public_key: Workaround for incorrectly encoded utf8 emailAddress

Author: Daniel Barney <[email protected]>
Date:   Thu Oct 25 14:33:11 2012 -0600

    Most common browsers are lax in thier handling of how the
    emailAddress field is encoded. RFC 3280 section 4.1.2.6
    defines the encoding as IA5String, however browsers will
    also handle certificates with the emailAddress field
    encoded as UTF8String. This fix allows the emailAddress
    to be decoded as both an IA5String and an UTF8String.

Reviewed by: Andrew Bennett <[email protected]>

3 files changed, 54 insertions, 7 deletions

diff --git a/lib/public_key/asn1/OTP-PKIX.asn1 b/lib/public_key/asn1/OTP-PKIX.asn1
index 911a156d6c..8d3c76adf5 100644
--- a/lib/public_key/asn1/OTP-PKIX.asn1
+++ b/lib/public_key/asn1/OTP-PKIX.asn1
@@ -252,7 +252,17 @@ domainComponent ATTRIBUTE-TYPE-AND-VALUE-CLASS ::= {
 
 emailAddress ATTRIBUTE-TYPE-AND-VALUE-CLASS ::= {
 	ID id-emailAddress
-	TYPE EmailAddress }
+	TYPE EmailAddress } -- this is currently not used when decoding
+ -- The decoding and mapping between ID and Type is done in the code
+ -- in module publickey_cert_records via the function attribute_type
+ -- To be more forgiving and compatible with other SSL implementations
+ -- regarding how to handle and sometimes accept incorrect certificates
+ -- we define and use the type below instead of emailAddress
+
+ OTP-emailAddress ::= CHOICE {
+       ia5String         IA5String       (SIZE (1..255)),
+       utf8String        UTF8String      (SIZE (1..255))
+}
 
 --
 -- Signature and Public Key Algorithms
diff --git a/lib/public_key/src/pubkey_cert_records.erl b/lib/public_key/src/pubkey_cert_records.erl
index 0449129809..fdd89aa70d 100644
--- a/lib/public_key/src/pubkey_cert_records.erl
+++ b/lib/public_key/src/pubkey_cert_records.erl
@@ -1,7 +1,7 @@
 %%
 %% %CopyrightBegin%
 %%
-%% Copyright Ericsson AB 2008-2012. All Rights Reserved.
+%% Copyright Ericsson AB 2008-2013. All Rights Reserved.
 %%
 %% The contents of this file are subject to the Erlang Public License,
 %% Version 1.1, (the "License"); you may not use this file except in
@@ -67,6 +67,15 @@ transform(#'AttributeTypeAndValue'{type=Id,value=Value0} = ATAV, Func) ->
 		    {ok, {printableString, ASCCI}} ->
 			{ok, ASCCI}
 		end;
+	    'EmailAddress' when Func == decode ->
+		%% Workaround that some certificates break the ASN-1 spec
+		%% and encode emailAddress as utf8
+		case 'OTP-PUB-KEY':Func('OTP-emailAddress', Value0) of
+		    {ok, {utf8String, Utf8Value}} ->
+			{ok, unicode:characters_to_list(Utf8Value)};
+		    {ok, {ia5String, Ia5Value}} ->
+			{ok, Ia5Value}
+		end;
             Type when is_atom(Type) -> 'OTP-PUB-KEY':Func(Type, Value0);
             _UnknownType            -> {ok, Value0}
         end,
diff --git a/lib/public_key/test/public_key_SUITE.erl b/lib/public_key/test/public_key_SUITE.erl
index f8d167e770..9c8f14249a 100644
--- a/lib/public_key/test/public_key_SUITE.erl
+++ b/lib/public_key/test/public_key_SUITE.erl
@@ -41,7 +41,7 @@ all() ->
      {group, ssh_public_key_decode_encode},
      encrypt_decrypt,
      {group, sign_verify},
-     pkix, pkix_countryname, pkix_path_validation,
+     pkix, pkix_countryname, pkix_emailaddress, pkix_path_validation,
      pkix_iso_rsa_oid, pkix_iso_dsa_oid].
 
