| 1 | //go:build linux |
| 2 | |
| 3 | package home |
| 4 | |
| 5 | import ( |
| 6 | "bytes" |
| 7 | "context" |
| 8 | "crypto/sha256" |
| 9 | "database/sql" |
| 10 | "embed" |
| 11 | "encoding/hex" |
| 12 | "encoding/json" |
| 13 | "strings" |
| 14 | |
| 15 | "amadan.net/oficina/home/internal/operator" |
| 16 | ) |
| 17 | |
| 18 | // Admission is deliberately unmounted until verified platform enrollment exists. |
| 19 | // These manifests commit exact bytes; diagnostic observations cannot select one. |
| 20 | // |
| 21 | //go:embed admission_profiles/*.json |
| 22 | var admissionProfiles embed.FS |
| 23 | |
| 24 | type schemaCommitmentMigration struct { |
| 25 | ID string `json:"id"` |
| 26 | Checksum string `json:"checksum"` |
| 27 | } |
| 28 | type schemaCommitmentManifest struct { |
| 29 | Version int `json:"version"` |
| 30 | ID string `json:"id"` |
| 31 | Role string `json:"role"` |
| 32 | ValidationPolicy int `json:"validation_policy"` |
| 33 | Migrations []schemaCommitmentMigration `json:"migrations"` |
| 34 | Objects []schemaObject `json:"objects"` |
| 35 | EmptyTables []string `json:"empty_tables"` |
| 36 | } |
| 37 | |
| 38 | type schemaCommitment struct { |
| 39 | manifest schemaCommitmentManifest |
| 40 | digest string |
| 41 | } |
| 42 | |
| 43 | func decodeSchemaCommitment(raw []byte) (schemaCommitmentManifest, error) { |
| 44 | var m schemaCommitmentManifest |
| 45 | if len(raw) == 0 || len(raw) > 1<<20 { |
| 46 | return m, operator.ErrRefused |
| 47 | } |
| 48 | d := json.NewDecoder(bytes.NewReader(raw)) |
| 49 | d.DisallowUnknownFields() |
| 50 | if d.Decode(&m) != nil { |
| 51 | return m, operator.ErrRefused |
| 52 | } |
| 53 | canonical, err := json.MarshalIndent(m, "", " ") |
| 54 | if err != nil || !bytes.Equal(append(canonical, '\n'), raw) || m.Version != 1 || m.ValidationPolicy != 1 || |
| 55 | len(m.Migrations) == 0 || len(m.Migrations) > 1000 || len(m.Objects) == 0 || len(m.Objects) > 1000 || m.EmptyTables == nil { |
| 56 | return m, operator.ErrRefused |
| 57 | } |
| 58 | switch m.ID { |
| 59 | case "credential-current-v1": |
| 60 | if m.Role != "credential" || len(m.EmptyTables) != 0 { |
| 61 | return m, operator.ErrRefused |
| 62 | } |
| 63 | case "directory-current-v1": |
| 64 | if m.Role != "directory" || len(m.EmptyTables) != 0 { |
| 65 | return m, operator.ErrRefused |
| 66 | } |
| 67 | case "directory-historical-empty-v1": |
| 68 | if m.Role != "directory" || strings.Join(m.EmptyTables, ",") != "passkey_challenges,passkey_credentials,passkey_pending,passkey_recovery_codes,people,signin_links" { |
| 69 | return m, operator.ErrRefused |
| 70 | } |
| 71 | default: |
| 72 | return m, operator.ErrRefused |
| 73 | } |
| 74 | for i, migration := range m.Migrations { |
| 75 | sum, err := hex.DecodeString(migration.Checksum) |
| 76 | if migration.ID == "" || len(migration.ID) > 256 || err != nil || len(sum) != 32 || hex.EncodeToString(sum) != migration.Checksum || |
| 77 | (i > 0 && m.Migrations[i-1].ID >= migration.ID) { |
| 78 | return m, operator.ErrRefused |
| 79 | } |
| 80 | } |
| 81 | tables := map[string]bool{} |
| 82 | for i, obj := range m.Objects { |
| 83 | if obj.Type != "table" && obj.Type != "index" && obj.Type != "trigger" && obj.Type != "view" { |
| 84 | return m, operator.ErrRefused |
| 85 | } |
| 86 | if obj.Name == "" || obj.Table == "" || len(obj.Name) > 256 || len(obj.Table) > 256 || len(obj.SQL) > 65536 { |
