doc/manual.docbook
author Paul Crowley <paul@lshift.net>
Thu, 15 Oct 2009 12:19:35 +0100
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child 159 609d1d4ec773
permissions -rw-r--r--
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<?xml version="1.0" encoding="utf-8"?>
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<article xmlns="http://docbook.org/ns/docbook" version="5.0" xml:lang="en"
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  xmlns:xlink="http://www.w3.org/1999/xlink">
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<info>
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  <title>Sharing Mercurial repositories with mercurial-server</title>
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  <author><firstname>Paul</firstname><surname>Crowley</surname></author>
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  <copyright><year>2009</year><holder>Paul Crowley, LShift Ltd</holder></copyright>
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</info>
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<section>
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<title>About mercurial-server</title>
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<para>
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Home page: <link xlink:href="http://www.lshift.net/mercurial-server.html"/>
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</para>
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<para>
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mercurial-server gives your developers remote read/write access to
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centralized <link xlink:href="http://hg-scm.org/">Mercurial</link>
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repositories using SSH public key authentication; it provides convenient
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and fine-grained key management and access control.
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</para>
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<para>
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Though mercurial-server is currently targeted at Debian-based systems such
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as Ubuntu, other users have reported success getting it running on other
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Unix-based systems such as Red Hat. Running it on a non-Unix system such as
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Windows is not supported. You will need root privileges to install it.
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</para>
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</section>
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<section>
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<title>Step by step</title>
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<para>
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mercurial-server authenticates users not using passwords but using SSH
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public keys; everyone who wants access to a mercurial-server repository
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will need such a key. In combination with <command>ssh-agent</command> (or
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equivalents such as the Windows program <link
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xlink:href="http://the.earth.li/~sgtatham/putty/0.60/htmldoc/Chapter9.html#pageant">Pageant</link>),
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this means that users will not need to type in a password to access the
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repository. If you're not familiar with SSH public keys, the <link
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xlink:href="http://sial.org/howto/openssh/publickey-auth/">OpenSSH Public
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Key Authentication tutorial</link> may be helpful.
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</para>
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<section>
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<title>Installing mercurial-server</title>
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<para>
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In what follows, we assume that your username is <systemitem
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class="username">jay</systemitem>, that you usually sit at a machine called
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<systemitem class="systemname">spoon</systemitem> and you wish to
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install mercurial-server on <systemitem
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class="systemname">jeeves</systemitem>. We assume that you have created your SSH public key, set up your SSH agent with this key, and that this key gives you access to <systemitem
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class="systemname">jeeves</systemitem>.  
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</para>
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<para>First install mercurial-server on <systemitem
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class="systemname">jeeves</systemitem>:</para>
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<screen><computeroutput>jay@spoon:~$ </computeroutput><userinput>scp mercurial-server_0.6.1_amd64.deb jeeves:</userinput>
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<computeroutput>mercurial-server_0.6.1_amd64.deb 100%
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jay@spoon:~$ </computeroutput><userinput>ssh -A jeeves</userinput>
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<computeroutput>jay@jeeves:~$ </computeroutput><userinput>sudo dpkg -i mercurial-server_0.6.1_amd64.deb</userinput>
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<computeroutput>[sudo] password for jay: 
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Selecting previously deselected package mercurial-server.
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(Reading database ... 144805 files and directories currently installed.)
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Unpacking mercurial-server (from .../mercurial-server_0.6.1_amd64.deb) ...
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Setting up mercurial-server (0.6.1) ...
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jay@jeeves:~$ </computeroutput></screen>
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<para>
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mercurial-server is now installed on the repository host.  Next, we need to give you permission to access its repositories.
