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-rw-r--r--lib/ssh/doc/src/introduction.xml2
-rw-r--r--lib/ssh/doc/src/ssh.xml14
-rw-r--r--lib/ssh/doc/src/ssh_protocol.xml2
-rw-r--r--lib/ssh/src/ssh.erl9
-rw-r--r--lib/ssh/src/ssh_transport.erl16
-rw-r--r--lib/ssh/test/ssh_options_SUITE.erl101
6 files changed, 131 insertions, 13 deletions
diff --git a/lib/ssh/doc/src/introduction.xml b/lib/ssh/doc/src/introduction.xml
index ca84528f3d..b7a73e2597 100644
--- a/lib/ssh/doc/src/introduction.xml
+++ b/lib/ssh/doc/src/introduction.xml
@@ -195,8 +195,6 @@
Transport Layer Protocol</item>
<item><url href="http://www.ietf.org/rfc/rfc4254.txt">RFC 4254</url> -
Connection Protocol</item>
- <item><url href="http://www.ietf.org/rfc/rfc4255.txt">RFC 4255</url> -
- Key Fingerprints</item>
<item><url href="http://www.ietf.org/rfc/rfc4344.txt">RFC 4344</url> -
Transport Layer Encryption Modes</item>
<item><url href="http://www.ietf.org/rfc/rfc4716.txt">RFC 4716</url> -
diff --git a/lib/ssh/doc/src/ssh.xml b/lib/ssh/doc/src/ssh.xml
index ef9f7cbd9b..6b49f89449 100644
--- a/lib/ssh/doc/src/ssh.xml
+++ b/lib/ssh/doc/src/ssh.xml
@@ -175,11 +175,21 @@
supplied with this option.
</p>
</item>
- <tag><c><![CDATA[{silently_accept_hosts, boolean()}]]></c></tag>
+ <tag><c><![CDATA[{silently_accept_hosts, boolean() | accept_fun() | {crypto:digest_type(), accept_fun()} }]]></c>
+ <br/>
+ <c><![CDATA[accept_fun() :: fun(PeerName::string(), FingerPrint::string()) -> boolean()]]></c>
+ </tag>
<item>
<p>When <c>true</c>, hosts are added to the
file <c><![CDATA[known_hosts]]></c> without asking the user.
- Defaults to <c>false</c>.
+ Defaults to <c>false</c> which will give a user question on stdio of whether to accept or reject a previously
+ unseen host.</p>
+ <p>If the option value is has an <c>accept_fun()</c>, that fun will called with the arguments
+ <c>(PeerName, PeerHostKeyFingerPrint)</c>. The fingerprint is calculated on the Peer's Host Key with
+ <seealso marker="public_key:public_key#ssh_hostkey_fingerprint-1">public_key:ssh_hostkey_fingerprint/1</seealso>.
+ </p>
+ <p>If the <c>crypto:digest_type()</c> is present, the fingerprint is calculated with that digest type by the function
+ <seealso marker="public_key:public_key#ssh_hostkey_fingerprint-2">public_key:ssh_hostkey_fingerprint/2</seealso>.