 groups() -> 
@@ -586,9 +586,9 @@ pkix(Config) when is_list(Config) ->
 
 %%--------------------------------------------------------------------
 pkix_countryname() ->
- [{doc, "Test workaround for certs that code x509countryname as utf8"}].
+    [{doc, "Test workaround for certs that code x509countryname as utf8"}].
 pkix_countryname(Config) when is_list(Config) ->
-    Cert = incorrect_pkix_cert(),
+    Cert = incorrect_countryname_pkix_cert(),
     OTPCert = public_key:pkix_decode_cert(Cert, otp),
     TBSCert = OTPCert#'OTPCertificate'.tbsCertificate,
     Issuer = TBSCert#'OTPTBSCertificate'.issuer,
@@ -597,6 +597,18 @@ pkix_countryname(Config) when is_list(Config) ->
     check_countryname(Subj).
 
 %%--------------------------------------------------------------------
+pkix_emailaddress() ->
+    [{doc, "Test workaround for certs that code emailAddress as utf8"}].
+pkix_emailaddress(Config) when is_list(Config) ->
+    Cert = incorrect_emailaddress_pkix_cert(),
+    OTPCert = public_key:pkix_decode_cert(Cert, otp),
+    TBSCert = OTPCert#'OTPCertificate'.tbsCertificate,
+    Issuer = TBSCert#'OTPTBSCertificate'.issuer,
+    Subj   = TBSCert#'OTPTBSCertificate'.subject,
+    check_emailaddress(Issuer),
+    check_emailaddress(Subj).
+
+%%--------------------------------------------------------------------
 pkix_path_validation() ->
     [{doc, "Test PKIX path validation"}].
 pkix_path_validation(Config) when is_list(Config) ->
@@ -710,10 +722,23 @@ do_check_countryname([#'AttributeTypeAndValue'{type = ?'id-at-countryName',
     ok;
 do_check_countryname([#'AttributeTypeAndValue'{type = ?'id-at-countryName',
 					       value =  Value}|_]) ->
-    ct:fail({incorrect_cuntry_name, Value});
+    ct:fail({incorrect_country_name, Value});
 do_check_countryname([_| Rest]) ->
     do_check_countryname(Rest).
 
+check_emailaddress({rdnSequence,DirName}) ->
+    do_check_emailaddress(DirName).
+do_check_emailaddress([]) ->
+    ok;
+do_check_emailaddress([#'AttributeTypeAndValue'{type = ?'id-emailAddress',
+					       value = "[email protected]"}|_]) ->
+    ok;
+do_check_emailaddress([#'AttributeTypeAndValue'{type = ?'id-at-countryName',
+					       value =  Value}|_]) ->
+    ct:fail({incorrect_email_address, Value});
+do_check_emailaddress([_| Rest]) ->
+    do_check_emailaddress(Rest).
+
 check_entry_type(#'DSAPrivateKey'{}, 'DSAPrivateKey') ->
     true;
 check_entry_type(#'RSAPrivateKey'{}, 'RSAPrivateKey') ->
@@ -732,5 +757,8 @@ check_entry_type(_,_) ->
 strip_ending_newlines(Bin) ->
     string:strip(binary_to_list(Bin), right, 10).
 
