APPLICATION(0));
+ asn1_write_OID(&data,OID_SPNEGO);
+ asn1_push_tag(&data,ASN1_CONTEXT(0));
+ asn1_push_tag(&data,ASN1_SEQUENCE(0));
+
+ asn1_push_tag(&data,ASN1_CONTEXT(0));
+ asn1_push_tag(&data,ASN1_SEQUENCE(0));
+ for (i=0; OIDs[i]; i++) {
+ asn1_write_OID(&data,OIDs[i]);
+ }
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ asn1_push_tag(&data, ASN1_CONTEXT(3));
+ asn1_push_tag(&data, ASN1_SEQUENCE(0));
+ asn1_push_tag(&data, ASN1_CONTEXT(0));
+ asn1_write_GeneralString(&data,principal);
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ asn1_pop_tag(&data);
+
+ if (data.has_error) {
+ DEBUG(1,("Failed to build negTokenInit at offset %d\n", (int)data.ofs));
+ asn1_free(&data);
+ }
+
+ ret = data_blob(data.data, data.length);
+ asn1_free(&data);
+
+ return ret;
+}
+
+
+/*
+ parse a negTokenInit packet giving a GUID, a list of supported
+ OIDs (the mechanisms) and a principal name string
+*/
+BOOL spnego_parse_negTokenInit(DATA_BLOB blob,
+ uint8 guid[16],
+ char *OIDs[ASN1_MAX_OIDS],
+ char **principal)
+{
+ int i;
+ BOOL ret;
+ ASN1_DATA data;
+
+ asn1_load(&data, blob);
+
+ asn1_read(&data, guid, 16);
+ asn1_start_tag(&data,ASN1_APPLICATION(0));
+ asn1_check_OID(&data,OID_SPNEGO);
+ asn1_start_tag(&data,ASN1_CONTEXT(0));
+ asn1_start_tag(&data,ASN1_SEQUENCE(0));
+
+ asn1_start_tag(&data,ASN1_CONTEXT(0));
+ asn1_start_tag(&data,ASN1_SEQUENCE(0));
+ for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS; i++) {
+ char *oid = NULL;
+ asn1_read_OID(&data,&oid);
+ OIDs[i] = oid;
+ }
+ OIDs[i] = NULL;
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ asn1_start_tag(&data, ASN1_CONTEXT(3));
+ asn1_start_tag(&data, ASN1_SEQUENCE(0));
+ asn1_start_tag(&data, ASN1_CONTEXT(0));
+ asn1_read_GeneralString(&data,principal);
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ asn1_end_tag(&data);
+
+ ret = !data.has_error;
+ asn1_free(&data);
+ return ret;
+}
+
+
+/*
+ generate a negTokenTarg packet given a list of OIDs and a security blob
+*/
+DATA_BLOB gen_negTokenTarg(const char *OIDs[], DATA_BLOB blob)
+{
+ int i;
+ ASN1_DATA data;
+ DATA_BLOB ret;
+
+ memset(&data, 0, sizeof(data));
+
+ asn1_push_tag(&data, ASN1_APPLICATION(0));
+ asn1_write_OID(&data,OID_SPNEGO);
+ asn1_push_tag(&data, ASN1_CONTEXT(0));
+ asn1_push_tag(&data, ASN1_SEQUENCE(0));
+
+ asn1_push_tag(&data, ASN1_CONTEXT(0));
+ asn1_push_tag(&data, ASN1_SEQUENCE(0));
+ for (i=0; OIDs[i]; i++) {
+ asn1_write_OID(&data,OIDs[i]);
+ }
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ asn1_push_tag(&data, ASN1_CONTEXT(2));
+ asn1_write_OctetString(&data,blob.data,blob.length);
+ asn1_pop_tag(&data);
+
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ asn1_pop_tag(&data);
+
+ if (data.has_error) {
+ DEBUG(1,("Failed to build negTokenTarg at offset %d\n", (int)data.ofs));
+ asn1_free(&data);
+ }
+
+ ret = data_blob(data.data, data.length);
+ asn1_free(&data);
+
+ return ret;
+}
+
+
+/*
+ parse a negTokenTarg packet giving a list of OIDs and a security blob
+*/
+BOOL parse_negTokenTarg(DATA_BLOB blob, char *OIDs[ASN1_MAX_OIDS], DATA_BLOB *secblob)
+{
+ int i;
+ ASN1_DATA data;
+
+ asn1_load(&data, blob);