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</para>
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<screen><computeroutput>jay@jeeves:~$ </computeroutput><userinput>ssh-add -L > my-key</userinput>
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<computeroutput>jay@jeeves:~$ </computeroutput><userinput>sudo mkdir -p /etc/mercurial-server/keys/root/jay</userinput>
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<computeroutput>jay@jeeves:~$ </computeroutput><userinput>sudo cp my-key /etc/mercurial-server/keys/root/jay/spoon</userinput>
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<computeroutput>jay@jeeves:~$ </computeroutput><userinput>sudo -u hg /usr/share/mercurial-server/refresh-auth</userinput>
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<computeroutput>jay@jeeves:~$ </computeroutput><userinput>exit</userinput>
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<computeroutput>Connection to jeeves closed.
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jay@spoon:~$ </computeroutput></screen>
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<para>
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You can now create repositories on the remote machine and have complete
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read-write access to all of them.
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</para>
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</section>
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<section>
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<title>Creating repositories</title>
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<para>
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To store a repository on the server, clone it over.
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</para>
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<screen><computeroutput>jay@spoon:~$ </computeroutput><userinput>cd my-mercurial-project</userinput>
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<computeroutput>jay@spoon:~/my-mercurial-project$ </computeroutput><userinput>hg clone . ssh://hg@jeeves/repository/name</userinput>
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<computeroutput>searching for changes
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remote: adding changesets
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remote: adding manifests
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remote: adding file changes
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remote: added 119 changesets with 284 changes to 61 files
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jay@spoon:~/my-mercurial-project$ </computeroutput><userinput>hg pull ssh://hg@jeeves/repository/name</userinput>
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<computeroutput>pulling from ssh://hg@jeeves/repository/name
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searching for changes
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no changes found
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<computeroutput>jay@spoon:~/my-mercurial-project$ </computeroutput><userinput>cd ..</userinput>
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jay@spoon:~$ </computeroutput></screen>
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</section>
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<section>
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<title>Adding other users</title>
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<para>
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At this stage, no-one but you has any access to any repositories you
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create on this system. In order to give anyone else access, you'll need a
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copy of their SSH public key; we'll assume you have that key in
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<filename>~/sam-key.pub</filename>.  To manage access, you make changes to the special <filename
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class='directory'>hgadmin</filename> repository.
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</para>
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<screen><computeroutput>jay@spoon:~$ </computeroutput><userinput>hg clone ssh://hg@jeeves/hgadmin</userinput>
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<computeroutput>destination directory: hgadmin
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no changes found
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updating working directory
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0 files updated, 0 files merged, 0 files removed, 0 files unresolved
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jay@spoon:~$ </computeroutput><userinput>cd hgadmin</userinput>
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<computeroutput>jay@spoon:~/hgadmin$ </computeroutput><userinput>mkdir -p keys/users/sam</userinput>
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<computeroutput>jay@spoon:~/hgadmin$ </computeroutput><userinput>cp ~/sam-key.pub keys/users/sam/their-workstation</userinput>
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<computeroutput>jay@spoon:~/hgadmin$ </computeroutput><userinput>hg add</userinput>
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<computeroutput>adding keys/users/sam/their-workstation
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jay@spoon:~/hgadmin$ </computeroutput><userinput>hg commit -m "Add Sam's key'"</userinput>
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<computeroutput>jay@spoon:~/hgadmin$ </computeroutput><userinput>hg push</userinput>
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<computeroutput>pushing to ssh://hg@jeeves/hgadmin
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searching for changes
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remote: adding changesets
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remote: adding manifests
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remote: adding file changes
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remote: added 1 changesets with 1 changes to 1 files
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jay@spoon:~/hgadmin$ </computeroutput></screen>
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<para>
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Sam can now read and write to your
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<uri>ssh://hg@jeeves/repository/name</uri> repository.
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Most other changes to access control can be made simply by making and
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pushing changes to <filename
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class='directory'>hgadmin</filename>, and you can use Mercurial to
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cooperate with other root users in the normal way.
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</para>
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<para>
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If you prefer, you could give them access by
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logging into <systemitem class="systemname">jeeves</systemitem>,
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putting the key in the right place under <filename
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class='directory'>/etc/mercurial-server/keys</filename>, and re-running
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<userinput>sudo -u hg /usr/share/mercurial-server/refresh-auth</userinput>.
