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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,146 @@ | ||
| package tssh | ||
|
|
||
| /* | ||
| MIT License | ||
| Copyright (c) 2023-2024 The Trzsz SSH Authors. | ||
| Permission is hereby granted, free of charge, to any person obtaining a copy | ||
| of this software and associated documentation files (the "Software"), to deal | ||
| in the Software without restriction, including without limitation the rights | ||
| to use, copy, modify, merge, publish, distribute, sublicense, and/or sell | ||
| copies of the Software, and to permit persons to whom the Software is | ||
| furnished to do so, subject to the following conditions: | ||
| The above copyright notice and this permission notice shall be included in all | ||
| copies or substantial portions of the Software. | ||
| THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR | ||
| IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, | ||
| FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE | ||
| AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER | ||
| LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, | ||
| OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE | ||
| SOFTWARE. | ||
| */ | ||
|
|
||
| import ( | ||
| "fmt" | ||
| "regexp" | ||
| "strings" | ||
|
|
||
| "golang.org/x/crypto/ssh" | ||
| ) | ||
|
|
||
| func debugCiphersConfig(config *ssh.ClientConfig) { | ||
| if !enableDebugLogging { | ||
| return | ||
| } | ||
| debug("user declared ciphers: %v", config.Ciphers) | ||
| config.SetDefaults() | ||
| debug("client supported ciphers: %v", config.Ciphers) | ||
| } | ||
|
|
||
| func appendCiphersConfig(config *ssh.ClientConfig, cipherSpec string) error { | ||
| config.SetDefaults() | ||
| for _, cipher := range strings.Split(cipherSpec, ",") { | ||
| cipher = strings.TrimSpace(cipher) | ||
| if cipher != "" { | ||
| config.Ciphers = append(config.Ciphers, cipher) | ||
| } | ||
| } | ||
| debugCiphersConfig(config) | ||
| return nil | ||
| } | ||
|
|
||
| func removeCiphersConfig(config *ssh.ClientConfig, cipherSpec string) error { | ||
| var buf strings.Builder | ||
| for _, cipher := range strings.Split(cipherSpec, ",") { | ||
| if buf.Len() > 0 { | ||
| buf.WriteRune('|') | ||
| } | ||
| buf.WriteString("(^") | ||
| for _, c := range cipher { | ||
| switch c { | ||
| case '*': | ||
| buf.WriteString(".*") | ||
| case '?': | ||
| buf.WriteRune('.') | ||
| case '(', ')', '[', ']', '{', '}', '.', '+', ',', '-', '^', '$', '|', '\\': | ||
| buf.WriteRune('\\') | ||
| buf.WriteRune(c) | ||
| default: | ||
| buf.WriteRune(c) | ||
| } | ||
| } | ||
| buf.WriteString("$)") | ||
| } | ||
| expr := buf.String() | ||
| debug("ciphers regexp: %s", expr) | ||
| re, err := regexp.Compile(expr) | ||
| if err != nil { | ||
| return fmt.Errorf("compile ciphers regexp failed: %v", err) | ||
| } | ||
|
|
||
| config.SetDefaults() | ||
| ciphers := make([]string, 0) | ||
| for _, cipher := range config.Ciphers { | ||
| if re.MatchString(cipher) { | ||
| continue | ||
| } | ||
| ciphers = append(ciphers, cipher) | ||
| } | ||
| config.Ciphers = ciphers | ||
| debugCiphersConfig(config) | ||
| return nil | ||
| } | ||
|
|
||
| func insertCiphersConfig(config *ssh.ClientConfig, cipherSpec string) error { | ||
| var ciphers []string | ||
| for _, cipher := range strings.Split(cipherSpec, ",") { | ||
| cipher = strings.TrimSpace(cipher) | ||
| if cipher != "" { | ||
| ciphers = append(ciphers, cipher) | ||
| } | ||
| } | ||
| config.SetDefaults() | ||
| config.Ciphers = append(ciphers, config.Ciphers...) | ||
| debugCiphersConfig(config) | ||
| return nil | ||
| } | ||
|
|
||
| func replaceCiphersConfig(config *ssh.ClientConfig, cipherSpec string) error { | ||
| config.Ciphers = nil | ||
| for _, cipher := range strings.Split(cipherSpec, ",") { | ||
| cipher = strings.TrimSpace(cipher) | ||
| if cipher != "" { | ||
| config.Ciphers = append(config.Ciphers, cipher) | ||
| } | ||
| } | ||
| debugCiphersConfig(config) | ||
| return nil | ||
| } | ||
|
|
||
| func getCiphersConfig(args *sshArgs) string { | ||
| if args.CipherSpec != "" { | ||
| return args.CipherSpec | ||
| } | ||
| return getOptionConfig(args, "Ciphers") | ||
| } | ||
|
|
||
| func setupCiphersConfig(args *sshArgs, config *ssh.ClientConfig) error { | ||
| cipherSpec := getCiphersConfig(args) | ||
| if cipherSpec == "" { | ||
| return nil | ||
| } | ||
| switch cipherSpec[0] { | ||
| case '+': | ||
| return appendCiphersConfig(config, cipherSpec[1:]) | ||
| case '-': | ||
| return removeCiphersConfig(config, cipherSpec[1:]) | ||
| case '^': | ||
| return insertCiphersConfig(config, cipherSpec[1:]) | ||
| default: | ||
| return replaceCiphersConfig(config, cipherSpec) | ||
| } | ||
| } |
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