-incorrect_pkix_cert() ->
+incorrect_countryname_pkix_cert() ->
     <<48,130,5,186,48,130,4,162,160,3,2,1,2,2,7,7,250,61,63,6,140,137,48,13,6,9,42, 134,72,134,247,13,1,1,5,5,0,48,129,220,49,11,48,9,6,3,85,4,6,19,2,85,83,49, 16,48,14,6,3,85,4,8,19,7,65,114,105,122,111,110,97,49,19,48,17,6,3,85,4,7,19, 10,83,99,111,116,116,115,100,97,108,101,49,37,48,35,6,3,85,4,10,19,28,83,116, 97,114,102,105,101,108,100,32,84,101,99,104,110,111,108,111,103,105,101,115, 44,32,73,110,99,46,49,57,48,55,6,3,85,4,11,19,48,104,116,116,112,58,47,47,99, 101,114,116,105,102,105,99,97,116,101,115,46,115,116,97,114,102,105,101,108, 100,116,101,99,104,46,99,111,109,47,114,101,112,111,115,105,116,111,114,121, 49,49,48,47,6,3,85,4,3,19,40,83,116,97,114,102,105,101,108,100,32,83,101,99, 117,114,101,32,67,101,114,116,105,102,105,99,97,116,105,111,110,32,65,117, 116,104,111,114,105,116,121,49,17,48,15,6,3,85,4,5,19,8,49,48,54,56,56,52,51, 53,48,30,23,13,49,48,49,48,50,51,48,49,51,50,48,53,90,23,13,49,50,49,48,50, 51,48,49,51,50,48,53,90,48,122,49,11,48,9,6,3,85,4,6,12,2,85,83,49,11,48,9,6, 3,85,4,8,12,2,65,90,49,19,48,17,6,3,85,4,7,12,10,83,99,111,116,116,115,100, 97,108,101,49,38,48,36,6,3,85,4,10,12,29,83,112,101,99,105,97,108,32,68,111, 109,97,105,110,32,83,101,114,118,105,99,101,115,44,32,73,110,99,46,49,33,48, 31,6,3,85,4,3,12,24,42,46,108,111,103,105,110,46,115,101,99,117,114,101,115, 101,114,118,101,114,46,110,101,116,48,130,1,34,48,13,6,9,42,134,72,134,247, 13,1,1,1,5,0,3,130,1,15,0,48,130,1,10,2,130,1,1,0,185,136,240,80,141,36,124, 245,182,130,73,19,188,74,166,117,72,228,185,209,43,129,244,40,44,193,231,11, 209,12,234,88,43,142,1,162,48,122,17,95,230,105,171,131,12,147,46,204,36,80, 250,171,33,253,35,62,83,22,71,212,186,141,14,198,89,89,121,204,224,122,246, 127,110,188,229,162,67,95,6,74,231,127,99,131,7,240,85,102,203,251,50,58,58, 104,245,103,181,183,134,32,203,121,232,54,32,188,139,136,112,166,126,14,91, 223,153,172,164,14,61,38,163,208,215,186,210,136,213,143,70,147,173,109,217, 250,169,108,31,211,104,238,103,93,182,59,165,43,196,189,218,241,30,148,240, 109,90,69,176,194,52,116,173,151,135,239,10,209,179,129,192,102,75,11,25,168, 223,32,174,84,223,134,70,167,55,172,143,27,130,123,226,226,7,34,142,166,39, 48,246,96,231,150,84,220,106,133,193,55,95,159,227,24,249,64,36,1,142,171,16, 202,55,126,7,156,15,194,22,116,53,113,174,104,239,203,120,45,131,57,87,84, 163,184,27,83,57,199,91,200,34,43,98,61,180,144,76,65,170,177,2,3,1,0,1,163, 130,1,224,48,130,1,220,48,15,6,3,85,29,19,1,1,255,4,5,48,3,1,1,0,48,29,6,3, 85,29,37,4,22,48,20,6,8,43,6,1,5,5,7,3,1,6,8,43,6,1,5,5,7,3,2,48,14,6,3,85, 29,15,1,1,255,4,4,3,2,5,160,48,56,6,3,85,29,31,4,49,48,47,48,45,160,43,160, 