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adbb38f298
The PostgreSQL server will reject messages greater than ~1 GB anyway. However, worse than that is that a message that is larger than 4 GB could wrap the 32-bit integer message size and be interpreted by the server as multiple messages. This could allow a malicious client to inject arbitrary protocol messages. https://github.com/jackc/pgx/security/advisories/GHSA-mrww-27vc-gghv
50 lines
1.0 KiB
Go
50 lines
1.0 KiB
Go
package pgproto3
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import (
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"encoding/binary"
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"encoding/json"
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"errors"
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"github.com/jackc/pgx/v5/internal/pgio"
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)
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const gssEncReqNumber = 80877104
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type GSSEncRequest struct {
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}
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// Frontend identifies this message as sendable by a PostgreSQL frontend.
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func (*GSSEncRequest) Frontend() {}
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func (dst *GSSEncRequest) Decode(src []byte) error {
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if len(src) < 4 {
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return errors.New("gss encoding request too short")
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}
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requestCode := binary.BigEndian.Uint32(src)
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if requestCode != gssEncReqNumber {
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return errors.New("bad gss encoding request code")
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}
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return nil
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}
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// Encode encodes src into dst. dst will include the 4 byte message length.
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func (src *GSSEncRequest) Encode(dst []byte) ([]byte, error) {
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dst = pgio.AppendInt32(dst, 8)
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dst = pgio.AppendInt32(dst, gssEncReqNumber)
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return dst, nil
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}
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// MarshalJSON implements encoding/json.Marshaler.
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func (src GSSEncRequest) MarshalJSON() ([]byte, error) {
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return json.Marshal(struct {
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Type string
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ProtocolVersion uint32
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Parameters map[string]string
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}{
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Type: "GSSEncRequest",
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})
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}
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