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<body class="article">
<div id="header">
<h1>credentials API</h1>
</div>
<div id="content">
<div id="preamble">
<div class="sectionbody">
<div class="paragraph"><p>The credentials API provides an abstracted way of gathering username and
password credentials from the user (even though credentials in the wider
world can take many forms, in this document the word "credential" always
refers to a username and password pair).</p></div>
<div class="paragraph"><p>This document describes two interfaces: the C API that the credential
subsystem provides to the rest of Git, and the protocol that Git uses to
communicate with system-specific "credential helpers". If you are
writing Git code that wants to look up or prompt for credentials, see
the section "C API" below. If you want to write your own helper, see
the section on "Credential Helpers" below.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_typical_setup">Typical setup</h2>
<div class="sectionbody">
<div class="listingblock">
<div class="content">
<pre><code>+-----------------------+
| Git code (C) |--- to server requiring --->
| | authentication
|.......................|
| C credential API |--- prompt ---> User
+-----------------------+
^ |
| pipe |
| v
+-----------------------+
| Git credential helper |
+-----------------------+</code></pre>
</div></div>
<div class="paragraph"><p>The Git code (typically a remote-helper) will call the C API to obtain
credential data like a login/password pair (credential_fill). The
API will itself call a remote helper (e.g. "git credential-cache" or
"git credential-store") that may retrieve credential data from a
store. If the credential helper cannot find the information, the C API
will prompt the user. Then, the caller of the API takes care of
contacting the server, and does the actual authentication.</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_c_api">C API</h2>
<div class="sectionbody">
<div class="paragraph"><p>The credential C API is meant to be called by Git code which needs to
acquire or store a credential. It is centered around an object
representing a single credential and provides three basic operations:
fill (acquire credentials by calling helpers and/or prompting the user),
approve (mark a credential as successfully used so that it can be stored
for later use), and reject (mark a credential as unsuccessful so that it
can be erased from any persistent storage).</p></div>
<div class="sect2">
<h3 id="_data_structures">Data Structures</h3>
<div class="dlist"><dl>
<dt class="hdlist1">
<code>struct credential</code>
</dt>
<dd>
<p>
This struct represents a single username/password combination
along with any associated context. All string fields should be
heap-allocated (or NULL if they are not known or not applicable).
The meaning of the individual context fields is the same as
their counterparts in the helper protocol; see the section below
for a description of each field.
</p>
<div class="paragraph"><p>The <code>helpers</code> member of the struct is a <code>string_list</code> of helpers. Each
string specifies an external helper which will be run, in order, to
either acquire or store credentials. See the section on credential
helpers below. This list is filled-in by the API functions
according to the corresponding configuration variables before
consulting helpers, so there usually is no need for a caller to
modify the helpers field at all.</p></div>
<div class="paragraph"><p>This struct should always be initialized with <code>CREDENTIAL_INIT</code> or
<code>credential_init</code>.</p></div>
</dd>
</dl></div>
</div>
<div class="sect2">
<h3 id="_functions">Functions</h3>
<div class="dlist"><dl>
<dt class="hdlist1">
<code>credential_init</code>
</dt>
<dd>
<p>
Initialize a credential structure, setting all fields to empty.
</p>
</dd>
<dt class="hdlist1">
<code>credential_clear</code>
</dt>
<dd>
<p>
Free any resources associated with the credential structure,
returning it to a pristine initialized state.
</p>
</dd>
<dt class="hdlist1">
<code>credential_fill</code>
</dt>
<dd>
<p>
Instruct the credential subsystem to fill the username and
password fields of the passed credential struct by first
consulting helpers, then asking the user. After this function
returns, the username and password fields of the credential are
guaranteed to be non-NULL. If an error occurs, the function will
die().
</p>
</dd>
<dt class="hdlist1">
<code>credential_reject</code>
</dt>
<dd>
<p>
Inform the credential subsystem that the provided credentials
have been rejected. This will cause the credential subsystem to
notify any helpers of the rejection (which allows them, for
example, to purge the invalid credentials from storage). It
will also free() the username and password fields of the
credential and set them to NULL (readying the credential for
another call to <code>credential_fill</code>). Any errors from helpers are
ignored.
</p>
</dd>
<dt class="hdlist1">
<code>credential_approve</code>
</dt>
<dd>
<p>
Inform the credential subsystem that the provided credentials
were successfully used for authentication. This will cause the
credential subsystem to notify any helpers of the approval, so
that they may store the result to be used again. Any errors
from helpers are ignored.
</p>
</dd>
<dt class="hdlist1">
<code>credential_from_url</code>
</dt>
<dd>
<p>
Parse a URL into broken-down credential fields.
</p>
</dd>
</dl></div>
</div>
<div class="sect2">
<h3 id="_example">Example</h3>
<div class="paragraph"><p>The example below shows how the functions of the credential API could be
used to login to a fictitious "foo" service on a remote host:</p></div>
<div class="listingblock">
<div class="content">
<pre><code>int foo_login(struct foo_connection *f)
{
int status;
/*
* Create a credential with some context; we don't yet know the
* username or password.