| 87 | return m, operator.ErrRefused |
| 88 | } |
| 89 | if i > 0 { |
| 90 | prior := m.Objects[i-1] |
| 91 | if prior.Type > obj.Type || (prior.Type == obj.Type && prior.Name >= obj.Name) { |
| 92 | return m, operator.ErrRefused |
| 93 | } |
| 94 | } |
| 95 | if obj.Type == "table" { |
| 96 | tables[obj.Name] = true |
| 97 | } |
| 98 | } |
| 99 | for _, table := range m.EmptyTables { |
| 100 | if !tables[table] { |
| 101 | return m, operator.ErrRefused |
| 102 | } |
| 103 | } |
| 104 | return m, nil |
| 105 | } |
| 106 | |
| 107 | func loadSchemaCommitment(role, id, digest string) (schemaCommitment, error) { |
| 108 | var result schemaCommitment |
| 109 | switch id { |
| 110 | case "credential-current-v1", "directory-current-v1", "directory-historical-empty-v1": |
| 111 | default: |
| 112 | return result, operator.ErrRefused |
| 113 | } |
| 114 | raw, err := admissionProfiles.ReadFile("admission_profiles/" + id + ".json") |
| 115 | if err != nil { |
| 116 | return result, operator.ErrUnavailable |
| 117 | } |
| 118 | sum := sha256.Sum256(raw) |
| 119 | if hex.EncodeToString(sum[:]) != digest { |
| 120 | return result, operator.ErrRefused |
| 121 | } |
| 122 | manifest, err := decodeSchemaCommitment(raw) |
| 123 | if err != nil || manifest.Role != role || manifest.ID != id { |
| 124 | return result, operator.ErrRefused |
| 125 | } |
| 126 | return schemaCommitment{manifest: manifest, digest: digest}, nil |
| 127 | } |
| 128 | |
| 129 | // Caller must hold the same transaction through schema checking and any later |
| 130 | // operation. Stage A supplies no transaction, database opener or production caller. |
| 131 | func checkSchemaCommitment(ctx context.Context, conn *sql.Conn, selected schemaCommitment) error { |
| 132 | if ctx == nil || conn == nil { |
| 133 | return operator.ErrRefused |
| 134 | } |
| 135 | pinned, err := loadSchemaCommitment(selected.manifest.Role, selected.manifest.ID, selected.digest) |
| 136 | if err != nil { |
| 137 | return err |
| 138 | } |
| 139 | m := pinned.manifest |
| 140 | expected := map[string]string{} |
| 141 | for _, migration := range m.Migrations { |
| 142 | expected[migration.ID] = migration.Checksum |
| 143 | } |
| 144 | rows, err := conn.QueryContext(ctx, `SELECT |
| 145 | CASE WHEN typeof(id)='text' AND length(CAST(id AS BLOB))<=256 THEN id END, |
| 146 | CASE WHEN typeof(checksum)='text' AND length(CAST(checksum AS BLOB))=64 THEN checksum END |
| 147 | FROM rastrillo_migrations LIMIT 1001`) |
| 148 | if err != nil { |
| 149 | return operator.ErrRefused |
| 150 | } |
| 151 | matched, count := true, 0 |
| 152 | for rows.Next() { |
| 153 | count++ |
| 154 | var id, checksum sql.NullString |
| 155 | if rows.Scan(&id, &checksum) != nil { |
| 156 | rows.Close() |
| 157 | return operator.ErrRefused |
| 158 | } |
| 159 | if !id.Valid || !checksum.Valid || count > 1000 || expected[id.String] != checksum.String { |
| 160 | matched = false |
| 161 | } |
| 162 | delete(expected, id.String) |
| 163 | } |
| 164 | scanErr, closeErr := rows.Err(), rows.Close() |
| 165 | if scanErr != nil || closeErr != nil || ctx.Err() != nil || !matched || len(expected) != 0 { |
| 166 | return operator.ErrRefused |
| 167 | } |
| 168 | objects := map[string]schemaObject{} |
| 169 | for _, obj := range m.Objects { |
