- /* Acquire our credentials */
- maj_stat = gss_acquire_cred(&min_stat,
- gserver, /* desired name */
- 0, /* time */
- GSS_C_NULL_OID_SET, /* desired mechs */
- GSS_C_ACCEPT, /* cred usage */
- &gcred, /* handle */
- NULL /* actual mechs */,
- NULL /* time rec */);
- if (GSS_ERROR(maj_stat))
- return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat,
- "gss_acquire_cred(%s)", ex_server_str);
-
- maj_stat = gss_release_name(&min_stat, &gserver);
-
- HDEBUG(D_auth) debug_printf("heimdal: have server credentials.\n");
-
- /* Loop talking to client */
- step = 0;
- from_client = initial_data;
- handled_empty_ir = FALSE;
- error_out = OK;
-
- /* buffer sizes: auth_get_data() uses big_buffer, which we grow per
- GSSAPI RFC in _init, if needed, to meet the SHOULD size of 64KB.
- (big_buffer starts life at the MUST size of 16KB). */
-
- /* step values
- 0: getting initial data from client to feed into GSSAPI
- 1: iterating for as long as GSS_S_CONTINUE_NEEDED
- 2: GSS_S_COMPLETE, SASL wrapping for authz and qop to send to client
- 3: unpick final auth message from client
- 4: break/finish (non-step)
- */
- while (step < 4) {
- switch (step) {
- case 0:
- if (!from_client || *from_client == '\0') {
- if (handled_empty_ir) {
- HDEBUG(D_auth) debug_printf("gssapi: repeated empty input, grr.\n");
- error_out = BAD64;
- goto ERROR_OUT;
- } else {
- HDEBUG(D_auth) debug_printf("gssapi: missing initial response, nudging.\n");
- error_out = auth_get_data(&from_client, US"", 0);
- if (error_out != OK)
- goto ERROR_OUT;
- handled_empty_ir = TRUE;
- continue;
- }
- }
- /* We should now have the opening data from the client, base64-encoded. */
- step += 1;
- HDEBUG(D_auth) debug_printf("heimdal: have initial client data\n");
- break;
-
- case 1:
- gbufdesc_in.length = b64decode(from_client, USS &gbufdesc_in.value);
- if (gclient) {
- maj_stat = gss_release_name(&min_stat, &gclient);
- gclient = GSS_C_NO_NAME;
- }
- maj_stat = gss_accept_sec_context(&min_stat,
- &gcontext, /* context handle */
- gcred, /* acceptor cred handle */
- &gbufdesc_in, /* input from client */
- GSS_C_NO_CHANNEL_BINDINGS, /* XXX fixme: use the channel bindings from GnuTLS */
- &gclient, /* client identifier */
- &mech_type, /* mechanism in use */
- &gbufdesc_out, /* output to send to client */
- NULL, /* return flags */
- NULL, /* time rec */
- NULL /* delegated cred_handle */
- );
- if (GSS_ERROR(maj_stat)) {
- exim_gssapi_error_defer(NULL, maj_stat, min_stat,
- "gss_accept_sec_context()");
- error_out = FAIL;
- goto ERROR_OUT;
- }
- if (&gbufdesc_out.length != 0) {
- error_out = auth_get_data(&from_client,
- gbufdesc_out.value, gbufdesc_out.length);
- if (error_out != OK)
- goto ERROR_OUT;
-
- gss_release_buffer(&min_stat, &gbufdesc_out);
- EmptyBuf(gbufdesc_out);
- }
- if (maj_stat == GSS_S_COMPLETE) {
- step += 1;
- HDEBUG(D_auth) debug_printf("heimdal: GSS complete\n");
- } else {
- HDEBUG(D_auth) debug_printf("heimdal: need more data\n");
- }
- break;
-
- case 2:
- memset(sasl_config, 0xFF, 4);
- /* draft-ietf-sasl-gssapi-06.txt defines bitmasks for first octet
- 0x01 No security layer
- 0x02 Integrity protection
- 0x04 Confidentiality protection
-
- The remaining three octets are the maximum buffer size for wrapped
- content. */
- sasl_config[0] = 0x01; /* Exim does not wrap/unwrap SASL layers after auth */
- gbufdesc.value = (void *) sasl_config;
- gbufdesc.length = 4;
- maj_stat = gss_wrap(&min_stat,
- gcontext,
- 0, /* conf_req_flag: integrity only */
- GSS_C_QOP_DEFAULT, /* qop requested */
- &gbufdesc, /* message to protect */
- NULL, /* conf_state: no confidentiality applied */
- &gbufdesc_out /* output buffer */
- );
- if (GSS_ERROR(maj_stat)) {
