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Improve SSH key parser to handle newlines in keys (#7522) 

* Strip newlines from SSH keys before adding them

Fixes: https://github.com/go-gitea/gitea/issues/7500

* add test for CheckPublicKeyString

* add one more test

* simplify test

* further simplify

* make fmt
This commit is contained in:
silverwind 2019-07-23 15:25:06 +02:00 committed by Lauris BH
parent bcbc9f33d7
commit b10109ffe8
2 changed files with 28 additions and 6 deletions
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18
models/ssh_key.go
View File

@ -96,17 +96,18 @@ func extractTypeFromBase64Key(key string) (string, error) {
// parseKeyString parses any key string in OpenSSH or SSH2 format to clean OpenSSH string (RFC4253). // parseKeyString parses any key string in OpenSSH or SSH2 format to clean OpenSSH string (RFC4253).
func parseKeyString(content string) (string, error) { func parseKeyString(content string) (string, error) {
// Transform all legal line endings to a single "\n". // remove whitespace at start and end
content = strings.NewReplacer("\r\n", "\n", "\r", "\n").Replace(content)
// remove trailing newline (and beginning spaces too)
content = strings.TrimSpace(content) content = strings.TrimSpace(content)
lines := strings.Split(content, "\n")
var keyType, keyContent, keyComment string var keyType, keyContent, keyComment string
if len(lines) == 1 { if !strings.Contains(content, "-----BEGIN") {
// Parse OpenSSH format. // Parse OpenSSH format.
parts := strings.SplitN(lines[0], " ", 3)
// Remove all newlines
content = strings.NewReplacer("\r\n", "", "\n", "").Replace(content)
parts := strings.SplitN(content, " ", 3)
switch len(parts) { switch len(parts) {
case 0: case 0:
return "", errors.New("empty key") return "", errors.New("empty key")
@ -133,6 +134,11 @@ func parseKeyString(content string) (string, error) {
} }
} else { } else {
// Parse SSH2 file format. // Parse SSH2 file format.
// Transform all legal line endings to a single "\n".
content = strings.NewReplacer("\r\n", "\n", "\r", "\n").Replace(content)
lines := strings.Split(content, "\n")
continuationLine := false continuationLine := false
for _, line := range lines { for _, line := range lines {

16
models/ssh_key_test.go
View File

@ -56,6 +56,22 @@ func Test_SSHParsePublicKey(t *testing.T) {
} }
} }
func Test_CheckPublicKeyString(t *testing.T) {
for _, test := range []struct {
content string
}{
{"ssh-dss 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 nocomment"},
{"ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAAAgQDAu7tvIvX6ZHrRXuZNfkR3XLHSsuCK9Zn3X58lxBcQzuo5xZgB6vRwwm/QtJuF+zZPtY5hsQILBLmF+BZ5WpKZp1jBeSjH2G7lxet9kbcH+kIVj0tPFEoyKI9wvWqIwC4prx/WVk2wLTJjzBAhyNxfEq7C9CeiX9pQEbEqJfkKCQ== nocomment\n"},
{"ssh-rsa AAAAB3NzaC1yc2EA\r\nAAADAQABAAAAgQDAu7tvIvX6ZHrRXuZNfkR3XLHSsuCK9Zn3X58lxBcQzuo5xZgB6vRwwm/QtJuF+zZPtY5hsQILBLmF+\r\nBZ5WpKZp1jBeSjH2G7lxet9kbcH+kIVj0tPFEoyKI9wvWqIwC4prx/WVk2wLTJjzBAhyNx\r\nfEq7C9CeiX9pQEbEqJfkKCQ== nocomment\r\n\r\n"},
{"ssh-rsa AAAAB3NzaC1yc2EA\r\nAAADAQABAAAAgQDAu7tvI\nvX6ZHrRXuZNfkR3XLHSsuCK9Zn3X58lxBcQzuo5xZgB6vRwwm/QtJuF+zZPtY5hsQILBLmF+\r\nBZ5WpKZp1jBeSjH2G7lxet9kbcH+kIVj0tPFEoyKI9wvW\nqIwC4prx/WVk2wLTJjzBAhyNx\r\nfEq7C9CeiX9pQEbEqJfkKCQ== nocomment\r\n\r\n"},
{"ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAICV0MGX/W9IvLA4FXpIuUcdDcbj5KX4syHgsTy7soVgf"},
{"\r\nssh-ed25519 \r\nAAAAC3NzaC1lZDI1NTE5AAAAICV0MGX/W9IvLA4FXpIuUcdDcbj5KX4syHgsTy7soVgf\r\n\r\n"},
} {
_, err := CheckPublicKeyString(test.content)
assert.NoError(t, err)
}
}
func Test_calcFingerprint(t *testing.T) { func Test_calcFingerprint(t *testing.T) {
testCases := []struct { testCases := []struct {
name string name string