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-rw-r--r--lib/ssl/doc/src/ssl.xml60
-rw-r--r--lib/ssl/src/Makefile1
-rw-r--r--lib/ssl/src/ssl.app.src1
-rw-r--r--lib/ssl/src/ssl_crl_hash_dir.erl106
-rw-r--r--lib/ssl/test/make_certs.erl6
-rw-r--r--lib/ssl/test/ssl_crl_SUITE.erl201
6 files changed, 355 insertions, 20 deletions
diff --git a/lib/ssl/doc/src/ssl.xml b/lib/ssl/doc/src/ssl.xml
index a1fba5fbff..31f88f3285 100644
--- a/lib/ssl/doc/src/ssl.xml
+++ b/lib/ssl/doc/src/ssl.xml
@@ -360,15 +360,59 @@ marker="public_key:public_key#pkix_path_validation-3">public_key:pkix_path_valid
<p>Specify how to perform lookup and caching of certificate revocation lists.
<c>Module</c> defaults to <seealso marker="ssl:ssl_crl_cache">ssl_crl_cache</seealso>
with <c> DbHandle </c> being <c>internal</c> and an
- empty argument list. The following arguments may be specified for the internal cache:</p>
+ empty argument list.</p>
+
+ <p>There are two implementations available:</p>
+
<taglist>
- <tag><c>{http, timeout()}</c></tag>
- <item><p>
- Enables fetching of CRLs specified as http URIs in<seealso
- marker="public_key:public_key_records"> X509 certificate extensions.</seealso>
- Requires the OTP inets application.</p>
- </item>
- </taglist>
+ <tag><c>ssl_crl_cache</c></tag>
+ <item>
+ <p>This module maintains a cache of CRLs. CRLs can be
+ added to the cache using the function <seealso
+ marker="ssl:ssl_crl_cache#insert-1">ssl_crl_cache:insert/1</seealso>,
+ and optionally automatically fetched through HTTP if the
+ following argument is specified:</p>
+
+ <taglist>
+ <tag><c>{http, timeout()}</c></tag>
+ <item><p>
+ Enables fetching of CRLs specified as http URIs in<seealso
+ marker="public_key:public_key_records">X509 certificate extensions</seealso>.
+ Requires the OTP inets application.</p>
+ </item>
+ </taglist>
+ </item>
+
+ <tag><c>ssl_crl_hash_dir</c></tag>
+ <item>
+ <p>This module makes use of a directory where CRLs are
+ stored in files named by the hash of the issuer name.</p>
+
+ <p>The file names consist of eight hexadecimal digits
+ followed by <c>.rN</c>, where <c>N</c> is an integer,
+ e.g. <c>1a2b3c4d.r0</c>. For the first version of the
+ CRL, <c>N</c> starts at zero, and for each new version,
+ <c>N</c> is incremented by one. The OpenSSL utility
+ <c>c_rehash</c> creates symlinks according to this
+ pattern.</p>
+
+ <p>For a given hash value, this module finds all
+ consecutive <c>.r*</c> files starting from zero, and those
+ files taken together make up the revocation list. CRL
+ files whose <c>nextUpdate</c> fields are in the past, or
+ that are issued by a different CA that happens to have the
+ same name hash, are excluded.</p>
+
+ <p>The following argument is required:</p>
+
+ <taglist>
+ <tag><c>{dir, string()}</c></tag>
+ <item><p>Specifies the directory in which the CRLs can be found.</p></item>
+ </taglist>
+
+ </item>
+ </taglist>
+
</item>
<tag><c>{partial_chain, fun(Chain::[DerCert]) -> {trusted_ca, DerCert} |
diff --git a/lib/ssl/src/Makefile b/lib/ssl/src/Makefile
index 7a7a373487..b625db0656 100644
--- a/lib/ssl/src/Makefile
+++ b/lib/ssl/src/Makefile
@@ -70,6 +70,7 @@ MODULES= \
ssl_session_cache \
ssl_crl\
ssl_crl_cache \
+ ssl_crl_hash_dir \
ssl_socket \
ssl_listen_tracker_sup \
tls_record \
diff --git a/lib/ssl/src/ssl.app.src b/lib/ssl/src/ssl.app.src
index 1a2bf90ccf..5aa399201a 100644
--- a/lib/ssl/src/ssl.app.src
+++ b/lib/ssl/src/ssl.app.src
@@ -44,6 +44,7 @@
ssl_crl,
ssl_crl_cache,
ssl_crl_cache_api,
+ ssl_crl_hash_dir,
%% App structure
ssl_app,
ssl_sup,
diff --git a/lib/ssl/src/ssl_crl_hash_dir.erl b/lib/ssl/src/ssl_crl_hash_dir.erl
new file mode 100644
index 0000000000..bb62737232
--- /dev/null
+++ b/lib/ssl/src/ssl_crl_hash_dir.erl
@@ -0,0 +1,106 @@
+%%
+%% %CopyrightBegin%
+%%
+%% Copyright Ericsson AB 2016-2016. All Rights Reserved.
