X-Git-Url: http://pileus.org/git/?a=blobdiff_plain;f=smtp.c;h=d831249243192b401831e4ce1ed7f93a0ce0f560;hb=98cfcef26048bba06975e68a1aad05a8bac0d65d;hp=733f7050451b0b3670c9f770443b54811e57032f;hpb=9d2e7f97454cd759c4c70a554c918caccc0b34a9;p=~andy%2Ffetchmail

diff --git a/smtp.c b/smtp.c
index 733f7050..d8312492 100644
--- a/smtp.c
+++ b/smtp.c
@@ -4,118 +4,377 @@
  * Concept due to Harry Hochheiser.  Implementation by ESR.  Cleanup and
  * strict RFC821 compliance by Cameron MacPherson.
  *
- * Copyright 1996 Eric S. Raymond
- * All rights reserved.
+ * Copyright 1997 Eric S. Raymond, 2009 Matthias Andree
  * For license terms, see the file COPYING in this directory.
  */
 
+#include "config.h"
+#include "fetchmail.h"
+
+#include <ctype.h>
 #include <stdio.h>
-#include <config.h>
-#include <sys/types.h>
 #include <unistd.h>
 #include <string.h>
+#include <signal.h>
 #include "socket.h"
-#include "fetchmail.h"
 #include "smtp.h"
+#include "gettext.h"
+
+struct opt
+{
+    const char *name;
+    int value;
+};
+
+static struct opt extensions[] =
+{
+    {"8BITMIME",	ESMTP_8BITMIME},
+    {"SIZE",    	ESMTP_SIZE},
+    {"ETRN",		ESMTP_ETRN},
+    {"AUTH ",		ESMTP_AUTH},
+#ifdef ODMR_ENABLE
+    {"ATRN",		ESMTP_ATRN},
+#endif /* ODMR_ENABLE */
+    {(char *)NULL, 0},
+};
 
-int smtp_response;	/* numeric value of SMTP response code */
+char smtp_response[MSGBUFSIZE];
 
-int SMTP_helo(FILE *sockfp,char *host)
+/* XXX: this must not be used for LMTP! */
+int SMTP_helo(int sock, char smtp_mode, const char *host)
 /* send a "HELO" message to the SMTP listener */
 {
   int ok;
 
-  fprintf(sockfp,"HELO %s\r\n", host);
-  if (outlevel == O_VERBOSE)
-      error(0, 0, "SMTP> HELO %s", host);
-  ok = SMTP_ok(sockfp);
+  SockPrintf(sock,"HELO %s\r\n", host);
+  if (outlevel >= O_MONITOR)
+      report(stdout, "%cMTP> HELO %s\n", smtp_mode, host);
+  ok = SMTP_ok(sock, smtp_mode, TIMEOUT_HELO);
   return ok;
 }
 