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However, using <filename
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class='directory'>hgadmin</filename> is usually more convenient if you need to make more than a very few changes; it also makes it easier to share administration with others and provides a log of all changes.
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</para>
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</section>
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</section>
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<section>
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<title>Access control</title>
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<para>
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Out of the box, mercurial-server supports two kinds of users: "root" users and normal users.  If you followed the steps above, you are a "root" user because your key is under <filename class='directory'>keys/root</filename>, while the other user you gave access to is a normal user since their key is under <filename class='directory'>keys/users</filename>.  Keys that are not in either of these directories will by default have no access to anything.
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</para>
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<para>
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Root users can edit <filename
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class='directory'>hgadmin</filename>, create new repositories and read and write to existing ones.  Normal users cannot access <filename
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class='directory'>hgadmin</filename> or create new repositories, but they can read and write to any other repository.
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</para>
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<section>
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<title>Using access.conf</title>
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<para>
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mercurial-server offers much more fine-grained access control than this division into two classes of users.  Let's suppose you wish to give Pat access to the <filename
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class='directory'>widget</filename> repository, but no other.  We first copy Pat's SSH public key into the <filename
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class='directory'>keys/pat</filename> directory in <filename
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class='directory'>hgadmin</filename>.  This tells mercurial-server about Pat's key, but gives Pat no access to anything because the key is not under either <filename
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class='directory'>keys/root</filename> or <filename
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class='directory'>keys/users</filename>.  To grant this key access, we must give mercurial-server a new access rule, so we create a file in <filename
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class='directory'>hgadmin</filename> called <filename>access.conf</filename>, with the following contents:</para>
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<programlisting># Give Pat access to the "widget" repository
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write repo=widget user=pat
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</programlisting>
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<para>
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Pat will have read and write access to the <filename
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class='directory'>widget</filename> repository as soon as we add, commit, and push these files.
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</para>
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<para>
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Each line of <filename>access.conf</filename> has the following syntax:
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</para>
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<programlisting><replaceable>rule</replaceable> <replaceable>condition</replaceable> <replaceable>condition...</replaceable>
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</programlisting>
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<para>
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Blank lines and lines that start with <code>#</code> are ignored. Rule is
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one of
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</para>
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<itemizedlist>
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<listitem>
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<literal>init</literal>: allow reads, writes, and the creation of new repositories
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</listitem>
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<listitem>
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<literal>write</literal>: allow reads and writes
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</listitem>
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<listitem>
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<literal>read</literal>: allow only read operations
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</listitem>
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<listitem>
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<literal>deny</literal>: deny all requests
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</listitem>
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</itemizedlist>
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<para>
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A condition is a globpattern matched against a relative path. The two most
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important conditions are
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</para>
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<itemizedlist>
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<listitem>
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<code>user=<replaceable>globpattern</replaceable></code>: path to the user's key
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</listitem>
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<listitem>
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<code>repo=<replaceable>globpattern</replaceable></code>: path to the repository
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</listitem>
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</itemizedlist>
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<para>
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<code>*</code> only matches one directory level, where <code>**</code>
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matches as many as you want. More precisely, <code>*</code> matches zero or
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more characters not including <code>/</code> while <code>**</code> matches
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zero or more characters including <code>/</code>. So
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<code>projects/*</code> matches <filename
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class='directory'>projects/foo</filename> but not <filename
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class='directory'>projects/foo/bar</filename>, while
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<code>projects/**</code> matches both.
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</para>
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<para>
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When considering a request, mercurial-server steps through all the rules in
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<filename>/etc/mercurial-server/access.conf</filename> and then all the
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rules in <filename>access.conf</filename> in <filename
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class='directory'>hgadmin</filename>
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looking for a rule which matches on every condition. The first match
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determines whether the request will be allowed; if there is no match in
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either file, the request will be denied.