- exim_gssapi_error_defer(NULL, maj_stat, min_stat,
- "gss_wrap(SASL state after auth)");
- error_out = FAIL;
- goto ERROR_OUT;
- }
-
- HDEBUG(D_auth) debug_printf("heimdal SASL: requesting QOP with no security layers\n");
-
- error_out = auth_get_data(&from_client,
- gbufdesc_out.value, gbufdesc_out.length);
- if (error_out != OK)
- goto ERROR_OUT;
-
- gss_release_buffer(&min_stat, &gbufdesc_out);
- EmptyBuf(gbufdesc_out);
- step += 1;
- break;
-
- case 3:
- gbufdesc_in.length = b64decode(from_client, USS &gbufdesc_in.value);
- maj_stat = gss_unwrap(&min_stat,
- gcontext,
- &gbufdesc_in, /* data from client */
- &gbufdesc_out, /* results */
- NULL, /* conf state */
- NULL /* qop state */
- );
- if (GSS_ERROR(maj_stat)) {
- exim_gssapi_error_defer(NULL, maj_stat, min_stat,
- "gss_unwrap(final SASL message from client)");
- error_out = FAIL;
- goto ERROR_OUT;
- }
- if (gbufdesc_out.length < 4) {
- HDEBUG(D_auth)
- debug_printf("gssapi: final message too short; "
- "need flags, buf sizes and optional authzid\n");
- error_out = FAIL;
- goto ERROR_OUT;
- }
-
- requested_qop = (CS gbufdesc_out.value)[0];
- if ((requested_qop & 0x01) == 0) {
- HDEBUG(D_auth)
- debug_printf("gssapi: client requested security layers (%x)\n",
- (unsigned int) requested_qop);
- error_out = FAIL;
- goto ERROR_OUT;
- }
-
- for (i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL;
- expand_nmax = 0;
-
- /* Identifiers:
- The SASL provided identifier is an unverified authzid.
- GSSAPI provides us with a verified identifier, but it might be empty
- for some clients.
- */
-
- /* $auth2 is authzid requested at SASL layer */
- if (gbufdesc_out.length > 4) {
- expand_nlength[2] = gbufdesc_out.length - 4;
- auth_vars[1] = expand_nstring[2] =
- string_copyn((US gbufdesc_out.value) + 4, expand_nlength[2]);
- expand_nmax = 2;
- }
-
- gss_release_buffer(&min_stat, &gbufdesc_out);
- EmptyBuf(gbufdesc_out);
-
- /* $auth1 is GSSAPI display name */
- maj_stat = gss_display_name(&min_stat,
- gclient,
- &gbufdesc_out,
- &mech_type);
- if (GSS_ERROR(maj_stat)) {
- auth_vars[1] = expand_nstring[2] = NULL;
- expand_nmax = 0;
- exim_gssapi_error_defer(NULL, maj_stat, min_stat,
- "gss_display_name(client identifier)");
- error_out = FAIL;
- goto ERROR_OUT;
- }
-
- expand_nlength[1] = gbufdesc_out.length;
- auth_vars[0] = expand_nstring[1] =
- string_copyn(gbufdesc_out.value, gbufdesc_out.length);
-
- if (expand_nmax == 0) { /* should be: authzid was empty */
- expand_nmax = 2;
- expand_nlength[2] = expand_nlength[1];
- auth_vars[1] = expand_nstring[2] = string_copyn(expand_nstring[1], expand_nlength[1]);
- HDEBUG(D_auth)
- debug_printf("heimdal SASL: empty authzid, set to dup of GSSAPI display name\n");
- }
-
- HDEBUG(D_auth)
- debug_printf("heimdal SASL: happy with client request\n"
- " auth1 (verified GSSAPI display-name): \"%s\"\n"
- " auth2 (unverified SASL requested authzid): \"%s\"\n",
- auth_vars[0], auth_vars[1]);
-
- step += 1;
- break;
+/* Acquire our credentials */
+maj_stat = gss_acquire_cred(&min_stat,
+ gserver, /* desired name */
+ 0, /* time */
+ GSS_C_NULL_OID_SET, /* desired mechs */
+ GSS_C_ACCEPT, /* cred usage */
+ &gcred, /* handle */
+ NULL /* actual mechs */,
+ NULL /* time rec */);
+if (GSS_ERROR(maj_stat))
+ return exim_gssapi_error_defer(store_reset_point, maj_stat, min_stat,
+ "gss_acquire_cred(%s)", ex_server_str);
+
+maj_stat = gss_release_name(&min_stat, &gserver);
+
+HDEBUG(D_auth) debug_printf("heimdal: have server credentials.\n");
+
+/* Loop talking to client */
+step = 0;
+from_client = initial_data;
+handled_empty_ir = FALSE;
+error_out = OK;
+
+/* buffer sizes: auth_get_data() uses big_buffer, which we grow per
+GSSAPI RFC in _init, if needed, to meet the SHOULD size of 64KB.
