| 1 | package docs |
| 2 | |
| 3 | import ( |
| 4 | "context" |
| 5 | "errors" |
| 6 | "net/http" |
| 7 | |
| 8 | "amadan.net/oficina/home/roster" |
| 9 | "amadan.net/rastrillo/rastrillo" |
| 10 | "gorm.io/gorm" |
| 11 | ) |
| 12 | |
| 13 | type accessContextKey struct{} |
| 14 | type requestAccess struct { |
| 15 | uncertain bool |
| 16 | responseStore *Store |
| 17 | responseDocs map[int64]permission |
| 18 | runtime *teamRuntime |
| 19 | actor Actor |
| 20 | subject string |
| 21 | decision roster.Decision |
| 22 | } |
| 23 | type permission uint8 |
| 24 | |
| 25 | const ( |
| 26 | permissionRead permission = iota |
| 27 | permissionWrite |
| 28 | permissionOwner |
| 29 | ) |
| 30 | |
| 31 | var errTeamNotMember = errors.New("docs: team membership required") |
| 32 | |
| 33 | func sameActor(a, b Actor) bool { |
| 34 | if a.PersonID != b.PersonID || (a.VerifiedAddress == nil) != (b.VerifiedAddress == nil) { |
| 35 | return false |
| 36 | } |
| 37 | return a.VerifiedAddress == nil || *a.VerifiedAddress == *b.VerifiedAddress |
| 38 | } |
| 39 | func (a *requestAccess) state() roster.State { |
| 40 | if a == nil { |
| 41 | return roster.Unknown |
| 42 | } |
| 43 | if a.uncertain { |
| 44 | return roster.Unknown |
| 45 | } |
| 46 | if a.decision.State == roster.Member && !a.decision.Lease.Valid() { |
| 47 | a.uncertain = true |
| 48 | return roster.Unknown |
| 49 | } |
| 50 | return a.decision.State |
| 51 | } |
| 52 | func (s *Store) access(ctx context.Context, actor Actor) (*requestAccess, bool) { |
| 53 | a, ok := ctx.Value(accessContextKey{}).(*requestAccess) |
| 54 | return a, ok && a != nil && a.runtime == s.team && sameActor(a.actor, actor) |
| 55 | } |
| 56 | func (t *teamRuntime) resolveAccess(ctx context.Context, id requestIdentity) *requestAccess { |
| 57 | a := &requestAccess{runtime: t, actor: id.Actor, subject: id.HomeSubject, decision: roster.Decision{State: roster.NotMember}} |
| 58 | if id.HomeSubject != "" { |
| 59 | a.decision = t.cache.Check(ctx, t.bindings.Issuer, t.bindings.Team, id.HomeSubject) |
| 60 | } |
| 61 | return a |
| 62 | } |
| 63 | func (t *teamRuntime) admission(next http.Handler) http.Handler { |
| 64 | return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 65 | id, ok := currentIdentity(r) |
| 66 | if !ok { |
| 67 | http.Error(w, rastrillo.T(r, "docs.error.generic"), http.StatusServiceUnavailable) |
| 68 | return |
| 69 | } |
| 70 | a := t.resolveAccess(r.Context(), id) |
| 71 | next.ServeHTTP(w, r.WithContext(context.WithValue(r.Context(), accessContextKey{}, a))) |
| 72 | }) |
| 73 | } |
| 74 | |
| 75 | // permissionScope is also usable under the SQLite writer. It never refreshes |
| 76 | // the roster, and checks a lease without waiting for a cache publisher. |
| 77 | func (s *Store) permissionScope(ctx context.Context, g *gorm.DB, actor Actor, p permission) *gorm.DB { |
| 78 | owner := s.team == nil |
| 79 | if s.team != nil { |
| 80 | a, ok := s.access(ctx, actor) |
| 81 | if !ok { |
| 82 | return g.Where("1 = 0") |
| 83 | } |
| 84 | owner = a.state() == roster.Member |
| 85 | } |
| 86 | if actor.PersonID <= 0 { |
| 87 | return g.Where("1 = 0") |
| 88 | } |
| 89 | if p == permissionOwner { |
| 90 | if !owner { |
| 91 | return g.Where("1 = 0") |
| 92 | } |
| 93 | return owned(g, actor.PersonID) |
| 94 | } |
| 95 | grant := actor.VerifiedAddress != nil && *actor.VerifiedAddress != "" |
| 96 | if !owner && !grant { |
| 97 | return g.Where("1 = 0") |
| 98 | } |
| 99 | clause := "documents.owner_id > 0 AND (" |
| 100 | args := []any{} |
| 101 | if owner { |
| 102 | clause += "documents.owner_id = ?" |
| 103 | args = append(args, actor.PersonID) |
| 104 | } |
| 105 | if grant { |
| 106 | if owner { |
| 107 | clause += " OR " |
| 108 | } |
| 109 | clause += "EXISTS (SELECT 1 FROM grants WHERE grants.doc_id = documents.id AND grants.subject = ?" |
| 110 | args = append(args, subjectOf(*actor.VerifiedAddress)) |
| 111 | if p == permissionWrite { |
| 112 | clause += " AND grants.role = ?" |
| 113 | args = append(args, RoleWriter) |
| 114 | } |
| 115 | clause += ")" |
| 116 | } |
| 117 | return g.Where(clause+")", args...) |
| 118 | } |
| 119 | func (s *Store) permissionError(ctx context.Context, actor Actor, err error) error { |
| 120 | if s.team == nil || err == nil { |
| 121 | return err |
| 122 | } |
| 123 | if !errors.Is(err, gorm.ErrRecordNotFound) { |
| 124 | return errTeamUnavailable |
| 125 | } |
| 126 | a, ok := s.access(ctx, actor) |
| 127 | if !ok || a.state() == roster.Unknown { |
| 128 | return errTeamUnavailable |
| 129 | } |
