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authorHans Nilsson <[email protected]>2018-10-12 12:39:07 +0200
committerHans Nilsson <[email protected]>2018-10-24 10:11:20 +0200
commit6213652225bca4199bae301041f2b56d21b4eed4 (patch)
treefd14331c42da8fa9d3ee8648692daa2d883ca1cc /lib/ssh/doc/src/ssh_file.xml
parentf7daea8abf0626e8e4df1c260223aa76c21f64b8 (diff)
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ssh: Add reference manual page for the ssh_file module
This callback module has the knowledge about the different files used by Erlang/OTP SSH. It was unfortunatly not documented previously.
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+<?xml version="1.0" encoding="utf-8" ?>
+<!DOCTYPE erlref SYSTEM "erlref.dtd">
+
+<erlref>
+ <header>
+ <copyright>
+ <year>2018</year><year>2018</year>
+ <holder>Ericsson AB. All Rights Reserved.</holder>
+ </copyright>
+ <legalnotice>
+ Licensed under the Apache License, Version 2.0 (the "License");
+ you may not use this file except in compliance with the License.
+ You may obtain a copy of the License at
+
+ http://www.apache.org/licenses/LICENSE-2.0
+
+ Unless required by applicable law or agreed to in writing, software
+ distributed under the License is distributed on an "AS IS" BASIS,
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ See the License for the specific language governing permissions and
+ limitations under the License.
+
+ </legalnotice>
+
+ <title>ssh_file</title>
+ <prepared></prepared>
+ <docno></docno>
+ <date></date>
+ <rev></rev>
+ </header>
+ <module>ssh_file</module>
+ <modulesummary>Default callback module for the client's and server's database operations in the ssh application</modulesummary>
+ <description>
+ <p>This module is the default callback handler for the client's and the server's user and host "database" operations.
+ </p>
+ <p>
+ The intention is to be compatible with the OpenSSH storage in files. Therefore it mimics directories and filenames
+ of OpenSSH.
+ </p>
+ <note>
+ <p>The functions are <i>Callbacks</i> for the SSH app. They are not intended to be called from the user's code!
+ </p>
+ </note>
+ </description>
+ <section>
+ <title>Making your own callback module</title>
+ <p>Ssh_file implements the <seealso marker="ssh:ssh_server_key_api">ssh_server_key_api</seealso> and
+ <seealso marker="ssh:ssh_client_key_api">ssh_client_key_api</seealso>.
+ This enables the user to make an own interface using for example a database handler.
+ </p>
+ <p>Such another callback module could be used by setting the option
+ <seealso marker="ssh:ssh#type-key_cb_common_option"><c>key_cb</c></seealso>
+ when starting a client or a server (with for example
+ <seealso marker="ssh:ssh#connect-3">ssh:connect</seealso>,
+ <seealso marker="ssh:ssh#daemon-2">ssh:daemon</seealso> of
+ <seealso marker="ssh:ssh#shell-1">ssh:shell</seealso>
+ ).
+ </p>
+ </section>
+
+ <section>
+ <title>Files, directories and conventions</title>
+ <taglist>
+ <!--tag><marker id="REMOTEUSER"/>REMOTEUSER</tag>
+ <item>The user name sent by the client to the server.
+ <p/></item-->
+
+ <tag><marker id="LOCALUSER"/>LOCALUSER</tag>
+ <item>The user name of the OS process running the Erlang virtual machine (emulator).
+ <p/></item>
+
+ <tag><marker id="SYSDIR"/>SYSDIR</tag>
+ <item>SYSDIR is the directory holding the server's files:
+ <list>
+ <item><marker id="SYSDIR-ssh_host_dsa_key"/><c>ssh_host_dsa_key</c> - private dss host key (optional)</item>
+ <item><marker id="SYSDIR-ssh_host_rsa_key"/><c>ssh_host_rsa_key</c> - private rsa host key (optional)</item>
+ <item><marker id="SYSDIR-ssh_host_ecdsa_key"/><c>ssh_host_ecdsa_key</c> - private ecdsa host key (optional)</item>
+ </list>
+ <p>At least one host key must be defined. The default value of SYSDIR is <marker id="#/etc/ssh"/><c>/etc/ssh</c>.
+ </p>
+ </item>
+
+ <tag><marker id="USERDIR"/>USERDIR</tag>
+ <item>USERDIR is the directory holding the files:
+ <list>
+ <item><marker id="USERDIR-authorized_keys"/><c>authorized_keys</c> - list of keys allowed in public_key authorization (optional)</item>
+ <item><marker id="USERDIR-authorized_keys2"/><c>authorized_keys2</c> - list of keys allowed in public_key authorization (optional and unusual)</item>
+ <item><marker id="USERDIR-known_hosts"/><c>known_hosts</c> - list of hosts visited (created by the client)</item>
+ <item><marker id="USERDIR-id_dsa"/><c>id_dsa</c> - private dss user key (optional)</item>
+ <item><marker id="USERDIR-id_rsa"/><c>id_rsa</c> - private rsa user key (optional)</item>
+ <item><marker id="USERDIR-id_ecdsa"/><c>id_ecdsa</c> - private ecdsa user key (optional)</item>
+ </list>
+ <p>The default value of USERDIR is <c>/home/</c><seealso marker="#LOCALUSER"><c>LOCALUSER</c></seealso><c>/.ssh</c>.
+ See also the <seealso marker="ssh:ssh#type-user_dir_common_option">user_dir</seealso> common option.
+ </p></item>
+
+ </taglist>
+ </section>
+
+ <funcs>
+ <func>
+ <name>host_key(Algorithm, DaemonOptions) -> {ok, Key} | {error, Reason}</name>
+ <fsummary></fsummary>
+ <desc>
+ <p><strong>Types and description</strong></p>
+ <p>See the api description in
+ <seealso marker="ssh:ssh_server_key_api#Module:host_key-2">ssh_server_key_api, Module:host_key/2</seealso>.
