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sftp: add configuration options to set ssh Ciphers / MACs / KeyExchange

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dgouju 2022-11-03 18:11:28 +01:00 committed by GitHub
parent 028832ce73
commit 7042a11875
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1 changed files with 63 additions and 2 deletions
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65
backend/sftp/sftp.go
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@ -123,7 +123,10 @@ This enables the use of the following insecure ciphers and key exchange methods:
- diffie-hellman-group-exchange-sha256
- diffie-hellman-group-exchange-sha1
Those algorithms are insecure and may allow plaintext data to be recovered by an attacker.`,
Those algorithms are insecure and may allow plaintext data to be recovered by an attacker.
This must be false if you use either ciphers or key_exchange advanced options.
`,
Default: false,
Examples: []fs.OptionExample{
{
@ -325,6 +328,46 @@ and pass variables with spaces in in quotes, eg
"VAR3=value with space" "VAR4=value with space" VAR5=nospacehere
`,
Advanced: true,
}, {
Name: "ciphers",
Default: fs.SpaceSepList{},
Help: `Space separated list of ciphers to be used for session encryption, ordered by preference.
At least one must match with server configuration. This can be checked for example using ssh -Q cipher.
This must not be set if use_insecure_cipher is true.
Example:
aes128-ctr aes192-ctr aes256-ctr aes128-gcm@openssh.com aes256-gcm@openssh.com
`,
Advanced: true,
}, {
Name: "key_exchange",
Default: fs.SpaceSepList{},
Help: `Space separated list of key exchange algorithms, ordered by preference.
At least one must match with server configuration. This can be checked for example using ssh -Q kex.
This must not be set if use_insecure_cipher is true.
Example:
sntrup761x25519-sha512@openssh.com curve25519-sha256 curve25519-sha256@libssh.org ecdh-sha2-nistp256
`,
Advanced: true,
}, {
Name: "macs",
Default: fs.SpaceSepList{},
Help: `Space separated list of MACs (message authentication code) algorithms, ordered by preference.
At least one must match with server configuration. This can be checked for example using ssh -Q mac.
Example:
umac-64-etm@openssh.com umac-128-etm@openssh.com hmac-sha2-256-etm@openssh.com
`,
Advanced: true,
}},
@ -362,6 +405,9 @@ type Options struct {
ChunkSize fs.SizeSuffix `config:"chunk_size"`
Concurrency int `config:"concurrency"`
SetEnv fs.SpaceSepList `config:"set_env"`
Ciphers fs.SpaceSepList `config:"ciphers"`
KeyExchange fs.SpaceSepList `config:"key_exchange"`
MACs fs.SpaceSepList `config:"macs"`
}
// Fs stores the interface to the remote SFTP files
@ -702,10 +748,25 @@ func NewFs(ctx context.Context, name, root string, m configmap.Mapper) (fs.Fs, e
sshConfig.HostKeyCallback = hostcallback
}
if opt.UseInsecureCipher && (opt.Ciphers != nil || opt.KeyExchange != nil) {
return nil, fmt.Errorf("use_insecure_cipher must be false if ciphers or key_exchange are set in advanced configuration")
}
sshConfig.Config.SetDefaults()
if opt.UseInsecureCipher {
sshConfig.Config.SetDefaults()
sshConfig.Config.Ciphers = append(sshConfig.Config.Ciphers, "aes128-cbc", "aes192-cbc", "aes256-cbc", "3des-cbc")
sshConfig.Config.KeyExchanges = append(sshConfig.Config.KeyExchanges, "diffie-hellman-group-exchange-sha1", "diffie-hellman-group-exchange-sha256")
} else {
if opt.Ciphers != nil {
sshConfig.Config.Ciphers = opt.Ciphers
}
if opt.KeyExchange != nil {
sshConfig.Config.KeyExchanges = opt.KeyExchange
}
}
if opt.MACs != nil {
sshConfig.Config.MACs = opt.MACs
}
keyFile := env.ShellExpand(opt.KeyFile)