Completely quote AppPath and CustomConf paths (#12955)
* Completely quote AppPath and CustomConf paths Properly handle spaces in AppPath and CustomConf within hooks and authorized_keys. Unfortunately here we don't seem to be able to get away with using go-shellquote as it appears that Windows doesn't play too well with singlequote quoting - therefore we will avoid singlequote quoting unless we absolutely cannot get away without it, e.g. \n or !. Fix #10813 Signed-off-by: Andrew Thornton <art27@cantab.net> * missing change Signed-off-by: Andrew Thornton <art27@cantab.net> * fix Test_CmdKeys Signed-off-by: Andrew Thornton <art27@cantab.net>
This commit is contained in:
zeripath
GitHub
parent
5cfc1f573f
commit
4c6ac08182
5 changed files with 200 additions and 8 deletions
|
|
@ -10,11 +10,11 @@ import (
|
|||
"io"
|
||||
"net/url"
|
||||
"os"
|
||||
"strconv"
|
||||
"testing"
|
||||
|
||||
"code.gitea.io/gitea/cmd"
|
||||
"code.gitea.io/gitea/modules/setting"
|
||||
"code.gitea.io/gitea/modules/util"
|
||||
|
||||
"github.com/urfave/cli"
|
||||
)
|
||||
|
|
@ -32,7 +32,7 @@ func Test_CmdKeys(t *testing.T) {
|
|||
{"with_key",
|
||||
[]string{"keys", "-e", "git", "-u", "git", "-t", "ssh-rsa", "-k", "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"},
|
||||
false,
|
||||
"# gitea public key\ncommand=\"" + setting.AppPath + " --config=" + strconv.Quote(strconv.Quote(setting.CustomConf))[1:len(strconv.Quote(strconv.Quote(setting.CustomConf)))-1] + " serv key-1\",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty ssh-rsa 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 user2@localhost\n",
|
||||
"# gitea public key\ncommand=\"" + setting.AppPath + " --config=" + util.ShellEscape(setting.CustomConf) + " serv key-1\",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty ssh-rsa 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 user2@localhost\n",
|
||||
},
|
||||
{"invalid", []string{"keys", "--not-a-flag=git"}, true, "Incorrect Usage: flag provided but not defined: -not-a-flag\n\n"},
|
||||
}
|
||||
|
|
|
|||
|
|
@ -38,8 +38,8 @@ import (
|
|||
|
||||
const (
|
||||
tplCommentPrefix = `# gitea public key`
|
||||
tplCommand = "%s --config=%q serv key-%d"
|
||||
tplPublicKey = tplCommentPrefix + "\n" + `command=%q,no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty %s` + "\n"
|
||||
tplCommand = "%s --config=%s serv key-%d"
|
||||
tplPublicKey = tplCommentPrefix + "\n" + `command=%s,no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty %s` + "\n"
|
||||
)
|
||||
|
||||
var sshOpLocker sync.Mutex
|
||||
|
|
@ -84,7 +84,7 @@ func (key *PublicKey) OmitEmail() string {
|
|||
|
||||
// AuthorizedString returns formatted public key string for authorized_keys file.
