291 lines
6.4 KiB
Go
291 lines
6.4 KiB
Go
package backends
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import (
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"database/sql"
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"fmt"
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"strconv"
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"strings"
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"github.com/iegomez/mosquitto-go-auth/backends/topics"
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"github.com/iegomez/mosquitto-go-auth/hashing"
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"github.com/jmoiron/sqlx"
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_ "github.com/lib/pq"
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"github.com/pkg/errors"
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log "github.com/sirupsen/logrus"
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)
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//Postgres holds all fields of the postgres db connection.
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type Postgres struct {
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DB *sqlx.DB
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Host string
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Port string
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DBName string
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User string
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Password string
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UserQuery string
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SuperuserQuery string
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AclQuery string
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SSLMode string
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SSLCert string
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SSLKey string
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SSLRootCert string
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hasher hashing.HashComparer
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maxLifeTime int64
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connectTries int
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}
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func NewPostgres(authOpts map[string]string, logLevel log.Level, hasher hashing.HashComparer) (Postgres, error) {
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log.SetLevel(logLevel)
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//Set defaults for postgres
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pgOk := true
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missingOptions := ""
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var postgres = Postgres{
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Host: "localhost",
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Port: "5432",
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SSLMode: "verify-full",
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SuperuserQuery: "",
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AclQuery: "",
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hasher: hasher,
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}
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if host, ok := authOpts["pg_host"]; ok {
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postgres.Host = host
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}
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if port, ok := authOpts["pg_port"]; ok {
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postgres.Port = port
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}
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if dbName, ok := authOpts["pg_dbname"]; ok {
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postgres.DBName = dbName
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} else {
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pgOk = false
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missingOptions += " pg_dbname"
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}
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if user, ok := authOpts["pg_user"]; ok {
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postgres.User = user
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} else {
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pgOk = false
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missingOptions += " pg_user"
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}
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if password, ok := authOpts["pg_password"]; ok {
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postgres.Password = password
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} else {
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pgOk = false
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missingOptions += " pg_password"
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}
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if userQuery, ok := authOpts["pg_userquery"]; ok {
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postgres.UserQuery = userQuery
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} else {
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pgOk = false
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missingOptions += " pg_userquery"
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}
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if superuserQuery, ok := authOpts["pg_superquery"]; ok {
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postgres.SuperuserQuery = superuserQuery
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}
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if aclQuery, ok := authOpts["pg_aclquery"]; ok {
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postgres.AclQuery = aclQuery
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}
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if sslmode, ok := authOpts["pg_sslmode"]; ok {
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switch sslmode {
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case "verify-full", "verify-ca", "require", "disable":
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default:
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log.Warnf("PG backend warning: using unknown pg_sslmode: '%s'", sslmode)
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}
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postgres.SSLMode = sslmode
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} else {
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postgres.SSLMode = "verify-full"
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}
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if sslCert, ok := authOpts["pg_sslcert"]; ok {
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postgres.SSLCert = sslCert
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}
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if sslKey, ok := authOpts["pg_sslkey"]; ok {
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postgres.SSLKey = sslKey
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}
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if sslRootCert, ok := authOpts["pg_sslrootcert"]; ok {
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postgres.SSLRootCert = sslRootCert
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}
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//Exit if any mandatory option is missing.
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if !pgOk {
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return postgres, errors.Errorf("PG backend error: missing options: %s", missingOptions)
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}
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//Build the dsn string and try to connect to the db.