+ asn1_start_tag(&data, ASN1_APPLICATION(0));
+ asn1_check_OID(&data,OID_SPNEGO);
+ asn1_start_tag(&data, ASN1_CONTEXT(0));
+ asn1_start_tag(&data, ASN1_SEQUENCE(0));
+
+ asn1_start_tag(&data, ASN1_CONTEXT(0));
+ asn1_start_tag(&data, ASN1_SEQUENCE(0));
+ for (i=0; asn1_tag_remaining(&data) > 0 && i < ASN1_MAX_OIDS; i++) {
+ char *oid = NULL;
+ asn1_read_OID(&data,&oid);
+ OIDs[i] = oid;
+ }
+ OIDs[i] = NULL;
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ asn1_start_tag(&data, ASN1_CONTEXT(2));
+ asn1_read_OctetString(&data,secblob);
+ asn1_end_tag(&data);
+
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ asn1_end_tag(&data);
+
+ if (data.has_error) {
+ DEBUG(1,("Failed to parse negTokenTarg at offset %d\n", (int)data.ofs));
+ asn1_free(&data);
+ return False;
+ }
+
+ asn1_free(&data);
+ return True;
+}
+
+/*
+ generate a krb5 GSS-API wrapper packet given a ticket
+*/
+DATA_BLOB spnego_gen_krb5_wrap(DATA_BLOB ticket)
+{
+ ASN1_DATA data;
+ DATA_BLOB ret;
+
+ memset(&data, 0, sizeof(data));
+
+ asn1_push_tag(&data, ASN1_APPLICATION(0));
+ asn1_write_OID(&data, OID_KERBEROS5);
+ asn1_write_BOOLEAN(&data, 0);
+ asn1_write(&data, ticket.data, ticket.length);
+ asn1_pop_tag(&data);
+
+ if (data.has_error) {
+ DEBUG(1,("Failed to build krb5 wrapper at offset %d\n", (int)data.ofs));
+ asn1_free(&data);
+ }
+
+ ret = data_blob(data.data, data.length);
+ asn1_free(&data);
+
+ return ret;
+}
+
+/*
+ parse a krb5 GSS-API wrapper packet giving a ticket
+*/
+BOOL spnego_parse_krb5_wrap(DATA_BLOB blob, DATA_BLOB *ticket)
+{
+ BOOL ret;
+ ASN1_DATA data;
+
+ asn1_load(&data, blob);
+ asn1_start_tag(&data, ASN1_APPLICATION(0));
+ asn1_check_OID(&data, OID_KERBEROS5);
+ asn1_check_BOOLEAN(&data, 0);
+ *ticket = data_blob(data.data, asn1_tag_remaining(&data));
+ asn1_read(&data, ticket->data, ticket->length);
+ asn1_end_tag(&data);
+
+ ret = !data.has_error;
+
+ asn1_free(&data);
+
+ return ret;
+}
+
+
+/*
+ generate a SPNEGO negTokenTarg packet, ready for a EXTENDED_SECURITY
+ kerberos session setup
+*/
+DATA_BLOB spnego_gen_negTokenTarg(struct cli_state *cli, char *principal)
+{
+ DATA_BLOB tkt, tkt_wrapped, targ;
+ const char *krb_mechs[] = {OID_KERBEROS5_OLD, OID_NTLMSSP, NULL};
+
+ /* get a kerberos ticket for the service */
+ tkt = krb5_get_ticket(principal);
+
+ /* wrap that up in a nice GSS-API wrapping */
+ tkt_wrapped = spnego_gen_krb5_wrap(tkt);
+
+ /* and wrap that in a shiny SPNEGO wrapper */
+ targ = gen_negTokenTarg(krb_mechs, tkt_wrapped);
+
+ data_blob_free(&tkt_wrapped);
+ data_blob_free(&tkt);
+
+ return targ;
+}
+
+
+/*
+ parse a spnego NTLMSSP challenge packet giving two security blobs
+*/
+BOOL spnego_parse_challenge(DATA_BLOB blob,
+ DATA_BLOB *chal1, DATA_BLOB *chal2)
+{
+ BOOL ret;
+ ASN1_DATA data;
+
+ ZERO_STRUCTP(chal1);
+ ZERO_STRUCTP(chal2);
+
+ asn1_load(&data, blob);
+ asn1_start_tag(&data,ASN1_CONTEXT(1));
+ asn1_start_tag(&data,ASN1_SEQUENCE(0));
+
+ asn1_start_tag(&data,ASN1_CONTEXT(0));
+ asn1_check_enumerated(&data,1);
+ asn1_end_tag(&data);
+
+ asn1_start_tag(&data,ASN1_CONTEXT(1));
+ asn1_check_OID(&data, OID_NTLMSSP);
+ asn1_end_tag(&data);
+
