Fixed cname handling in TLS certificate verification
Resolves: rhbz#1942582
This commit is contained in:
Jaroslav Škarvada
parent
96d10acf3e
commit
a8bf41bfdb
154
exim-4.94-tls-cname-handling-fix.patch
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154
exim-4.94-tls-cname-handling-fix.patch
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@ -0,0 +1,154 @@
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diff --git a/src/host.c b/src/host.c
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index 0e0e013..99bbba7 100644
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--- a/src/host.c
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+++ b/src/host.c
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@@ -1950,6 +1950,13 @@ BOOL temp_error = FALSE;
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int af;
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#endif
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+#ifndef DISABLE_TLS
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+/* Copy the host name at this point to the value which is used for
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+TLS certificate name checking, before anything modifies it. */
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+
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+host->certname = host->name;
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+#endif
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+
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/* Make sure DNS options are set as required. This appears to be necessary in
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some circumstances when the get..byname() function actually calls the DNS. */
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@@ -2117,6 +2124,9 @@ for (int i = 1; i <= times;
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{
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host_item *next = store_get(sizeof(host_item), FALSE);
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next->name = host->name;
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+#ifndef DISABLE_TLS
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+ next->certname = host->certname;
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+#endif
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next->mx = host->mx;
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next->address = text_address;
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next->port = PORT_NONE;
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@@ -2135,12 +2145,12 @@ for (int i = 1; i <= times;
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NULL. If temp_error is set, at least one of the lookups gave a temporary error,
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so we pass that back. */
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-if (host->address == NULL)
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+if (!host->address)
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{
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uschar *msg =
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#ifndef STAND_ALONE
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- (message_id[0] == 0 && smtp_in != NULL)?
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- string_sprintf("no IP address found for host %s (during %s)", host->name,
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+ message_id[0] == 0 && smtp_in
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+ ? string_sprintf("no IP address found for host %s (during %s)", host->name,
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smtp_get_connection_info()) :
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#endif
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string_sprintf("no IP address found for host %s", host->name);
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@@ -2260,6 +2270,13 @@ BOOL v6_find_again = FALSE;
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BOOL dnssec_fail = FALSE;
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int i;
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+#ifndef DISABLE_TLS
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+/* Copy the host name at this point to the value which is used for
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+TLS certificate name checking, before any CNAME-following modifies it. */
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+
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+host->certname = host->name;
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+#endif
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+
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/* If allow_ip is set, a name which is an IP address returns that value
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as its address. This is used for MX records when allow_mx_to_ip is set, for
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those sites that feel they have to flaunt the RFC rules. */
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diff --git a/src/structs.h b/src/structs.h
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index c6700d5..206237f 100644
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--- a/src/structs.h
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+++ b/src/structs.h
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@@ -80,14 +80,17 @@ typedef enum {DS_UNK=-1, DS_NO, DS_YES} dnssec_status_t;
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typedef struct host_item {
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struct host_item *next;
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- const uschar *name; /* Host name */
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- const uschar *address; /* IP address in text form */
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- int port; /* port value in host order (if SRV lookup) */
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- int mx; /* MX value if found via MX records */
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- int sort_key; /* MX*1000 plus random "fraction" */
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- int status; /* Usable, unusable, or unknown */
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- int why; /* Why host is unusable */
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- int last_try; /* Time of last try if known */
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+ const uschar *name; /* Host name */
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+#ifndef DISABLE_TLS
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+ const uschar *certname; /* Name used for certificate checks */
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+#endif
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+ const uschar *address; /* IP address in text form */
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+ int port; /* port value in host order (if SRV lookup) */
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+ int mx; /* MX value if found via MX records */
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+ int sort_key; /* MX*1000 plus random "fraction" */
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+ int status; /* Usable, unusable, or unknown */
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+ int why; /* Why host is unusable */
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+ int last_try; /* Time of last try if known */
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dnssec_status_t dnssec;
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} host_item;
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diff --git a/src/tls-gnu.c b/src/tls-gnu.c
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index 24114f0..875c82e 100644