|
||||
func (key *PublicKey) AuthorizedString() string {
|
||||
return fmt.Sprintf(tplPublicKey, fmt.Sprintf(tplCommand, setting.AppPath, setting.CustomConf, key.ID), key.Content)
|
||||
return fmt.Sprintf(tplPublicKey, util.ShellEscape(fmt.Sprintf(tplCommand, util.ShellEscape(setting.AppPath), util.ShellEscape(setting.CustomConf), key.ID)), key.Content)
|
||||
}
|
||||
|
||||
func extractTypeFromBase64Key(key string) (string, error) {
|
||||
|
|
|
|||
|
|
@ -28,9 +28,9 @@ func getHookTemplates() (hookNames, hookTpls, giteaHookTpls []string) {
|
|||
fmt.Sprintf("#!/usr/bin/env %s\ndata=$(cat)\nexitcodes=\"\"\nhookname=$(basename $0)\nGIT_DIR=${GIT_DIR:-$(dirname $0)}\n\nfor hook in ${GIT_DIR}/hooks/${hookname}.d/*; do\ntest -x \"${hook}\" && test -f \"${hook}\" || continue\necho \"${data}\" | \"${hook}\"\nexitcodes=\"${exitcodes} $?\"\ndone\n\nfor i in ${exitcodes}; do\n[ ${i} -eq 0 ] || exit ${i}\ndone\n", setting.ScriptType),
|
||||
}
|
||||
giteaHookTpls = []string{
|
||||
fmt.Sprintf("#!/usr/bin/env %s\n\"%s\" hook --config='%s' pre-receive\n", setting.ScriptType, setting.AppPath, setting.CustomConf),
|
||||
fmt.Sprintf("#!/usr/bin/env %s\n\"%s\" hook --config='%s' update $1 $2 $3\n", setting.ScriptType, setting.AppPath, setting.CustomConf),
|
||||
fmt.Sprintf("#!/usr/bin/env %s\n\"%s\" hook --config='%s' post-receive\n", setting.ScriptType, setting.AppPath, setting.CustomConf),
|
||||
fmt.Sprintf("#!/usr/bin/env %s\n%s hook --config=%s pre-receive\n", setting.ScriptType, util.ShellEscape(setting.AppPath), util.ShellEscape(setting.CustomConf)),
|
||||
fmt.Sprintf("#!/usr/bin/env %s\n%s hook --config=%s update $1 $2 $3\n", setting.ScriptType, util.ShellEscape(setting.AppPath), util.ShellEscape(setting.CustomConf)),
|
||||
fmt.Sprintf("#!/usr/bin/env %s\n%s hook --config=%s post-receive\n", setting.ScriptType, util.ShellEscape(setting.AppPath), util.ShellEscape(setting.CustomConf)),
|
||||
}
|
||||
return
|
||||
}
|
||||
|
|
|
|||
100
modules/util/shellquote.go
Normal file
100
modules/util/shellquote.go
Normal file
|
|
@ -0,0 +1,100 @@
|
|||
// Copyright 2020 The Gitea Authors. All rights reserved.
|
||||
// Use of this source code is governed by a MIT-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package util
|
||||
|
||||
import "strings"
|
||||
|
||||
// Bash has the definition of a metacharacter:
|
||||
// * A character that, when unquoted, separates words.
|
||||
// A metacharacter is one of: " \t\n|&;()<>"
|
||||
//
|
||||
// The following characters also have addition special meaning when unescaped:
|
||||
// * ‘${[*?!"'`\’
|
||||
//
|
||||
// Double Quotes preserve the literal value of all characters with then quotes
|
||||
// excepting: ‘$’, ‘`’, ‘\’, and, when history expansion is enabled, ‘!’.
|
||||
// The backslash retains its special meaning only when followed by one of the
|
||||
// following characters: ‘$’, ‘`’, ‘"’, ‘\’, or newline.
|
||||
// Backslashes preceding characters without a special meaning are left
|
||||
// unmodified. A double quote may be quoted within double quotes by preceding
|
||||
// it with a backslash. If enabled, history expansion will be performed unless
|
||||
// an ‘!’ appearing in double quotes is escaped using a backslash. The
|
||||
// backslash preceding the ‘!’ is not removed.
|
||||
//
|
||||
// -> This means that `!\n` cannot be safely expressed in `"`.
|
||||
//
|
||||
// Looking at the man page for Dash and ash the situation is similar.