+ asn1_start_tag(&data,ASN1_CONTEXT(2));
+ asn1_read_OctetString(&data, chal1);
+ asn1_end_tag(&data);
+
+ /* the second challenge is optional (XP doesn't send it) */
+ if (asn1_tag_remaining(&data)) {
+ asn1_start_tag(&data,ASN1_CONTEXT(3));
+ asn1_read_OctetString(&data, chal2);
+ asn1_end_tag(&data);
+ }
+
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ ret = !data.has_error;
+ asn1_free(&data);
+ return ret;
+}
+
+
+/*
+ generate a spnego NTLMSSP challenge packet given two security blobs
+ The second challenge is optional
+*/
+BOOL spnego_gen_challenge(DATA_BLOB *blob,
+ DATA_BLOB *chal1, DATA_BLOB *chal2)
+{
+ ASN1_DATA data;
+
+ ZERO_STRUCT(data);
+
+ asn1_push_tag(&data,ASN1_CONTEXT(1));
+ asn1_push_tag(&data,ASN1_SEQUENCE(0));
+
+ asn1_push_tag(&data,ASN1_CONTEXT(0));
+ asn1_write_enumerated(&data,1);
+ asn1_pop_tag(&data);
+
+ asn1_push_tag(&data,ASN1_CONTEXT(1));
+ asn1_write_OID(&data, OID_NTLMSSP);
+ asn1_pop_tag(&data);
+
+ asn1_push_tag(&data,ASN1_CONTEXT(2));
+ asn1_write_OctetString(&data, chal1->data, chal1->length);
+ asn1_pop_tag(&data);
+
+ /* the second challenge is optional (XP doesn't send it) */
+ if (chal2) {
+ asn1_push_tag(&data,ASN1_CONTEXT(3));
+ asn1_write_OctetString(&data, chal2->data, chal2->length);
+ asn1_pop_tag(&data);
+ }
+
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ if (data.has_error) {
+ return False;
+ }
+
+ *blob = data_blob(data.data, data.length);
+ asn1_free(&data);
+ return True;
+}
+
+/*
+ generate a SPNEGO NTLMSSP auth packet. This will contain the encrypted passwords
+*/
+DATA_BLOB spnego_gen_auth(DATA_BLOB blob)
+{
+ ASN1_DATA data;
+ DATA_BLOB ret;
+
+ memset(&data, 0, sizeof(data));
+
+ asn1_push_tag(&data, ASN1_CONTEXT(1));
+ asn1_push_tag(&data, ASN1_SEQUENCE(0));
+ asn1_push_tag(&data, ASN1_CONTEXT(2));
+ asn1_write_OctetString(&data,blob.data,blob.length);
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+ asn1_pop_tag(&data);
+
+ ret = data_blob(data.data, data.length);
+
+ asn1_free(&data);
+
+ return ret;
+}
+
+/*
+ parse a SPNEGO NTLMSSP auth packet. This contains the encrypted passwords
+*/
+BOOL spnego_parse_auth(DATA_BLOB blob, DATA_BLOB *auth)
+{
+ ASN1_DATA data;
+
+ asn1_load(&data, blob);
+ asn1_start_tag(&data, ASN1_CONTEXT(1));
+ asn1_start_tag(&data, ASN1_SEQUENCE(0));
+ asn1_start_tag(&data, ASN1_CONTEXT(2));
+ asn1_read_OctetString(&data,auth);
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+ asn1_end_tag(&data);
+
+ if (data.has_error) {
+ DEBUG(3,("spnego_parse_auth failed at %d\n", (int)data.ofs));
+ asn1_free(&data);
+ return False;
+ }
+
+ asn1_free(&data);
+ return True;
+}
+
+
+/*
+ this is a tiny msrpc packet generator. I am only using this to
+ avoid tying this code to a particular varient of our rpc code. This
+ generator is not general enough for all our rpc needs, its just
+ enough for the spnego/ntlmssp code
+
+ format specifiers are:
+
+ U = unicode string (input is unix string)
+ B = data blob (pointer + length)
+ b = data blob in header (pointer + length)
+ d = word (4 bytes)
+ C = constant ascii string
+ */
+BOOL msrpc_gen(DATA_BLOB *blob,
+ const char *format, ...)