41,134,39,104,116,116,112,58,47,47,99,114,108,46,115,116,97,114,102,105,101, 108,100,116,101,99,104,46,99,111,109,47,115,102,115,50,45,48,46,99,114,108, 48,83,6,3,85,29,32,4,76,48,74,48,72,6,11,96,134,72,1,134,253,110,1,7,23,2,48, 57,48,55,6,8,43,6,1,5,5,7,2,1,22,43,104,116,116,112,115,58,47,47,99,101,114, 116,115,46,115,116,97,114,102,105,101,108,100,116,101,99,104,46,99,111,109, 47,114,101,112,111,115,105,116,111,114,121,47,48,129,141,6,8,43,6,1,5,5,7,1, 1,4,129,128,48,126,48,42,6,8,43,6,1,5,5,7,48,1,134,30,104,116,116,112,58,47, 47,111,99,115,112,46,115,116,97,114,102,105,101,108,100,116,101,99,104,46,99, 111,109,47,48,80,6,8,43,6,1,5,5,7,48,2,134,68,104,116,116,112,58,47,47,99, 101,114,116,105,102,105,99,97,116,101,115,46,115,116,97,114,102,105,101,108, 100,116,101,99,104,46,99,111,109,47,114,101,112,111,115,105,116,111,114,121, 47,115,102,95,105,110,116,101,114,109,101,100,105,97,116,101,46,99,114,116, 48,31,6,3,85,29,35,4,24,48,22,128,20,73,75,82,39,209,27,188,242,161,33,106, 98,123,81,66,122,138,215,213,86,48,59,6,3,85,29,17,4,52,48,50,130,24,42,46, 108,111,103,105,110,46,115,101,99,117,114,101,115,101,114,118,101,114,46,110, 101,116,130,22,108,111,103,105,110,46,115,101,99,117,114,101,115,101,114,118, 101,114,46,110,101,116,48,29,6,3,85,29,14,4,22,4,20,138,233,191,208,157,203, 249,85,242,239,20,195,48,10,148,49,144,101,255,116,48,13,6,9,42,134,72,134, 247,13,1,1,5,5,0,3,130,1,1,0,82,31,121,162,49,50,143,26,167,202,143,61,71, 189,201,199,57,81,122,116,90,192,88,24,102,194,174,48,157,74,27,87,210,223, 253,93,3,91,150,109,120,1,110,27,11,200,198,141,222,246,14,200,71,105,41,138, 13,114,122,106,63,17,197,181,234,121,61,89,74,65,41,231,248,219,129,83,176, 219,55,107,55,211,112,98,38,49,69,77,96,221,108,123,152,12,210,159,157,141, 43,226,55,187,129,3,82,49,136,66,81,196,91,234,196,10,82,48,6,80,163,83,71, 127,102,177,93,209,129,26,104,2,84,24,255,248,161,3,244,169,234,92,122,110, 43,4,17,113,185,235,108,219,210,236,132,216,177,227,17,169,58,162,159,182, 162,93,160,229,200,9,163,229,110,121,240,168,232,14,91,214,188,196,109,210, 164,222,0,109,139,132,113,91,16,118,173,178,176,80,132,34,41,199,51,206,250, 224,132,60,115,192,94,107,163,219,212,226,225,65,169,148,108,213,46,174,173, 103,110,189,229,166,149,254,31,51,44,144,108,187,182,11,251,201,206,86,138, 208,59,51,86,132,235,81,225,88,34,190,8,184>>.
+
+incorrect_emailaddress_pkix_cert() ->