+(big_buffer starts life at the MUST size of 16KB). */
+
+/* step values
+0: getting initial data from client to feed into GSSAPI
+1: iterating for as long as GSS_S_CONTINUE_NEEDED
+2: GSS_S_COMPLETE, SASL wrapping for authz and qop to send to client
+3: unpick final auth message from client
+4: break/finish (non-step)
+*/
+while (step < 4)
+ switch (step)
+ {
+ case 0:
+ if (!from_client || !*from_client)
+ {
+ if (handled_empty_ir)
+ {
+ HDEBUG(D_auth) debug_printf("gssapi: repeated empty input, grr.\n");
+ error_out = BAD64;
+ goto ERROR_OUT;
+ }
+
+ HDEBUG(D_auth) debug_printf("gssapi: missing initial response, nudging.\n");
+ error_out = auth_get_data(&from_client, US"", 0);
+ if (error_out != OK)
+ goto ERROR_OUT;
+ handled_empty_ir = TRUE;
+ continue;
+ }
+ /* We should now have the opening data from the client, base64-encoded. */
+ step += 1;
+ HDEBUG(D_auth) debug_printf("heimdal: have initial client data\n");
+ break;
+
+ case 1:
+ gbufdesc_in.length = b64decode(from_client, USS &gbufdesc_in.value);
+ if (gclient)
+ {
+ maj_stat = gss_release_name(&min_stat, &gclient);
+ gclient = GSS_C_NO_NAME;
+ }
+ maj_stat = gss_accept_sec_context(&min_stat,
+ &gcontext, /* context handle */
+ gcred, /* acceptor cred handle */
+ &gbufdesc_in, /* input from client */
+ GSS_C_NO_CHANNEL_BINDINGS, /* XXX fixme: use the channel bindings from GnuTLS */
+ &gclient, /* client identifier */
+ &mech_type, /* mechanism in use */
+ &gbufdesc_out, /* output to send to client */
+ NULL, /* return flags */
+ NULL, /* time rec */
+ NULL /* delegated cred_handle */
+ );
+ if (GSS_ERROR(maj_stat))
+ {
+ exim_gssapi_error_defer(NULL, maj_stat, min_stat,
+ "gss_accept_sec_context()");
+ error_out = FAIL;
+ goto ERROR_OUT;
+ }
+ if (gbufdesc_out.length != 0)
+ {
+ error_out = auth_get_data(&from_client,
+ gbufdesc_out.value, gbufdesc_out.length);
+ if (error_out != OK)
+ goto ERROR_OUT;
+
+ gss_release_buffer(&min_stat, &gbufdesc_out);
+ EmptyBuf(gbufdesc_out);
+ }
+ if (maj_stat == GSS_S_COMPLETE)
+ {
+ step += 1;
+ HDEBUG(D_auth) debug_printf("heimdal: GSS complete\n");
+ }
+ else
+ HDEBUG(D_auth) debug_printf("heimdal: need more data\n");
+ break;
+
+ case 2:
+ memset(sasl_config, 0xFF, 4);
+ /* draft-ietf-sasl-gssapi-06.txt defines bitmasks for first octet
+ 0x01 No security layer
+ 0x02 Integrity protection
+ 0x04 Confidentiality protection
+
+ The remaining three octets are the maximum buffer size for wrapped
+ content. */
+ sasl_config[0] = 0x01; /* Exim does not wrap/unwrap SASL layers after auth */
+ gbufdesc.value = (void *) sasl_config;
+ gbufdesc.length = 4;
+ maj_stat = gss_wrap(&min_stat,
+ gcontext,
+ 0, /* conf_req_flag: integrity only */
+ GSS_C_QOP_DEFAULT, /* qop requested */
+ &gbufdesc, /* message to protect */
+ NULL, /* conf_state: no confidentiality applied */
+ &gbufdesc_out /* output buffer */
+ );
+ if (GSS_ERROR(maj_stat))
+ {
+ exim_gssapi_error_defer(NULL, maj_stat, min_stat,