</p>
</item>
<tag><c><![CDATA[{user_interaction, boolean()}]]></c></tag>
diff --git a/lib/ssh/doc/src/ssh_protocol.xml b/lib/ssh/doc/src/ssh_protocol.xml
index 7288266cf7..013823b4df 100644
--- a/lib/ssh/doc/src/ssh_protocol.xml
+++ b/lib/ssh/doc/src/ssh_protocol.xml
@@ -138,8 +138,6 @@
Transport Layer Protocol.</item>
<item><url href="http://www.ietf.org/rfc/rfc4254.txt">RFC 4254</url> -
Connection Protocol.</item>
- <item><url href="http://www.ietf.org/rfc/rfc4255.txt">RFC 4255</url> -
- Key Fingerprints.</item>
<item><url href="http://www.ietf.org/rfc/rfc4344.txt">RFC 4344</url> -
Transport Layer Encryption Modes.</item>
<item><url href="http://www.ietf.org/rfc/rfc4716.txt">RFC 4716</url> -
diff --git a/lib/ssh/src/ssh.erl b/lib/ssh/src/ssh.erl
index 1d7be3547b..31e343e81b 100644
--- a/lib/ssh/src/ssh.erl
+++ b/lib/ssh/src/ssh.erl
@@ -617,6 +617,15 @@ handle_ssh_option({user_dir_fun, Value} = Opt) when is_function(Value) ->
Opt;
handle_ssh_option({silently_accept_hosts, Value} = Opt) when is_boolean(Value) ->
Opt;
+handle_ssh_option({silently_accept_hosts, Value} = Opt) when is_function(Value,2) ->
+ Opt;
+handle_ssh_option({silently_accept_hosts, {DigestAlg,Value}} = Opt) when is_function(Value,2) ->
+ case lists:member(DigestAlg, [md5, sha, sha224, sha256, sha384, sha512]) of
+ true ->
+ Opt;
+ false ->
+ throw({error, {eoptions, Opt}})
+ end;
handle_ssh_option({user_interaction, Value} = Opt) when is_boolean(Value) ->
Opt;
handle_ssh_option({preferred_algorithms,[_|_]} = Opt) ->
diff --git a/lib/ssh/src/ssh_transport.erl b/lib/ssh/src/ssh_transport.erl
index 15b80de30a..21ba34506a 100644
--- a/lib/ssh/src/ssh_transport.erl
+++ b/lib/ssh/src/ssh_transport.erl
@@ -734,12 +734,16 @@ public_algo({#'ECPoint'{},{namedCurve,OID}}) ->
list_to_atom("ecdsa-sha2-" ++ binary_to_list(Curve)).
-accepted_host(Ssh, PeerName, Opts) ->
+accepted_host(Ssh, PeerName, Public, Opts) ->
case proplists:get_value(silently_accept_hosts, Opts, false) of
+ F when is_function(F,2) ->
+ true == (catch F(PeerName, public_key:ssh_hostkey_fingerprint(Public)));
+ {DigestAlg,F} when is_function(F,2) ->
+ true == (catch F(PeerName, public_key:ssh_hostkey_fingerprint(DigestAlg,Public)));
true ->
- yes;
+ true;
false ->
- yes_no(Ssh, "New host " ++ PeerName ++ " accept")
+ yes == yes_no(Ssh, "New host " ++ PeerName ++ " accept")
end.
known_host_key(#ssh{opts = Opts, key_cb = Mod, peer = Peer} = Ssh,
@@ -749,10 +753,10 @@ known_host_key(#ssh{opts = Opts, key_cb = Mod, peer = Peer} = Ssh,
true ->
ok;
false ->
- case accepted_host(Ssh, PeerName, Opts) of
- yes ->
+ case accepted_host(Ssh, PeerName, Public, Opts) of
+ true ->
Mod:add_host_key(PeerName, Public, Opts);
- no ->
+ false ->
{error, rejected}
end
end.
diff --git a/lib/ssh/test/ssh_options_SUITE.erl b/lib/ssh/test/ssh_options_SUITE.erl
index 4cc12cbcbe..8f060bebd8 100644
--- a/lib/ssh/test/ssh_options_SUITE.erl
+++ b/lib/ssh/test/ssh_options_SUITE.erl
@@ -61,7 +61,13 @@
unexpectedfun_option_client/1,
unexpectedfun_option_server/1,
user_dir_option/1,
- connectfun_disconnectfun_server/1
+ connectfun_disconnectfun_server/1,
+ hostkey_fingerprint_check/1,
+ hostkey_fingerprint_check_md5/1,
+ hostkey_fingerprint_check_sha/1,
+ hostkey_fingerprint_check_sha256/1,
+ hostkey_fingerprint_check_sha384/1,
+ hostkey_fingerprint_check_sha512/1
]).
%%% Common test callbacks
@@ -100,6 +106,12 @@ all() ->
disconnectfun_option_client,
unexpectedfun_option_server,
unexpectedfun_option_client,
+ hostkey_fingerprint_check,
+ hostkey_fingerprint_check_md5,
+ hostkey_fingerprint_check_sha,
+ hostkey_fingerprint_check_sha256,
+ hostkey_fingerprint_check_sha384,
+ hostkey_fingerprint_check_sha512,
id_string_no_opt_client,
id_string_own_string_client,
id_string_random_client,
@@ -782,6 +794,93 @@ unexpectedfun_option_client(Config) ->
end.
