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Add an SFTP backend that supports more ciphers and kex algorithms.

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"sftpc://" supports all algorithms implemented in golang.org/x/crypto/ssh,
especially including those weak ones that are excluded from the defaults.
This commit is contained in:
Gilbert Chen
2020-06-08 11:24:20 -04:00
parent 09e3cdfebf
commit 1adcf56890
2 changed files with 19 additions and 6 deletions
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21
src/duplicacy_sftpstorage.go
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@@ -43,10 +43,10 @@ func CreateSFTPStorageWithPassword(server string, port int, username string, sto
return nil
}
return CreateSFTPStorage(server, port, username, storageDir, minimumNesting, authMethods, hostKeyCallback, threads)
return CreateSFTPStorage(false, server, port, username, storageDir, minimumNesting, authMethods, hostKeyCallback, threads)
}
func CreateSFTPStorage(server string, port int, username string, storageDir string, minimumNesting int,
func CreateSFTPStorage(compatibilityMode bool, server string, port int, username string, storageDir string, minimumNesting int,
authMethods []ssh.AuthMethod,
hostKeyCallback func(hostname string, remote net.Addr,
key ssh.PublicKey) error, threads int) (storage *SFTPStorage, err error) {
@@ -57,8 +57,21 @@ func CreateSFTPStorage(server string, port int, username string, storageDir stri
HostKeyCallback: hostKeyCallback,
}
if server == "sftp.hidrive.strato.com" {
sftpConfig.Ciphers = []string{"aes128-ctr", "aes256-ctr"}
if compatibilityMode {
sftpConfig.Ciphers = []string{
"aes128-ctr", "aes192-ctr", "aes256-ctr",
"aes128-gcm@openssh.com",
"chacha20-poly1305@openssh.com",
"arcfour256", "arcfour128", "arcfour",
"aes128-cbc",
"3des-cbc",
}
sftpConfig.KeyExchanges = [] string {
"curve25519-sha256@libssh.org",
"ecdh-sha2-nistp256", "ecdh-sha2-nistp384", "ecdh-sha2-nistp521",
"diffie-hellman-group1-sha1", "diffie-hellman-group14-sha1",
"diffie-hellman-group-exchange-sha1", "diffie-hellman-group-exchange-sha256",
}
}
serverAddress := fmt.Sprintf("%s:%d", server, port)