| Junio C Hamano | 0df9271 | 2011-12-21 22:30:44 | [diff] [blame^] | 1 | <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.1//EN" |
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| 551 | </head> |
| 552 | <body> |
| 553 | <div id="header"> |
| 554 | <h1>credentials API</h1> |
| 555 | </div> |
| 556 | <div id="content"> |
| 557 | <div id="preamble"> |
| 558 | <div class="sectionbody"> |
| 559 | <div class="paragraph"><p>The credentials API provides an abstracted way of gathering username and |
| 560 | password credentials from the user (even though credentials in the wider |
| 561 | world can take many forms, in this document the word "credential" always |
| 562 | refers to a username and password pair).</p></div> |
| 563 | </div> |
| 564 | </div> |
| 565 | <h2 id="_data_structures">Data Structures</h2> |
| 566 | <div class="sectionbody"> |
| 567 | <div class="dlist"><dl> |
| 568 | <dt class="hdlist1"> |
| 569 | <tt>struct credential</tt> |
| 570 | </dt> |
| 571 | <dd> |
| 572 | <p> |
| 573 | This struct represents a single username/password combination |
| 574 | along with any associated context. All string fields should be |
| 575 | heap-allocated (or NULL if they are not known or not applicable). |
| 576 | The meaning of the individual context fields is the same as |
| 577 | their counterparts in the helper protocol; see the section below |
| 578 | for a description of each field. |
| 579 | </p> |
| 580 | <div class="paragraph"><p>The <tt>helpers</tt> member of the struct is a <tt>string_list</tt> of helpers. Each |
| 581 | string specifies an external helper which will be run, in order, to |
| 582 | either acquire or store credentials. See the section on credential |
| 583 | helpers below.</p></div> |
| 584 | <div class="paragraph"><p>This struct should always be initialized with <tt>CREDENTIAL_INIT</tt> or |
| 585 | <tt>credential_init</tt>.</p></div> |
| 586 | </dd> |
| 587 | </dl></div> |
| 588 | </div> |
| 589 | <h2 id="_functions">Functions</h2> |
| 590 | <div class="sectionbody"> |
| 591 | <div class="dlist"><dl> |
| 592 | <dt class="hdlist1"> |
| 593 | <tt>credential_init</tt> |
| 594 | </dt> |
| 595 | <dd> |
| 596 | <p> |
| 597 | Initialize a credential structure, setting all fields to empty. |
| 598 | </p> |
| 599 | </dd> |
| 600 | <dt class="hdlist1"> |
| 601 | <tt>credential_clear</tt> |
| 602 | </dt> |
| 603 | <dd> |
| 604 | <p> |
| 605 | Free any resources associated with the credential structure, |
| 606 | returning it to a pristine initialized state. |
| 607 | </p> |
| 608 | </dd> |
| 609 | <dt class="hdlist1"> |
| 610 | <tt>credential_fill</tt> |
| 611 | </dt> |
| 612 | <dd> |
| 613 | <p> |
| 614 | Instruct the credential subsystem to fill the username and |
| 615 | password fields of the passed credential struct by first |
| 616 | consulting helpers, then asking the user. After this function |
| 617 | returns, the username and password fields of the credential are |
| 618 | guaranteed to be non-NULL. If an error occurs, the function will |
| 619 | die(). |
| 620 | </p> |
| 621 | </dd> |
| 622 | <dt class="hdlist1"> |
| 623 | <tt>credential_reject</tt> |
| 624 | </dt> |
| 625 | <dd> |
| 626 | <p> |
| 627 | Inform the credential subsystem that the provided credentials |
| 628 | have been rejected. This will cause the credential subsystem to |
| 629 | notify any helpers of the rejection (which allows them, for |
| 630 | example, to purge the invalid credentials from storage). It |
| 631 | will also free() the username and password fields of the |
| 632 | credential and set them to NULL (readying the credential for |
| 633 | another call to <tt>credential_fill</tt>). Any errors from helpers are |
| 634 | ignored. |
| 635 | </p> |
| 636 | </dd> |
| 637 | <dt class="hdlist1"> |
| 638 | <tt>credential_approve</tt> |
| 639 | </dt> |
| 640 | <dd> |
| 641 | <p> |
| 642 | Inform the credential subsystem that the provided credentials |
| 643 | were successfully used for authentication. This will cause the |
| 644 | credential subsystem to notify any helpers of the approval, so |
| 645 | that they may store the result to be used again. Any errors |
| 646 | from helpers are ignored. |
| 647 | </p> |
| 648 | </dd> |
| 649 | <dt class="hdlist1"> |
| 650 | <tt>credential_from_url</tt> |
| 651 | </dt> |
| 652 | <dd> |
| 653 | <p> |
| 654 | Parse a URL into broken-down credential fields. |
| 655 | </p> |
| 656 | </dd> |