| 130 | return gorm.ErrRecordNotFound |
| 131 | } |
| 132 | func (s *Store) requireMember(ctx context.Context, actor Actor) error { |
| 133 | if s.team == nil { |
| 134 | return nil |
| 135 | } |
| 136 | a, ok := s.access(ctx, actor) |
| 137 | if !ok { |
| 138 | return errTeamUnavailable |
| 139 | } |
| 140 | switch a.state() { |
| 141 | case roster.Member: |
| 142 | return nil |
| 143 | case roster.NotMember: |
| 144 | return errTeamNotMember |
| 145 | default: |
| 146 | return errTeamUnavailable |
| 147 | } |
| 148 | } |
| 149 | |
| 150 | func (s *Store) ownerActor(ctx context.Context, owner int64) Actor { |
| 151 | if s.team == nil { |
| 152 | return Actor{PersonID: owner} |
| 153 | } |
| 154 | a, ok := ctx.Value(accessContextKey{}).(*requestAccess) |
| 155 | if !ok || a == nil || a.actor.PersonID != owner { |
| 156 | return Actor{PersonID: owner} |
| 157 | } |
| 158 | return a.actor |
| 159 | } |
| 160 | |
| 161 | func (s *Store) checkPermission(ctx context.Context, db *gorm.DB, actor Actor, docID int64, p permission) error { |
| 162 | var doc Document |
| 163 | err := s.permissionScope(ctx, db, actor, p).Where("documents.id = ? AND documents.deleted_at IS NULL", docID).First(&doc).Error |
| 164 | err = s.permissionError(ctx, actor, err) |
| 165 | if p == permissionWrite && errors.Is(err, gorm.ErrRecordNotFound) { |
| 166 | return ErrNotWritable |
| 167 | } |
| 168 | return err |
| 169 | } |
| 170 | func (s *Store) snapshotPermission(ctx context.Context, db *gorm.DB, docID int64) error { |
| 171 | if s.team == nil { |
| 172 | return nil |
| 173 | } |
| 174 | a, ok := ctx.Value(accessContextKey{}).(*requestAccess) |
| 175 | if !ok || a == nil { |
| 176 | return errTeamUnavailable |
| 177 | } |
| 178 | return s.checkPermission(ctx, db, a.actor, docID, permissionWrite) |
| 179 | } |
| 180 | |
| 181 | func (s *Store) ownerMutation(ctx context.Context, owner, docID int64, mutate func(*gorm.DB) error) error { |
| 182 | actor := s.ownerActor(ctx, owner) |
| 183 | return s.db.WithContext(ctx).Transaction(func(tx *gorm.DB) error { |
| 184 | if err := s.checkPermission(ctx, tx, actor, docID, permissionOwner); err != nil { |
| 185 | return err |
| 186 | } |
| 187 | if err := mutate(tx); err != nil { |
| 188 | return s.permissionError(ctx, actor, err) |
| 189 | } |
| 190 | return s.checkPermission(ctx, tx, actor, docID, permissionOwner) |
| 191 | }) |
| 192 | } |
| 193 | |
| 194 | func (h *handlers) internalFailureStatus() int { |
| 195 | if h.store.team != nil { |
| 196 | return http.StatusServiceUnavailable |
| 197 | } |
| 198 | return http.StatusInternalServerError |
| 199 | } |
| 200 | func (h *handlers) requireMemberRequest(w http.ResponseWriter, r *http.Request, item bool) bool { |
| 201 | if h.store.team == nil { |
| 202 | if h.member(r) { |
| 203 | return true |
| 204 | } |
| 205 | h.fail(w, r, http.StatusForbidden, failStatus) |
| 206 | return false |
| 207 | } |
| 208 | actor, e := h.actor(r) |
| 209 | if e == nil { |
| 210 | e = h.store.requireMember(r.Context(), actor) |
| 211 | } |
| 212 | if e == nil { |
| 213 | return true |
| 214 | } |
| 215 | code, kind := http.StatusServiceUnavailable, failStatus |
| 216 | if errors.Is(e, errTeamNotMember) { |
| 217 | code = http.StatusForbidden |
| 218 | if item { |
| 219 | code, kind = http.StatusNotFound, failDocument |
| 220 | } |
| 221 | } |
| 222 | h.fail(w, r, code, kind) |
| 223 | return false |
| 224 | } |
| 225 | |
| 226 | func (h *handlers) partialCatalog(r *http.Request) string { |
| 227 | if h.store.team == nil { |
| 228 | return "" |
| 229 | } |
| 230 | a, ok := r.Context().Value(accessContextKey{}).(*requestAccess) |
| 231 | if !ok || a == nil || a.runtime != h.store.team || a.state() == roster.Unknown { |
| 232 | return rastrillo.T(r, "docs.team.partial") |
| 233 | } |
| 234 | return "" |
| 235 | } |
| 236 | |
| 237 | // The account group contains only local reauthentication and explicit linking. |
| 238 | // A known addressless Home account must be able to start that local gesture. |
| 239 | func requireTeamAccountAdmission(list allowlist) func(http.Handler) http.Handler { |
| 240 | return func(next http.Handler) http.Handler { |
| 241 | local := requireAdmission(list, "/signin/local")(next) |
| 242 | return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) { |
| 243 | id, ok := currentIdentity(r) |
| 244 | if ok && id.Actor.VerifiedAddress == nil && id.Session.Method == homeAssertionMethod { |
| 245 | next.ServeHTTP(w, r) |
| 246 | return |
| 247 | } |
| 248 | local.ServeHTTP(w, r) |
| 249 | }) |
| 250 | } |
| 251 | } |
| 252 | |
amadan