*/
struct credential c = CREDENTIAL_INIT;
c.protocol = xstrdup("foo");
c.host = xstrdup(f->hostname);
/*
* Fill in the username and password fields by contacting
* helpers and/or asking the user. The function will die if it
* fails.
*/
credential_fill(&c);
/*
* Otherwise, we have a username and password. Try to use it.
*/
status = send_foo_login(f, c.username, c.password);
switch (status) {
case FOO_OK:
/* It worked. Store the credential for later use. */
credential_accept(&c);
break;
case FOO_BAD_LOGIN:
/* Erase the credential from storage so we don't try it
* again. */
credential_reject(&c);
break;
default:
/*
* Some other error occurred. We don't know if the
* credential is good or bad, so report nothing to the
* credential subsystem.
*/
}
/* Free any associated resources. */
credential_clear(&c);
return status;
}</code></pre>
</div></div>
</div>
</div>
</div>
<div class="sect1">
<h2 id="_credential_helpers">Credential Helpers</h2>
<div class="sectionbody">
<div class="paragraph"><p>Credential helpers are programs executed by Git to fetch or save
credentials from and to long-term storage (where "long-term" is simply
longer than a single Git process; e.g., credentials may be stored
in-memory for a few minutes, or indefinitely on disk).</p></div>
<div class="paragraph"><p>Each helper is specified by a single string in the configuration
variable <code>credential.helper</code> (and others, see <a href="../git-config.html">git-config(1)</a>).
The string is transformed by Git into a command to be executed using
these rules:</p></div>
<div class="olist arabic"><ol class="arabic">
<li>
<p>
If the helper string begins with "!", it is considered a shell
snippet, and everything after the "!" becomes the command.
</p>
</li>
<li>
<p>
Otherwise, if the helper string begins with an absolute path, the
verbatim helper string becomes the command.
</p>
</li>
<li>
<p>
Otherwise, the string "git credential-" is prepended to the helper
string, and the result becomes the command.
</p>
</li>
</ol></div>
<div class="paragraph"><p>The resulting command then has an "operation" argument appended to it
(see below for details), and the result is executed by the shell.</p></div>
<div class="paragraph"><p>Here are some example specifications:</p></div>
<div class="listingblock">
<div class="content">
<pre><code># run "git credential-foo"
foo
# same as above, but pass an argument to the helper
foo --bar=baz
# the arguments are parsed by the shell, so use shell
# quoting if necessary
foo --bar="whitespace arg"
# you can also use an absolute path, which will not use the git wrapper
/path/to/my/helper --with-arguments
# or you can specify your own shell snippet
!f() { echo "password=`cat $HOME/.secret`"; }; f</code></pre>
</div></div>
<div class="paragraph"><p>Generally speaking, rule (3) above is the simplest for users to specify.
Authors of credential helpers should make an effort to assist their
users by naming their program "git-credential-$NAME", and putting it in
the $PATH or $GIT_EXEC_PATH during installation, which will allow a user
to enable it with <code>git config credential.helper $NAME</code>.</p></div>
<div class="paragraph"><p>When a helper is executed, it will have one "operation" argument
appended to its command line, which is one of:</p></div>
<div class="dlist"><dl>
<dt class="hdlist1">
<code>get</code>
</dt>
<dd>
<p>
Return a matching credential, if any exists.
</p>
</dd>
<dt class="hdlist1">
<code>store</code>
</dt>
<dd>
<p>
Store the credential, if applicable to the helper.
</p>
</dd>
<dt class="hdlist1">
<code>erase</code>
</dt>
<dd>
<p>
Remove a matching credential, if any, from the helper’s storage.
</p>
</dd>
</dl></div>
<div class="paragraph"><p>The details of the credential will be provided on the helper’s stdin
stream. The exact format is the same as the input/output format of the
<code>git credential</code> plumbing command (see the section <code>INPUT/OUTPUT
FORMAT</code> in <a href="../git-credential.html">git-credential(7)</a> for a detailed specification).</p></div>
<div class="paragraph"><p>For a <code>get</code> operation, the helper should produce a list of attributes
on stdout in the same format. A helper is free to produce a subset, or
even no values at all if it has nothing useful to provide. Any provided
attributes will overwrite those already known about by Git.</p></div>
<div class="paragraph"><p>For a <code>store</code> or <code>erase</code> operation, the helper’s output is ignored.
If it fails to perform the requested operation, it may complain to
stderr to inform the user. If it does not support the requested
operation (e.g., a read-only store), it should silently ignore the
request.</p></div>
<div class="paragraph"><p>If a helper receives any other operation, it should silently ignore the
request. This leaves room for future operations to be added (older
helpers will just ignore the new requests).</p></div>
</div>
</div>
<div class="sect1">
<h2 id="_see_also">See also</h2>
<div class="sectionbody">
<div class="paragraph"><p><a href="../gitcredentials.html">gitcredentials(7)</a></p></div>
<div class="paragraph"><p><a href="../git-config.html">git-config(5)</a> (See configuration variables <code>credential.*</code>)</p></div>
</div>
</div>
</div>
<div id="footnotes"><hr /></div>
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<div id="footer-text">
Last updated 2013-06-10 20:01:55 UTC
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