From a5f239e4959d4df6a4a341d8855e14d17399d671 Mon Sep 17 00:00:00 2001 From: Phil Pennock Date: Sun, 24 Jun 2012 02:55:29 -0700 Subject: [PATCH] Add gnutls_enable_pkcs11 option. GnuTLS 2.12.0 adds PKCS11 support using p11-kit and by default will autoload modules, which interoperates badly with GNOME keyring integration, configured via paths in environment variables, and Exim invoked by the user (eg, mailq) will then try to load the modules, fail and spew warnings from the module for a library loaded by a library. http://www.gnu.org/software/gnutls/manual/gnutls.html#Smart-cards-and-HSMs documents that to prevent this, explicitly init PKCS11 before calling gnutls_global_init(). So we do so, unless the admin sets the new option. Reported by Andreas Metzler, who confirmed that the added calls fixed the problem for him. --- doc/doc-docbook/spec.xfpt | 16 ++++++++++++++++ doc/doc-txt/ChangeLog | 3 +++ doc/doc-txt/NewStuff | 10 ++++++++++ doc/doc-txt/OptionLists.txt | 1 + src/README.UPDATING | 7 +++++++ src/src/globals.c | 1 + src/src/globals.h | 1 + src/src/readconf.c | 1 + src/src/tls-gnu.c | 27 ++++++++++++++++++++++++++- 9 files changed, 66 insertions(+), 1 deletion(-) diff --git a/doc/doc-docbook/spec.xfpt b/doc/doc-docbook/spec.xfpt index dcf6b6cfb..f23c42afb 100644 --- a/doc/doc-docbook/spec.xfpt +++ b/doc/doc-docbook/spec.xfpt @@ -12825,6 +12825,9 @@ listed in more than one group. .section "TLS" "SECID108" .table2 .row &%gnutls_compat_mode%& "use GnuTLS compatibility mode" +.new +.row &%gnutls_enable_pkcs11%& "allow GnuTLS to autoload PKCS11 modules" +.wen .row &%openssl_options%& "adjust OpenSSL compatibility options" .row &%tls_advertise_hosts%& "advertise TLS to these hosts" .row &%tls_certificate%& "location of server certificate" @@ -13853,6 +13856,19 @@ This option controls whether GnuTLS is used in compatibility mode in an Exim server. This reduces security slightly, but improves interworking with older implementations of TLS. + +.new +option gnutls_enable_pkcs11 main boolean unset +This option will let GnuTLS (2.12.0 or later) autoload PKCS11 modules with +the p11-kit configuration files in &_/etc/pkcs11/modules/_&. + +See +&url(http://www.gnu.org/software/gnutls/manual/gnutls.html#Smart-cards-and-HSMs) +for documentation. +.wen + + + .option headers_charset main string "see below" This option sets a default character set for translating from encoded MIME &"words"& in header lines, when referenced by an &$h_xxx$& expansion item. The diff --git a/doc/doc-txt/ChangeLog b/doc/doc-txt/ChangeLog index 34521098e..8fa9621bd 100644 --- a/doc/doc-txt/ChangeLog +++ b/doc/doc-txt/ChangeLog @@ -44,6 +44,9 @@ NM/01 Bugzilla 1197 - Spec typo JH/03 Add expansion operators ${listnamed:name} and ${listcount:string} +PP/09 Add gnutls_enable_pkcs11 option. + + Exim version 4.80 ----------------- diff --git a/doc/doc-txt/NewStuff b/doc/doc-txt/NewStuff index 6d64faa00..c56256bdd 100644 --- a/doc/doc-txt/NewStuff +++ b/doc/doc-txt/NewStuff @@ -87,6 +87,16 @@ Version 4.81 8. New expansion operators ${listnamed:name} to get the content of a named list and ${listcount:string} to count the items in a list. + 9. New global option "gnutls_enable_pkcs11", defaults false. The GnuTLS + rewrite in 4.80 combines with GnuTLS 2.12.0 or later, to autoload PKCS11 + modules. For some situations this is desirable, but we expect admin in + those situations to know they want the feature. More commonly, it means + that GUI user modules get loaded and are broken by the setuid Exim being + unable to access files specified in environment variables and passed + through, thus breakage. So we explicitly inhibit the PKCS11 initialisation + unless this new option is set. + + Version 4.80 ------------ diff --git a/doc/doc-txt/OptionLists.txt b/doc/doc-txt/OptionLists.txt index 1c7881e76..05074bba7 100644 --- a/doc/doc-txt/OptionLists.txt +++ b/doc/doc-txt/OptionLists.txt @@ -243,6 +243,7 @@ gecos_name string* unset main gecos_pattern string unset main gethostbyname boolean false smtp gnutls_compat_mode boolean unset main 4.70 +gnutls_enable_pkcs11 boolean false main 4.81 gnutls_require_kx string* unset main 4.67 deprecated, warns string* unset smtp 4.67 