+ "gss_wrap(SASL state after auth)");
+ error_out = FAIL;
+ goto ERROR_OUT;
+ }
+
+ HDEBUG(D_auth) debug_printf("heimdal SASL: requesting QOP with no security layers\n");
+
+ error_out = auth_get_data(&from_client,
+ gbufdesc_out.value, gbufdesc_out.length);
+ if (error_out != OK)
+ goto ERROR_OUT;
+
+ gss_release_buffer(&min_stat, &gbufdesc_out);
+ EmptyBuf(gbufdesc_out);
+ step += 1;
+ break;
+
+ case 3:
+ gbufdesc_in.length = b64decode(from_client, USS &gbufdesc_in.value);
+ maj_stat = gss_unwrap(&min_stat,
+ gcontext,
+ &gbufdesc_in, /* data from client */
+ &gbufdesc_out, /* results */
+ NULL, /* conf state */
+ NULL /* qop state */
+ );
+ if (GSS_ERROR(maj_stat))
+ {
+ exim_gssapi_error_defer(NULL, maj_stat, min_stat,
+ "gss_unwrap(final SASL message from client)");
+ error_out = FAIL;
+ goto ERROR_OUT;
+ }
+ if (gbufdesc_out.length < 4)
+ {
+ HDEBUG(D_auth)
+ debug_printf("gssapi: final message too short; "
+ "need flags, buf sizes and optional authzid\n");
+ error_out = FAIL;
+ goto ERROR_OUT;
+ }
+
+ requested_qop = (CS gbufdesc_out.value)[0];
+ if (!(requested_qop & 0x01))
+ {
+ HDEBUG(D_auth)
+ debug_printf("gssapi: client requested security layers (%x)\n",
+ (unsigned int) requested_qop);
+ error_out = FAIL;
+ goto ERROR_OUT;
+ }
+
+ for (int i = 0; i < AUTH_VARS; i++) auth_vars[i] = NULL;
+ expand_nmax = 0;
+
+ /* Identifiers:
+ The SASL provided identifier is an unverified authzid.
+ GSSAPI provides us with a verified identifier, but it might be empty
+ for some clients.
+ */
+
+ /* $auth2 is authzid requested at SASL layer */
+ if (gbufdesc_out.length > 4)
+ {
+ expand_nlength[2] = gbufdesc_out.length - 4;
+ auth_vars[1] = expand_nstring[2] =
+ string_copyn((US gbufdesc_out.value) + 4, expand_nlength[2]);
+ expand_nmax = 2;
+ }
+
+ gss_release_buffer(&min_stat, &gbufdesc_out);
+ EmptyBuf(gbufdesc_out);
+
+ /* $auth1 is GSSAPI display name */
+ maj_stat = gss_display_name(&min_stat,
+ gclient, &gbufdesc_out, &mech_type);
+ if (GSS_ERROR(maj_stat))
+ {
+ auth_vars[1] = expand_nstring[2] = NULL;
+ expand_nmax = 0;
+ exim_gssapi_error_defer(NULL, maj_stat, min_stat,
+ "gss_display_name(client identifier)");
+ error_out = FAIL;
+ goto ERROR_OUT;
+ }
+
+ expand_nlength[1] = gbufdesc_out.length;
+ auth_vars[0] = expand_nstring[1] =
+ string_copyn(gbufdesc_out.value, gbufdesc_out.length);
+
+ if (expand_nmax == 0) /* should be: authzid was empty */
+ {
+ expand_nmax = 2;
+ expand_nlength[2] = expand_nlength[1];
+ auth_vars[1] = expand_nstring[2] = string_copyn(expand_nstring[1], expand_nlength[1]);
+ HDEBUG(D_auth)
+ debug_printf("heimdal SASL: empty authzid, set to dup of GSSAPI display name\n");
+ }
+
+ HDEBUG(D_auth)
+ debug_printf("heimdal SASL: happy with client request\n"
+ " auth1 (verified GSSAPI display-name): \"%s\"\n"
+ " auth2 (unverified SASL requested authzid): \"%s\"\n",
+ auth_vars[0], auth_vars[1]);
+
+ step += 1;
+ break;