/
GroupValidator.java
468 lines (381 loc) · 23.7 KB
/
GroupValidator.java
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/*
* Copyright 2020 Signal Messenger, LLC
* SPDX-License-Identifier: AGPL-3.0-only
*/
package org.signal.storageservice.groups;
import static com.codahale.metrics.MetricRegistry.name;
import com.google.protobuf.ByteString;
import io.micrometer.core.instrument.Metrics;
import java.security.MessageDigest;
import java.time.Clock;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;
import java.util.stream.Stream;
import javax.ws.rs.BadRequestException;
import javax.ws.rs.ForbiddenException;
import org.apache.commons.codec.binary.Base64;
import org.signal.libsignal.zkgroup.InvalidInputException;
import org.signal.libsignal.zkgroup.VerificationFailedException;
import org.signal.libsignal.zkgroup.groups.GroupPublicParams;
import org.signal.libsignal.zkgroup.profiles.ProfileKeyCredentialPresentation;
import org.signal.libsignal.zkgroup.profiles.ServerZkProfileOperations;
import org.signal.storageservice.auth.GroupUser;
import org.signal.storageservice.configuration.GroupConfiguration;
import org.signal.storageservice.controllers.GroupsController;
import org.signal.storageservice.storage.protos.groups.AccessControl;
import org.signal.storageservice.storage.protos.groups.Group;
import org.signal.storageservice.storage.protos.groups.GroupChange;
import org.signal.storageservice.storage.protos.groups.GroupChange.Actions.ModifyMemberProfileKeyAction;
import org.signal.storageservice.storage.protos.groups.GroupChange.Actions.PromoteMemberPendingPniAciProfileKeyAction;
import org.signal.storageservice.storage.protos.groups.GroupChange.Actions.PromoteMemberPendingProfileKeyAction;
import org.signal.storageservice.storage.protos.groups.Member;
import org.signal.storageservice.storage.protos.groups.MemberBanned;
import org.signal.storageservice.storage.protos.groups.MemberPendingAdminApproval;
import org.signal.storageservice.storage.protos.groups.MemberPendingProfileKey;
import org.signal.storageservice.util.CollectionUtil;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class GroupValidator {
private static final int INVITE_LINK_PASSWORD_SIZE_BYTES = 16;
private static final String CREDENTIALS_VERSION_COUNTER_NAME = name(GroupValidator.class,
"profileKeyCredentialsVersion");
private final Logger logger = LoggerFactory.getLogger(GroupsController.class);
private final ServerZkProfileOperations profileOperations;
private final int maxGroupSize;
private final int maxGroupTitleLengthBytes;
private final int maxGroupDescriptionLengthBytes;
public GroupValidator(ServerZkProfileOperations profileOperations, GroupConfiguration groupConfiguration) {
this.profileOperations = profileOperations;
this.maxGroupSize = groupConfiguration.getMaxGroupSize();
this.maxGroupTitleLengthBytes = groupConfiguration.getMaxGroupTitleLengthBytes();
this.maxGroupDescriptionLengthBytes = groupConfiguration.getMaxGroupDescriptionLengthBytes();
}
public Member validateMember(Group group, Member member) throws BadRequestException {
try {
if (member.getRole() == Member.Role.UNRECOGNIZED ||
member.getRole() == Member.Role.UNKNOWN) {
throw new BadRequestException("Unknown member role");
}
if (member.getPresentation().isEmpty()) {
throw new BadRequestException("Missing presentation");
}
GroupPublicParams publicParams = new GroupPublicParams(group.getPublicKey().toByteArray());
ProfileKeyCredentialPresentation profileKeyCredentialPresentation = new ProfileKeyCredentialPresentation(member.getPresentation().toByteArray());
Metrics.counter(CREDENTIALS_VERSION_COUNTER_NAME,
