|
| 1 | +package postgresql |
| 2 | + |
| 3 | +import ( |
| 4 | + "database/sql" |
| 5 | + "fmt" |
| 6 | + "log" |
| 7 | + "strings" |
| 8 | + |
| 9 | + "github.com/hashicorp/errwrap" |
| 10 | + "github.com/hashicorp/terraform/helper/schema" |
| 11 | + "github.com/hashicorp/terraform/helper/validation" |
| 12 | + |
| 13 | + // Use Postgres as SQL driver |
| 14 | + "github.com/lib/pq" |
| 15 | +) |
| 16 | + |
| 17 | +func resourcePostgreSQLDefaultPrivileges() *schema.Resource { |
| 18 | + return &schema.Resource{ |
| 19 | + Create: resourcePostgreSQLDefaultPrivilegesCreate, |
| 20 | + Update: resourcePostgreSQLDefaultPrivilegesCreate, |
| 21 | + Read: resourcePostgreSQLDefaultPrivilegesRead, |
| 22 | + Delete: resourcePostgreSQLDefaultPrivilegesDelete, |
| 23 | + |
| 24 | + Schema: map[string]*schema.Schema{ |
| 25 | + "role": { |
| 26 | + Type: schema.TypeString, |
| 27 | + Required: true, |
| 28 | + ForceNew: true, |
| 29 | + Description: "The name of the role to which grant default privileges on", |
| 30 | + }, |
| 31 | + "database": { |
| 32 | + Type: schema.TypeString, |
| 33 | + Required: true, |
| 34 | + ForceNew: true, |
| 35 | + Description: "The database to grant default privileges for this role", |
| 36 | + }, |
| 37 | + "owner": { |
| 38 | + Type: schema.TypeString, |
| 39 | + Required: true, |
| 40 | + ForceNew: true, |
| 41 | + Description: "Role for which apply default privileges (You can change default privileges only for objects that will be created by yourself or by roles that you are a member of)", |
| 42 | + }, |
| 43 | + "schema": { |
| 44 | + Type: schema.TypeString, |
| 45 | + Required: true, |
| 46 | + ForceNew: true, |
| 47 | + Description: "The database schema to set default privileges for this role", |
| 48 | + }, |
| 49 | + "object_type": { |
| 50 | + Type: schema.TypeString, |
| 51 | + Required: true, |
| 52 | + ForceNew: true, |
| 53 | + ValidateFunc: validation.StringInSlice([]string{ |
| 54 | + "table", |
| 55 | + "sequence", |
| 56 | + }, false), |
| 57 | + Description: "The PostgreSQL object type to set the default privileges on (one of: table, sequence)", |
| 58 | + }, |
| 59 | + "privileges": &schema.Schema{ |
| 60 | + Type: schema.TypeSet, |
| 61 | + Required: true, |
| 62 | + Elem: &schema.Schema{Type: schema.TypeString}, |
| 63 | + Set: schema.HashString, |
| 64 | + MinItems: 1, |
| 65 | + Description: "The list of privileges to apply as default privileges", |
| 66 | + }, |
| 67 | + }, |
| 68 | + } |
| 69 | +} |
| 70 | + |
| 71 | +func resourcePostgreSQLDefaultPrivilegesRead(d *schema.ResourceData, meta interface{}) error { |
| 72 | + client := meta.(*Client) |
| 73 | + |
| 74 | + client.catalogLock.RLock() |
| 75 | + defer client.catalogLock.RUnlock() |
| 76 | + |
| 77 | + exists, err := checkRoleDBSchemaExists(client, d) |
| 78 | + if err != nil { |
| 79 | + return err |
| 80 | + } |
| 81 | + if !exists { |
| 82 | + d.SetId("") |
| 83 | + return nil |
| 84 | + } |
| 85 | + |
| 86 | + txn, err := startTransaction(client, d.Get("database").(string)) |
| 87 | + if err != nil { |
| 88 | + return err |
| 89 | + } |
| 90 | + defer deferredRollback(txn) |
| 91 | + |
| 92 | + return readRoleDefaultPrivileges(txn, d) |