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</para>
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<para>
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By default, <filename>/etc/mercurial-server/access.conf</filename> has the
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following rules:
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</para>
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<programlisting>init user=root/**
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deny repo=hgadmin
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write user=users/**
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</programlisting>
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<para>
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These rules ensure that root users can do any operation on any repository,
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that no other users can access the <filename
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class='directory'>hgadmin</filename> repository,
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and that those with keys in <filename
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class='directory'>keys/users</filename> can read or write to any repository
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but not create repositories.  Some examples of how these rules work:
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</para>
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<itemizedlist>
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<listitem>
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User <filename class='directory'>root/jay</filename> creates a repository
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<filename class='directory'>foo/bar/baz</filename>. This matches the first
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rule and so will be allowed.
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</listitem>
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<listitem>
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User <filename class='directory'>root/jay</filename> changes repository
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<filename class='directory'>hgadmin</filename>. Again, this matches the
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first rule and so will be allowed; later rules have no effect.
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</listitem>
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<listitem>
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User <filename class='directory'>users/sam</filename> tries to read
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repository <filename class='directory'>hgadmin</filename>. This does not
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match the first rule, but matches the second, and so will be denied.
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</listitem>
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<listitem>
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User <filename class='directory'>users/sam</filename> tries to create
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repository <filename class='directory'>sams-project</filename>. This does
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not match the first two rules, but matches the third; this is a
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<literal>write</literal> rule, which doesn't grant the privilege to create
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repositories, so the request will be denied.
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</listitem>
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<listitem>
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User <filename class='directory'>users/sam</filename> writes to existing
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repository <filename class='directory'>projects/main</filename>. Again,
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this matches the third rule, which allows the request.
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</listitem>
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<listitem>
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User <filename class='directory'>pat</filename> tries to write to existing
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repository <filename class='directory'>widget</filename>. Until we change
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the <filename>access.conf</filename> file in <filename
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class='directory'>hgadmin</filename>, this will match no rule, and so will
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be denied.
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</listitem>
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<listitem>
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Any request from a user whose key not under the <filename
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class='directory'>keys</filename> directory at all will always be denied,
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no matter what rules are in effect; because of the way SSH authentication
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works, they will be prompted to enter a password, but no password will
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work. This can't be changed.
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</listitem>
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</itemizedlist>
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</section>
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<section>
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<title>/etc/mercurial-server and hgadmin</title>
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<para>
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mercurial-server consults two distinct locations to collect information about what to allow: <filename
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class='directory'>/etc/mercurial-server</filename> and its own <filename
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class='directory'>hgadmin</filename> repository.  This is useful for several reasons:
125
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</para>
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<itemizedlist>
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<listitem>
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Some users may not need the convenience of access control via mercurial; for these users updating <filename
125
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class='directory'>/etc/mercurial-server</filename> may offer a simpler route.
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</listitem>
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<listitem>
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<filename class='directory'>/etc/mercurial-server</filename> is suitable
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for management with tools such as <link
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xlink:href="http://reductivelabs.com/products/puppet">Puppet</link>
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</listitem>
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<listitem>
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If a change to <filename
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class='directory'>hgadmin</filename> leaves you "locked out", <filename
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class='directory'>/etc/mercurial-server</filename> allows you a way back in.
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</listitem>
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<listitem>
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At install time, all users are "locked out", and so some mechanism to allow some users in is needed.
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</listitem>
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</itemizedlist>
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<para>
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Rules in <filename>/etc/mercurial-server/access.conf</filename> are checked before those in <filename
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class='directory'>hgadmin</filename>, and keys in <filename class='directory'>/etc/mercurial-server/keys</filename> will be present no matter how <filename
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class='directory'>hgadmin</filename> changes.
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</para>
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<para>
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We anticipate that once mercurial-server is successfully installed and
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working you will usually want to use <filename
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class='directory'>hgadmin</filename> for most
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access control tasks. Once you have the right keys and
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<filename>access.conf</filename> set up in <filename
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class='directory'>hgadmin</filename>, you
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can delete <filename>/etc/mercurial-server/access.conf</filename> and all
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of <filename class='directory'>/etc/mercurial-server/keys</filename>,
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turning control entirely over to <filename
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class='directory'>hgadmin</filename>.