| 170 | objects[obj.Type+"/"+obj.Name] = obj |
| 171 | } |
| 172 | rows, err = conn.QueryContext(ctx, `SELECT |
| 173 | CASE WHEN typeof(type)='text' AND length(CAST(type AS BLOB))<=16 THEN type END, |
| 174 | CASE WHEN typeof(name)='text' AND length(CAST(name AS BLOB))<=256 THEN name END, |
| 175 | CASE WHEN typeof(tbl_name)='text' AND length(CAST(tbl_name AS BLOB))<=256 THEN tbl_name END, |
| 176 | CASE WHEN typeof(coalesce(sql,''))='text' AND length(CAST(coalesce(sql,'') AS BLOB))<=65536 THEN coalesce(sql,'') END |
| 177 | FROM sqlite_schema LIMIT 1001`) |
| 178 | if err != nil { |
| 179 | return operator.ErrRefused |
| 180 | } |
| 181 | count = 0 |
| 182 | for rows.Next() { |
| 183 | count++ |
| 184 | var kind, name, table, statement sql.NullString |
| 185 | if rows.Scan(&kind, &name, &table, &statement) != nil { |
| 186 | rows.Close() |
| 187 | return operator.ErrRefused |
| 188 | } |
| 189 | obj := schemaObject{kind.String, name.String, table.String, statement.String} |
| 190 | key := kind.String + "/" + name.String |
| 191 | prior, exists := objects[key] |
| 192 | if !kind.Valid || !name.Valid || !table.Valid || !statement.Valid || count > 1000 || !exists || prior != obj { |
| 193 | matched = false |
| 194 | } |
| 195 | delete(objects, key) |
| 196 | } |
| 197 | scanErr, closeErr = rows.Err(), rows.Close() |
| 198 | if scanErr != nil || closeErr != nil || ctx.Err() != nil || !matched || len(objects) != 0 { |
| 199 | return operator.ErrRefused |
| 200 | } |
| 201 | total := 0 |
| 202 | for _, obj := range m.Objects { |
| 203 | if obj.Type != "table" { |
| 204 | continue |
| 205 | } |
| 206 | var count int |
| 207 | query := `SELECT count(*) FROM (SELECT 1 FROM "` + strings.ReplaceAll(obj.Name, `"`, `""`) + `" LIMIT 100001)` |
| 208 | if conn.QueryRowContext(ctx, query).Scan(&count) != nil { |
| 209 | return operator.ErrRefused |
| 210 | } |
| 211 | total += count |
| 212 | if total > 100000 { |
| 213 | return operator.ErrUnavailable |
| 214 | } |
| 215 | } |
| 216 | for _, table := range m.EmptyTables { |
| 217 | var occupied bool |
| 218 | if conn.QueryRowContext(ctx, `SELECT EXISTS(SELECT 1 FROM "`+table+`")`).Scan(&occupied) != nil || occupied { |
| 219 | return operator.ErrRefused |
| 220 | } |
| 221 | } |
| 222 | rows, err = conn.QueryContext(ctx, "PRAGMA foreign_key_check") |
| 223 | if err != nil { |
| 224 | return operator.ErrRefused |
| 225 | } |
| 226 | bad := rows.Next() |
| 227 | scanErr, closeErr = rows.Err(), rows.Close() |
| 228 | if bad || scanErr != nil || closeErr != nil { |
| 229 | return operator.ErrRefused |
| 230 | } |
| 231 | var n int |
| 232 | if conn.QueryRowContext(ctx, "SELECT count(*) FROM (SELECT 1 FROM _litestream_lock LIMIT 1)").Scan(&n) != nil || n != 0 { |
| 233 | return operator.ErrRefused |
| 234 | } |
| 235 | if conn.QueryRowContext(ctx, "SELECT count(*) FROM (SELECT 1 FROM _litestream_seq LIMIT 2)").Scan(&n) != nil || n > 1 { |
| 236 | return operator.ErrRefused |
| 237 | } |
| 238 | if n == 1 { |
| 239 | var valid int |
| 240 | if conn.QueryRowContext(ctx, "SELECT typeof(id)='integer' AND id=1 AND typeof(seq)='integer' AND seq>=1 FROM _litestream_seq").Scan(&valid) != nil || valid != 1 { |
| 241 | return operator.ErrRefused |
| 242 | } |
| 243 | } |
| 244 | if ctx.Err() != nil { |
| 245 | return operator.ErrRefused |
| 246 | } |
| 247 | return nil |
| 248 | } |
| 249 | |
amadan