| 93 | +} |
| 94 | + |
| 95 | +func resourcePostgreSQLDefaultPrivilegesCreate(d *schema.ResourceData, meta interface{}) error { |
| 96 | + if err := validatePrivileges(d.Get("object_type").(string), d.Get("privileges").(*schema.Set).List()); err != nil { |
| 97 | + return err |
| 98 | + } |
| 99 | + |
| 100 | + database := d.Get("database").(string) |
| 101 | + |
| 102 | + client := meta.(*Client) |
| 103 | + |
| 104 | + client.catalogLock.Lock() |
| 105 | + defer client.catalogLock.Unlock() |
| 106 | + |
| 107 | + txn, err := startTransaction(client, database) |
| 108 | + if err != nil { |
| 109 | + return err |
| 110 | + } |
| 111 | + defer deferredRollback(txn) |
| 112 | + |
| 113 | + // Revoke all privileges before granting otherwise reducing privileges will not work. |
| 114 | + // We just have to revoke them in the same transaction so role will not lost his privileges between revoke and grant. |
| 115 | + if err = revokeRoleDefaultPrivileges(txn, d); err != nil { |
| 116 | + return err |
| 117 | + } |
| 118 | + |
| 119 | + if err = grantRoleDefaultPrivileges(txn, d); err != nil { |
| 120 | + return err |
| 121 | + } |
| 122 | + |
| 123 | + if err := txn.Commit(); err != nil { |
| 124 | + return err |
| 125 | + } |
| 126 | + |
| 127 | + d.SetId(generateDefaultPrivilegesID(d)) |
| 128 | + |
| 129 | + txn, err = startTransaction(client, d.Get("database").(string)) |
| 130 | + if err != nil { |
| 131 | + return err |
| 132 | + } |
| 133 | + defer deferredRollback(txn) |
| 134 | + |
| 135 | + return readRoleDefaultPrivileges(txn, d) |
| 136 | +} |
| 137 | + |
| 138 | +func resourcePostgreSQLDefaultPrivilegesDelete(d *schema.ResourceData, meta interface{}) error { |
| 139 | + client := meta.(*Client) |
| 140 | + |
| 141 | + client.catalogLock.Lock() |
| 142 | + defer client.catalogLock.Unlock() |
| 143 | + |
| 144 | + txn, err := startTransaction(client, d.Get("database").(string)) |
| 145 | + if err != nil { |
| 146 | + return err |
| 147 | + } |
| 148 | + defer deferredRollback(txn) |
| 149 | + |
| 150 | + revokeRoleDefaultPrivileges(txn, d) |
| 151 | + if err := txn.Commit(); err != nil { |
| 152 | + return err |
| 153 | + } |
| 154 | + |
| 155 | + return nil |
| 156 | +} |
| 157 | + |
| 158 | +func readRoleDefaultPrivileges(txn *sql.Tx, d *schema.ResourceData) error { |
| 159 | + role := d.Get("role").(string) |
| 160 | + owner := d.Get("owner").(string) |
| 161 | + pgSchema := d.Get("schema").(string) |
| 162 | + objectType := d.Get("object_type").(string) |
| 163 | + |
| 164 | + // This query aggregates the list of default privileges type (prtype) |
| 165 | + // for the role (grantee), owner (grantor), schema (namespace name) |
| 166 | + // and the specified object type (defaclobjtype). |
| 167 | + query := `SELECT array_agg(prtype) FROM ( |
| 168 | + SELECT defaclnamespace, (aclexplode(defaclacl)).* FROM pg_default_acl |
| 169 | + WHERE defaclobjtype = $3 |
| 170 | + ) AS t (namespace, grantor_oid, grantee_oid, prtype, grantable) |
| 171 | +
|
| 172 | + JOIN pg_namespace ON pg_namespace.oid = namespace |
| 173 | + WHERE pg_get_userbyid(grantee_oid) = $1 AND nspname = $2 AND pg_get_userbyid(grantor_oid) = $4; |