%%--------------------------------------------------------------------
+hostkey_fingerprint_check(Config) ->
+ do_hostkey_fingerprint_check(Config, old).
+
+hostkey_fingerprint_check_md5(Config) ->
+ do_hostkey_fingerprint_check(Config, md5).
+
+hostkey_fingerprint_check_sha(Config) ->
+ do_hostkey_fingerprint_check(Config, sha).
+
+hostkey_fingerprint_check_sha256(Config) ->
+ do_hostkey_fingerprint_check(Config, sha256).
+
+hostkey_fingerprint_check_sha384(Config) ->
+ do_hostkey_fingerprint_check(Config, sha384).
+
+hostkey_fingerprint_check_sha512(Config) ->
+ do_hostkey_fingerprint_check(Config, sha512).
+
+
+%%%----
+do_hostkey_fingerprint_check(Config, HashAlg) ->
+ case supported_hash(HashAlg) of
+ true ->
+ really_do_hostkey_fingerprint_check(Config, HashAlg);
+ false ->
+ {skip,{unsupported_hash,HashAlg}}
+ end.
+
+supported_hash(old) -> true;
+supported_hash(HashAlg) ->
+ proplists:get_value(HashAlg,
+ proplists:get_value(hashs, crypto:supports(), []),
+ false).
+
+
+really_do_hostkey_fingerprint_check(Config, HashAlg) ->
+ PrivDir = proplists:get_value(priv_dir, Config),
+ UserDir = filename:join(PrivDir, nopubkey), % to make sure we don't use public-key-auth
+ file:make_dir(UserDir),
+ SysDir = proplists:get_value(data_dir, Config),
+
+ %% All host key fingerprints. Trust that public_key has checked the ssh_hostkey_fingerprint
+ %% function since that function is used by the ssh client...
+ FPs = [case HashAlg of
+ old -> public_key:ssh_hostkey_fingerprint(Key);
+ _ -> public_key:ssh_hostkey_fingerprint(HashAlg, Key)
+ end
+ || FileCandidate <- begin
+ {ok,KeyFileCands} = file:list_dir(SysDir),
+ KeyFileCands
+ end,
+ nomatch =/= re:run(FileCandidate, ".*\\.pub", []),
+ {Key,_Cmnts} <- begin
+ {ok,Bin} = file:read_file(filename:join(SysDir, FileCandidate)),
+ try public_key:ssh_decode(Bin, public_key)
+ catch
+ _:_ -> []
+ end
+ end],
+ ct:log("Fingerprints(~p) = ~p",[HashAlg,FPs]),
+
+ %% Start daemon with the public keys that we got fingerprints from
+ {Pid, Host, Port} = ssh_test_lib:daemon([{system_dir, SysDir},
+ {user_dir, UserDir},
+ {password, "morot"}]),
+
+ FP_check_fun = fun(PeerName, FP) ->
+ ct:pal("PeerName = ~p, FP = ~p",[PeerName,FP]),
+ HostCheck = (Host == PeerName),
+ FPCheck = lists:member(FP, FPs),
+ ct:log("check ~p == ~p (~p) and ~n~p in ~p (~p)~n",
+ [PeerName,Host,HostCheck,FP,FPs,FPCheck]),
+ HostCheck and FPCheck
+ end,
+
+ ssh_test_lib:connect(Host, Port, [{silently_accept_hosts,
+ case HashAlg of
+ old -> FP_check_fun;
+ _ -> {HashAlg, FP_check_fun}
+ end},
+ {user, "foo"},
+ {password, "morot"},
+ {user_dir, UserDir},
+ {user_interaction, false}]),
+ ssh:stop_daemon(Pid).
+
+%%--------------------------------------------------------------------
%%% Test connect_timeout option in ssh:connect/4
ssh_connect_timeout(_Config) ->
ConnTimeout = 2000,
generated by cgit v1.2.3 (git 2.25.1) at 2024-12-01 10:05:21 +0000