+    <<48,130,3,74,48,130,2,50,2,9,0,133,49,203,25,198,156,252,230,48,13,6,9,42,134, 72,134,247,13,1,1,5,5,0,48,103,49,11,48,9,6,3,85,4,6,19,2,65,85,49,19,48,17, 6,3,85,4,8,12,10,83,111,109,101,45,83,116,97,116,101,49,33,48,31,6,3,85,4,10, 12,24,73,110,116,101,114,110,101,116,32,87,105,100,103,105,116,115,32,80,116, 121,32,76,116,100,49,32,48,30,6,9,42,134,72,134,247,13,1,9,1,12,17,105,110, 118,97,108,105,100,64,101,109,97,105,108,46,99,111,109,48,30,23,13,49,51,49, 49,48,55,50,48,53,54,49,56,90,23,13,49,52,49,49,48,55,50,48,53,54,49,56,90, 48,103,49,11,48,9,6,3,85,4,6,19,2,65,85,49,19,48,17,6,3,85,4,8,12,10,83,111, 109,101,45,83,116,97,116,101,49,33,48,31,6,3,85,4,10,12,24,73,110,116,101, 114,110,101,116,32,87,105,100,103,105,116,115,32,80,116,121,32,76,116,100,49, 32,48,30,6,9,42,134,72,134,247,13,1,9,1,12,17,105,110,118,97,108,105,100,64, 101,109,97,105,108,46,99,111,109,48,130,1,34,48,13,6,9,42,134,72,134,247,13, 1,1,1,5,0,3,130,1,15,0,48,130,1,10,2,130,1,1,0,190,243,49,213,219,60,232,105, 1,127,126,9,130,15,60,190,78,100,148,235,246,223,21,91,238,200,251,84,55,212, 78,32,120,61,85,172,0,144,248,5,165,29,143,79,64,178,51,153,203,76,115,238, 192,49,173,37,121,203,89,62,157,13,181,166,30,112,154,40,202,140,104,211,157, 73,244,9,78,236,70,153,195,158,233,141,42,238,2,143,160,225,249,27,30,140, 151,176,43,211,87,114,164,108,69,47,39,195,123,185,179,219,28,218,122,53,83, 77,48,81,184,14,91,243,12,62,146,86,210,248,228,171,146,225,87,51,146,155, 116,112,238,212,36,111,58,41,67,27,6,61,61,3,84,150,126,214,121,57,38,12,87, 121,67,244,37,45,145,234,131,115,134,58,194,5,36,166,52,59,229,32,47,152,80, 237,190,58,182,248,98,7,165,198,211,5,31,231,152,116,31,108,71,218,64,188, 178,143,27,167,79,15,112,196,103,116,212,65,197,94,37,4,132,103,91,217,73, 223,207,185,7,153,221,240,232,31,44,102,108,82,83,56,242,210,214,74,71,246, 177,217,148,227,220,230,4,176,226,74,194,37,2,3,1,0,1,48,13,6,9,42,134,72, 134,247,13,1,1,5,5,0,3,130,1,1,0,89,247,141,154,173,123,123,203,143,85,28,79, 73,37,164,6,17,89,171,224,149,22,134,17,198,146,158,192,241,41,253,58,230, 133,71,189,43,66,123,88,15,242,119,227,249,99,137,61,200,54,161,0,177,167, 169,114,80,148,90,22,97,78,162,181,75,93,209,116,245,46,81,232,64,157,93,136, 52,57,229,113,197,218,113,93,42,161,213,104,205,137,30,144,183,58,10,98,47, 227,177,96,40,233,98,150,209,217,68,22,221,133,27,161,152,237,46,36,179,59, 172,97,134,194,205,101,137,71,192,57,153,20,114,27,173,233,166,45,56,0,61, 205,45,202,139,7,132,103,248,193,157,184,123,43,62,172,236,110,49,62,209,78, 249,83,219,133,1,213,143,73,174,16,113,143,189,41,84,60,128,222,30,177,104, 134,220,52,239,171,76,59,176,36,113,176,214,118,16,44,235,21,167,199,216,200, 76,219,142,248,13,70,145,205,216,230,226,148,97,223,216,179,68,209,222,63, 140,137,24,164,192,149,194,79,119,247,75,159,49,116,70,241,70,116,11,40,119, 176,157,36,160,102,140,255,34,248,25,231,136,59>>.