125
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</para>
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3262c0a53b59 Talk about remote-hgrc
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<para>
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<filename>/etc/mercurial-server/remote-hgrc</filename> is in the
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<systemitem>HGRCPATH</systemitem> for all remote access to mercurial-server
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repositories. This file contains the hooks that mercurial-server uses for
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   331
access control and logging. You can add hooks to this file, but obviously
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breaking the existing hooks will disable the relevant functionality and
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isn't advisable.
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</para>
125
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</section>
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<section>
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<title>File and branch conditions</title>
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<para>
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mercurial-server supports file and branch conditions, which restrict an
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operation depending on what files it modifies and what branch the work is
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on. </para>
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<caution>
128
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The way these conditions work is subtle and can be counterintuitive. Unless
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you need what they provide, ignore this section, stick to user and repo
140
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conditions, and then things are likely to work the way you would expect. If
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you do need what they provide, read what follows very carefully.
121
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</caution>
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<para>
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File and branch conditions are added to the conditions against which a rule
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matches, just like user and repo conditions; they have this form:
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</para>
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<itemizedlist>
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<listitem>
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<code>file=<replaceable>globpattern</replaceable></code>: file within the repo
121
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</listitem>
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   356
<listitem>
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<code>branch=<replaceable>globpattern</replaceable></code>: Mercurial branch name
121
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</listitem>
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</itemizedlist>
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<para>
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   361
However, in order to understand what effect adding these conditions will
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diff changeset
   362
have, it helps to understand how and when these rules are applied.
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   363
</para>
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   364
<para>
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   365
The rules file is used to make three decisions:
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   366
</para>
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   367
<itemizedlist>
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   368
<listitem>
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   369
Whether to allow a repository to be created
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   370
</listitem>
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   371
<listitem>
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   372
Whether to allow any access to a repository
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   373
</listitem>
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   374
<listitem>
139
b7e78f9705e6 There are only three decisions, honest
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diff changeset
   375
Whether to allow a changeset
121
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diff changeset
   376
</listitem>
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diff changeset
   377
</itemizedlist>
120
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diff changeset
   378
<para>
121
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diff changeset
   379
When the first two of these decisions are being made, nothing is known
139
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diff changeset
   380
about any changsets that might be pushed, and so all file and branch
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diff changeset
   381
conditions automatically succeed for the purpose of such decisions. For the
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diff changeset
   382
third condition, every file changed in the changeset must be allowed by a
b7e78f9705e6 There are only three decisions, honest
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diff changeset
   383
<literal>write</literal> or <literal>init</literal> rule for the changeset
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diff changeset
   384
to be allowed.
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diff changeset
   385
</para>
b7e78f9705e6 There are only three decisions, honest
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parents: 138
diff changeset
   386
<para>
b7e78f9705e6 There are only three decisions, honest
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parents: 138
diff changeset
   387
This means that doing tricky things with file conditions can have
b7e78f9705e6 There are only three decisions, honest
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diff changeset
   388
counterintuitive consequences:
121
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   389
</para>
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   390
<itemizedlist>
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parents: 120
diff changeset
   391
<listitem>
149
dc4ed4edb458 Improvements to file conditions section
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diff changeset
   392
<para>You cannot limit read access to a subset of a repository with a <literal>read</literal>
121
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diff changeset
   393
rule and a file condition: any user who has access to a repository can read
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   394
all of it and its full history. Such a rule can only have the effect of
149
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parents: 148
diff changeset
   395
masking a later <literal>write</literal> rule, as in this example:</para>
144
2dbaddde1fd5 programlisting also needs no initial blank lines
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parents: 143
diff changeset
   396
<programlisting>read repo=specialrepo file=dontwritethis
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parents: 143
diff changeset
   397
write repo=specialrepo
121
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diff changeset
   398
</programlisting>
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   399
<para>
149
dc4ed4edb458 Improvements to file conditions section
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diff changeset
   400
allows all users to read <literal>specialrepo</literal>, and to write to all files
121
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diff changeset
   401
<emphasis>except</emphasis> that any changeset which writes to
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   402
<filename>dontwritethis</filename> will be rejected.
