* Add file ssl_win.c, which is necessary for the compilation of

     PC-Alpine.

1 files changed, 742 insertions, 0 deletions

diff --git a/imap/src/osdep/nt/ssl_win.c b/imap/src/osdep/nt/ssl_win.c
new file mode 100644
index 00000000..783c080a
--- /dev/null
+++ b/imap/src/osdep/nt/ssl_win.c
@@ -0,0 +1,742 @@
+/* ========================================================================
+ * Copyright 2018 Eduardo Chappa
+ * Copyright 2008-2009 Mark Crispin
+ * ========================================================================
+ */
+
+/*
+ * Program:	SSL authentication/encryption module for Windows 9x and NT
+ *
+ * Author:	Mark Crispin
+ *
+ * Date:	22 September 1998
+ * Last Edited:	8 November 2009
+ *
+ * Previous versions of this file were
+ *
+ * Copyright 1988-2008 University of Washington
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ */
+#define SECURITY_WIN32
+#include <sspi.h>
+#include <schannel.h>
+
+
+#define SSLBUFLEN 8192
+
+
+/* SSL I/O stream */
+
+typedef struct ssl_stream {
+  TCPSTREAM *tcpstream;		/* TCP stream */
+  CredHandle cred;		/* SSL credentials */
+  CtxtHandle context;		/* SSL context */
+				/* stream encryption sizes */
+  SecPkgContext_StreamSizes sizes;
+  size_t bufsize;
+  int ictr;			/* input counter */
+  char *iptr;			/* input pointer */
+  int iextractr;		/* extra input counter */
+  char *iextraptr;		/* extra input pointer */
+  char *ibuf;			/* input buffer */
+  char *obuf;			/* output buffer */
+} SSLSTREAM;
+
+#include "sslio.h"
+
+
+/* Function prototypes */
+
+static SSLSTREAM *ssl_start(TCPSTREAM *tstream,char *host,unsigned long flags);
+static char *ssl_analyze_status (SECURITY_STATUS err,char *buf);
+static char *ssl_getline_work (SSLSTREAM *stream,unsigned long *size,
+			       long *contd);
+static long ssl_abort (SSLSTREAM *stream);
+
+/* Secure Sockets Layer network driver dispatch */
+
+static struct ssl_driver ssldriver = {
+  ssl_open,			/* open connection */
+  ssl_aopen,			/* open preauthenticated connection */
+  ssl_getline,			/* get a line */
+  ssl_getbuffer,		/* get a buffer */
+  ssl_soutr,			/* output pushed data */
+  ssl_sout,			/* output string */
+  ssl_close,			/* close connection */
+  ssl_host,			/* return host name */
+  ssl_remotehost,		/* return remote host name */
+  ssl_port,			/* return port number */
+  ssl_localhost,		/* return local host name */
+  ssl_getsize			/* return buffer size */			
+};
+
+				/* security function table */
+static SecurityFunctionTable *sft = NIL;
+static unsigned long ssltsz = 0;/* SSL maximum token length */
+
+
+/* Define crypt32.dll stuff here in case a pre-IE5 Win9x system */
+
+typedef DWORD (CALLBACK *CNTS) (DWORD,PCERT_NAME_BLOB,DWORD,LPSTR,DWORD);
+typedef BOOL (CALLBACK *CGCC) (HCERTCHAINENGINE,PCCERT_CONTEXT,LPFILETIME,
+			       HCERTSTORE,PCERT_CHAIN_PARA,DWORD,LPVOID,
+			       PCCERT_CHAIN_CONTEXT *);
+typedef BOOL (CALLBACK *CVCCP) (LPCSTR,PCCERT_CHAIN_CONTEXT,
+				PCERT_CHAIN_POLICY_PARA,
+				PCERT_CHAIN_POLICY_STATUS);
+typedef VOID (CALLBACK *CFCC) (PCCERT_CHAIN_CONTEXT);
+typedef BOOL (CALLBACK *CFCCX) (PCCERT_CONTEXT);
+
