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package commandargs
import (
"fmt"
"regexp"
"strings"
"github.com/mattn/go-shellwords"
"gitlab.com/gitlab-org/gitlab-shell/v14/internal/sshenv"
)
const (
Discover CommandType = "discover"
TwoFactorRecover CommandType = "2fa_recovery_codes"
TwoFactorVerify CommandType = "2fa_verify"
LfsAuthenticate CommandType = "git-lfs-authenticate"
ReceivePack CommandType = "git-receive-pack"
UploadPack CommandType = "git-upload-pack"
UploadArchive CommandType = "git-upload-archive"
PersonalAccessToken CommandType = "personal_access_token"
)
var (
whoKeyRegex = regexp.MustCompile(`\Akey-(?P<keyid>\d+)\z`)
whoUsernameRegex = regexp.MustCompile(`\Ausername-(?P<username>\S+)\z`)
)
type Shell struct {
Arguments []string
GitlabUsername string
GitlabKeyId string
SshArgs []string
CommandType CommandType
Env sshenv.Env
}
func (s *Shell) Parse() error {
if err := s.validate(); err != nil {
return err
}
s.parseWho()
return nil
}
func (s *Shell) GetArguments() []string {
return s.Arguments
}
func (s *Shell) validate() error {
if !s.Env.IsSSHConnection {
return fmt.Errorf("Only SSH allowed")
}
if err := s.ParseCommand(s.Env.OriginalCommand); err != nil {
return fmt.Errorf("Invalid SSH command: %w", err)
}
return nil
}
func (s *Shell) parseWho() {
for _, argument := range s.Arguments {
if keyId := tryParseKeyId(argument); keyId != "" {
s.GitlabKeyId = keyId
break
}
if username := tryParseUsername(argument); username != "" {
s.GitlabUsername = username
break
}
}
}
func tryParse(r *regexp.Regexp, argument string) string {
// sshd may execute the session for AuthorizedKeysCommand in multiple ways:
// 1. key-id
// 2. /path/to/shell -c key-id
args := strings.Split(argument, " ")
lastArg := args[len(args)-1]
matchInfo := r.FindStringSubmatch(lastArg)
if len(matchInfo) == 2 {
// The first element is the full matched string
// The second element is the named `keyid` or `username`
return matchInfo[1]
}
return ""
}
func tryParseKeyId(argument string) string {
return tryParse(whoKeyRegex, argument)
}
func tryParseUsername(argument string) string {
return tryParse(whoUsernameRegex, argument)
}
func (s *Shell) ParseCommand(commandString string) error {
args, err := shellwords.Parse(commandString)
if err != nil {
return err
}
// Handle Git for Windows 2.14 using "git upload-pack" instead of git-upload-pack
if len(args) > 1 && args[0] == "git" {
command := args[0] + "-" + args[1]
commandArgs := args[2:]
args = append([]string{command}, commandArgs...)
}
s.SshArgs = args
s.defineCommandType()
return nil
}
func (s *Shell) defineCommandType() {
if len(s.SshArgs) == 0 {
s.CommandType = Discover
} else {
s.CommandType = CommandType(s.SshArgs[0])
}
}
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