From b728042334f67738fd1a6fdd03e619bdb78fe06a Mon Sep 17 00:00:00 2001 From: Andrew Tridgell Date: Wed, 17 Oct 2001 08:54:19 +0000 Subject: added basic NTLMSSP support in smbd. This is still quite rough, and loses things like username mapping. I wanted to get this in then discuss it a bit to see how we want to split up the existing session setup code (This used to be commit b74fda69bf23207c26d8b2af23910d8f2eb89875) --- source3/libsmb/asn1.c | 28 ++++-- source3/libsmb/cliconnect.c | 32 ++++--- source3/libsmb/clientgen.c | 2 +- source3/libsmb/clispnego.c | 222 ++++++++++++++++++++++++++++++++++++++++++-- 4 files changed, 258 insertions(+), 26 deletions(-) (limited to 'source3/libsmb') diff --git a/source3/libsmb/asn1.c b/source3/libsmb/asn1.c index e72da897b9..59763408cf 100644 --- a/source3/libsmb/asn1.c +++ b/source3/libsmb/asn1.c @@ -87,13 +87,18 @@ BOOL asn1_pop_tag(ASN1_DATA *data) /* yes, this is ugly. We don't know in advance how many bytes the length of a tag will take, so we assumed 1 byte. If we were wrong then we need to correct our mistake */ - if (len > 127) { + if (len > 255) { data->data[nesting->start] = 0x82; if (!asn1_write_uint8(data, 0)) return False; if (!asn1_write_uint8(data, 0)) return False; memmove(data->data+nesting->start+3, data->data+nesting->start+1, len); data->data[nesting->start+1] = len>>8; data->data[nesting->start+2] = len&0xff; + } else if (len > 127) { + data->data[nesting->start] = 0x81; + if (!asn1_write_uint8(data, 0)) return False; + memmove(data->data+nesting->start+2, data->data+nesting->start+1, len); + data->data[nesting->start+1] = len; } else { data->data[nesting->start] = len; } @@ -203,14 +208,16 @@ BOOL asn1_start_tag(ASN1_DATA *data, uint8 tag) asn1_read_uint8(data, &b); if (b & 0x80) { int n = b & 0x7f; - if (n != 2) { + if (n > 2) { data->has_error = True; return False; } asn1_read_uint8(data, &b); - nesting->taglen = b<<8; - asn1_read_uint8(data, &b); - nesting->taglen |= b; + nesting->taglen = b; + if (n == 2) { + asn1_read_uint8(data, &b); + nesting->taglen = (nesting->taglen << 8) | b; + } } else { nesting->taglen = b; } @@ -320,7 +327,7 @@ BOOL asn1_read_GeneralString(ASN1_DATA *data, char **s) } /* read a octet string blob */ -BOOL asn1_read_octet_string(ASN1_DATA *data, DATA_BLOB *blob) +BOOL asn1_read_OctetString(ASN1_DATA *data, DATA_BLOB *blob) { int len; if (!asn1_start_tag(data, ASN1_OCTET_STRING)) return False; @@ -345,3 +352,12 @@ BOOL asn1_check_enumerated(ASN1_DATA *data, int v) asn1_end_tag(data); return !data->has_error && (v == b); } + +/* check a enumarted value is correct */ +BOOL asn1_write_enumerated(ASN1_DATA *data, uint8 v) +{ + if (!asn1_push_tag(data, ASN1_ENUMERATED)) return False; + asn1_write_uint8(data, v); + asn1_pop_tag(data); + return !data->has_error; +} diff --git a/source3/libsmb/cliconnect.c b/source3/libsmb/cliconnect.c index 94eda90a3b..6a01744240 100644 --- a/source3/libsmb/cliconnect.c +++ b/source3/libsmb/cliconnect.c @@ -31,11 +31,12 @@ static struct { prots[] = { {PROTOCOL_CORE,"PC NETWORK PROGRAM 1.0"}, + {PROTOCOL_COREPLUS,"MICROSOFT NETWORKS 1.03"}, + {PROTOCOL_LANMAN1,"MICROSOFT NETWORKS 3.0"}, {PROTOCOL_LANMAN1,"LANMAN1.0"}, - {PROTOCOL_LANMAN1,"Windows for Workgroups 3.1a"}, {PROTOCOL_LANMAN2,"LM1.2X002"}, - {PROTOCOL_NT1,"Samba"}, - {PROTOCOL_NT1,"LANMAN2.1"}, + {PROTOCOL_LANMAN2,"Samba"}, + {PROTOCOL_NT1,"NT LANMAN 1.0"}, {PROTOCOL_NT1,"NT LM 0.12"}, {-1,NULL} }; @@ -394,7 +395,7 @@ static BOOL cli_session_setup_kerberos(struct cli_state *cli, char *principle, c blob2 = cli_session_setup_blob(cli, negTokenTarg); /* we don't need this blob for kerberos */ - data_blob_free(blob2); + data_blob_free(&blob2); return !cli_is_error(cli); } @@ -428,12 +429,12 @@ static BOOL cli_session_setup_ntlmssp(struct cli_state *cli, char *user, /* and wrap it in a SPNEGO wrapper */ msg1 = gen_negTokenTarg(mechs, blob); - data_blob_free(blob); + data_blob_free(&blob); /* now send that blob on its way */ blob = cli_session_setup_blob(cli, msg1); - data_blob_free(msg1); + data_blob_free(&msg1); if (!NT_STATUS_EQUAL(cli_nt_error(cli), NT_STATUS_MORE_PROCESSING_REQUIRED)) { return False; @@ -445,18 +446,25 @@ static BOOL cli_session_setup_ntlmssp(struct cli_state *cli, char *user, /* the server gives us back two challenges */ if (!spnego_parse_challenge(blob, &chal1, &chal2)) { + DEBUG(3,("Failed to parse challenges\n")); return False; } - data_blob_free(blob); + data_blob_free(&blob); /* encrypt the password with the challenge */ memcpy(challenge, chal1.data + 24, 8); SMBencrypt(pass, challenge,lmhash); SMBNTencrypt(pass, challenge,nthash); - data_blob_free(chal1); - data_blob_free(chal2); +#if 0 + file_save("nthash.dat", nthash, 24); + file_save("lmhash.dat", lmhash, 24); + file_save("chal1.dat", chal1.data, chal1.length); +#endif + + data_blob_free(&chal1); + data_blob_free(&chal2); /* this generates the actual auth packet */ msrpc_gen(&blob, "CdBBUUUBd", @@ -473,13 +481,13 @@ static BOOL cli_session_setup_ntlmssp(struct cli_state *cli, char *user, /* wrap it in SPNEGO */ auth = spnego_gen_auth(blob); - data_blob_free(blob); + data_blob_free(&blob); /* now send the auth packet and we should be done */ blob = cli_session_setup_blob(cli, auth); - data_blob_free(auth); - data_blob_free(blob); + data_blob_free(&auth); + data_blob_free(&blob); return !cli_is_error(cli); } diff --git a/source3/libsmb/clientgen.c b/source3/libsmb/clientgen.c index 25dc070024..ed0bc6481e 100644 --- a/source3/libsmb/clientgen.c +++ b/source3/libsmb/clientgen.c @@ -216,7 +216,7 @@ void cli_shutdown(struct cli_state *cli) SAFE_FREE(cli->outbuf); SAFE_FREE(cli->inbuf); - data_blob_free(cli->secblob); + data_blob_free(&cli->secblob); if (cli->mem_ctx) talloc_destroy(cli->mem_ctx); diff --git a/source3/libsmb/clispnego.c b/source3/libsmb/clispnego.c index da8c6450ae..78cae3315a 100644 --- a/source3/libsmb/clispnego.c +++ b/source3/libsmb/clispnego.c @@ -25,12 +25,13 @@ generate a negTokenInit packet given a GUID, a list of supported OIDs (the mechanisms) and a principle name string */ -ASN1_DATA spnego_gen_negTokenInit(uint8 guid[16], +DATA_BLOB spnego_gen_negTokenInit(uint8 guid[16], const char *OIDs[], const char *principle) { int i; ASN1_DATA data; + DATA_BLOB ret; memset(&data, 0, sizeof(data)); @@ -66,7 +67,10 @@ ASN1_DATA spnego_gen_negTokenInit(uint8 guid[16], asn1_free(&data); } - return data; + ret = data_blob(data.data, data.length); + asn1_free(&data); + + return ret; } @@ -166,6 +170,50 @@ DATA_BLOB gen_negTokenTarg(const char *OIDs[], DATA_BLOB blob) } +/* + 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 */ @@ -225,8 +273,8 @@ DATA_BLOB spnego_gen_negTokenTarg(struct cli_state *cli, char *principle) /* and wrap that in a shiny SPNEGO wrapper */ targ = gen_negTokenTarg(krb_mechs, tkt_wrapped); - data_blob_free(tkt_wrapped); - data_blob_free(tkt); + data_blob_free(&tkt_wrapped); + data_blob_free(&tkt); return targ; } @@ -257,13 +305,13 @@ BOOL spnego_parse_challenge(DATA_BLOB blob, asn1_end_tag(&data); asn1_start_tag(&data,ASN1_CONTEXT(2)); - asn1_read_octet_string(&data, chal1); + 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_octet_string(&data, chal2); + asn1_read_OctetString(&data, chal2); asn1_end_tag(&data); } @@ -275,6 +323,52 @@ BOOL spnego_parse_challenge(DATA_BLOB blob, 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 */ @@ -298,7 +392,32 @@ DATA_BLOB spnego_gen_auth(DATA_BLOB blob) 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; } @@ -312,6 +431,7 @@ DATA_BLOB spnego_gen_auth(DATA_BLOB blob) 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 */ @@ -339,6 +459,10 @@ BOOL msrpc_gen(DATA_BLOB *blob, 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; @@ -384,6 +508,12 @@ BOOL msrpc_gen(DATA_BLOB *blob, 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, @@ -395,3 +525,81 @@ BOOL msrpc_gen(DATA_BLOB *blob, 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; +} -- cgit