+static CNTS certNameToStr = NIL;
+static CGCC certGetCertificateChain = NIL;
+static CVCCP certVerifyCertificateChainPolicy = NIL;
+static CFCC certFreeCertificateChain = NIL;
+static CFCCX certFreeCertificateContext = NIL;
+
+/* One-time SSL initialization */
+
+static int sslonceonly = 0;
+
+void ssl_onceonlyinit (void)
+{
+  if (!sslonceonly++) {		/* only need to call it once */
+    HINSTANCE lib;
+    FARPROC pi;
+    ULONG np;
+    SecPkgInfo *pp;
+    int i;
+				/* get security library */
+    if (((lib = LoadLibrary ("schannel.dll")) ||
+	 (lib = LoadLibrary ("security.dll"))) &&
+	(pi = GetProcAddress (lib,SECURITY_ENTRYPOINT)) &&
+	(sft = (SecurityFunctionTable *) pi ()) &&
+	!(sft->EnumerateSecurityPackages (&np,&pp))) {
+				/* look for an SSL package */
+      for (i = 0; (i < (int) np); i++) if (!strcmp (pp[i].Name,UNISP_NAME)) {
+				/* note maximum token size and name */
+	ssltsz = pp[i].cbMaxToken;
+				/* apply runtime linkage */
+	mail_parameters (NIL,SET_SSLDRIVER,(void *) &ssldriver);
+	mail_parameters (NIL,SET_SSLSTART,(void *) ssl_start);
+	if ((lib = LoadLibrary ("crypt32.dll")) &&
+	    (certGetCertificateChain = (CGCC)
+	     GetProcAddress (lib,"CertGetCertificateChain")) &&
+	    (certVerifyCertificateChainPolicy = (CVCCP)
+	     GetProcAddress (lib,"CertVerifyCertificateChainPolicy")) &&
+	    (certFreeCertificateChain = (CFCC)
+	     GetProcAddress (lib,"CertFreeCertificateChain")) &&
+	    (certFreeCertificateContext = (CFCCX)
+	     GetProcAddress (lib,"CertFreeCertificateContext")))
+	  certNameToStr = (CNTS) GetProcAddress (lib,"CertNameToStrA");
+	return;			/* all done */
+      }
+    }
+  }
+}
+
+/* SSL open
+ * Accepts: host name
+ *	    contact service name
+ *	    contact port number
+ * Returns: SSL stream if success else NIL
+ */
+
+SSLSTREAM *ssl_open (char *host,char *service,unsigned long port)
+{
+  TCPSTREAM *stream = tcp_open (host,service,port);
+  return stream ? ssl_start (stream,host,port) : NIL;
+}
+
+  
+/* SSL authenticated open
+ * Accepts: host name
+ *	    service name
+ *	    returned user name buffer
+ * Returns: SSL stream if success else NIL
+ */
+
+SSLSTREAM *ssl_aopen (NETMBX *mb,char *service,char *usrbuf)
+{
+  return NIL;			/* don't use this mechanism with SSL */
+}
+
+/* Start SSL/TLS negotiations
+ * Accepts: open TCP stream of session
+ *	    user's host name
+ *	    flags
+ * Returns: SSL stream if success else NIL
+ */
+
+static SSLSTREAM *ssl_start (TCPSTREAM *tstream,char *host,unsigned long flags)
+{
+  SECURITY_STATUS e;
+  ULONG a;
+  TimeStamp t;
+  SecBuffer ibuf[2],obuf[1];
+  SecBufferDesc ibufs,obufs;
+  SCHANNEL_CRED tlscred;
+  CERT_CONTEXT *cert = NIL;
+  CERT_CHAIN_PARA chparam;
+  CERT_CHAIN_CONTEXT *chain;
+  SSL_EXTRA_CERT_CHAIN_POLICY_PARA policy;
+  CERT_CHAIN_POLICY_PARA polparam;
+  CERT_CHAIN_POLICY_STATUS status;
+  char tmp[MAILTMPLEN],certname[256];
+  char *reason = NIL;
+  ULONG req = ISC_REQ_REPLAY_DETECT | ISC_REQ_SEQUENCE_DETECT |
+    ISC_REQ_CONFIDENTIALITY | ISC_REQ_USE_SESSION_KEY |
+      ISC_REQ_ALLOCATE_MEMORY | ISC_REQ_STREAM | ISC_REQ_EXTENDED_ERROR |