+{
+ int i, n;
+ va_list ap;
+ char *s;
+ uint8 *b;
+ int head_size=0, data_size=0;
+ int head_ofs, data_ofs;
+
+ /* first scan the format to work out the header and body size */
+ va_start(ap, format);
+ for (i=0; format[i]; i++) {
+ switch (format[i]) {
+ case 'U':
+ s = va_arg(ap, char *);
+ head_size += 8;
+ data_size += str_charnum(s) * 2;
+ break;
+ case 'B':
+ b = va_arg(ap, uint8 *);
+ head_size += 8;
+ data_size += va_arg(ap, int);
+ break;
+ case 'b':
+ b = va_arg(ap, uint8 *);
+ head_size += va_arg(ap, int);
+ break;
+ case 'd':
+ n = va_arg(ap, int);
+ head_size += 4;
+ break;
+ case 'C':
+ s = va_arg(ap, char *);
+ head_size += str_charnum(s) + 1;
+ break;
+ }
+ }
+ va_end(ap);
+
+ /* allocate the space, then scan the format again to fill in the values */
+ *blob = data_blob(NULL, head_size + data_size);
+
+ head_ofs = 0;
+ data_ofs = head_size;
+
+ va_start(ap, format);
+ for (i=0; format[i]; i++) {
+ switch (format[i]) {
+ case 'U':
+ s = va_arg(ap, char *);
+ n = str_charnum(s);
+ SSVAL(blob->data, head_ofs, n*2); head_ofs += 2;
+ SSVAL(blob->data, head_ofs, n*2); head_ofs += 2;
+ SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
+ push_string(NULL, blob->data+data_ofs, s, n*2, STR_UNICODE|STR_NOALIGN);
+ data_ofs += n*2;
+ break;
+ case 'B':
+ b = va_arg(ap, uint8 *);
+ n = va_arg(ap, int);
+ SSVAL(blob->data, head_ofs, n); head_ofs += 2;
+ SSVAL(blob->data, head_ofs, n); head_ofs += 2;
+ SIVAL(blob->data, head_ofs, data_ofs); head_ofs += 4;
+ memcpy(blob->data+data_ofs, b, n);
+ data_ofs += n;
+ break;
+ case 'd':
+ n = va_arg(ap, int);
+ SIVAL(blob->data, head_ofs, n); head_ofs += 4;
+ break;
+ case 'b':
+ b = va_arg(ap, uint8 *);
+ n = va_arg(ap, int);
+ memcpy(blob->data + head_ofs, b, n);
+ head_ofs += n;
+ break;
+ case 'C':
+ s = va_arg(ap, char *);
+ head_ofs += push_string(NULL, blob->data+head_ofs, s, -1,
+ STR_ASCII|STR_TERMINATE);
+ break;
+ }
+ }
+ va_end(ap);
+
+ return True;
+}
+
+
+/*
+ this is a tiny msrpc packet parser. This the the partner of msrpc_gen
+
+ format specifiers are:
+
+ U = unicode string (input is unix string)
+ B = data blob
+ b = data blob in header
+ d = word (4 bytes)
+ C = constant ascii string
+ */
+BOOL msrpc_parse(DATA_BLOB *blob,
+ const char *format, ...)
+{
+ int i;
+ va_list ap;
+ char **ps, *s;
+ DATA_BLOB *b;
+ int head_ofs = 0;
+ uint16 len1, len2;
+ uint32 ptr;
+ uint32 *v;
+ pstring p;
+
+ va_start(ap, format);
+ for (i=0; format[i]; i++) {
+ switch (format[i]) {
+ case 'U':
+ len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
+ len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
+ ptr = IVAL(blob->data, head_ofs); head_ofs += 4;
+ /* make sure its in the right format - be strict */
+ if (len1 != len2 || (len1&1) || ptr + len1 > blob->length) {
+ return False;
+ }
+ ps = va_arg(ap, char **);
+ pull_string(NULL, p, blob->data + ptr, -1, len1,
+ STR_UNICODE|STR_NOALIGN);
+ (*ps) = strdup(p);
+ break;
+ case 'B':
+ len1 = SVAL(blob->data, head_ofs); head_ofs += 2;
+ len2 = SVAL(blob->data, head_ofs); head_ofs += 2;
+ ptr = IVAL(blob->data, head_ofs); head_ofs += 4;
+ /* make sure its in the right format - be strict */
+ if (len1 != len2 || ptr + len1 > blob->length) {
+ return False;
+ }
+ b = (DATA_BLOB *)va_arg(ap, void *);
+ *b = data_blob(blob->data + ptr, len1);
+ break;
+ case 'b':
+ b = (DATA_BLOB *)va_arg(ap, void *);
+ len1 = va_arg(ap, unsigned);
+ *b = data_blob(blob->data + head_ofs, len1);
+ head_ofs += len1;
+ break;
+ case 'd':
+ v = va_arg(ap, uint32 *);
+ *v = IVAL(blob->data, head_ofs); head_ofs += 4;
+ break;
+ case 'C':
+ s = va_arg(ap, char *);
+ head_ofs += pull_string(NULL, p, blob->data+head_ofs, -1,
+ blob->length - head_ofs,
+ STR_ASCII|STR_TERMINATE);
+ if (strcmp(s, p) != 0) {
+ return False;
+ }
+ break;
+ }
+ }
+ va_end(ap);
+
+ return True;
+}
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