120
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parents: 119
diff changeset
   403
</para>
121
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   404
</listitem>
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   405
<listitem>
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   406
For similar reasons, don't give <literal>init</literal> rules file conditions.
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   407
</listitem>
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   408
<listitem>
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   409
<para>Don't try to deny write access to a particular file on a particular
149
dc4ed4edb458 Improvements to file conditions section
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parents: 148
diff changeset
   410
branch&#x2014;a developer can write to the file on another branch and then merge
121
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   411
it in. Either deny all writes to the branch from that user, or allow them
149
dc4ed4edb458 Improvements to file conditions section
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parents: 148
diff changeset
   412
to write to all the files they can write to on any branch.
121
62185dc7d0c9 Document file and branch conditions in Docbook
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parents: 120
diff changeset
   413
</para>
144
2dbaddde1fd5 programlisting also needs no initial blank lines
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   414
<programlisting>write user=docs/* branch=docs file=docs/*
121
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diff changeset
   415
</programlisting>
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diff changeset
   416
<para>
149
dc4ed4edb458 Improvements to file conditions section
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   417
This rule grants users whose keys are in the <filename
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diff changeset
   418
class='directory'>docs</filename> subdirectory the power to push changesets
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diff changeset
   419
into any repository only if those changesets are on the
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   420
<literal>docs</literal> branch and they affect only those files directly
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diff changeset
   421
under the <filename class='directory'>docs</filename> directory. However,
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   422
the rules below have more counterintuitive consequences.
121
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diff changeset
   423
</para>
144
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   424
<programlisting>write user=docs/* branch=docs
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diff changeset
   425
write user=docs/* file=docs/*
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diff changeset
   426
read user=docs/*
121
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diff changeset
   427
</programlisting>
149
dc4ed4edb458 Improvements to file conditions section
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parents: 148
diff changeset
   428
<para>
dc4ed4edb458 Improvements to file conditions section
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diff changeset
   429
These rules grant users whose keys are in the <filename
dc4ed4edb458 Improvements to file conditions section
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diff changeset
   430
class='directory'>docs</filename> subdirectory the power to change any file directly under the <filename class='directory'>docs</filename> directory, or any file at all in the <literal>docs</literal> branch.  Indirectly, however, this adds up to the power to change any file on any branch, simply by making the change on the docs branch and then merging the change into another branch.
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diff changeset
   431
</para>
121
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diff changeset
   432
</listitem>
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diff changeset
   433
</itemizedlist>
120
16056a9015f3 Huge update to docbook docs
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diff changeset
   434
</section>
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diff changeset
   435
</section>
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diff changeset
   436
<section>
126
fd7ebe95d8e5 Move how it works section later
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diff changeset
   437
<title>How mercurial-server works</title>
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diff changeset
   438
<para>
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diff changeset
   439
All of the repositories controlled by mercurial-server are owned by a
151
5758cf47ff43 cleanups to the security section
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parents: 150
diff changeset
   440
single user, the <systemitem
5758cf47ff43 cleanups to the security section
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diff changeset
   441
class="username">hg</systemitem> user, which is why all URLs for
155
3bff97f72a33 ssh:// is the start of a URI
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diff changeset
   442
mercurial-server repositories start with <uri>ssh://hg@...</uri>.
126
fd7ebe95d8e5 Move how it works section later
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parents: 125
diff changeset
   443
Each SSH key that has access to the repository has an entry in
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diff changeset
   444
<filename>~hg/.ssh/authorized_keys</filename>; this is how the SSH daemon
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diff changeset
   445
knows to give that key access. When the user connects over SSH, their
150
02b464a6b433 Improvements to how it works section
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parents: 149
diff changeset
   446
commands are run in a custom restricted shell; this shell knows which key
02b464a6b433 Improvements to how it works section
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parents: 149
diff changeset
   447
was used to connect, determines what the user is trying to do, checks the
02b464a6b433 Improvements to how it works section
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parents: 149
diff changeset
   448
access rules to decide whether to allow it, and if allowed invokes
02b464a6b433 Improvements to how it works section
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parents: 149
diff changeset
   449
Mercurial internally, without forking.