|
||||
//
|
||||
// Now zsh requires that ‘}’, and ‘]’ are also enclosed in doublequotes or escaped
|
||||
//
|
||||
// Single quotes escape everything except a ‘'’
|
||||
//
|
||||
// There's one other gotcha - ‘~’ at the start of a string needs to be expanded
|
||||
// because people always expect that - of course if there is a special character before '/'
|
||||
// this is not going to work
|
||||
|
||||
const (
|
||||
tildePrefix = '~'
|
||||
needsEscape = " \t\n|&;()<>${}[]*?!\"'`\\"
|
||||
needsSingleQuote = "!\n"
|
||||
)
|
||||
|
||||
var doubleQuoteEscaper = strings.NewReplacer(`$`, `\$`, "`", "\\`", `"`, `\"`, `\`, `\\`)
|
||||
var singleQuoteEscaper = strings.NewReplacer(`'`, `'\''`)
|
||||
var singleQuoteCoalescer = strings.NewReplacer(`''\'`, `\'`, `\'''`, `\'`)
|
||||
|
||||
// ShellEscape will escape the provided string.
|
||||
// We can't just use go-shellquote here because our preferences for escaping differ from those in that we want:
|
||||
//
|
||||
// * If the string doesn't require any escaping just leave it as it is.
|
||||
// * If the string requires any escaping prefer double quote escaping
|
||||
// * If we have ! or newlines then we need to use single quote escaping
|
||||
func ShellEscape(toEscape string) string {
|
||||
if len(toEscape) == 0 {
|
||||
return toEscape
|
||||
}
|
||||
|
||||
start := 0
|
||||
|
||||
if toEscape[0] == tildePrefix {
|
||||
// We're in the forcibly non-escaped section...
|
||||
idx := strings.IndexRune(toEscape, '/')
|
||||
if idx < 0 {
|
||||
idx = len(toEscape)
|
||||
} else {
|
||||
idx++
|
||||
}
|
||||
if !strings.ContainsAny(toEscape[:idx], needsEscape) {
|
||||
// We'll assume that they intend ~ expansion to occur
|
||||
start = idx
|
||||
}
|
||||
}
|
||||
|
||||
// Now for simplicity we'll look at the rest of the string
|
||||
if !strings.ContainsAny(toEscape[start:], needsEscape) {
|
||||
return toEscape
|
||||
}
|
||||
|
||||
// OK we have to do some escaping
|
||||
sb := &strings.Builder{}
|
||||
_, _ = sb.WriteString(toEscape[:start])
|
||||
|
||||
// Do we have any characters which absolutely need to be within single quotes - that is simply ! or \n?
|
||||
if strings.ContainsAny(toEscape[start:], needsSingleQuote) {
|
||||
// We need to single quote escape.
|
||||
sb2 := &strings.Builder{}
|
||||
_, _ = sb2.WriteRune('\'')
|
||||
_, _ = singleQuoteEscaper.WriteString(sb2, toEscape[start:])
|
||||
_, _ = sb2.WriteRune('\'')
|
||||
_, _ = singleQuoteCoalescer.WriteString(sb, sb2.String())
|
||||
return sb.String()
|
||||
}
|
||||
|
||||
// OK we can just use " just escape the things that need escaping
|
||||
_, _ = sb.WriteRune('"')
|
||||
_, _ = doubleQuoteEscaper.WriteString(sb, toEscape[start:])
|
||||
_, _ = sb.WriteRune('"')
|
||||
return sb.String()
|
||||
}
|
||||
92
modules/util/shellquote_test.go
Normal file
92
modules/util/shellquote_test.go
Normal file
|
|
@ -0,0 +1,92 @@
|
|||
// Copyright 2020 The Gitea Authors. All rights reserved.
|
||||
// Use of this source code is governed by a MIT-style
|
||||
// license that can be found in the LICENSE file.
