Hein
337af294f3
Fixes GO-2026-6629 (golang.org/x/text precis panic). Bumps bun and bun/dialect/pgdialect together to v1.3.0; go directive now 1.26.0.
108 lines
4.3 KiB
Go
108 lines
4.3 KiB
Go
package pgconn
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import (
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"os"
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"os/user"
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"path/filepath"
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"strings"
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)
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// currentOSUser resolves the current OS user account. It is a seam so tests
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// can simulate os/user.Current failing -- including the unrecoverable
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// crashes reported in some restricted/broken-NSS container environments --
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// without needing such an environment.
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var currentOSUser = user.Current
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// userHomeDir resolves the current user's home directory. It is a seam so
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// tests can simulate os.UserHomeDir failing without needing to unset the
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// relevant environment variables for the whole process.
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//
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// os.UserHomeDir only reads %USERPROFILE% (falling back to
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// %HOMEDRIVE%+%HOMEPATH%) on this platform; it never calls into the Windows
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// user account APIs, so unlike os/user.Current it cannot crash in
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// restricted/broken container environments. That also means it can resolve
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// a different directory than the OS account API's reported home directory
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// if those environment variables have been overridden -- this is an
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// accepted tradeoff so that home-directory-derived defaults (pg_service.conf)
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// keep resolving even when the OS user account lookup itself is unavailable
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// or unsafe to call.
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var userHomeDir = os.UserHomeDir
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func defaultSettings() map[string]string {
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settings := make(map[string]string)
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settings["host"] = defaultHost()
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settings["port"] = defaultPort
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settings["target_session_attrs"] = "any"
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// The %APPDATA%\postgresql-derived defaults (pgpass.conf and the client
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// SSL certificate/key/root files) only need the APPDATA environment
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// variable, not the full OS user account, so they are resolved
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// unconditionally here. This keeps them available even when looking up
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// the OS user account (needed only for the default PostgreSQL user
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// name, see osUserSettings) is slow, fails, or -- in some restricted
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// container environments with a broken NSS/CGO setup -- would crash the
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// process.
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if appData := os.Getenv("APPDATA"); appData != "" {
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settings["passfile"] = filepath.Join(appData, "postgresql", "pgpass.conf")
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sslcert := filepath.Join(appData, "postgresql", "postgresql.crt")
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sslkey := filepath.Join(appData, "postgresql", "postgresql.key")
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if _, err := os.Stat(sslcert); err == nil {
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if _, err := os.Stat(sslkey); err == nil {
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// Both the cert and key must be present to use them, or do not use either
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settings["sslcert"] = sslcert
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settings["sslkey"] = sslkey
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}
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}
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sslrootcert := filepath.Join(appData, "postgresql", "root.crt")
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if _, err := os.Stat(sslrootcert); err == nil {
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settings["sslrootcert"] = sslrootcert
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}
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}
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// The default ~/.pg_service.conf location is derived from the user's
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// home directory, resolved the same crash-safe way as on other
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// platforms (see defaults.go).
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if homeDir, err := userHomeDir(); err == nil {
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settings["servicefile"] = filepath.Join(homeDir, ".pg_service.conf")
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}
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return settings
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}
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// osUserSettings returns the default PostgreSQL user name derived from the
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// current OS user account.
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//
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// Resolving this requires looking up the OS user account, which can be slow
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// or, in some restricted container environments (e.g. distroless images
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// with a broken NSS/CGO setup), crash the process. Callers must only call
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// osUserSettings when the default user name is not already supplied by the
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// connection string, environment, or service file.
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func osUserSettings() map[string]string {
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settings := make(map[string]string)
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// Default to the OS user name. Purposely ignoring err getting user name from
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// OS. The client application will simply have to specify the user in that
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// case (which they typically will be doing anyway).
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user, err := currentOSUser()
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if err == nil {
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// Windows gives us the username here as `DOMAIN\user` or `LOCALPCNAME\user`,
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// but the libpq default is just the `user` portion, so we strip off the first part.
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username := user.Username
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if strings.Contains(username, "\\") {
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username = username[strings.LastIndex(username, "\\")+1:]
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}
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settings["user"] = username
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}
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return settings
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}
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// defaultHost attempts to mimic libpq's default host. libpq uses the default unix socket location on *nix and localhost
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// on Windows. The default socket location is compiled into libpq. Since pgx does not have access to that default it
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// checks the existence of common locations.
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func defaultHost() string {
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return "localhost"
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}
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