-int SMTP_from(FILE *sockfp, char *from)
+static void SMTP_auth_error(int sock, const char *msg)
+{
+    SockPrintf(sock, "*\r\n");
+    SockRead(sock, smtp_response, sizeof(smtp_response) - 1);
+    if (outlevel >= O_MONITOR) report(stdout, "%s", msg);
+}
+
+static void SMTP_auth(int sock, char smtp_mode, char *username, char *password, char *buf)
+/* ESMTP Authentication support for fetchmail by Wojciech Polak */
+{	
+	int c;
+	char *p = 0;
+	char b64buf[512];
+	char tmp[512];
+
+	if (!username || !password) return;
+
+	memset(b64buf, 0, sizeof(b64buf));
+	memset(tmp, 0, sizeof(tmp));
+
+	if (strstr(buf, "CRAM-MD5")) {
+		unsigned char digest[16];
+		memset(digest, 0, sizeof(digest));
+
+		if (outlevel >= O_MONITOR)
+			report(stdout, GT_("ESMTP CRAM-MD5 Authentication...\n"));
+		SockPrintf(sock, "AUTH CRAM-MD5\r\n");
+		SockRead(sock, smtp_response, sizeof(smtp_response) - 1);
+		strlcpy(tmp, smtp_response, sizeof(tmp));
+
+		if (strncmp(tmp, "334", 3)) { /* Server rejects AUTH */
+			SMTP_auth_error(sock, GT_("Server rejected the AUTH command.\n"));
+			return;
+		}
+
+		p = strchr(tmp, ' ');
+		p++;
+		/* (hmh) from64tobits will not NULL-terminate strings! */
+		if (from64tobits(b64buf, p, sizeof(b64buf) - 1) <= 0) {
+			SMTP_auth_error(sock, GT_("Bad base64 reply from server.\n"));
+			return;
+		}
+		if (outlevel >= O_DEBUG)
+			report(stdout, GT_("Challenge decoded: %s\n"), b64buf);
+		hmac_md5((unsigned char *)password, strlen(password),
+			 (unsigned char *)b64buf, strlen(b64buf), digest, sizeof(digest));
+		snprintf(tmp, sizeof(tmp),
+		"%s %02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x%02x",
+		username,  digest[0], digest[1], digest[2], digest[3],
+		digest[4], digest[5], digest[6], digest[7], digest[8],
+		digest[9], digest[10], digest[11], digest[12], digest[13],
+		digest[14], digest[15]);
+
+		to64frombits(b64buf, tmp, strlen(tmp));
+		SockPrintf(sock, "%s\r\n", b64buf);
+		SMTP_ok(sock, smtp_mode, TIMEOUT_DEFAULT);
+	}
+	else if (strstr(buf, "PLAIN")) {
+		int len;
+		if (outlevel >= O_MONITOR)
+			report(stdout, GT_("ESMTP PLAIN Authentication...\n"));
+		snprintf(tmp, sizeof(tmp), "^%s^%s", username, password);
+
+		len = strlen(tmp);
+		for (c = len - 1; c >= 0; c--)
+		{
+			if (tmp[c] == '^')
+				tmp[c] = '\0';
+		}
+		to64frombits(b64buf, tmp, len);
+		SockPrintf(sock, "AUTH PLAIN %s\r\n", b64buf);
+		SMTP_ok(sock, smtp_mode, TIMEOUT_DEFAULT);
+	}
+	else if (strstr(buf, "LOGIN")) {
+		if (outlevel >= O_MONITOR)
+			report(stdout, GT_("ESMTP LOGIN Authentication...\n"));
+		SockPrintf(sock, "AUTH LOGIN\r\n");
+		SockRead(sock, smtp_response, sizeof(smtp_response) - 1);
+		strlcpy(tmp, smtp_response, sizeof(tmp));
+
+		if (strncmp(tmp, "334", 3)) { /* Server rejects AUTH */
+			SMTP_auth_error(sock, GT_("Server rejected the AUTH command.\n"));
+			return;
+		}
+
+		p = strchr(tmp, ' ');
+		p++;
+		if (from64tobits(b64buf, p, sizeof(b64buf) - 1) <= 0) {
+			SMTP_auth_error(sock, GT_("Bad base64 reply from server.\n"));
+			return;
+		}
+		to64frombits(b64buf, username, strlen(username));
+		SockPrintf(sock, "%s\r\n", b64buf);
+		SockRead(sock, smtp_response, sizeof(smtp_response) - 1);
+		strlcpy(tmp, smtp_response, sizeof(tmp));
+		p = strchr(tmp, ' ');
+		if (!p) {
+			SMTP_auth_error(sock, GT_("Bad base64 reply from server.\n"));
+			return;
+		}
+		p++;
+		memset(b64buf, 0, sizeof(b64buf));
+		if (from64tobits(b64buf, p, sizeof(b64buf) - 1) <= 0) {
+			SMTP_auth_error(sock, GT_("Bad base64 reply from server.\n"));
+			return;
+		}
+		to64frombits(b64buf, password, strlen(password));
+		SockPrintf(sock, "%s\r\n", b64buf);
+		SMTP_ok(sock, smtp_mode, TIMEOUT_DEFAULT);
+	}
+	return;
+}
+
+int SMTP_ehlo(int sock, char smtp_mode, const char *host, char *name, char *password, int *opt)
+/* send a "EHLO" message to the SMTP listener, return extension status bits */
+{
+  struct opt *hp;
+  char auth_response[511];
+  SIGHANDLERTYPE alrmsave;
+  const int tmout = (mytimeout >= TIMEOUT_HELO ? mytimeout : TIMEOUT_HELO);
+
+  SockPrintf(sock,"%cHLO %s\r\n", (smtp_mode == 'S') ? 'E' : smtp_mode, host);
+  if (outlevel >= O_MONITOR)
+      report(stdout, "%cMTP> %cHLO %s\n", 
+	    smtp_mode, (smtp_mode == 'S') ? 'E' : smtp_mode, host);
+
+  alrmsave = set_signal_handler(SIGALRM, null_signal_handler);
+  set_timeout(tmout);
+
+  *opt = 0;
+  while ((SockRead(sock, smtp_response, sizeof(smtp_response)-1)) != -1)
+  {
+      size_t n;
+
+      set_timeout(0);
+      (void)set_signal_handler(SIGALRM, alrmsave);
+
+      n = strlen(smtp_response);
+      if (n > 0 && smtp_response[n-1] == '\n')
+	  smtp_response[--n] = '\0';
+      if (n > 0 && smtp_response[n-1] == '\r')
+	  smtp_response[--n] = '\0';
+      if (n < 4)
+	  return SM_ERROR;
+      smtp_response[n] = '\0';
+      if (outlevel >= O_MONITOR)
+	  report(stdout, "%cMTP< %s\n", smtp_mode, smtp_response);
+      for (hp = extensions; hp->name; hp++)
+	  if (!strncasecmp(hp->name, smtp_response+4, strlen(hp->name))) {
+	      *opt |= hp->value;
+	      if (strncmp(hp->name, "AUTH ", 5) == 0)
+		strncpy(auth_response, smtp_response, sizeof(auth_response));
+		auth_response[sizeof(auth_response)-1] = '\0';
+	  }
+      if ((smtp_response[0] == '1' || smtp_response[0] == '2' || smtp_response[0] == '3') && smtp_response[3] == ' ') {
+	  if (*opt & ESMTP_AUTH)
+		SMTP_auth(sock, smtp_mode, name, password, auth_response);
+	  return SM_OK;
+      }
+      else if (smtp_response[3] != '-')
+	  return SM_ERROR;
+
+      alrmsave = set_signal_handler(SIGALRM, null_signal_handler);
+      set_timeout(tmout);
+  }
+  return SM_UNRECOVERABLE;
+}
+
+int SMTP_from(int sock, char smtp_mode, const char *from, const char *opts)
 /* send a "MAIL FROM:" message to the SMTP listener */
 {
-  int ok;
+    int ok;
+    char buf[MSGBUFSIZE];
 
