예제 #1
0
/*
  parse a krb5 GSS-API wrapper packet giving a ticket
*/
static bool gensec_gssapi_parse_krb5_wrap(TALLOC_CTX *mem_ctx, const DATA_BLOB *blob, DATA_BLOB *ticket, uint8_t tok_id[2])
{
    bool ret;
    struct asn1_data *data = asn1_init(mem_ctx);
    int data_remaining;

    if (!data) {
        return false;
    }

    asn1_load(data, *blob);
    asn1_start_tag(data, ASN1_APPLICATION(0));
    asn1_check_OID(data, GENSEC_OID_KERBEROS5);

    data_remaining = asn1_tag_remaining(data);

    if (data_remaining < 3) {
        data->has_error = true;
    } else {
        asn1_read(data, tok_id, 2);
        data_remaining -= 2;
        *ticket = data_blob_talloc(mem_ctx, NULL, data_remaining);
        asn1_read(data, ticket->data, ticket->length);
    }

    asn1_end_tag(data);

    ret = !data->has_error;

    asn1_free(data);

    return ret;
}
예제 #2
0
ssize_t read_spnego_data(DATA_BLOB data, SPNEGO_DATA *token)
{
	ASN1_DATA asn1;
	ssize_t ret = -1;

	ZERO_STRUCTP(token);
	ZERO_STRUCT(asn1);
	asn1_load(&asn1, data);

	switch (asn1.data[asn1.ofs]) {
	case ASN1_APPLICATION(0):
		asn1_start_tag(&asn1, ASN1_APPLICATION(0));
		asn1_check_OID(&asn1, OID_SPNEGO);
		if (read_negTokenInit(&asn1, &token->negTokenInit)) {
			token->type = SPNEGO_NEG_TOKEN_INIT;
		}
		asn1_end_tag(&asn1);
		break;
	case ASN1_CONTEXT(1):
		if (read_negTokenTarg(&asn1, &token->negTokenTarg)) {
			token->type = SPNEGO_NEG_TOKEN_TARG;
		}
		break;
	default:
		break;
	}

	if (!asn1.has_error) ret = asn1.ofs;
	asn1_free(&asn1);

	return ret;
}
예제 #3
0
파일: clispnego.c 프로젝트: hajuuk/R7000
/*
  parse a krb5 GSS-API wrapper packet giving a ticket
*/
BOOL spnego_parse_krb5_wrap(DATA_BLOB blob, DATA_BLOB *ticket, uint8 tok_id[2])
{
	BOOL ret;
	ASN1_DATA data;
	int data_remaining;

	asn1_load(&data, blob);
	asn1_start_tag(&data, ASN1_APPLICATION(0));
	asn1_check_OID(&data, OID_KERBEROS5);

	data_remaining = asn1_tag_remaining(&data);

	if (data_remaining < 3) {
		data.has_error = True;
	} else {
		asn1_read(&data, tok_id, 2);
		data_remaining -= 2;
		*ticket = data_blob(NULL, data_remaining);
		asn1_read(&data, ticket->data, ticket->length);
	}

	asn1_end_tag(&data);

	ret = !data.has_error;

	asn1_free(&data);

	return ret;
}
예제 #4
0
/*
  parse a spnego NTLMSSP challenge packet giving two security blobs
*/
bool spnego_parse_challenge(TALLOC_CTX *ctx, const DATA_BLOB blob,
			    DATA_BLOB *chal1, DATA_BLOB *chal2)
{
	bool ret = false;
	ASN1_DATA *data;

	ZERO_STRUCTP(chal1);
	ZERO_STRUCTP(chal2);

	data = asn1_init(talloc_tos());
	if (data == NULL) {
		return false;
	}

	if (!asn1_load(data, blob)) goto err;
	if (!asn1_start_tag(data,ASN1_CONTEXT(1))) goto err;
	if (!asn1_start_tag(data,ASN1_SEQUENCE(0))) goto err;

	if (!asn1_start_tag(data,ASN1_CONTEXT(0))) goto err;
	if (!asn1_check_enumerated(data,1)) goto err;
	if (!asn1_end_tag(data)) goto err;

	if (!asn1_start_tag(data,ASN1_CONTEXT(1))) goto err;
	if (!asn1_check_OID(data, OID_NTLMSSP)) goto err;
	if (!asn1_end_tag(data)) goto err;

	if (!asn1_start_tag(data,ASN1_CONTEXT(2))) goto err;
	if (!asn1_read_OctetString(data, ctx, chal1)) goto err;
	if (!asn1_end_tag(data)) goto err;