|
||||
|
||||
package util
|
||||
|
||||
import "testing"
|
||||
|
||||
func TestShellEscape(t *testing.T) {
|
||||
tests := []struct {
|
||||
name string
|
||||
toEscape string
|
||||
want string
|
||||
}{
|
||||
{
|
||||
"Simplest case - nothing to escape",
|
||||
"a/b/c/d",
|
||||
"a/b/c/d",
|
||||
}, {
|
||||
"Prefixed tilde - with normal stuff - should not escape",
|
||||
"~/src/go/gitea/gitea",
|
||||
"~/src/go/gitea/gitea",
|
||||
}, {
|
||||
"Typical windows path with spaces - should get doublequote escaped",
|
||||
`C:\Program Files\Gitea v1.13 - I like lots of spaces\gitea`,
|
||||
`"C:\\Program Files\\Gitea v1.13 - I like lots of spaces\\gitea"`,
|
||||
}, {
|
||||
"Forward-slashed windows path with spaces - should get doublequote escaped",
|
||||
"C:/Program Files/Gitea v1.13 - I like lots of spaces/gitea",
|
||||
`"C:/Program Files/Gitea v1.13 - I like lots of spaces/gitea"`,
|
||||
}, {
|
||||
"Prefixed tilde - but then a space filled path",
|
||||
"~git/Gitea v1.13/gitea",
|
||||
`~git/"Gitea v1.13/gitea"`,
|
||||
}, {
|
||||
"Bangs are unforutunately not predictable so need to be singlequoted",
|
||||
"C:/Program Files/Gitea!/gitea",
|
||||
`'C:/Program Files/Gitea!/gitea'`,
|
||||
}, {
|
||||
"Newlines are just irritating",
|
||||
"/home/git/Gitea\n\nWHY-WOULD-YOU-DO-THIS\n\nGitea/gitea",
|
||||
"'/home/git/Gitea\n\nWHY-WOULD-YOU-DO-THIS\n\nGitea/gitea'",
|
||||
}, {
|
||||
"Similarly we should nicely handle mutiple single quotes if we have to single-quote",
|
||||
"'!''!'''!''!'!'",
|
||||
`\''!'\'\''!'\'\'\''!'\'\''!'\''!'\'`,
|
||||
}, {
|
||||
"Double quote < ...",
|
||||
"~/<gitea",
|
||||
"~/\"<gitea\"",
|
||||
}, {
|
||||
"Double quote > ...",
|
||||
"~/gitea>",
|
||||
"~/\"gitea>\"",
|
||||
}, {
|
||||
"Double quote and escape $ ...",
|
||||
"~/$gitea",
|
||||
"~/\"\\$gitea\"",
|
||||
}, {
|
||||
"Double quote {...",
|
||||
"~/{gitea",
|
||||
"~/\"{gitea\"",
|
||||
}, {
|
||||
"Double quote }...",
|
||||
"~/gitea}",
|
||||
"~/\"gitea}\"",
|
||||
}, {
|
||||
"Double quote ()...",
|
||||
"~/(gitea)",
|
||||
"~/\"(gitea)\"",
|
||||
}, {
|
||||
"Double quote and escape `...",
|
||||
"~/gitea`",
|
||||
"~/\"gitea\\`\"",
|
||||
}, {
|
||||
"Double quotes can handle a number of things without having to escape them but not everything ...",
|
||||
"~/<gitea> ${gitea} `gitea` [gitea] (gitea) \"gitea\" \\gitea\\ 'gitea'",
|
||||
"~/\"<gitea> \\${gitea} \\`gitea\\` [gitea] (gitea) \\\"gitea\\\" \\\\gitea\\\\ 'gitea'\"",
|
||||
}, {
|
||||
"Single quotes don't need to escape except for '...",
|
||||
"~/<gitea> ${gitea} `gitea` (gitea) !gitea! \"gitea\" \\gitea\\ 'gitea'",
|
||||
"~/'<gitea> ${gitea} `gitea` (gitea) !gitea! \"gitea\" \\gitea\\ '\\''gitea'\\'",
|
||||
},
|
||||
}
|
||||
for _, tt := range tests {
|
||||
t.Run(tt.name, func(t *testing.T) {
|
||||
if got := ShellEscape(tt.toEscape); got != tt.want {
|
||||
t.Errorf("ShellEscape(%q):\nGot: %s\nWanted: %s", tt.toEscape, got, tt.want)
|
||||
}
|
||||
})
|
||||
}
|
||||
}
|
||||
Loading…
Add table
Reference in a new issue