| 657 | </dl></div> |
| 658 | </div> |
| 659 | <h2 id="_example">Example</h2> |
| 660 | <div class="sectionbody"> |
| 661 | <div class="paragraph"><p>The example below shows how the functions of the credential API could be |
| 662 | used to login to a fictitious "foo" service on a remote host:</p></div> |
| 663 | <div class="listingblock"> |
| 664 | <div class="content"> |
| 665 | <pre><tt>int foo_login(struct foo_connection *f) |
| 666 | { |
| 667 | int status; |
| 668 | /* |
| 669 | * Create a credential with some context; we don't yet know the |
| 670 | * username or password. |
| 671 | */ |
| 672 | |
| 673 | struct credential c = CREDENTIAL_INIT; |
| 674 | c.protocol = xstrdup("foo"); |
| 675 | c.host = xstrdup(f->hostname); |
| 676 | |
| 677 | /* |
| 678 | * Fill in the username and password fields by contacting |
| 679 | * helpers and/or asking the user. The function will die if it |
| 680 | * fails. |
| 681 | */ |
| 682 | credential_fill(&c); |
| 683 | |
| 684 | /* |
| 685 | * Otherwise, we have a username and password. Try to use it. |
| 686 | */ |
| 687 | status = send_foo_login(f, c.username, c.password); |
| 688 | switch (status) { |
| 689 | case FOO_OK: |
| 690 | /* It worked. Store the credential for later use. */ |
| 691 | credential_accept(&c); |
| 692 | break; |
| 693 | case FOO_BAD_LOGIN: |
| 694 | /* Erase the credential from storage so we don't try it |
| 695 | * again. */ |
| 696 | credential_reject(&c); |
| 697 | break; |
| 698 | default: |
| 699 | /* |
| 700 | * Some other error occured. We don't know if the |
| 701 | * credential is good or bad, so report nothing to the |
| 702 | * credential subsystem. |
| 703 | */ |
| 704 | } |
| 705 | |
| 706 | /* Free any associated resources. */ |
| 707 | credential_clear(&c); |
| 708 | |
| 709 | return status; |
| 710 | }</tt></pre> |
| 711 | </div></div> |
| 712 | </div> |
| 713 | <h2 id="_credential_helpers">Credential Helpers</h2> |
| 714 | <div class="sectionbody"> |
| 715 | <div class="paragraph"><p>Credential helpers are programs executed by git to fetch or save |
| 716 | credentials from and to long-term storage (where "long-term" is simply |
| 717 | longer than a single git process; e.g., credentials may be stored |
| 718 | in-memory for a few minutes, or indefinitely on disk).</p></div> |
| 719 | <div class="paragraph"><p>Each helper is specified by a single string. The string is transformed |
| 720 | by git into a command to be executed using these rules:</p></div> |
| 721 | <div class="olist arabic"><ol class="arabic"> |
| 722 | <li> |
| 723 | <p> |
| 724 | If the helper string begins with "!", it is considered a shell |
| 725 | snippet, and everything after the "!" becomes the command. |
| 726 | </p> |
| 727 | </li> |
| 728 | <li> |
| 729 | <p> |
| 730 | Otherwise, if the helper string begins with an absolute path, the |
| 731 | verbatim helper string becomes the command. |
| 732 | </p> |
| 733 | </li> |
| 734 | <li> |
| 735 | <p> |
| 736 | Otherwise, the string "git credential-" is prepended to the helper |
| 737 | string, and the result becomes the command. |
| 738 | </p> |
| 739 | </li> |
| 740 | </ol></div> |
| 741 | <div class="paragraph"><p>The resulting command then has an "operation" argument appended to it |
| 742 | (see below for details), and the result is executed by the shell.</p></div> |
| 743 | <div class="paragraph"><p>Here are some example specifications:</p></div> |
| 744 | <div class="listingblock"> |
| 745 | <div class="content"> |
| 746 | <pre><tt># run "git credential-foo" |
| 747 | foo |
| 748 | |
| 749 | # same as above, but pass an argument to the helper |
| 750 | foo --bar=baz |
| 751 | |
| 752 | # the arguments are parsed by the shell, so use shell |
| 753 | # quoting if necessary |
| 754 | foo --bar="whitespace arg" |
| 755 | |
| 756 | # you can also use an absolute path, which will not use the git wrapper |
| 757 | /path/to/my/helper --with-arguments |
| 758 | |
| 759 | # or you can specify your own shell snippet |
| 760 | !f() { echo "password=`cat $HOME/.secret`"; }; f</tt></pre> |
| 761 | </div></div> |
| 762 | <div class="paragraph"><p>Generally speaking, rule (3) above is the simplest for users to specify. |
| 763 | Authors of credential helpers should make an effort to assist their |
| 764 | users by naming their program "git-credential-$NAME", and putting it in |
| 765 | the $PATH or $GIT_EXEC_PATH during installation, which will allow a user |