+%%
+%% 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.
+%%
+%% %CopyrightEnd%
+
+-module(ssl_crl_hash_dir).
+
+-include_lib("public_key/include/public_key.hrl").
+
+-behaviour(ssl_crl_cache_api).
+
+-export([lookup/3, select/2, fresh_crl/2]).
+
+lookup(#'DistributionPoint'{cRLIssuer = CRLIssuer} = DP, CertIssuer, CRLDbInfo) ->
+ Issuer =
+ case CRLIssuer of
+ asn1_NOVALUE ->
+ %% If the distribution point extension doesn't
+ %% indicate a CRL issuer, use the certificate issuer.
+ CertIssuer;
+ _ ->
+ CRLIssuer
+ end,
+ %% Find all CRLs for this issuer, and return those that match the
+ %% given distribution point.
+ AllCRLs = select(Issuer, CRLDbInfo),
+ lists:filter(fun(DER) ->
+ public_key:pkix_match_dist_point(DER, DP)
+ end, AllCRLs).
+
+fresh_crl(#'DistributionPoint'{}, CurrentCRL) ->
+ CurrentCRL.
+
+select(Issuer, {_DbHandle, [{dir, Dir}]}) ->
+ case find_crls(Issuer, Dir) of
+ [_|_] = DERs ->
+ DERs;
+ [] ->
+ %% That's okay, just report that we didn't find any CRL.
+ %% If the crl_check setting is best_effort, ssl_handshake
+ %% is happy with that, but if it's true, this is an error.
+ [];
+ {error, Error} ->
+ error_logger:error_report(
+ [{cannot_find_crl, Error},
+ {dir, Dir},
+ {module, ?MODULE},
+ {line, ?LINE}]),
+ []
+ end.
+
+find_crls(Issuer, Dir) ->
+ case filelib:is_dir(Dir) of
+ true ->
+ Hash = public_key:short_name_hash(Issuer),
+ find_crls(Issuer, Hash, Dir, 0, []);
+ false ->
+ {error, not_a_directory}
+ end.
+
+find_crls(Issuer, Hash, Dir, N, Acc) ->
+ Filename = filename:join(Dir, Hash ++ ".r" ++ integer_to_list(N)),
+ case file:read_file(Filename) of
+ {error, enoent} ->
+ Acc;
+ {ok, Bin} ->
+ try maybe_parse_pem(Bin) of
+ DER when is_binary(DER) ->
+ %% Found one file. Let's see if there are more.
+ find_crls(Issuer, Hash, Dir, N + 1, [DER] ++ Acc)
+ catch
+ error:Error ->
+ %% Something is wrong with the file. Report
+ %% it, and try the next one.
+ error_logger:error_report(
+ [{crl_parse_error, Error},
+ {filename, Filename},
+ {module, ?MODULE},
+ {line, ?LINE}]),
+ find_crls(Issuer, Hash, Dir, N + 1, Acc)
+ end
+ end.
+
+maybe_parse_pem(<<"-----BEGIN", _/binary>> = PEM) ->
+ %% It's a PEM encoded file. Need to extract the DER
+ %% encoded data.
+ [{'CertificateList', DER, not_encrypted}] = public_key:pem_decode(PEM),
+ DER;
+maybe_parse_pem(DER) when is_binary(DER) ->
+ %% Let's assume it's DER-encoded.
+ DER.
+
diff --git a/lib/ssl/test/make_certs.erl b/lib/ssl/test/make_certs.erl
index 5eebf773a7..ed1a6523ed 100644
--- a/lib/ssl/test/make_certs.erl
+++ b/lib/ssl/test/make_certs.erl
@@ -172,11 +172,15 @@ revoke(Root, CA, User, C) ->
gencrl(Root, CA, C).
gencrl(Root, CA, C) ->
+ %% By default, the CRL is valid for 24 hours from now.
