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git-credential.go
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git-credential.go
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package action
import (
"bufio"
"context"
"fmt"
"io"
"os"
"strings"
"github.com/gopasspw/gopass/pkg/ctxutil"
"github.com/gopasspw/gopass/pkg/fsutil"
"github.com/gopasspw/gopass/pkg/out"
"github.com/gopasspw/gopass/pkg/store/secret"
"github.com/gopasspw/gopass/pkg/store/sub"
"github.com/gopasspw/gopass/pkg/termio"
"github.com/urfave/cli"
)
type gitCredentials struct {
Protocol string
Host string
Path string
Username string
Password string
}
// WriteTo writes the given credentials to the given io.Writer in the git-credential format
func (c *gitCredentials) WriteTo(w io.Writer) (int64, error) {
var n int64
if c.Protocol != "" {
i, err := io.WriteString(w, "protocol="+c.Protocol+"\n")
n += int64(i)
if err != nil {
return n, err
}
}
if c.Host != "" {
i, err := io.WriteString(w, "host="+c.Host+"\n")
n += int64(i)
if err != nil {
return n, err
}
}
if c.Path != "" {
i, err := io.WriteString(w, "path="+c.Path+"\n")
n += int64(i)
if err != nil {
return n, err
}
}
if c.Username != "" {
i, err := io.WriteString(w, "username="+c.Username+"\n")
n += int64(i)
if err != nil {
return n, err
}
}
if c.Password != "" {
i, err := io.WriteString(w, "password="+c.Password+"\n")
n += int64(i)
if err != nil {
return n, err
}
}
return n, nil
}
func parseGitCredentials(r io.Reader) (*gitCredentials, error) {
rd := bufio.NewReader(r)
c := &gitCredentials{}
for {
key, err := rd.ReadString('=')
if err != nil {
if err == io.EOF {
if key == "" {
return c, nil
}
return nil, io.ErrUnexpectedEOF
}
return nil, err
}
key = strings.TrimSuffix(key, "=")
val, err := rd.ReadString('\n')
if err == io.EOF {
err = io.ErrUnexpectedEOF
}
if err != nil {
return nil, err
}
val = strings.TrimSuffix(val, "\n")
switch key {
case "protocol":
c.Protocol = val
case "host":
c.Host = val
case "path":
c.Path = val
case "username":
c.Username = val
case "password":
c.Password = val
}
}
}
// GitCredentialBefore is executed before another git-credential command
func (s *Action) GitCredentialBefore(ctx context.Context, c *cli.Context) error {
err := s.Initialized(ctx, c)
if err != nil {
return err
}
if !ctxutil.IsStdin(ctx) {
return ExitError(ctx, ExitUsage, nil, "missing stdin from git")
}
return nil
}
// GitCredentialGet returns a credential to git
func (s *Action) GitCredentialGet(ctx context.Context, c *cli.Context) error {
ctx = sub.WithAutoSync(ctx, false)
cred, err := parseGitCredentials(termio.Stdin)
if err != nil {
return ExitError(ctx, ExitUnsupported, err, "Error: %v while parsing git-credential", err)
}
// try git/host/username... If username is empty, simply try git/host
path := "git/" + fsutil.CleanFilename(cred.Host) + "/" + fsutil.CleanFilename(cred.Username)
if !s.Store.Exists(ctx, path) {
// if the looked up path is a directory with only one entry (e.g. one user per host), take the subentry instead
if !s.Store.IsDir(ctx, path) {
return nil
}
tree, err := s.Store.Tree(ctx)
if err != nil {
return ExitError(ctx, ExitDecrypt, err, "Error: %v while listing the storage", err)
}
sub, err := tree.FindFolder(path)
if err != nil {
// no entry found... this is not an error
return nil
}
entries := sub.List(0)
if len(entries) != 1 {
fmt.Fprintln(os.Stderr, "gopass error: too many entries")
return nil
}
path = "git/" + entries[0]
}
secret, err := s.Store.Get(ctx, path)
if err != nil {
return ExitError(ctx, ExitDecrypt, err, "")
}
cred.Password = secret.Password()
username, err := secret.Value("login")
if err == nil {
// leave the username as is otherwise
cred.Username = username
}
_, err = cred.WriteTo(out.Stdout)
if err != nil {
return ExitError(ctx, ExitIO, err, "Could not write to stdout")
}
return nil
}
// GitCredentialStore stores a credential got from git
func (s *Action) GitCredentialStore(ctx context.Context, c *cli.Context) error {
cred, err := parseGitCredentials(termio.Stdin)
if err != nil {
return ExitError(ctx, ExitUnsupported, err, "Error: %v while parsing git-credential", err)
}
path := "git/" + fsutil.CleanFilename(cred.Host) + "/" + fsutil.CleanFilename(cred.Username)
// This should never really be an issue because git automatically removes invalid credentials first
if s.Store.Exists(ctx, path) {
fmt.Fprintf(os.Stderr, ""+
"gopass: did not store \"%s\" because it already exists. "+
"If you want to overwrite it, delete it first by doing: "+
"\"gopass rm %s\"\n",
path, path,
)
return nil
}
secret := secret.New(cred.Password, "")
if cred.Username != "" {
_ = secret.SetValue("login", cred.Username)
}
err = s.Store.Set(ctx, path, secret)
if err != nil {
fmt.Fprintf(os.Stderr, "gopass error: error while writing to store: %v\n", err)
}
return nil
}
// GitCredentialErase removes a credential got from git
func (s *Action) GitCredentialErase(ctx context.Context, c *cli.Context) error {
cred, err := parseGitCredentials(termio.Stdin)
if err != nil {
return ExitError(ctx, ExitUnsupported, err, "Error: %v while parsing git-credential", err)
}
path := "git/" + fsutil.CleanFilename(cred.Host) + "/" + fsutil.CleanFilename(cred.Username)
err = s.Store.Delete(ctx, path)
if err != nil {
fmt.Fprintln(os.Stderr, "gopass error: error while writing to store")
}
return nil
}