51 lines
1.8 KiB
Markdown
51 lines
1.8 KiB
Markdown
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---
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c: Copyright (C) Daniel Stenberg, <daniel@haxx.se>, et al.
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SPDX-License-Identifier: curl
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Long: user
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Short: u
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Arg: <user:password>
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Help: Server user and password
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Category: important auth
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Added: 4.0
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Multi: single
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See-also:
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- netrc
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- config
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Example:
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- -u user:secret $URL
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---
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# `--user`
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Specify the username and password to use for server authentication. Overrides
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--netrc and --netrc-optional.
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If you simply specify the username, curl prompts for a password.
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The username and passwords are split up on the first colon, which makes it
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impossible to use a colon in the username with this option. The password can,
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still.
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On systems where it works, curl hides the given option argument from process
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listings. This is not enough to protect credentials from possibly getting seen
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by other users on the same system as they still are visible for a moment
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before cleared. Such sensitive data should be retrieved from a file instead or
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similar and never used in clear text in a command line.
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When using Kerberos V5 with a Windows based server you should include the
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Windows domain name in the username, in order for the server to successfully
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obtain a Kerberos Ticket. If you do not, then the initial authentication
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handshake may fail.
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When using NTLM, the username can be specified simply as the username, without
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the domain, if there is a single domain and forest in your setup for example.
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To specify the domain name use either Down-Level Logon Name or UPN (User
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Principal Name) formats. For example, EXAMPLE\user and user@example.com
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respectively.
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If you use a Windows SSPI-enabled curl binary and perform Kerberos V5,
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Negotiate, NTLM or Digest authentication then you can tell curl to select the
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username and password from your environment by specifying a single colon with
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this option: "-u :".
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