126
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parents: 125
diff changeset
   450
</para>
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parents: 125
diff changeset
   451
<para>
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diff changeset
   452
This restricted shell also ensures that certain Mercurial extensions are
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diff changeset
   453
loaded when the user acts on a repository; these extensions check the
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parents: 125
diff changeset
   454
access control rules for any changeset that the user tries to commit, and
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parents: 125
diff changeset
   455
log all pushes and pulls into a per-repository access log.
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parents: 125
diff changeset
   456
</para>
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parents: 125
diff changeset
   457
<para>
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diff changeset
   458
<command>refresh-auth</command> recurses through the <filename
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parents: 125
diff changeset
   459
class='directory'>/etc/mercurial-server/keys</filename> and the <filename
fd7ebe95d8e5 Move how it works section later
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parents: 125
diff changeset
   460
class='directory'>keys</filename> directory in the
154
45dac87ae794 Repository names are directories
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parents: 153
diff changeset
   461
<filename
45dac87ae794 Repository names are directories
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parents: 153
diff changeset
   462
class='directory'>hgadmin</filename> repository, creating an entry in
126
fd7ebe95d8e5 Move how it works section later
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parents: 125
diff changeset
   463
<filename>~hg/.ssh/authorized_keys</filename> for each one. This is redone
154
45dac87ae794 Repository names are directories
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parents: 153
diff changeset
   464
automatically whenever a change is pushed to <filename
45dac87ae794 Repository names are directories
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parents: 153
diff changeset
   465
class='directory'>hgadmin</filename>.
126
fd7ebe95d8e5 Move how it works section later
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parents: 125
diff changeset
   466
</para>
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parents: 125
diff changeset
   467
</section>
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parents: 125
diff changeset
   468
<section>
120
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diff changeset
   469
<title>Security</title>
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parents: 119
diff changeset
   470
<para>
151
5758cf47ff43 cleanups to the security section
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diff changeset
   471
mercurial-server relies entirely on <command>sshd</command> to grant access to remote users.
120
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diff changeset
   472
As a result, it runs no daemons, installs no setuid programs, and no part
151
5758cf47ff43 cleanups to the security section
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parents: 150
diff changeset
   473
of it runs as <systemitem
5758cf47ff43 cleanups to the security section
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parents: 150
diff changeset
   474
class="username">root</systemitem> except the install process: all programs run as the user
5758cf47ff43 cleanups to the security section
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parents: 150
diff changeset
   475
<systemitem
5758cf47ff43 cleanups to the security section
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parents: 150
diff changeset
   476
class="username">hg</systemitem>. Any attack on mercurial-server can only be started if the attacker
137
5bcd5a5e4220 Tweak security para
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diff changeset
   477
already has a public key in <filename>~hg/.ssh/authorized_keys</filename>,
151
5758cf47ff43 cleanups to the security section
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parents: 150
diff changeset
   478
otherwise <command>sshd</command> will bar the way.
120
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parents: 119
diff changeset
   479
</para>
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parents: 119
diff changeset
   480
<para>
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parents: 119
diff changeset
   481
No matter what command the user tries to run on the remote system via SSH,
16056a9015f3 Huge update to docbook docs
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parents: 119
diff changeset
   482
mercurial-server is run. It parses the command line the user asked for, and
151
5758cf47ff43 cleanups to the security section
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parents: 150
diff changeset
   483
interprets and runs the corresponding operation itself if access is
120
16056a9015f3 Huge update to docbook docs
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diff changeset
   484
allowed, so users can only read and add to history within repositories;
151
5758cf47ff43 cleanups to the security section
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parents: 150
diff changeset
   485
they cannot run any other command. In addition, every push and pull is
120
16056a9015f3 Huge update to docbook docs
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parents: 119
diff changeset
   486
logged with a datestamp, changeset ID and the key that performed the
16056a9015f3 Huge update to docbook docs
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parents: 119
diff changeset
   487
operation.
