/* * We only support those mechanisms that we know about (ie ones that we know * how to check local user kuserok and the like) */ static int userauth_gssapi(Authctxt *authctxt) { gss_OID_desc goid = {0, NULL}; Gssctxt *ctxt = NULL; int mechs; int present; OM_uint32 ms; u_int len; u_char *doid = NULL; if (!authctxt->valid || authctxt->user == NULL) return (0); mechs = packet_get_int(); if (mechs == 0) { debug("Mechanism negotiation is not supported"); return (0); } do { mechs--; free(doid); present = 0; doid = packet_get_string(&len); if (len > 2 && doid[0] == SSH_GSS_OIDTYPE && doid[1] == len - 2) { goid.elements = doid + 2; goid.length = len - 2; ssh_gssapi_test_oid_supported(&ms, &goid, &present); } else { logit("Badly formed OID received"); } } while (mechs > 0 && !present); if (!present) { free(doid); authctxt->server_caused_failure = 1; return (0); } if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt, &goid)))) { if (ctxt != NULL) ssh_gssapi_delete_ctx(&ctxt); free(doid); authctxt->server_caused_failure = 1; return (0); } authctxt->methoddata = (void *)ctxt; packet_start(SSH2_MSG_USERAUTH_GSSAPI_RESPONSE); /* Return the OID that we received */ packet_put_string(doid, len); packet_send(); free(doid); dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); dispatch_set(SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); authctxt->postponed = 1; return (0); }
/* * We only support those mechanisms that we know about (ie ones that we know * how to check local user kuserok and the like) */ static int userauth_gssapi(struct ssh *ssh) { Authctxt *authctxt = ssh->authctxt; gss_OID_desc goid = {0, NULL}; Gssctxt *ctxt = NULL; int r, present; u_int mechs; OM_uint32 ms; size_t len; u_char *doid = NULL; if ((r = sshpkt_get_u32(ssh, &mechs)) != 0) fatal("%s: %s", __func__, ssh_err(r)); if (mechs == 0) { debug("Mechanism negotiation is not supported"); return (0); } do { mechs--; free(doid); present = 0; if ((r = sshpkt_get_string(ssh, &doid, &len)) != 0) fatal("%s: %s", __func__, ssh_err(r)); if (len > 2 && doid[0] == SSH_GSS_OIDTYPE && doid[1] == len - 2) { goid.elements = doid + 2; goid.length = len - 2; ssh_gssapi_test_oid_supported(&ms, &goid, &present); } else { logit("Badly formed OID received"); } } while (mechs > 0 && !present); if (!present) { free(doid); authctxt->server_caused_failure = 1; return (0); } if (!authctxt->valid || authctxt->user == NULL) { debug2("%s: disabled because of invalid user", __func__); free(doid); return (0); } if (GSS_ERROR(PRIVSEP(ssh_gssapi_server_ctx(&ctxt, &goid)))) { if (ctxt != NULL) ssh_gssapi_delete_ctx(&ctxt); free(doid); authctxt->server_caused_failure = 1; return (0); } authctxt->methoddata = (void *)ctxt; /* Return the OID that we received */ if ((r = sshpkt_start(ssh, SSH2_MSG_USERAUTH_GSSAPI_RESPONSE)) != 0 || (r = sshpkt_put_string(ssh, doid, len)) != 0 || (r = sshpkt_send(ssh)) != 0) fatal("%s: %s", __func__, ssh_err(r)); free(doid); ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_TOKEN, &input_gssapi_token); ssh_dispatch_set(ssh, SSH2_MSG_USERAUTH_GSSAPI_ERRTOK, &input_gssapi_errtok); authctxt->postponed = 1; return (0); }