| 174 | +` |
| 175 | + var privileges pq.ByteaArray |
| 176 | + |
| 177 | + if err := txn.QueryRow( |
| 178 | + query, role, pgSchema, objectTypes[objectType], owner, |
| 179 | + ).Scan(&privileges); err != nil { |
| 180 | + return errwrap.Wrapf("could not read default privileges: {{err}}", err) |
| 181 | + } |
| 182 | + |
| 183 | + // We consider no privileges as "not exists" |
| 184 | + if len(privileges) == 0 { |
| 185 | + log.Printf("[DEBUG] no default privileges for role %s in schema %s", role, pgSchema) |
| 186 | + d.SetId("") |
| 187 | + return nil |
| 188 | + } |
| 189 | + |
| 190 | + privilegesSet := pgArrayToSet(privileges) |
| 191 | + d.Set("privileges", privilegesSet) |
| 192 | + d.SetId(generateDefaultPrivilegesID(d)) |
| 193 | + |
| 194 | + return nil |
| 195 | +} |
| 196 | + |
| 197 | +func grantRoleDefaultPrivileges(txn *sql.Tx, d *schema.ResourceData) error { |
| 198 | + role := d.Get("role").(string) |
| 199 | + pgSchema := d.Get("schema").(string) |
| 200 | + |
| 201 | + privileges := []string{} |
| 202 | + for _, priv := range d.Get("privileges").(*schema.Set).List() { |
| 203 | + privileges = append(privileges, priv.(string)) |
| 204 | + } |
| 205 | + |
| 206 | + // TODO: We grant default privileges for the DB owner |
| 207 | + // For that we need to be either superuser or a member of the owner role. |
| 208 | + // With AWS RDS, It's not possible to create superusers as it is restricted by AWS itself. |
| 209 | + // In that case, the only solution would be to have the PostgreSQL user used by Terraform |
| 210 | + // to be also part of the database owner role. |
| 211 | + |
| 212 | + query := fmt.Sprintf("ALTER DEFAULT PRIVILEGES FOR ROLE %s IN SCHEMA %s GRANT %s ON %sS TO %s", |
| 213 | + pq.QuoteIdentifier(d.Get("owner").(string)), |
| 214 | + pq.QuoteIdentifier(pgSchema), |
| 215 | + strings.Join(privileges, ","), |
| 216 | + strings.ToUpper(d.Get("object_type").(string)), |
| 217 | + pq.QuoteIdentifier(role), |
| 218 | + ) |
| 219 | + |
| 220 | + _, err := txn.Exec( |
| 221 | + query, |
| 222 | + ) |
| 223 | + if err != nil { |
| 224 | + return errwrap.Wrapf("could not alter default privileges: {{err}}", err) |
| 225 | + } |
| 226 | + |
| 227 | + return nil |
| 228 | +} |
| 229 | + |
| 230 | +func revokeRoleDefaultPrivileges(txn *sql.Tx, d *schema.ResourceData) error { |
| 231 | + query := fmt.Sprintf( |
| 232 | + "ALTER DEFAULT PRIVILEGES FOR ROLE %s IN SCHEMA %s REVOKE ALL ON %sS FROM %s", |
| 233 | + pq.QuoteIdentifier(d.Get("owner").(string)), |
| 234 | + pq.QuoteIdentifier(d.Get("schema").(string)), |
| 235 | + strings.ToUpper(d.Get("object_type").(string)), |
| 236 | + pq.QuoteIdentifier(d.Get("role").(string)), |
| 237 | + ) |
| 238 | + |
| 239 | + _, err := txn.Exec(query) |
| 240 | + return err |
| 241 | +} |
| 242 | + |
| 243 | +func generateDefaultPrivilegesID(d *schema.ResourceData) string { |
| 244 | + return strings.Join([]string{ |
| 245 | + d.Get("role").(string), d.Get("database").(string), d.Get("schema").(string), |
| 246 | + d.Get("owner").(string), d.Get("object_type").(string), |
| 247 | + }, "_") |
| 248 | +} |
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