"version", profileKeyCredentialPresentation.getVersion().toString())
.increment();
profileOperations.verifyProfileKeyCredentialPresentation(publicParams, profileKeyCredentialPresentation);
return member.toBuilder()
.clearPresentation()
.setProfileKey(ByteString.copyFrom(profileKeyCredentialPresentation.getProfileKeyCiphertext().serialize()))
.setUserId(ByteString.copyFrom(profileKeyCredentialPresentation.getUuidCiphertext().serialize()))
.setJoinedAtVersion(group.getVersion())
.build();
} catch (InvalidInputException | VerificationFailedException e) {
logger.info("Member validation", e);
throw new BadRequestException(e);
}
}
public MemberPendingProfileKey validateMemberPendingProfileKey(Clock clock, Member addedBy, Group group, MemberPendingProfileKey memberPendingProfileKey)
throws BadRequestException {
if (!memberPendingProfileKey.hasMember() || memberPendingProfileKey.getMember() == null) {
throw new BadRequestException("Missing member");
}
if (memberPendingProfileKey.getMember().getUserId() == null || memberPendingProfileKey.getMember().getUserId().isEmpty()) {
throw new BadRequestException("Missing member user id");
}
if (memberPendingProfileKey.getMember().getRole() == Member.Role.UNKNOWN || memberPendingProfileKey.getMember().getRole() == Member.Role.UNRECOGNIZED) {
throw new BadRequestException("Unknown member role");
}
if (memberPendingProfileKey.getMember().getPresentation() != null && !memberPendingProfileKey.getMember().getPresentation().isEmpty()) {
throw new BadRequestException("There's a presentation for a pending member");
}
if (memberPendingProfileKey.getMember().getProfileKey() != null && !memberPendingProfileKey.getMember().getProfileKey().isEmpty()) {
throw new BadRequestException("There's a profile key for a pending member");
}
Member.Builder memberPendingProfileKeyData = memberPendingProfileKey.getMember().toBuilder();
memberPendingProfileKeyData.setJoinedAtVersion(group.getVersion());
memberPendingProfileKeyData.clearPresentation();
memberPendingProfileKeyData.clearProfileKey();
return MemberPendingProfileKey.newBuilder()
.setMember(memberPendingProfileKeyData)
.setAddedByUserId(addedBy.getUserId())
.setTimestamp(clock.millis())
.build();
}
public MemberPendingAdminApproval validateMemberPendingAdminApproval(Clock clock, GroupUser user, Group group, MemberPendingAdminApproval memberPendingAdminApproval) throws BadRequestException {
try {
if (!memberPendingAdminApproval.getUserId().isEmpty()) {
throw new BadRequestException("user id should not be set in request");
}
if (!memberPendingAdminApproval.getProfileKey().isEmpty()) {
throw new BadRequestException("profile key should not be set in request");
}
if (memberPendingAdminApproval.getPresentation().isEmpty()) {
throw new BadRequestException("missing presentation in request");
}
if (memberPendingAdminApproval.getTimestamp() != 0L) {
throw new BadRequestException("timestamp should not be set in request");
}
GroupPublicParams publicParams = new GroupPublicParams(group.getPublicKey().toByteArray());
ProfileKeyCredentialPresentation profileKeyCredentialPresentation = new ProfileKeyCredentialPresentation(memberPendingAdminApproval.getPresentation().toByteArray());
profileOperations.verifyProfileKeyCredentialPresentation(publicParams, profileKeyCredentialPresentation);
if (!user.isMember(ByteString.copyFrom(profileKeyCredentialPresentation.getUuidCiphertext().serialize()), group.getPublicKey())) {
throw new BadRequestException("cannot add others to a group using an invite link");
}
return MemberPendingAdminApproval.newBuilder()
.setProfileKey(ByteString.copyFrom(profileKeyCredentialPresentation.getProfileKeyCiphertext().serialize()))