	/* the second challenge is optional (XP doesn't send it) */
	if (asn1_tag_remaining(data)) {
		if (!asn1_start_tag(data,ASN1_CONTEXT(3))) goto err;
		if (!asn1_read_OctetString(data, ctx, chal2)) goto err;
		if (!asn1_end_tag(data)) goto err;
	}

	if (!asn1_end_tag(data)) goto err;
	if (!asn1_end_tag(data)) goto err;

	ret = !asn1_has_error(data);

  err:

	if (asn1_has_error(data)) {
		data_blob_free(chal1);
		data_blob_free(chal2);
	}

	asn1_free(data);
	return ret;
}
예제 #5
0
파일: spnego_parse.c 프로젝트: gojdic/samba
ssize_t spnego_read_data(TALLOC_CTX *mem_ctx, DATA_BLOB data, struct spnego_data *token)
{
    struct asn1_data *asn1;
    ssize_t ret = -1;
    uint8_t context;

    ZERO_STRUCTP(token);

    if (data.length == 0) {
        return ret;
    }

    asn1 = asn1_init(mem_ctx);
    if (asn1 == NULL) {
        return -1;
    }

    asn1_load(asn1, data);

    if (!asn1_peek_uint8(asn1, &context)) {
        asn1->has_error = true;
    } else {
        switch (context) {
        case ASN1_APPLICATION(0):
            asn1_start_tag(asn1, ASN1_APPLICATION(0));
            asn1_check_OID(asn1, GENSEC_OID_SPNEGO);
            if (read_negTokenInit(asn1, mem_ctx, &token->negTokenInit)) {
                token->type = SPNEGO_NEG_TOKEN_INIT;
            }
            asn1_end_tag(asn1);
            break;
        case ASN1_CONTEXT(1):
            if (read_negTokenTarg(asn1, mem_ctx, &token->negTokenTarg)) {
                token->type = SPNEGO_NEG_TOKEN_TARG;
            }
            break;
        default:
            asn1->has_error = true;
            break;
        }
    }

    if (!asn1->has_error) ret = asn1->ofs;
    asn1_free(asn1);

    return ret;
}
/*
  magic check a GSS-API wrapper packet for an Kerberos OID
*/
static bool gensec_gssapi_check_oid(const DATA_BLOB *blob, const char *oid)
{
	bool ret;
	struct asn1_data *data = asn1_init(NULL);

	if (!data) return false;

	asn1_load(data, *blob);
	asn1_start_tag(data, ASN1_APPLICATION(0));
	asn1_check_OID(data, oid);

	ret = !data->has_error;

	asn1_free(data);

	return ret;
}
예제 #7
0
파일: clispnego.c 프로젝트: hajuuk/R7000
/*
 parse a SPNEGO NTLMSSP auth packet. This contains the encrypted passwords
*/
BOOL spnego_parse_auth_response(DATA_BLOB blob, NTSTATUS nt_status, 
				DATA_BLOB *auth)
{
	ASN1_DATA data;
	uint8 negResult;

	if (NT_STATUS_IS_OK(nt_status)) {
		negResult = SPNEGO_NEG_RESULT_ACCEPT;
	} else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
		negResult = SPNEGO_NEG_RESULT_INCOMPLETE;
	} else {
		negResult = SPNEGO_NEG_RESULT_REJECT;
	}