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connStr := fmt.Sprintf("user=%s password=%s dbname=%s host=%s port=%s", postgres.User, postgres.Password, postgres.DBName, postgres.Host, postgres.Port)
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switch postgres.SSLMode {
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case "disable":
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connStr = fmt.Sprintf("%s sslmode=disable", connStr)
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case "require":
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connStr = fmt.Sprintf("%s sslmode=require", connStr)
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case "verify-ca":
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connStr = fmt.Sprintf("%s sslmode=verify-ca", connStr)
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case "verify-full":
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fallthrough
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default:
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connStr = fmt.Sprintf("%s sslmode=verify-full", connStr)
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}
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if postgres.SSLRootCert != "" {
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connStr = fmt.Sprintf("%s sslrootcert=%s", connStr, postgres.SSLRootCert)
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}
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if postgres.SSLKey != "" {
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connStr = fmt.Sprintf("%s sslkey=%s", connStr, postgres.SSLKey)
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}
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if postgres.SSLCert != "" {
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connStr = fmt.Sprintf("%s sslcert=%s", connStr, postgres.SSLCert)
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}
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if tries, ok := authOpts["pg_connect_tries"]; ok {
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connectTries, err := strconv.Atoi(tries)
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if err != nil {
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log.Warnf("invalid postgres connect tries options: %s", err)
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} else {
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postgres.connectTries = connectTries
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}
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}
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if maxLifeTime, ok := authOpts["pg_max_life_time"]; ok {
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lifeTime, err := strconv.ParseInt(maxLifeTime, 10, 64)
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if err == nil {
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postgres.maxLifeTime = lifeTime
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}
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}
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var err error
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postgres.DB, err = OpenDatabase(connStr, "postgres", postgres.connectTries, postgres.maxLifeTime)
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if err != nil {
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return postgres, errors.Errorf("PG backend error: couldn't open db: %s", err)
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}
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return postgres, nil
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}
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//GetUser checks that the username exists and the given password hashes to the same password.
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func (o Postgres) GetUser(username, password, clientid string) (bool, error) {
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var pwHash sql.NullString
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err := o.DB.Get(&pwHash, o.UserQuery, username)
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if err != nil {
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if err == sql.ErrNoRows {
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// avoid leaking the fact that user exists or not though error.
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return false, nil
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}
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log.Debugf("PG get user error: %s", err)
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return false, err
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}
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if !pwHash.Valid {
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log.Debugf("PG get user error: user %s not found", username)
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return false, err
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}
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if o.hasher.Compare(password, pwHash.String) {
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return true, nil
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}
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return false, nil
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}
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//GetSuperuser checks that the username meets the superuser query.
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func (o Postgres) GetSuperuser(username string) (bool, error) {
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//If there's no superuser query, return false.
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if o.SuperuserQuery == "" {
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return false, nil
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}
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var count sql.NullInt64
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err := o.DB.Get(&count, o.SuperuserQuery, username)
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if err != nil {
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if err == sql.ErrNoRows {
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// avoid leaking the fact that user exists or not though error.
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return false, nil
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}
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log.Debugf("PG get superuser error: %s", err)
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return false, err
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}
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if !count.Valid {
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log.Debugf("PG get superuser error: user %s not found", username)
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return false, nil
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}
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if count.Int64 > 0 {
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return true, nil
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}
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return false, nil
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}
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//CheckAcl gets all acls for the username and tries to match against topic, acc, and username/clientid if needed.
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func (o Postgres) CheckAcl(username, topic, clientid string, acc int32) (bool, error) {
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//If there's no acl query, assume all privileges for all users.
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if o.AclQuery == "" {
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return true, nil
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}
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var acls []string
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err := o.DB.Select(&acls, o.AclQuery, username, acc)
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if err != nil {
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log.Debugf("PG check acl error: %s", err)
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return false, err
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}
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for _, acl := range acls {
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aclTopic := strings.Replace(acl, "%c", clientid, -1)
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aclTopic = strings.Replace(aclTopic, "%u", username, -1)
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if topics.Match(aclTopic, topic) {
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return true, nil
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}
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}
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return false, nil
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}
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//GetName returns the backend's name
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func (o Postgres) GetName() string {
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return "Postgres"
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}
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//Halt closes the mysql connection.
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func (o Postgres) Halt() {
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if o.DB != nil {
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err := o.DB.Close()
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if err != nil {
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log.Errorf("Postgres cleanup error: %s", err)
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}
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}
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}
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