-  fprintf(sockfp,"MAIL FROM:<%s>\r\n", from);
-  if (outlevel == O_VERBOSE)
-      error(0, 0, "SMTP> MAIL FROM:<%s>", from);
-  ok = SMTP_ok(sockfp);
-  return ok;
+    if (from[0]=='<')
+	snprintf(buf, sizeof(buf), "MAIL FROM:%s", from);
+    else
+	snprintf(buf, sizeof(buf), "MAIL FROM:<%s>", from);
+    if (opts)
+	snprintf(buf+strlen(buf), sizeof(buf)-strlen(buf), "%s", opts);
+    SockPrintf(sock,"%s\r\n", buf);
+    if (outlevel >= O_MONITOR)
+	report(stdout, "%cMTP> %s\n", smtp_mode, buf);
+    ok = SMTP_ok(sock, smtp_mode, TIMEOUT_MAIL);
+    return ok;
 }
 
-int SMTP_rcpt(FILE *sockfp, char *to)
+int SMTP_rcpt(int sock, char smtp_mode, const char *to)
 /* send a "RCPT TO:" message to the SMTP listener */
 {
   int ok;
 
-  fprintf(sockfp,"RCPT TO:<%s>\r\n", to);
-  if (outlevel == O_VERBOSE)
-      error(0, 0, "SMTP> RCPT TO:<%s>", to);
-  ok = SMTP_ok(sockfp);
+  SockPrintf(sock,"RCPT TO:<%s>\r\n", to);
+  if (outlevel >= O_MONITOR)
+      report(stdout, "%cMTP> RCPT TO:<%s>\n", smtp_mode, to);
+  ok = SMTP_ok(sock, smtp_mode, TIMEOUT_RCPT);
   return ok;
 }
 
-int SMTP_data(FILE *sockfp)
+int SMTP_data(int sock, char smtp_mode)
 /* send a "DATA" message to the SMTP listener */
 {
   int ok;
 
-  fprintf(sockfp,"DATA\r\n");
-  if (outlevel == O_VERBOSE)
-      error(0, 0, "SMTP> DATA");
-  ok = SMTP_ok(sockfp);
+  SockPrintf(sock,"DATA\r\n");
+  if (outlevel >= O_MONITOR)
+      report(stdout, "%cMTP> DATA\n", smtp_mode);
+  ok = SMTP_ok(sock, smtp_mode, TIMEOUT_DATA);
   return ok;
 }
 
-int SMTP_quit(FILE *sockfp)
-/* send a "QUIT" message to the SMTP listener */
+int SMTP_rset(int sock, char smtp_mode)
+/* send a "RSET" message to the SMTP listener */
 {
   int ok;
 
-  fprintf(sockfp,"QUIT\r\n");
-  if (outlevel == O_VERBOSE)
-      error(0, 0, "SMTP> QUIT");
-  ok = SMTP_ok(sockfp);
+  SockPrintf(sock,"RSET\r\n");
+  if (outlevel >= O_MONITOR)
+      report(stdout, "%cMTP> RSET\n", smtp_mode);
+  ok = SMTP_ok(sock, smtp_mode, TIMEOUT_DEFAULT);
   return ok;
 }
 
-int SMTP_eom(FILE *sockfp)
-/* send a message data terminator to the SMTP listener */
+int SMTP_quit(int sock, char smtp_mode)
+/* send a "QUIT" message to the SMTP listener */
 {
   int ok;
 