.setUserId(ByteString.copyFrom(profileKeyCredentialPresentation.getUuidCiphertext().serialize()))
.setTimestamp(clock.millis())
.build();
} catch (VerificationFailedException | InvalidInputException e) {
throw new BadRequestException("invalid presentation", e);
}
}
public MemberBanned validateMemberBanned(Clock clock, GroupUser addedBy, Group group, MemberBanned memberBanned) throws BadRequestException {
if (memberBanned.getUserId().isEmpty()) {
throw new BadRequestException("missing user id");
}
return MemberBanned.newBuilder()
.setUserId(memberBanned.getUserId())
.setTimestamp(clock.millis())
.build();
}
public List<GroupChange.Actions.AddMemberAction> validateAddMember(GroupUser user, byte[] inviteLinkPassword, Group group, List<GroupChange.Actions.AddMemberAction> actions) throws BadRequestException {
List<GroupChange.Actions.AddMemberAction> validatedActions = new LinkedList<>();
for (GroupChange.Actions.AddMemberAction action : actions) {
if (!action.hasAdded() || action.getAdded().getPresentation() == null || action.getAdded().getPresentation().isEmpty()) {
throw new BadRequestException("Bad member construction");
}
if (action.getJoinFromInviteLink()) {
throw new BadRequestException("Invalid field set on action");
}
final GroupChange.Actions.AddMemberAction.Builder builder = action.toBuilder().setAdded(validateMember(group, action.getAdded()));
if (!GroupAuth.isMember(user, group)
&& user.isMember(builder.getAdded().getUserId(), group.getPublicKey())
&& group.getAccessControl().getMembers() != AccessControl.AccessRequired.ANY
&& group.getAccessControl().getAddFromInviteLink() == AccessControl.AccessRequired.ANY
&& MessageDigest.isEqual(group.getInviteLinkPassword().toByteArray(), inviteLinkPassword)) {
builder.setJoinFromInviteLink(true);
}
validatedActions.add(builder.build());
}
return validatedActions;
}
public List<GroupChange.Actions.AddMemberPendingProfileKeyAction> validateAddMembersPendingProfileKey(Clock clock, GroupUser addedByUser, Group group, List<GroupChange.Actions.AddMemberPendingProfileKeyAction> actions)
throws BadRequestException, ForbiddenException {
if (actions.isEmpty()) {
return actions;
}
Member addedBy = GroupAuth.getMember(addedByUser, group).orElseThrow(ForbiddenException::new);
List<GroupChange.Actions.AddMemberPendingProfileKeyAction> validatedActions = new LinkedList<>();
for (GroupChange.Actions.AddMemberPendingProfileKeyAction action : actions) {
if (!action.hasAdded() || !action.getAdded().hasMember()) {
throw new BadRequestException("Bad member construction");
}
validatedActions.add(action.toBuilder().setAdded(validateMemberPendingProfileKey(clock, addedBy, group, action.getAdded())).build());
}
return validatedActions;
}
public List<GroupChange.Actions.AddMemberPendingAdminApprovalAction> validateAddMembersPendingAdminApproval(Clock clock, GroupUser user, byte[] inviteLinkPassword, Group group, List<GroupChange.Actions.AddMemberPendingAdminApprovalAction> actions) {
if (actions.isEmpty()) {
return actions;
}
if (!MessageDigest.isEqual(inviteLinkPassword, group.getInviteLinkPassword().toByteArray())) {
throw new ForbiddenException();
}
List<GroupChange.Actions.AddMemberPendingAdminApprovalAction> validatedActions = new ArrayList<>(actions.size());
for (GroupChange.Actions.AddMemberPendingAdminApprovalAction action : actions) {
if (!action.hasAdded()) {
throw new BadRequestException("missing added field in add members pending admin approval actions");
}
validatedActions.add(GroupChange.Actions.AddMemberPendingAdminApprovalAction.newBuilder()
.setAdded(validateMemberPendingAdminApproval(clock, user, group, action.getAdded()))
