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authorErlang/OTP <[email protected]>2018-02-21 15:09:47 +0100
committerErlang/OTP <[email protected]>2018-02-21 15:09:47 +0100
commit3024332c70e90eb0a6ee07eebc09647a4160a5b3 (patch)
tree58b2461ecb66226a27190a3517375762cba3db81 /lib
parenta17e29513b992afe82d7cdfdd3c880158ad0d80a (diff)
parented01a9d3f2614933d05e7d85b4bb3568c4e04cdb (diff)
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Merge branch 'hans/ssh/limit_knownhosts/OTP-14935' into maint-20
* hans/ssh/limit_knownhosts/OTP-14935: ssh: Add option save_accepted_host
Diffstat (limited to 'lib')
-rw-r--r--lib/ssh/doc/src/ssh.xml12
-rw-r--r--lib/ssh/src/ssh_options.erl6
-rw-r--r--lib/ssh/src/ssh_transport.erl5
-rw-r--r--lib/ssh/test/ssh_options_SUITE.erl37
4 files changed, 57 insertions, 3 deletions
diff --git a/lib/ssh/doc/src/ssh.xml b/lib/ssh/doc/src/ssh.xml
index 337f4094cc..acf94ff6af 100644
--- a/lib/ssh/doc/src/ssh.xml
+++ b/lib/ssh/doc/src/ssh.xml
@@ -227,6 +227,18 @@
</item>
</list>
</item>
+
+ <tag><c><![CDATA[{save_accepted_host, boolean()}]]></c></tag>
+ <item>
+ <p>If <c>true</c>, the client saves an accepted host key to avoid the
+ accept question the next time the same host is connected. If the option
+ <c>key_cb</c> is not present, the key is saved in the file "known_hosts".
+ </p>
+ <p>If <c>false</c>, the key is not saved and the key will still be unknown
+ at the next access of the same host.
+ </p>
+ </item>
+
<tag><c><![CDATA[{user_interaction, boolean()}]]></c></tag>
<item>
<p>If <c>false</c>, disables the client to connect to the server
diff --git a/lib/ssh/src/ssh_options.erl b/lib/ssh/src/ssh_options.erl
index 68c99743ee..cf1534bd78 100644
--- a/lib/ssh/src/ssh_options.erl
+++ b/lib/ssh/src/ssh_options.erl
@@ -439,6 +439,12 @@ default(client) ->
class => user_options
},
+ {save_accepted_host, def} =>
+ #{default => true,
+ chk => fun erlang:is_boolean/1,
+ class => user_options
+ },
+
{pref_public_key_algs, def} =>
#{default => ssh_transport:default_algorithms(public_key),
chk => fun check_pref_public_key_algs/1,
diff --git a/lib/ssh/src/ssh_transport.erl b/lib/ssh/src/ssh_transport.erl
index 154894cda8..a7f4854b4b 100644
--- a/lib/ssh/src/ssh_transport.erl
+++ b/lib/ssh/src/ssh_transport.erl
@@ -889,10 +889,13 @@ known_host_key(#ssh{opts = Opts, key_cb = {KeyCb,KeyCbOpts}, peer = {PeerName,_}
{_,true} ->
ok;
{_,false} ->
+ DoAdd = ?GET_OPT(save_accepted_host, Opts),
case accepted_host(Ssh, PeerName, Public, Opts) of
- true ->
+ true when DoAdd == true ->
{_,R} = add_host_key(KeyCb, PeerName, Public, [{key_cb_private,KeyCbOpts}|UserOpts]),
R;
+ true when DoAdd == false ->
+ ok;
false ->
{error, rejected_by_user};
{error,E} ->
diff --git a/lib/ssh/test/ssh_options_SUITE.erl b/lib/ssh/test/ssh_options_SUITE.erl
index e1357c3a18..bb09ca4c8b 100644
--- a/lib/ssh/test/ssh_options_SUITE.erl
+++ b/lib/ssh/test/ssh_options_SUITE.erl
@@ -70,7 +70,8 @@
hostkey_fingerprint_check_sha256/1,
hostkey_fingerprint_check_sha384/1,
hostkey_fingerprint_check_sha512/1,
- hostkey_fingerprint_check_list/1
+ hostkey_fingerprint_check_list/1,
+ save_accepted_host_option/1
]).
%%% Common test callbacks
@@ -124,6 +125,7 @@ all() ->
id_string_own_string_server,
id_string_own_string_server_trail_space,
id_string_random_server,
+ save_accepted_host_option,
{group, hardening_tests}
].
@@ -211,7 +213,8 @@ init_per_testcase(_TestCase, Config) ->
end_per_testcase(TestCase, Config) when TestCase == server_password_option;
TestCase == server_userpassword_option;
TestCase == server_pwdfun_option;
- TestCase == server_pwdfun_4_option ->
+ TestCase == server_pwdfun_4_option ;
+ TestCase == save_accepted_host_option ->
UserDir = filename:join(proplists:get_value(priv_dir, Config), nopubkey),
ssh_test_lib:del_dirs(UserDir),
end_per_testcase(Config);
@@ -1316,6 +1319,36 @@ try_to_connect(Connect, Host, Port, Pid, Tref, N) ->
end.
%%--------------------------------------------------------------------
+save_accepted_host_option(Config) ->
+ PrivDir = proplists:get_value(priv_dir, Config),
+ UserDir = filename:join(PrivDir, nopubkey), % to make sure we don't use public-key-auth
+ KnownHosts = filename:join(UserDir, "known_hosts"),
+ file:make_dir(UserDir),
+ file:delete(KnownHosts),
+ SysDir = proplists:get_value(data_dir, Config),
+ {Pid, Host, Port} = ssh_test_lib:daemon([{system_dir, SysDir},
+ {user_dir, UserDir},
+ {user_passwords, [{"vego", "morot"}]}
+ ]),
+ {error,enoent} = file:read_file(KnownHosts),
+
+ {ok,_C1} = ssh:connect(Host, Port, [{silently_accept_hosts, true},
+ {user, "vego"},
+ {password, "morot"},
+ {user_interaction, false},
+ {save_accepted_host, false},
+ {user_dir, UserDir}]),
+ {error,enoent} = file:read_file(KnownHosts),
+
+ {ok,_C2} = ssh:connect(Host, Port, [{silently_accept_hosts, true},
+ {user, "vego"},
+ {password, "morot"},
+ {user_interaction, false},
+ {user_dir, UserDir}]),
+ {ok,_} = file:read_file(KnownHosts),
+ ssh:stop_daemon(Pid).
+
+%%--------------------------------------------------------------------
%% Internal functions ------------------------------------------------
%%--------------------------------------------------------------------