我尝试过使用Hackage的curl包通过SFTP上传文件的各种方法，到目前为止所有这些都会产生以下错误：
* About to connect() to [redacted] port 22 (#0)
* Trying [redacted]... * connected
* Connected to [redacted] ([redacted]) port 22 (#0)
* Failure establishing ssh session
* Closing connection #0
* Failed initialization
ERROR: CurlFailedInit
我在Haskell中设置了以下选项：
[…]
Curl.setopt curlLib (Curl.CurlFailOnError True)
Curl.setDefaultSSLOpts curlLib url -- not necessary for sftp:// protocol, but shouldn't be a problem
Curl.setopt curlLib (Curl.CurlURL url)
Curl.setopt curlLib (Curl.CurlSSLVerifyHost 0)
Curl.setopt curlLib (Curl.CurlSSLVerifyPeer False)
Curl.setopt curlLib (Curl.CurlSSHAuthTypes [Curl.SSHAuthAny])
Curl.setopt curlLib (Curl.CurlUserPwd "user:password")
Curl.setopt curlLib (Curl.CurlUpload True)
[…]
我已验证网址，用户名和密码是否正确。此外，我还尝试使用SSHAuthPassword身份验证类型选项，并使用CurlUserName和CurlUserPassword设置用户名和密码。
从命令行执行curl
$ curl -vvv --upload-file test.txt --user 'user:password' "sftp://[redacted]/~/test.txt"
则成功
* About to connect() to [redacted] port 22 (#0)
* Trying [redacted]... connected
* Connected to [redacted] ([redacted]) port 22 (#0)
* Failed to read known hosts from [redacted]
* SSH host check: 0, key: [redacted]
* SSH authentication methods available: gssapi-keyex,gssapi-with-mic,publickey,password,keyboard-interactive
* Using ssh public key file [redacted]
* Using ssh private key file [redacted]
* SSH public key authentication failed: Unable to open public key file
* Initialized password authentication
* Authentication complete
[…]
* Closing connection #0
操作系统和库的版本如下：
$ uname -r
2.6.32-131.12.1.el6.x86_64
$ cat /etc/redhat-release
Red Hat Enterprise Linux Workstation release 6.1 (Santiago)
$ cabal info curl
[…]
Latest version installed: 1.3.8
[…]
$ curl --version
curl 7.19.7 (x86_64-redhat-linux-gnu) libcurl/7.19.7 NSS/3.14.3.0 zlib/1.2.3 libidn/1.18 libssh2/1.4.2
Protocols: tftp ftp telnet dict ldap ldaps http file https ftps scp sftp
Features: GSS-Negotiate IDN IPv6 Largefile NTLM SSL libz
我无法控制并且对我正在连接的服务器没有任何影响，因此切换到ssh-agent不是一种选择。