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--- a/src/tls-gnu.c
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+++ b/src/tls-gnu.c
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@@ -2601,9 +2601,9 @@ if (verify_check_given_host(CUSS &ob->tls_verify_cert_hostnames, host) == OK)
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{
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state->exp_tls_verify_cert_hostnames =
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#ifdef SUPPORT_I18N
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- string_domain_utf8_to_alabel(host->name, NULL);
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+ string_domain_utf8_to_alabel(host->certname, NULL);
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#else
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- host->name;
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+ host->certname;
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#endif
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DEBUG(D_tls)
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debug_printf("TLS: server cert verification includes hostname: \"%s\".\n",
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diff --git a/src/tls-openssl.c b/src/tls-openssl.c
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index 8c9d8aa..a623229 100644
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--- a/src/tls-openssl.c
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+++ b/src/tls-openssl.c
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@@ -372,10 +372,10 @@ typedef struct ocsp_resp {
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} ocsp_resplist;
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typedef struct tls_ext_ctx_cb {
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- tls_support * tlsp;
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- uschar *certificate;
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- uschar *privatekey;
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- BOOL is_server;
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+ tls_support * tlsp;
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+ uschar * certificate;
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+ uschar * privatekey;
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+ BOOL is_server;
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#ifndef DISABLE_OCSP
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STACK_OF(X509) *verify_stack; /* chain for verifying the proof */
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union {
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@@ -390,14 +390,14 @@ typedef struct tls_ext_ctx_cb {
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} client;
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} u_ocsp;
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#endif
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- uschar *dhparam;
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+ uschar * dhparam;
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/* these are cached from first expand */
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- uschar *server_cipher_list;
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+ uschar * server_cipher_list;
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/* only passed down to tls_error: */
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- host_item *host;
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+ host_item * host;
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const uschar * verify_cert_hostnames;
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#ifndef DISABLE_EVENT
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- uschar * event_action;
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+ uschar * event_action;
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#endif
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} tls_ext_ctx_cb;
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@@ -2915,9 +2915,9 @@ if (verify_check_given_host(CUSS &ob->tls_verify_cert_hostnames, host) == OK)
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{
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cbinfo->verify_cert_hostnames =
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#ifdef SUPPORT_I18N
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- string_domain_utf8_to_alabel(host->name, NULL);
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+ string_domain_utf8_to_alabel(host->certname, NULL);
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#else
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- host->name;
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+ host->certname;
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#endif
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DEBUG(D_tls) debug_printf("Cert hostname to check: \"%s\"\n",
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cbinfo->verify_cert_hostnames);
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@ -12,7 +12,7 @@
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Summary: The exim mail transfer agent
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Name: exim
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Version: 4.94
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Release: 6%{?dist}
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Release: 7%{?dist}
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License: GPLv2+
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Url: https://www.exim.org/
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@ -46,6 +46,8 @@ Patch0: exim-4.94-config.patch
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Patch1: exim-4.94-libdir.patch
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Patch2: exim-4.94-dlopen-localscan.patch
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Patch3: exim-4.85-pic.patch
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# https://bugs.exim.org/show_bug.cgi?id=2594
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Patch4: exim-4.94-tls-cname-handling-fix.patch
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Requires: /etc/pki/tls/certs /etc/pki/tls/private
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Requires: /etc/aliases
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@ -160,6 +162,7 @@ greylisting unconditional.
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%patch1 -p1 -b .libdir
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%patch2 -p1 -b .dl
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%patch3 -p1 -b .fpic
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%patch4 -p1 -b .tls-cname-handling-fix
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cp src/EDITME Local/Makefile
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sed -i 's@^# LOOKUP_MODULE_DIR=.*@LOOKUP_MODULE_DIR=%{_libdir}/exim/%{version}-%{release}/lookups@' Local/Makefile
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@ -477,6 +480,10 @@ fi
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%{_sysconfdir}/cron.daily/greylist-tidy.sh
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%changelog
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* Thu Mar 25 2021 Jaroslav Škarvada <jskarvad@redhat.com> - 4.94-7
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- Fixed cname handling in TLS certificate verification
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Resolves: rhbz#1942582
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* Tue Mar 02 2021 Zbigniew Jędrzejewski-Szmek <zbyszek@in.waw.pl> - 4.94-6
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- Rebuilt for updated systemd-rpm-macros
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See https://pagure.io/fesco/issue/2583.
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