.build());
}
return validatedActions;
}
public List<GroupChange.Actions.AddMemberBannedAction> validateAddMembersBanned(Clock clock, GroupUser addedByUser, Group group, List<GroupChange.Actions.AddMemberBannedAction> actions) {
if (actions.isEmpty()) {
return actions;
}
Member addedBy = GroupAuth.getMember(addedByUser, group).orElseThrow(ForbiddenException::new);
List<GroupChange.Actions.AddMemberBannedAction> validatedActions = new LinkedList<>();
for (GroupChange.Actions.AddMemberBannedAction action : actions) {
if (!action.hasAdded()) {
throw new BadRequestException("missing added field in add members banned actions");
}
validatedActions.add(GroupChange.Actions.AddMemberBannedAction.newBuilder().setAdded(
validateMemberBanned(clock, addedByUser, group, action.getAdded())).build());
}
return validatedActions;
}
public List<ModifyMemberProfileKeyAction> validateModifyMemberProfileKeys(GroupUser user, Group group, List<ModifyMemberProfileKeyAction> actions) {
if (actions.stream().anyMatch(action -> !action.getProfileKey().isEmpty() || !action.getUserId().isEmpty())) {
throw new BadRequestException("Profile Key and User ID may not be set on request");
}
List<ModifyMemberProfileKeyAction> validatedActions = actions.stream().map(action -> {
ProfileKeyCredentialPresentation presentation = validateProfileKeyCredentialPresentationUpdate(user, group, action.getPresentation());
return ModifyMemberProfileKeyAction.newBuilder()
.setUserId(ByteString.copyFrom(presentation.getUuidCiphertext().serialize()))
.setProfileKey(ByteString.copyFrom(presentation.getProfileKeyCiphertext().serialize()))
.setPresentation(ByteString.copyFrom(presentation.getStructurallyValidV1PresentationBytes()))
// TODO: some time after clients stop reading the presentation, stop setting it here
.build();
}).collect(Collectors.toList());
if (CollectionUtil.containsDuplicates(validatedActions.stream().map(ModifyMemberProfileKeyAction::getUserId))) {
throw new BadRequestException("Duplicate User ID");
}
return validatedActions;
}
public List<PromoteMemberPendingProfileKeyAction> validatePromoteMembersPendingProfileKey(GroupUser user, Group group, List<PromoteMemberPendingProfileKeyAction> actions) {
if (actions.stream().anyMatch(action -> !action.getProfileKey().isEmpty() || !action.getUserId().isEmpty())) {
throw new BadRequestException("Profile Key and User ID may not be set on request");
}
List<PromoteMemberPendingProfileKeyAction> validatedActions = actions.stream().map(action -> {
ProfileKeyCredentialPresentation presentation = validateProfileKeyCredentialPresentationUpdate(user, group, action.getPresentation());
return PromoteMemberPendingProfileKeyAction.newBuilder()
.setUserId(ByteString.copyFrom(presentation.getUuidCiphertext().serialize()))
.setProfileKey(ByteString.copyFrom(presentation.getProfileKeyCiphertext().serialize()))
.setPresentation(ByteString.copyFrom(presentation.getStructurallyValidV1PresentationBytes()))
// TODO: some time after clients stop reading the presentation, stop setting it here
.build();
}).collect(Collectors.toList());
if (CollectionUtil.containsDuplicates(validatedActions.stream().map(PromoteMemberPendingProfileKeyAction::getUserId))) {
throw new BadRequestException("Duplicate User ID");
}
return validatedActions;
}
public List<PromoteMemberPendingPniAciProfileKeyAction> validatePromoteMemberPendingPniAciProfileKey(GroupUser user, Group group, List<PromoteMemberPendingPniAciProfileKeyAction> actions) {
if (actions.stream().anyMatch(action -> !action.getProfileKey().isEmpty() || !action.getUserId().isEmpty() || !action.getPni().isEmpty())) {