+ gencrl(Root, CA, C, 24).
+
+gencrl(Root, CA, C, CrlHours) ->
CACnfFile = filename:join([Root, CA, "ca.cnf"]),
CACRLFile = filename:join([Root, CA, "crl.pem"]),
Cmd = [C#config.openssl_cmd, " ca"
" -gencrl ",
- " -crlhours 24",
+ " -crlhours ", integer_to_list(CrlHours),
" -out ", CACRLFile,
" -config ", CACnfFile],
Env = [{"ROOTDIR", filename:absname(Root)}],
diff --git a/lib/ssl/test/ssl_crl_SUITE.erl b/lib/ssl/test/ssl_crl_SUITE.erl
index 5b86027210..27005682e9 100644
--- a/lib/ssl/test/ssl_crl_SUITE.erl
+++ b/lib/ssl/test/ssl_crl_SUITE.erl
@@ -41,20 +41,26 @@ groups() ->
[
{check_true, [], [{group, v2_crl},
{group, v1_crl},
- {group, idp_crl}]},
+ {group, idp_crl},
+ {group, crl_hash_dir}]},
{check_peer, [], [{group, v2_crl},
{group, v1_crl},
- {group, idp_crl}]},
+ {group, idp_crl},
+ {group, crl_hash_dir}]},
{check_best_effort, [], [{group, v2_crl},
{group, v1_crl},
- {group, idp_crl}]},
+ {group, idp_crl},
+ {group, crl_hash_dir}]},
{v2_crl, [], basic_tests()},
{v1_crl, [], basic_tests()},
- {idp_crl, [], basic_tests()}].
+ {idp_crl, [], basic_tests()},
+ {crl_hash_dir, [], basic_tests() ++ crl_hash_dir_tests()}].
basic_tests() ->
[crl_verify_valid, crl_verify_revoked, crl_verify_no_crl].
+crl_hash_dir_tests() ->
+ [crl_hash_dir_collision, crl_hash_dir_expired].
init_per_suite(Config) ->
case os:find_executable("openssl") of
@@ -101,7 +107,24 @@ init_per_group(Group, Config0) ->
CertDir = filename:join(?config(priv_dir, Config0), Group),
{CertOpts, Config} = init_certs(CertDir, Group, Config0),
{ok, _} = make_certs:all(DataDir, CertDir, CertOpts),
- [{cert_dir, CertDir}, {idp_crl, false} | Config]
+ case Group of
+ crl_hash_dir ->
+ CrlDir = filename:join(CertDir, "crls"),
+ %% Copy CRLs to their hashed filenames.
+ %% Find the hashes with 'openssl crl -noout -hash -in crl.pem'.
+ populate_crl_hash_dir(CertDir, CrlDir,
+ [{"erlangCA", "d6134ed3"},
+ {"otpCA", "d4c8d7e5"}],
+ replace),
+ CrlCacheOpts = [{crl_cache,
+ {ssl_crl_hash_dir,
+ {internal, [{dir, CrlDir}]}}}];
+ _ ->
+ CrlCacheOpts = []
+ end,
+ [{crl_cache_opts, CrlCacheOpts},
+ {cert_dir, CertDir},
+ {idp_crl, false} | Config]
end.
end_per_group(_GroupName, Config) ->
@@ -164,9 +187,10 @@ crl_verify_valid(Config) when is_list(Config) ->
{crl_cache, {ssl_crl_cache, {internal, [{http, 5000}]}}},
{verify, verify_peer}];
false ->
- [{cacertfile, filename:join([PrivDir, "server", "cacerts.pem"])},
- {crl_check, Check},
- {verify, verify_peer}]
+ ?config(crl_cache_opts, Config) ++
+ [{cacertfile, filename:join([PrivDir, "server", "cacerts.pem"])},
+ {crl_check, Check},
+ {verify, verify_peer}]
end,
{ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),
@@ -196,9 +220,10 @@ crl_verify_revoked(Config) when is_list(Config) ->
{crl_check, Check},
{verify, verify_peer}];
false ->
- [{cacertfile, filename:join([PrivDir, "revoked", "cacerts.pem"])},
- {crl_check, Check},
- {verify, verify_peer}]
+ ?config(crl_cache_opts, Config) ++
+ [{cacertfile, filename:join([PrivDir, "revoked", "cacerts.pem"])},
+ {crl_check, Check},
+ {verify, verify_peer}]
end,
crl_verify_error(Hostname, ServerNode, ServerOpts, ClientNode, ClientOpts,
@@ -251,6 +276,132 @@ crl_verify_no_crl(Config) when is_list(Config) ->
crl_verify_valid(Hostname, ServerNode, ServerOpts, ClientNode, ClientOpts)
end.