	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, negResult);
	asn1_end_tag(&data);

	if (negResult == SPNEGO_NEG_RESULT_INCOMPLETE) {
		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, auth);
		asn1_end_tag(&data);
	}

	asn1_end_tag(&data);
	asn1_end_tag(&data);

	if (data.has_error) {
		DEBUG(3,("spnego_parse_auth_response failed at %d\n", (int)data.ofs));
		asn1_free(&data);
		data_blob_free(auth);
		return False;
	}

	asn1_free(&data);
	return True;
}
예제 #8
0
파일: clispnego.c 프로젝트: hajuuk/R7000
/*
  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,
			       char *OIDs[ASN1_MAX_OIDS], 
			       char **principal)
{
	int i;
	BOOL ret;
	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_str = NULL;
		asn1_read_OID(&data,&oid_str);
		OIDs[i] = oid_str;
	}
	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;
}
예제 #9
0
파일: clispnego.c 프로젝트: hajuuk/R7000
/*
  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_str = NULL;
		asn1_read_OID(&data,&oid_str);
		OIDs[i] = oid_str;
	}
	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;
}
예제 #10
0
파일: clispnego.c 프로젝트: hajuuk/R7000
/*
  parse a spnego NTLMSSP challenge packet giving two security blobs
*/
BOOL spnego_parse_challenge(const 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;
}
예제 #11
0
/*
  parse a krb5 GSS-API wrapper packet giving a ticket
*/
bool spnego_parse_krb5_wrap(TALLOC_CTX *ctx, DATA_BLOB blob, DATA_BLOB *ticket, uint8 tok_id[2])
{
    bool ret;
    ASN1_DATA *data;
    int data_remaining;

    data = asn1_init(talloc_tos());
    if (data == NULL) {
        return false;
    }

    asn1_load(data, blob);
    asn1_start_tag(data, ASN1_APPLICATION(0));
    asn1_check_OID(data, OID_KERBEROS5);

    data_remaining = asn1_tag_remaining(data);

    if (data_remaining < 3) {
        data->has_error = True;
    } else {
        asn1_read(data, tok_id, 2);
        data_remaining -= 2;
        *ticket = data_blob_talloc(ctx, NULL, data_remaining);
        asn1_read(data, ticket->data, ticket->length);
    }

    asn1_end_tag(data);

    ret = !data->has_error;

    if (data->has_error) {
        data_blob_free(ticket);
    }

    asn1_free(data);

    return ret;
}
예제 #12
0
/*
  parse a negTokenInit packet giving a GUID, a list of supported
  OIDs (the mechanisms) and a principal name string
*/
bool spnego_parse_negTokenInit(TALLOC_CTX *ctx,
                               DATA_BLOB blob,
                               char *OIDs[ASN1_MAX_OIDS],
                               char **principal,
                               DATA_BLOB *secblob)
{
    int i;
    bool ret;
    ASN1_DATA *data;

    data = asn1_init(talloc_tos());
    if (data == NULL) {
        return false;
    }

    asn1_load(data, blob);

    asn1_start_tag(data,ASN1_APPLICATION(0));

    asn1_check_OID(data,OID_SPNEGO);

    /* negTokenInit  [0]  NegTokenInit */
    asn1_start_tag(data,ASN1_CONTEXT(0));
    asn1_start_tag(data,ASN1_SEQUENCE(0));

    /* mechTypes [0] MechTypeList  OPTIONAL */

    /* Not really optional, we depend on this to decide
     * what mechanisms we have to work with. */

    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-1; i++) {
        asn1_read_OID(data,ctx, &OIDs[i]);
        if (data->has_error) {
            break;
        }
    }
    OIDs[i] = NULL;
    asn1_end_tag(data);
    asn1_end_tag(data);

    if (principal) {
        *principal = NULL;
    }
    if (secblob) {
        *secblob = data_blob_null;
    }

    /*
      Win7 + Live Sign-in Assistant attaches a mechToken
      ASN1_CONTEXT(2) to the negTokenInit packet
      which breaks our negotiation if we just assume
      the next tag is ASN1_CONTEXT(3).
    */

    if (asn1_peek_tag(data, ASN1_CONTEXT(1))) {
        uint8 flags;