throw new BadRequestException("Profile Key, User ID, and PNI may not be set on request");
}
final List<PromoteMemberPendingPniAciProfileKeyAction> validatedActions = actions.stream().map(action -> {
final ProfileKeyCredentialPresentation presentation = validateProfileKeyCredentialPresentationUpdate(user, group, action.getPresentation());
return PromoteMemberPendingPniAciProfileKeyAction.newBuilder()
.setUserId(ByteString.copyFrom(presentation.getUuidCiphertext().serialize()))
.setPni(user.getPniCiphertext().orElseThrow(() -> new ForbiddenException("PNI not specified")))
.setProfileKey(ByteString.copyFrom(presentation.getProfileKeyCiphertext().serialize()))
.clearPresentation()
.build();
}).collect(Collectors.toList());
if (CollectionUtil.containsDuplicates(Stream.concat(
validatedActions.stream().map(PromoteMemberPendingPniAciProfileKeyAction::getUserId),
validatedActions.stream().map(PromoteMemberPendingPniAciProfileKeyAction::getPni)))) {
throw new BadRequestException("Duplicate user id");
}
return validatedActions;
}
private ProfileKeyCredentialPresentation validateProfileKeyCredentialPresentationUpdate(GroupUser source, Group group,
ByteString presentationData) throws BadRequestException, ForbiddenException {
try {
GroupPublicParams publicParams = new GroupPublicParams(group.getPublicKey().toByteArray());
if (presentationData == null || presentationData.isEmpty()) {
throw new BadRequestException();
}
ProfileKeyCredentialPresentation presentation = new ProfileKeyCredentialPresentation(presentationData.toByteArray());
if (!source.isMember(ByteString.copyFrom(presentation.getUuidCiphertext().serialize()), group.getPublicKey())) {
throw new ForbiddenException();
}
profileOperations.verifyProfileKeyCredentialPresentation(publicParams, presentation);
return presentation;
} catch (InvalidInputException | VerificationFailedException e) {
throw new BadRequestException(e);
}
}
public boolean isValidAvatarUrl(String url, ByteString groupId) {
if (url == null || url.isEmpty()) return true;
if (!url.startsWith("groups/" + Base64.encodeBase64URLSafeString(groupId.toByteArray()) + "/")) {
return false;
}
String[] parts = url.split("[/]");
if (parts.length != 3) {
return false;
}
byte[] object = Base64.decodeBase64(parts[2]);
return object.length == 16;
}
public boolean isPendingAdminApprovalFull(Group group) {
return group.getMembersPendingAdminApprovalCount() >= maxGroupSize;
}
public void validateFinalGroupState(Group group) throws BadRequestException {
if (group.getTitle().isEmpty()) {
throw new BadRequestException("group title must be non-empty");
}
if (group.getTitle().size() > maxGroupTitleLengthBytes) {
throw new BadRequestException("group title length exceeded");
}
if (group.getDescription().size() > maxGroupDescriptionLengthBytes) {
throw new BadRequestException("group description length exceeded");
}
if (!group.getInviteLinkPassword().isEmpty() && group.getInviteLinkPassword().size() != INVITE_LINK_PASSWORD_SIZE_BYTES) {
throw new BadRequestException("group invite link password cannot be set to invalid size");
}
if (group.getInviteLinkPassword().isEmpty() &&
group.getAccessControl().getAddFromInviteLink() != AccessControl.AccessRequired.UNSATISFIABLE &&
group.getAccessControl().getAddFromInviteLink() != AccessControl.AccessRequired.UNKNOWN) {
throw new BadRequestException("group cannot permit joining with no password");
}
// the admin approval pending list was purposefully left out of this computation
if (group.getMembersCount() + group.getMembersPendingProfileKeyCount() > maxGroupSize) {
throw new BadRequestException("group size cannot exceed " + maxGroupSize);
}
// put some sort of cap on the maximum number of accounts that can be pending admin review