+crl_hash_dir_collision() ->
+ [{doc,"Verify ssl_crl_hash_dir behaviour with hash collisions"}].
+crl_hash_dir_collision(Config) when is_list(Config) ->
+ PrivDir = ?config(cert_dir, Config),
+ Check = ?config(crl_check, Config),
+
+ %% Create two CAs whose names hash to the same value
+ CA1 = "hash-collision-0000000000",
+ CA2 = "hash-collision-0258497583",
+ CertsConfig = make_certs:make_config([]),
+ make_certs:intermediateCA(PrivDir, CA1, "erlangCA", CertsConfig),
+ make_certs:intermediateCA(PrivDir, CA2, "erlangCA", CertsConfig),
+
+ make_certs:enduser(PrivDir, CA1, "collision-client-1", CertsConfig),
+ make_certs:enduser(PrivDir, CA2, "collision-client-2", CertsConfig),
+
+ [ServerOpts1, ServerOpts2] =
+ [
+ [{keyfile, filename:join([PrivDir, EndUser, "key.pem"])},
+ {certfile, filename:join([PrivDir, EndUser, "cert.pem"])},
+ {cacertfile, filename:join([PrivDir, EndUser, "cacerts.pem"])}]
+ || EndUser <- ["collision-client-1", "collision-client-2"]],
+
+ %% Add CRLs for our new CAs into the CRL hash directory.
+ %% Find the hashes with 'openssl crl -noout -hash -in crl.pem'.
+ CrlDir = filename:join(PrivDir, "crls"),
+ populate_crl_hash_dir(PrivDir, CrlDir,
+ [{CA1, "b68fc624"},
+ {CA2, "b68fc624"}],
+ replace),
+
+ ClientOpts = ?config(crl_cache_opts, Config) ++
+ [{cacertfile, filename:join([PrivDir, "erlangCA", "cacerts.pem"])},
+ {crl_check, Check},
+ {verify, verify_peer}],
+
+ {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),
+
+ %% Neither certificate revoked; both succeed.
+ crl_verify_valid(Hostname, ServerNode, ServerOpts1, ClientNode, ClientOpts),
+ crl_verify_valid(Hostname, ServerNode, ServerOpts2, ClientNode, ClientOpts),
+
+ make_certs:revoke(PrivDir, CA1, "collision-client-1", CertsConfig),
+ populate_crl_hash_dir(PrivDir, CrlDir,
+ [{CA1, "b68fc624"},
+ {CA2, "b68fc624"}],
+ replace),
+
+ %% First certificate revoked; first fails, second succeeds.
+ crl_verify_error(Hostname, ServerNode, ServerOpts1, ClientNode, ClientOpts,
+ "certificate revoked"),
+ crl_verify_valid(Hostname, ServerNode, ServerOpts2, ClientNode, ClientOpts),
+
+ make_certs:revoke(PrivDir, CA2, "collision-client-2", CertsConfig),
+ populate_crl_hash_dir(PrivDir, CrlDir,
+ [{CA1, "b68fc624"},
+ {CA2, "b68fc624"}],
+ replace),
+
+ %% Second certificate revoked; both fail.
+ crl_verify_error(Hostname, ServerNode, ServerOpts1, ClientNode, ClientOpts,
+ "certificate revoked"),
+ crl_verify_error(Hostname, ServerNode, ServerOpts2, ClientNode, ClientOpts,
+ "certificate revoked"),
+
+ ok.
+
+crl_hash_dir_expired() ->
+ [{doc,"Verify ssl_crl_hash_dir behaviour with expired CRLs"}].
+crl_hash_dir_expired(Config) when is_list(Config) ->
+ PrivDir = ?config(cert_dir, Config),
+ Check = ?config(crl_check, Config),
+
+ CA = "CRL-maybe-expired-CA",
+ %% Add "issuing distribution point", to ensure that verification
+ %% fails if there is no valid CRL.
