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package creds
import (
"net"
"os"
"path/filepath"
"strings"
"sync"
"github.com/git-lfs/git-lfs/v3/config"
"github.com/git-lfs/go-netrc/netrc"
"github.com/rubyist/tracerx"
)
type NetrcFinder interface {
FindMachine(string, string) *netrc.Machine
}
func ParseNetrc(osEnv config.Environment) (NetrcFinder, string, error) {
home, _ := osEnv.Get("HOME")
if len(home) == 0 {
return &noFinder{}, "", nil
}
nrcfilename := filepath.Join(home, netrcBasename)
if _, err := os.Stat(nrcfilename); err != nil {
return &noFinder{}, nrcfilename, nil
}
f, err := netrc.ParseFile(nrcfilename)
return f, nrcfilename, err
}
type noFinder struct{}
func (f *noFinder) FindMachine(host string, loginName string) *netrc.Machine {
return nil
}
// NetrcCredentialHelper retrieves credentials from a .netrc file
type netrcCredentialHelper struct {
netrcFinder NetrcFinder
mu sync.Mutex
skip map[string]bool
}
var defaultNetrcFinder = &noFinder{}
// NewNetrcCredentialHelper creates a new netrc credential helper using a
// .netrc file gleaned from the OS environment
func newNetrcCredentialHelper(osEnv config.Environment) *netrcCredentialHelper {
netrcFinder, netrcfile, err := ParseNetrc(osEnv)
if err != nil {
tracerx.Printf("bad netrc file %s: %s", netrcfile, err)
return nil
}
if netrcFinder == nil {
netrcFinder = defaultNetrcFinder
}
return &netrcCredentialHelper{netrcFinder: netrcFinder, skip: make(map[string]bool)}
}
func (c *netrcCredentialHelper) Fill(what Creds) (Creds, error) {
host, err := getNetrcHostname(what["host"])
if err != nil {
return nil, credHelperNoOp
}
c.mu.Lock()
defer c.mu.Unlock()
if c.skip[host] {
return nil, credHelperNoOp
}
if machine := c.netrcFinder.FindMachine(host, what["username"]); machine != nil {
creds := make(Creds)
creds["username"] = machine.Login
creds["password"] = machine.Password
creds["protocol"] = what["protocol"]
creds["host"] = what["host"]
creds["scheme"] = what["scheme"]
creds["path"] = what["path"]
creds["source"] = "netrc"
tracerx.Printf("netrc: git credential fill (%q, %q, %q, %q)",
what["protocol"], what["host"], machine.Login, what["path"])
return creds, nil
}
return nil, credHelperNoOp
}
func getNetrcHostname(hostname string) (string, error) {
if strings.Contains(hostname, ":") {
host, _, err := net.SplitHostPort(hostname)
if err != nil {
tracerx.Printf("netrc: error parsing %q: %s", hostname, err)
return "", err
}
return host, nil
}
return hostname, nil
}
func (c *netrcCredentialHelper) Approve(what Creds) error {
if what["source"] == "netrc" {
host, err := getNetrcHostname(what["host"])
if err != nil {
return credHelperNoOp
}
tracerx.Printf("netrc: git credential approve (%q, %q, %q)",
what["protocol"], what["host"], what["path"])
c.mu.Lock()
c.skip[host] = false
c.mu.Unlock()
return nil
}
return credHelperNoOp
}
func (c *netrcCredentialHelper) Reject(what Creds) error {
if what["source"] == "netrc" {
host, err := getNetrcHostname(what["host"])
if err != nil {
return credHelperNoOp
}
tracerx.Printf("netrc: git credential reject (%q, %q, %q)",
what["protocol"], what["host"], what["path"])
c.mu.Lock()
c.skip[host] = true
c.mu.Unlock()
return nil
}
return credHelperNoOp
}
|