-  fprintf(sockfp,".\r\n");
-  if (outlevel == O_VERBOSE)
-      error(0, 0, "SMTP>. (EOM)");
-  ok = SMTP_ok(sockfp);
+  SockPrintf(sock,"QUIT\r\n");
+  if (outlevel >= O_MONITOR)
+      report(stdout, "%cMTP> QUIT\n", smtp_mode);
+  ok = SMTP_ok(sock, smtp_mode, TIMEOUT_DEFAULT);
   return ok;
 }
 
-int SMTP_ok(FILE *sockfp)
-/* returns status of SMTP connection */
+int SMTP_eom(int sock, char smtp_mode)
+/* send a message data terminator to the SMTP listener */
+{
+  SockPrintf(sock,".\r\n");
+  if (outlevel >= O_MONITOR)
+      report(stdout, "%cMTP>. (EOM)\n", smtp_mode);
+
+  /* 
+   * When doing LMTP, must process many of these at the outer level. 
+   */
+  if (smtp_mode == 'S')
+      return SMTP_ok(sock, smtp_mode, TIMEOUT_EOM);
+  else
+      return SM_OK;
+}
+
+time_t last_smtp_ok = 0;
+
+int SMTP_ok(int sock, char smtp_mode, int mintimeout)
+/**< returns status of SMTP connection and saves the message in
+ * smtp_response, without trailing [CR]LF, but with normalized CRLF
+ * between multiple lines of multi-line replies */
 {
-    char buf[SMTPBUFSIZE], *ip;
-  
-    while ((ip = fgets(buf, sizeof(buf)-1, sockfp)))
+    SIGHANDLERTYPE alrmsave;
+    char reply[MSGBUFSIZE], *i;
+
+    /* set an alarm for smtp ok */
+    alrmsave = set_signal_handler(SIGALRM, null_signal_handler);
+    set_timeout(mytimeout >= mintimeout ? mytimeout : mintimeout);
+
+    smtp_response[0] = '\0';
+
+    while ((SockRead(sock, reply, sizeof(reply)-1)) != -1)
     {
-	int  n = strlen(ip);
+	size_t n;
 
-	if (buf[strlen(buf)-1] == '\n')
-	    buf[strlen(buf)-1] = '\0';
-	if (buf[strlen(buf)-1] == '\r')
-	    buf[strlen(buf)-1] = '\r';
-	if (n < 4)
-	    return SM_ERROR;
-	buf[n] = '\0';
-	if (outlevel == O_VERBOSE)
-	    error(0, 0, "SMTP< %s", buf);
-	smtp_response = atoi(buf);
-	if ((buf[0] == '1' || buf[0] == '2' || buf[0] == '3') && buf[3] == ' ')
+	/* restore alarm */
+	set_timeout(0);
+	set_signal_handler(SIGALRM, alrmsave);
+
+	n = strlen(reply);
+	if (n > 0 && reply[n-1] == '\n')
+	    reply[--n] = '\0';
+	if (n > 0 && reply[n-1] == '\r')
+	    reply[--n] = '\0';
+
+	/* stomp over control characters */
+	for (i = reply; *i; i++)
+	    if (iscntrl((unsigned char)*i))
+		*i = '?';
+
+	if (outlevel >= O_MONITOR)
+	    report(stdout, "%cMTP< %s\n", smtp_mode, reply);
+	/* note that \0 is part of the strchr search string and the
+	 * blank after the reply code is optional (RFC 5321 4.2.1) */
+	if (n < 3 || !strchr(" -", reply[3]))
+	{
+	    if (outlevel >= O_MONITOR)
+		report(stderr, GT_("smtp listener protocol error\n"));
+	    return SM_UNRECOVERABLE;
+	}
+
+	last_smtp_ok = time((time_t *) NULL);
+
+	strlcat(smtp_response, reply,  sizeof(smtp_response));
+
+	if (strchr("123", reply[0])
+		&& isdigit((unsigned char)reply[1])
+		&& isdigit((unsigned char)reply[2])
+		&& strchr(" ", reply[3])) /* matches space and \0 */ {
 	    return SM_OK;
-	else if (buf[3] != '-')
+	} else if (reply[3] != '-')
 	    return SM_ERROR;
+
+	strlcat(smtp_response, "\r\n", sizeof(smtp_response));
+
+	/* set an alarm for smtp ok */
+	set_signal_handler(SIGALRM, null_signal_handler);
+	set_timeout(mytimeout);
     }
+
+    /* restore alarm */
+    set_timeout(0);
+    set_signal_handler(SIGALRM, alrmsave);
+
+    if (outlevel >= O_MONITOR)
+	report(stderr, GT_("smtp listener protocol error\n"));
     return SM_UNRECOVERABLE;
 }