From aa4cc23071213f405b1671a5beaae3266cc1af45 Mon Sep 17 00:00:00 2001
From: manuel <manuel@mausz.at>
Date: Wed, 6 Feb 2013 00:45:11 +0100
Subject: [PATCH] rewriteuser-0.1-qmail-smtpd

---
 qmail-smtpd.c | 42 ++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/qmail-smtpd.c b/qmail-smtpd.c
index 43570f4..b4c4ce2 100644
--- a/qmail-smtpd.c
+++ b/qmail-smtpd.c
@@ -858,7 +858,9 @@ static stralloc slop = {0};     /* b64 challenge */
 
 char **childargs;
 char ssauthbuf[512];
+char ssauth2buf[512];
 substdio ssauth = SUBSTDIO_FDBUF(safewrite,3,ssauthbuf,sizeof(ssauthbuf));
+substdio ssauth2 = SUBSTDIO_FDBUF(saferead,4,ssauth2buf,sizeof(ssauth2buf));
 
 int authgetl(void) {
   int i;
@@ -884,6 +886,9 @@ int authenticate(void)
   int child;
   int wstat;
   int pi[2];
+  int piauth[2], i, len;
+  char *arg;
+  static stralloc authout = {0}, authparams = {0};
 
   if (!stralloc_0(&user)) die_nomem();
   if (!stralloc_0(&pass)) die_nomem();
@@ -892,19 +897,24 @@ int authenticate(void)
 #endif
 
   if (pipe(pi) == -1) return err_pipe();
+  if (pipe(piauth) == -1) return err_pipe();
   switch(child = fork()) {
     case -1:
       return err_fork();
     case 0:
       close(pi[1]);
+      close(piauth[0]);
       if(fd_copy(3,pi[0]) == -1) return err_pipe();
+      if(fd_copy(4,piauth[1]) == -1) return err_pipe();
       sig_pipedefault();
         execvp(*childargs, childargs);
       _exit(1);
   }
   close(pi[0]);
+  close(piauth[1]);
 
   substdio_fdbuf(&ssauth,write,pi[1],ssauthbuf,sizeof ssauthbuf);
+  substdio_fdbuf(&ssauth2,read,piauth[0],ssauth2buf,sizeof ssauth2buf);
   if (substdio_put(&ssauth,user.s,user.len) == -1) return err_write();
   if (substdio_put(&ssauth,pass.s,pass.len) == -1) return err_write();
 #ifdef CRAM_MD5
@@ -913,11 +923,43 @@ int authenticate(void)
   if (substdio_flush(&ssauth) == -1) return err_write();
 
   close(pi[1]);
+
+  if (!stralloc_copys(&authout, "")) die_nomem();
+  for (;;) {
+    if (!stralloc_readyplus(&authout, 1)) die_nomem();
+    i = substdio_get(&ssauth2, authout.s + authout.len, 1);
+    if (i == 0) break;
+    ++authout.len;
+  }
+  authout.s[authout.len] = 0;
+  if (substdio_flush(&ssauth2) == -1) return err_write();
+  close(piauth[0]);
+
+  if (authout.len > 0) {
+    len = authout.len;
+    arg = authout.s;
+    if (!stralloc_copys(&authparams, "")) die_nomem;
+    while (len) {
+      if (*arg == '\0') {
+        if (case_starts(authparams.s, "USER=") && (authparams.len - 5) > 0) {
+          if (!stralloc_copyb(&user, authparams.s + 5, authparams.len - 5)) die_nomem();
+          if (!stralloc_0(&user)) die_nomem();
+        }
+        if (!stralloc_copys(&authparams, "")) die_nomem;
+      }
+      else
+        if (!stralloc_catb(&authparams, arg, 1)) die_nomem;
+      arg++;
+      len--;
+    }
+  }
+
 #ifdef CRAM_MD5
   if (!stralloc_copys(&chal,"")) die_nomem();
   if (!stralloc_copys(&slop,"")) die_nomem();
 #endif
   byte_zero(ssauthbuf,sizeof ssauthbuf);
+  byte_zero(ssauth2buf,sizeof ssauth2buf);
   if (wait_pid(&wstat,child) == -1) return err_child();
   if (wait_crashed(wstat)) return err_child();
   if (wait_exitcode(wstat)) { sleep(AUTHSLEEP); return 1; } /* no */
-- 
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