if (group.getMembersPendingAdminApprovalCount() > maxGroupSize) {
throw new BadRequestException("members pending admin approval cannot exceed " + maxGroupSize);
}
// put some sort of cap on the maximum number of accounts that can be banned
if (group.getMembersBannedCount() > maxGroupSize) {
throw new BadRequestException("members banned cannot exceed " + maxGroupSize);
}
Set<ByteString> membersUserIds = group.getMembersList().stream().map(Member::getUserId).collect(Collectors.toUnmodifiableSet());
Set<ByteString> membersPendingProfileKeyUserIds = group.getMembersPendingProfileKeyList().stream().map(member -> member.getMember().getUserId()).collect(Collectors.toUnmodifiableSet());
Set<ByteString> membersPendingAdminApprovalUserIds = group.getMembersPendingAdminApprovalList().stream().map(MemberPendingAdminApproval::getUserId).collect(Collectors.toUnmodifiableSet());
Set<ByteString> membersBannedUserIds = group.getMembersBannedList().stream().map(MemberBanned::getUserId).collect(Collectors.toUnmodifiableSet());
if (membersUserIds.size() != group.getMembersCount() ||
membersPendingProfileKeyUserIds.size() != group.getMembersPendingProfileKeyCount() ||
membersPendingAdminApprovalUserIds.size() != group.getMembersPendingAdminApprovalCount() ||
membersBannedUserIds.size() != group.getMembersBannedCount()) {
throw new BadRequestException("group cannot contain duplicate user ids in the membership lists");
}
Set<ByteString> allUserIds =
Stream.of(membersUserIds, membersPendingProfileKeyUserIds, membersPendingAdminApprovalUserIds, membersBannedUserIds)
.flatMap(Set::stream)
.collect(Collectors.toUnmodifiableSet());
// if size of a unique set from all doesn't match the sum of the four then there's some duplication going on across lists
if (allUserIds.size() != membersUserIds.size() + membersPendingProfileKeyUserIds.size() + membersPendingAdminApprovalUserIds.size() + membersBannedUserIds.size()) {
throw new BadRequestException("group cannot contain the same user in multiple membership lists");
}
validateAccessControl(group);
validateRoles(group);
}
private void validateAccessControl(Group group) throws BadRequestException {
final AccessControl accessControl = group.getAccessControl();
if (!GroupAuth.isAccessRequiredOneOf(accessControl.getAttributes(), AccessControl.AccessRequired.UNKNOWN, AccessControl.AccessRequired.ADMINISTRATOR, AccessControl.AccessRequired.MEMBER)) {
throw new BadRequestException("attribute access invalid");
}
if (!GroupAuth.isAccessRequiredOneOf(accessControl.getMembers(), AccessControl.AccessRequired.UNKNOWN, AccessControl.AccessRequired.ADMINISTRATOR, AccessControl.AccessRequired.MEMBER)) {
throw new BadRequestException("members access invalid");
}
if (!GroupAuth.isAccessRequiredOneOf(accessControl.getAddFromInviteLink(), AccessControl.AccessRequired.UNKNOWN, AccessControl.AccessRequired.ANY, AccessControl.AccessRequired.ADMINISTRATOR, AccessControl.AccessRequired.UNSATISFIABLE)) {
throw new BadRequestException("add from invite link access invalid");
}
}
private void validateRoles(Group group) throws BadRequestException {
for (Member member : group.getMembersList()) {
final Member.Role role = member.getRole();
if (role != Member.Role.DEFAULT && role != Member.Role.ADMINISTRATOR) {
throw new BadRequestException("invalid member role");
}
}
for (MemberPendingProfileKey member : group.getMembersPendingProfileKeyList()) {
final Member.Role role = member.getMember().getRole();
if (role != Member.Role.DEFAULT && role != Member.Role.ADMINISTRATOR) {
throw new BadRequestException("invalid member pending profile key role");
}
}
}
}