deprecated, warns gnutls_require_mac string* unset main 4.67 deprecated, warns diff --git a/src/README.UPDATING b/src/README.UPDATING index d34dec1e1..b7406f43c 100644 --- a/src/README.UPDATING +++ b/src/README.UPDATING @@ -26,6 +26,13 @@ The rest of this document contains information about changes in 4.xx releases that might affect a running system. +Exim version 4.81 +----------------- + + * New option gnutls_enable_pkcs11 defaults false; if you have GnuTLS 2.12.0 + or later and do want PKCS11 modules to be autoloaded, then set this option. + + Exim version 4.80 ----------------- diff --git a/src/src/globals.c b/src/src/globals.c index 97c7166ab..1faf75cda 100644 --- a/src/src/globals.c +++ b/src/src/globals.c @@ -117,6 +117,7 @@ tls_support tls_out = { #ifdef SUPPORT_TLS BOOL gnutls_compat_mode = FALSE; +BOOL gnutls_enable_pkcs11 = FALSE; uschar *gnutls_require_mac = NULL; uschar *gnutls_require_kx = NULL; uschar *gnutls_require_proto = NULL; diff --git a/src/src/globals.h b/src/src/globals.h index e910dbe1b..27c87b141 100644 --- a/src/src/globals.h +++ b/src/src/globals.h @@ -89,6 +89,7 @@ extern tls_support tls_out; #ifdef SUPPORT_TLS extern BOOL gnutls_compat_mode; /* Less security, more compatibility */ +extern BOOL gnutls_enable_pkcs11; /* Let GnuTLS autoload PKCS11 modules */ extern uschar *gnutls_require_mac; /* So some can be avoided */ extern uschar *gnutls_require_kx; /* So some can be avoided */ extern uschar *gnutls_require_proto; /* So some can be avoided */ diff --git a/src/src/readconf.c b/src/src/readconf.c index 750e0d316..087ab5b9b 100644 --- a/src/src/readconf.c +++ b/src/src/readconf.c @@ -236,6 +236,7 @@ static optionlist optionlist_config[] = { { "gecos_pattern", opt_stringptr, &gecos_pattern }, #ifdef SUPPORT_TLS { "gnutls_compat_mode", opt_bool, &gnutls_compat_mode }, + { "gnutls_enable_pkcs11", opt_bool, &gnutls_enable_pkcs11 }, /* These three gnutls_require_* options stopped working in Exim 4.80 */ { "gnutls_require_kx", opt_stringptr, &gnutls_require_kx }, { "gnutls_require_mac", opt_stringptr, &gnutls_require_mac }, diff --git a/src/src/tls-gnu.c b/src/src/tls-gnu.c index c582af79f..239985767 100644 --- a/src/src/tls-gnu.c +++ b/src/src/tls-gnu.c @@ -39,6 +39,10 @@ require current GnuTLS, then we'll drop support for the ancient libraries). #include /* man-page is incorrect, gnutls_rnd() is not in gnutls.h: */ #include +/* needed to disable PKCS11 autoload unless requested */ +#if GNUTLS_VERSION_NUMBER >= 0x020c00 +# include +#endif /* GnuTLS 2 vs 3 @@ -172,6 +176,7 @@ before, for now. */ #define HAVE_GNUTLS_SESSION_CHANNEL_BINDING #define HAVE_GNUTLS_SEC_PARAM_CONSTANTS #define HAVE_GNUTLS_RND +#define HAVE_GNUTLS_PKCS11 #endif @@ -911,6 +916,19 @@ if (!exim_gnutls_base_init_done) { DEBUG(D_tls) debug_printf("GnuTLS global init required.\n"); +#ifdef HAVE_GNUTLS_PKCS11 + /* By default, gnutls_global_init will init PKCS11 support in auto mode, + which loads modules from a config file, which sounds good and may be wanted + by some sysadmin, but also means in common configurations that GNOME keyring + environment variables are used and so breaks for users calling mailq. + To prevent this, we init PKCS11 first, which is the documented approach. */ + if (!gnutls_enable_pkcs11) + { + rc = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL); + exim_gnutls_err_check(US"gnutls_pkcs11_init"); + } +#endif + rc = gnutls_global_init(); exim_gnutls_err_check(US"gnutls_global_init"); @@ -970,7 +988,7 @@ if (rc != OK) return rc; /* set SNI in client, only */ if (host) { - if (!expand_check(state->tlsp->sni, "tls_out_sni", &state->exp_tls_sni)) + if (!expand_check(state->tlsp->sni, US"tls_out_sni", &state->exp_tls_sni)) return DEFER; if (state->exp_tls_sni && *state->exp_tls_sni) { @@ -1945,6 +1963,13 @@ if (exim_gnutls_base_init_done) log_write(0, LOG_MAIN|LOG_PANIC, "already initialised GnuTLS, Exim developer bug"); +#ifdef HAVE_GNUTLS_PKCS11 +if (!gnutls_enable_pkcs11) + { + rc = gnutls_pkcs11_init(GNUTLS_PKCS11_FLAG_MANUAL, NULL); + validate_check_rc(US"gnutls_pkcs11_init"); + } +#endif rc = gnutls_global_init(); validate_check_rc(US"gnutls_global_init()"); exim_gnutls_base_init_done = TRUE; -- 2.30.2