+ </p>
+ <p><strong>Options</strong></p>
+ <list>
+ <item><c>{system_dir, </c><seealso marker="#SYSDIR">SYSDIR</seealso><c>}</c></item>
+ <!-- item>dsa_pass_phrase</item -->
+ <!-- item>rsa_pass_phrase</item -->
+ <!-- item>ecdsa_pass_phrase</item -->
+ </list>
+ <p><strong>Files</strong></p>
+ <list>
+ <item><seealso marker="#SYSDIR-ssh_host_rsa_key"><c>SYSDIR/ssh_host_rsa_key</c></seealso></item>
+ <item><seealso marker="#SYSDIR-ssh_host_dsa_key"><c>SYSDIR/ssh_host_dsa_key</c></seealso></item>
+ <item><seealso marker="#SYSDIR-ssh_host_ecdsa_key"><c>SYSDIR/ssh_host_ecdsa_key</c></seealso></item>
+ </list>
+ <p>&nbsp;</p>
+ </desc>
+ </func>
+
+ <func>
+ <name>is_auth_key(PublicUserKey, User, DaemonOptions) -> Result</name>
+ <fsummary></fsummary>
+ <desc>
+ <p><strong>Types and description</strong></p>
+ <p>See the api description in
+ <seealso marker="ssh:ssh_server_key_api#Module:is_auth_key-3">ssh_server_key_api: Module:is_auth_key/3</seealso>.
+ </p>
+ <p><strong>Options</strong></p>
+ <list>
+ <item><marker id="user_dir_fun"/><c>{user_dir_fun, fun(RemoteUser) -> USERDIR end}</c></item>
+ <item><c>{user_dir, </c><seealso marker="#USERDIR"><c>USERDIR</c></seealso><c>}</c></item>
+ </list>
+ <p><strong>Files</strong></p>
+ <list>
+ <item><seealso marker="#USERDIR-authorized_keys"><c>USERDIR/authorized_keys</c></seealso></item>
+ <item><seealso marker="#USERDIR-authorized_keys2"><c>USERDIR/authorized_keys2</c></seealso></item>
+ </list>
+ <p>&nbsp;</p>
+ </desc>
+ </func>
+
+ <func>
+ <name>add_host_key(HostNames, PublicHostKey, ConnectOptions) -> ok | {error, Reason}</name>
+ <fsummary></fsummary>
+ <desc>
+ <p><strong>Types and description</strong></p>
+ <p>See the api description in
+ <seealso marker="ssh:ssh_client_key_api#Module:add_host_key-3">ssh_client_key_api, Module:add_host_key/3</seealso>.
+ </p>
+ <p><strong>Option</strong></p>
+ <list>
+ <item><c>{user_dir, </c><seealso marker="#USERDIR"><c>USERDIR</c></seealso><c>}</c></item>
+ </list>
+ <p><strong>File</strong></p>
+ <list>
+ <item><seealso marker="#USERDIR-known_hosts"><c>USERDIR/known_hosts</c></seealso></item>
+ </list>
+ <p>&nbsp;</p>
+ </desc>
+ </func>
+
+ <func>
+ <name>is_host_key(Key, Host, Algorithm, ConnectOptions) -> Result</name>
+ <fsummary></fsummary>
+ <desc>
+ <p><strong>Types and description</strong></p>
+ <p>See the api description in
+ <seealso marker="ssh:ssh_client_key_api#Module:is_host_key-4">ssh_client_key_api, Module:is_host_key/4</seealso>.
+ </p>
+ <p><strong>Option</strong></p>
+ <list>
+ <item><c>{user_dir, </c><seealso marker="#USERDIR"><c>USERDIR</c></seealso><c>}</c></item>
+ </list>
+ <p><strong>File</strong></p>
+ <list>
+ <item><seealso marker="#USERDIR-known_hosts"><c>USERDIR/known_hosts</c></seealso></item>
+ </list>
+ <p>&nbsp;</p>
+ </desc>
+ </func>
+
+ <func>
+ <name>user_key(Algorithm, ConnectOptions) -> {ok, PrivateKey} | {error, Reason}</name>
+ <fsummary></fsummary>
+ <desc>
+ <p><strong>Types and description</strong></p>
+ <p>See the api description in
+ <seealso marker="ssh:ssh_client_key_api#Module:user_key-2">ssh_client_key_api, Module:user_key/2</seealso>.
+ </p>
+ <p><strong>Options</strong></p>
+ <list>
+ <item><c>{user_dir, </c><seealso marker="#USERDIR"><c>USERDIR</c></seealso><c>}</c></item>
+ <item><seealso marker="ssh:ssh#type-pubkey_passphrase_client_options"><c>{dsa_pass_phrase, PWD}</c></seealso></item>
+ <item><seealso marker="ssh:ssh#type-pubkey_passphrase_client_options"><c>{rsa_pass_phrase, PWD}</c></seealso></item>
+ <item><seealso marker="ssh:ssh#type-pubkey_passphrase_client_options"><c>{ecdsa_pass_phrase, PWD}</c></seealso></item>
+ </list>
+ <p><strong>Files</strong></p>
+ <list>
+ <item><seealso marker="#USERDIR-id_dsa"><c>USERDIR/id_dsa</c></seealso></item>
+ <item><seealso marker="#USERDIR-id_rsa"><c>USERDIR/id_rsa</c></seealso></item>
+ <item><seealso marker="#USERDIR-id_ecdsa"><c>USERDIR/id_ecdsa</c></seealso></item>
+ </list>
+ </desc>
+ </func>
+
+ </funcs>
+
+</erlref>