        /* reqFlags [1] ContextFlags  OPTIONAL */
        asn1_start_tag(data, ASN1_CONTEXT(1));
        asn1_start_tag(data, ASN1_BIT_STRING);
        while (asn1_tag_remaining(data) > 0) {
            asn1_read_uint8(data, &flags);
        }
        asn1_end_tag(data);
        asn1_end_tag(data);
    }

    if (asn1_peek_tag(data, ASN1_CONTEXT(2))) {
        DATA_BLOB sblob = data_blob_null;
        /* mechToken [2] OCTET STRING  OPTIONAL */
        asn1_start_tag(data, ASN1_CONTEXT(2));
        asn1_read_OctetString(data, ctx, &sblob);
        asn1_end_tag(data);
        if (secblob) {
            *secblob = sblob;
        } else {
            data_blob_free(&sblob);
        }
    }

    if (asn1_peek_tag(data, ASN1_CONTEXT(3))) {
        char *princ = NULL;
        /* mechListMIC [3] OCTET STRING  OPTIONAL */
        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, ctx, &princ);
        asn1_end_tag(data);
        asn1_end_tag(data);
        asn1_end_tag(data);
        if (principal) {
            *principal = princ;
        } else {
            TALLOC_FREE(princ);
        }
    }

    asn1_end_tag(data);
    asn1_end_tag(data);

    asn1_end_tag(data);

    ret = !data->has_error;
    if (data->has_error) {
        int j;
        if (principal) {
            TALLOC_FREE(*principal);
        }
        if (secblob) {
            data_blob_free(secblob);
        }
        for(j = 0; j < i && j < ASN1_MAX_OIDS-1; j++) {
            TALLOC_FREE(OIDs[j]);
        }
    }

    asn1_free(data);
    return ret;
}
예제 #13
0
/*
 parse a SPNEGO auth packet. This contains the encrypted passwords
*/
bool spnego_parse_auth_response(TALLOC_CTX *ctx,
                                DATA_BLOB blob, NTSTATUS nt_status,
                                const char *mechOID,
                                DATA_BLOB *auth)
{
    ASN1_DATA *data;
    uint8 negResult;

    if (NT_STATUS_IS_OK(nt_status)) {
        negResult = SPNEGO_ACCEPT_COMPLETED;
    } else if (NT_STATUS_EQUAL(nt_status, NT_STATUS_MORE_PROCESSING_REQUIRED)) {
        negResult = SPNEGO_ACCEPT_INCOMPLETE;
    } else {
        negResult = SPNEGO_REJECT;
    }

    data = asn1_init(talloc_tos());
    if (data == NULL) {
        return false;
    }

    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, negResult);
    asn1_end_tag(data);

    *auth = data_blob_null;

    if (asn1_tag_remaining(data)) {
        asn1_start_tag(data,ASN1_CONTEXT(1));
        asn1_check_OID(data, mechOID);
        asn1_end_tag(data);

        if (asn1_tag_remaining(data)) {
            asn1_start_tag(data,ASN1_CONTEXT(2));
            asn1_read_OctetString(data, ctx, auth);
            asn1_end_tag(data);
        }
    } else if (negResult == SPNEGO_ACCEPT_INCOMPLETE) {
        data->has_error = 1;
    }

    /* Binding against Win2K DC returns a duplicate of the responseToken in
     * the optional mechListMIC field. This is a bug in Win2K. We ignore
     * this field if it exists. Win2K8 may return a proper mechListMIC at
     * which point we need to implement the integrity checking. */
    if (asn1_tag_remaining(data)) {
        DATA_BLOB mechList = data_blob_null;
        asn1_start_tag(data, ASN1_CONTEXT(3));
        asn1_read_OctetString(data, ctx, &mechList);
        asn1_end_tag(data);
        data_blob_free(&mechList);
        DEBUG(5,("spnego_parse_auth_response received mechListMIC, "
                 "ignoring.\n"));
    }

    asn1_end_tag(data);
    asn1_end_tag(data);

    if (data->has_error) {
        DEBUG(3,("spnego_parse_auth_response failed at %d\n", (int)data->ofs));
        asn1_free(data);
        data_blob_free(auth);
        return False;
    }

    asn1_free(data);
    return True;
}