| 766 | to enable it with <tt>git config credential.helper $NAME</tt>.</p></div> |
| 767 | <div class="paragraph"><p>When a helper is executed, it will have one "operation" argument |
| 768 | appended to its command line, which is one of:</p></div> |
| 769 | <div class="dlist"><dl> |
| 770 | <dt class="hdlist1"> |
| 771 | <tt>get</tt> |
| 772 | </dt> |
| 773 | <dd> |
| 774 | <p> |
| 775 | Return a matching credential, if any exists. |
| 776 | </p> |
| 777 | </dd> |
| 778 | <dt class="hdlist1"> |
| 779 | <tt>store</tt> |
| 780 | </dt> |
| 781 | <dd> |
| 782 | <p> |
| 783 | Store the credential, if applicable to the helper. |
| 784 | </p> |
| 785 | </dd> |
| 786 | <dt class="hdlist1"> |
| 787 | <tt>erase</tt> |
| 788 | </dt> |
| 789 | <dd> |
| 790 | <p> |
| 791 | Remove a matching credential, if any, from the helper’s storage. |
| 792 | </p> |
| 793 | </dd> |
| 794 | </dl></div> |
| 795 | <div class="paragraph"><p>The details of the credential will be provided on the helper’s stdin |
| 796 | stream. The credential is split into a set of named attributes. |
| 797 | Attributes are provided to the helper, one per line. Each attribute is |
| 798 | specified by a key-value pair, separated by an <tt>=</tt> (equals) sign, |
| 799 | followed by a newline. The key may contain any bytes except <tt>=</tt>, |
| 800 | newline, or NUL. The value may contain any bytes except newline or NUL. |
| 801 | In both cases, all bytes are treated as-is (i.e., there is no quoting, |
| 802 | and one cannot transmit a value with newline or NUL in it). The list of |
| 803 | attributes is terminated by a blank line or end-of-file.</p></div> |
| 804 | <div class="paragraph"><p>Git will send the following attributes (but may not send all of |
| 805 | them for a given credential; for example, a <tt>host</tt> attribute makes no |
| 806 | sense when dealing with a non-network protocol):</p></div> |
| 807 | <div class="dlist"><dl> |
| 808 | <dt class="hdlist1"> |
| 809 | <tt>protocol</tt> |
| 810 | </dt> |
| 811 | <dd> |
| 812 | <p> |
| 813 | The protocol over which the credential will be used (e.g., |
| 814 | <tt>https</tt>). |
| 815 | </p> |
| 816 | </dd> |
| 817 | <dt class="hdlist1"> |
| 818 | <tt>host</tt> |
| 819 | </dt> |
| 820 | <dd> |
| 821 | <p> |
| 822 | The remote hostname for a network credential. |
| 823 | </p> |
| 824 | </dd> |
| 825 | <dt class="hdlist1"> |
| 826 | <tt>path</tt> |
| 827 | </dt> |
| 828 | <dd> |
| 829 | <p> |
| 830 | The path with which the credential will be used. E.g., for |
| 831 | accessing a remote https repository, this will be the |
| 832 | repository’s path on the server. |
| 833 | </p> |
| 834 | </dd> |
| 835 | <dt class="hdlist1"> |
| 836 | <tt>username</tt> |
| 837 | </dt> |
| 838 | <dd> |
| 839 | <p> |
| 840 | The credential’s username, if we already have one (e.g., from a |
| 841 | URL, from the user, or from a previously run helper). |
| 842 | </p> |
| 843 | </dd> |
| 844 | <dt class="hdlist1"> |
| 845 | <tt>password</tt> |
| 846 | </dt> |
| 847 | <dd> |
| 848 | <p> |
| 849 | The credential’s password, if we are asking it to be stored. |
| 850 | </p> |
| 851 | </dd> |
| 852 | </dl></div> |
| 853 | <div class="paragraph"><p>For a <tt>get</tt> operation, the helper should produce a list of attributes |
| 854 | on stdout in the same format. A helper is free to produce a subset, or |
| 855 | even no values at all if it has nothing useful to provide. Any provided |
| 856 | attributes will overwrite those already known about by git.</p></div> |
| 857 | <div class="paragraph"><p>For a <tt>store</tt> or <tt>erase</tt> operation, the helper’s output is ignored. |
| 858 | If it fails to perform the requested operation, it may complain to |
| 859 | stderr to inform the user. If it does not support the requested |
| 860 | operation (e.g., a read-only store), it should silently ignore the |
| 861 | request.</p></div> |
| 862 | <div class="paragraph"><p>If a helper receives any other operation, it should silently ignore the |
| 863 | request. This leaves room for future operations to be added (older |
| 864 | helpers will just ignore the new requests).</p></div> |
| 865 | </div> |
| 866 | </div> |
| 867 | <div id="footnotes"><hr /></div> |
| 868 | <div id="footer"> |
| 869 | <div id="footer-text"> |
| 870 | Last updated 2011-12-21 14:30:17 PDT |
| 871 | </div> |
| 872 | </div> |
| 873 | </body> |
| 874 | </html> |