16056a9015f3 Huge update to docbook docs
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parents: 119
diff changeset
   488
</para>
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parents: 119
diff changeset
   489
<para>
16056a9015f3 Huge update to docbook docs
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parents: 119
diff changeset
   490
However, while the first paragraph holds no matter what bugs
16056a9015f3 Huge update to docbook docs
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diff changeset
   491
mercurial-server contains, the second depends on the relevant code being
16056a9015f3 Huge update to docbook docs
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diff changeset
   492
correct; though the entire codebase is short, mercurial-server is a fairly
16056a9015f3 Huge update to docbook docs
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parents: 119
diff changeset
   493
new program and may harbour bugs. Backups are essential!
16056a9015f3 Huge update to docbook docs
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parents: 119
diff changeset
   494
</para>
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diff changeset
   495
</section>
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parents: 119
diff changeset
   496
<section>
129
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parents: 128
diff changeset
   497
<title>Legalese</title>
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parents: 128
diff changeset
   498
<para>
4d261ae3ba4f move legalese to the bottom
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diff changeset
   499
This program is free software; you can redistribute it and/or modify it
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parents: 128
diff changeset
   500
under the terms of the GNU General Public License as published by the Free
4d261ae3ba4f move legalese to the bottom
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parents: 128
diff changeset
   501
Software Foundation; either version 2 of the License, or (at your option)
4d261ae3ba4f move legalese to the bottom
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parents: 128
diff changeset
   502
any later version.
4d261ae3ba4f move legalese to the bottom
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parents: 128
diff changeset
   503
</para>
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diff changeset
   504
<para>
4d261ae3ba4f move legalese to the bottom
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diff changeset
   505
This program is distributed in the hope that it will be useful, but
4d261ae3ba4f move legalese to the bottom
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diff changeset
   506
WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
4d261ae3ba4f move legalese to the bottom
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parents: 128
diff changeset
   507
or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
4d261ae3ba4f move legalese to the bottom
Paul Crowley <paul@lshift.net>
parents: 128
diff changeset
   508
more details.
4d261ae3ba4f move legalese to the bottom
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parents: 128
diff changeset
   509
</para>
4d261ae3ba4f move legalese to the bottom
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parents: 128
diff changeset
   510
<para>
4d261ae3ba4f move legalese to the bottom
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parents: 128
diff changeset
   511
You should have received a copy of the GNU General Public License along
4d261ae3ba4f move legalese to the bottom
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parents: 128
diff changeset
   512
with this program; if not, write to the Free Software Foundation, Inc., 51
4d261ae3ba4f move legalese to the bottom
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parents: 128
diff changeset
   513
Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
4d261ae3ba4f move legalese to the bottom
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parents: 128
diff changeset
   514
</para>
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parents: 128
diff changeset
   515
</section>
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parents: 128
diff changeset
   516
<section>
120
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diff changeset
   517
<title>Thanks</title>
16056a9015f3 Huge update to docbook docs
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parents: 119
diff changeset
   518
<para>
16056a9015f3 Huge update to docbook docs
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diff changeset
   519
Thanks for reading this far. If you use mercurial-server, please tell me about
16056a9015f3 Huge update to docbook docs
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parents: 119
diff changeset
   520
it.
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parents: 119
diff changeset
   521
</para>
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parents: 119
diff changeset
   522
<para>
16056a9015f3 Huge update to docbook docs
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diff changeset
   523
Paul Crowley, <email>paul@lshift.net</email>, 2009
119
40a287c95661 Start work on a docbook manual
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parents:
diff changeset
   524
</para>
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parents:
diff changeset
   525
</section>
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parents:
diff changeset
   526
</article>
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parents:
diff changeset
   527