+ CertsConfig = make_certs:make_config([{issuing_distribution_point, true}]),
+ make_certs:intermediateCA(PrivDir, CA, "erlangCA", CertsConfig),
+ EndUser = "CRL-maybe-expired",
+ make_certs:enduser(PrivDir, CA, EndUser, CertsConfig),
+
+ ServerOpts = [{keyfile, filename:join([PrivDir, EndUser, "key.pem"])},
+ {certfile, filename:join([PrivDir, EndUser, "cert.pem"])},
+ {cacertfile, filename:join([PrivDir, EndUser, "cacerts.pem"])}],
+ ClientOpts = ?config(crl_cache_opts, Config) ++
+ [{cacertfile, filename:join([PrivDir, CA, "cacerts.pem"])},
+ {crl_check, Check},
+ {verify, verify_peer}],
+ {ClientNode, ServerNode, Hostname} = ssl_test_lib:run_where(Config),
+
+ %% First make a CRL that expired yesterday.
+ make_certs:gencrl(PrivDir, CA, CertsConfig, -24),
+ CrlDir = filename:join(PrivDir, "crls"),
+ populate_crl_hash_dir(PrivDir, CrlDir,
+ [{CA, "1627b4b0"}],
+ replace),
+
+ %% Since the CRL has expired, it's treated as missing, and the
+ %% outcome depends on the crl_check setting.
+ case Check of
+ true ->
+ %% The error "revocation status undetermined" gets turned
+ %% into "bad certificate".
+ crl_verify_error(Hostname, ServerNode, ServerOpts, ClientNode, ClientOpts,
+ "bad certificate");
+ peer ->
+ crl_verify_error(Hostname, ServerNode, ServerOpts, ClientNode, ClientOpts,
+ "bad certificate");
+ best_effort ->
+ %% In "best effort" mode, we consider the certificate not
+ %% to be revoked if we can't find the appropriate CRL.
+ crl_verify_valid(Hostname, ServerNode, ServerOpts, ClientNode, ClientOpts)
+ end,
+
+ %% Now make a CRL that expires tomorrow.
+ make_certs:gencrl(PrivDir, CA, CertsConfig, 24),
+ CrlDir = filename:join(PrivDir, "crls"),
+ populate_crl_hash_dir(PrivDir, CrlDir,
+ [{CA, "1627b4b0"}],
+ add),
+
+ %% With a valid CRL, verification should always pass.
+ crl_verify_valid(Hostname, ServerNode, ServerOpts, ClientNode, ClientOpts),
+
+ ok.
+
crl_verify_valid(Hostname, ServerNode, ServerOpts, ClientNode, ClientOpts) ->
Server = ssl_test_lib:start_server([{node, ServerNode}, {port, 0},
{from, self()},
@@ -311,3 +462,31 @@ make_dir_path(PathComponents) ->
rename_crl(Filename) ->
file:rename(Filename, Filename ++ ".notfound").
+
+populate_crl_hash_dir(CertDir, CrlDir, CAsHashes, AddOrReplace) ->
+ ok = filelib:ensure_dir(filename:join(CrlDir, "crls")),
+ case AddOrReplace of
+ replace ->
+ %% Delete existing files, so we can override them.
+ [ok = file:delete(FileToDelete) ||
+ {_CA, Hash} <- CAsHashes,
+ FileToDelete <- filelib:wildcard(
+ filename:join(CrlDir, Hash ++ ".r*"))];
+ add ->
+ ok
+ end,
+ %% Create new files, incrementing suffix if needed to find unique names.
+ [{ok, _} =
+ file:copy(filename:join([CertDir, CA, "crl.pem"]),
+ find_free_name(CrlDir, Hash, 0))
+ || {CA, Hash} <- CAsHashes],
+ ok.
+
+find_free_name(CrlDir, Hash, N) ->
+ Name = filename:join(CrlDir, Hash ++ ".r" ++ integer_to_list(N)),
+ case filelib:is_file(Name) of
+ true ->
+ find_free_name(CrlDir, Hash, N + 1);
+ false ->
+ Name
+ end.
generated by cgit v1.2.3 (git 2.25.1) at 2024-11-02 15:44:27 +0000