* modules/ssl/ssl_engine_vars.c (ssl_var_lookup_ssl_cert_remain): New

function.  (ssl_var_lookup_ssl_cert): Support _V_REMAIN suffix for
SSL_{SERVER,CLIENT} as number of days until certificate expires.

* modules/ssl_engine_kernel.c: Export SSL_CLIENT_V_REMAIN if
+StdEnvVars is configured.


git-svn-id: https://svn.apache.org/repos/asf/httpd/httpd/trunk@104700 13f79535-47bb-0310-9956-ffa450edef68

CHANGES

@@ -2,6 +2,9 @@ Changes with Apache 2.1.0-dev
 
   [Remove entries to the current 2.0 section below, when backported]
 
+  *) mod_ssl: Add SSL_CLIENT_V_REMAIN variable, representing the
+     number of days until the client cert expires.  [Joe Orton]
+
   *) mod_userdir: Ensure that the userdir identity is used for
      suexec userdir access in a virtual host which has suexec configured.  
      PR 18156.  [Joshua Slive]

modules/ssl/ssl_engine_kernel.c

@@ -934,6 +934,7 @@ static const char *ssl_hook_Fixup_vars[] = {
     "SSL_CLIENT_M_SERIAL",
     "SSL_CLIENT_V_START",
     "SSL_CLIENT_V_END",
+    "SSL_CLIENT_V_REMAIN",
     "SSL_CLIENT_S_DN",
     "SSL_CLIENT_S_DN_C",
     "SSL_CLIENT_S_DN_ST",

modules/ssl/ssl_engine_vars.c

@@ -29,6 +29,8 @@
 #include "ssl_private.h"
 #include "mod_ssl.h"
 
+#include "apr_time.h"
+
 /*  _________________________________________________________________
 **
 **  Variable Lookup
@@ -39,6 +41,7 @@ static char *ssl_var_lookup_ssl(apr_pool_t *p, conn_rec *c, char *var);
 static char *ssl_var_lookup_ssl_cert(apr_pool_t *p, X509 *xs, char *var);
 static char *ssl_var_lookup_ssl_cert_dn(apr_pool_t *p, X509_NAME *xsname, char *var);
 static char *ssl_var_lookup_ssl_cert_valid(apr_pool_t *p, ASN1_UTCTIME *tm);
+static char *ssl_var_lookup_ssl_cert_remain(apr_pool_t *p, ASN1_UTCTIME *tm);
 static char *ssl_var_lookup_ssl_cert_serial(apr_pool_t *p, X509 *xs);
 static char *ssl_var_lookup_ssl_cert_chain(apr_pool_t *p, STACK_OF(X509) *sk, char *var);
 static char *ssl_var_lookup_ssl_cert_PEM(apr_pool_t *p, X509 *xs);
@@ -318,6 +321,10 @@ static char *ssl_var_lookup_ssl_cert(apr_pool_t *p, X509 *xs, char *var)
     else if (strcEQ(var, "V_END")) {
         result = ssl_var_lookup_ssl_cert_valid(p, X509_get_notAfter(xs));
     }
+    else if (strcEQ(var, "V_REMAIN")) {
+        result = ssl_var_lookup_ssl_cert_remain(p, X509_get_notAfter(xs));
+        resdup = FALSE;
+    }
     else if (strcEQ(var, "S_DN")) {
         xsname = X509_get_subject_name(xs);
         cp = X509_NAME_oneline(xsname, NULL, 0);
@@ -449,6 +456,41 @@ static char *ssl_var_lookup_ssl_cert_valid(apr_pool_t *p, ASN1_UTCTIME *tm)
     return result;
 }
 
+#define DIGIT2NUM(x) (((x)[0] - '0') * 10 + (x)[1] - '0')
+
+/* Return a string giving the number of days remaining until 'tm', or
+ * "0" if this can't be determined. */
+static char *ssl_var_lookup_ssl_cert_remain(apr_pool_t *p, ASN1_UTCTIME *tm)
+{
+    apr_time_t then, now = apr_time_now();
+    apr_time_exp_t exp = {0};
+    long diff;
+
+    /* Fail if the time isn't a valid ASN.1 UTCTIME; RFC3280 mandates
+     * that the seconds digits are present even though ASN.1
+     * doesn't. */    
+    if (tm->length < 11 || !ASN1_UTCTIME_check(tm)) {
+        return apr_pstrdup(p, "0");
+    }
+
+    exp.tm_year = DIGIT2NUM(tm->data);
+    exp.tm_mon = DIGIT2NUM(tm->data + 2) - 1;
+    exp.tm_mday = DIGIT2NUM(tm->data + 4) + 1;
+    exp.tm_hour = DIGIT2NUM(tm->data + 6);
+    exp.tm_min = DIGIT2NUM(tm->data + 8);
+    exp.tm_sec = DIGIT2NUM(tm->data + 10);
+
+    if (exp.tm_year <= 50) exp.tm_year += 100;
+
+    if (apr_time_exp_gmt_get(&then, &exp) != APR_SUCCESS) {
+        return apr_pstrdup(p, "0");
+    }
+    
+    diff = (apr_time_sec(then) - apr_time_sec(now)) / (60*60*24);
+
+    return diff > 0 ? apr_ltoa(p, diff) : apr_pstrdup(p, "0");
+}
+
 static char *ssl_var_lookup_ssl_cert_serial(apr_pool_t *p, X509 *xs)
 {
     char *result;