+	ISC_REQ_MANUAL_CRED_VALIDATION;
+  LPSTR usage[] = {
+    szOID_PKIX_KP_SERVER_AUTH,
+    szOID_SERVER_GATED_CRYPTO,
+    szOID_SGC_NETSCAPE
+  };
+  PWSTR whost = NIL;
+  char *buf = (char *) fs_get (ssltsz);
+  unsigned long size = 0;
+  sslcertificatequery_t scq =
+    (sslcertificatequery_t) mail_parameters (NIL,GET_SSLCERTIFICATEQUERY,NIL);
+  sslfailure_t sf = (sslfailure_t) mail_parameters (NIL,GET_SSLFAILURE,NIL);
+  SSLSTREAM *stream = (SSLSTREAM *) memset (fs_get (sizeof (SSLSTREAM)),0,
+					    sizeof (SSLSTREAM));
+  stream->tcpstream = tstream;	/* bind TCP stream */
+				/* initialize TLS credential */
+  memset (&tlscred,0,sizeof (SCHANNEL_CRED));
+  tlscred.dwVersion = SCHANNEL_CRED_VERSION;
+  tlscred.grbitEnabledProtocols = SP_PROT_TLS1;
+
+				/* acquire credentials */
+  if (sft->AcquireCredentialsHandle
+      (NIL,UNISP_NAME,SECPKG_CRED_OUTBOUND,NIL,(flags & NET_TLSCLIENT) ?
+       &tlscred : NIL,NIL,NIL,&stream->cred,&t)
+      != SEC_E_OK) reason = "Acquire credentials handle failed";
+  else while (!reason) {	/* negotiate security context */
+				/* initialize buffers */
+    ibuf[0].cbBuffer = size; ibuf[0].pvBuffer = buf;
+    ibuf[1].cbBuffer = 0; ibuf[1].pvBuffer = NIL;
+    obuf[0].cbBuffer = 0; obuf[0].pvBuffer = NIL;
+    ibuf[0].BufferType = obuf[0].BufferType = SECBUFFER_TOKEN;
+    ibuf[1].BufferType = SECBUFFER_EMPTY;
+				/* initialize buffer descriptors */
+    ibufs.ulVersion = obufs.ulVersion = SECBUFFER_VERSION;
+    ibufs.cBuffers = 2; obufs.cBuffers = 1;
+    ibufs.pBuffers = ibuf; obufs.pBuffers = obuf;
+				/* negotiate security */
+    e = sft->InitializeSecurityContext
+      (&stream->cred,size ? &stream->context : NIL,host,req,0,
+       SECURITY_NETWORK_DREP,size? &ibufs:NIL,0,&stream->context,&obufs,&a,&t);
+				/* have an output buffer we need to send? */
+    if (obuf[0].pvBuffer && obuf[0].cbBuffer) {
+      if (!tcp_sout (stream->tcpstream,obuf[0].pvBuffer,obuf[0].cbBuffer))
+	reason = "Unexpected TCP output disconnect";
+				/* free the buffer */
+      sft->FreeContextBuffer (obuf[0].pvBuffer);
+    }
+    if (!reason) switch (e) {	/* negotiation state */
+    case SEC_I_INCOMPLETE_CREDENTIALS:
+      break;			/* server wants client auth */
+    case SEC_I_CONTINUE_NEEDED:
+      if (size) {		/* continue, read any data? */
+				/* yes, anything regurgiated back to us? */
+	if (ibuf[1].BufferType == SECBUFFER_EXTRA) {
+				/* yes, set this as the new data */
+	  memmove (buf,buf + size - ibuf[1].cbBuffer,ibuf[1].cbBuffer);
+	  size = ibuf[1].cbBuffer;
+	  break;
+	}
+	size = 0;		/* otherwise, read more stuff from server */
+      }
+    case SEC_E_INCOMPLETE_MESSAGE:
+				/* need to read more data from server */
+      if (!tcp_getdata (stream->tcpstream))
+	reason = "Unexpected TCP input disconnect";
+      else {
+	memcpy (buf+size,stream->tcpstream->iptr,stream->tcpstream->ictr);
+	size += stream->tcpstream->ictr;
+				/* empty it from TCP's buffers */
+	stream->tcpstream->iptr += stream->tcpstream->ictr;
+	stream->tcpstream->ictr = 0;
+      }
+      break;
+
+    case SEC_E_OK:		/* success, any data to be regurgitated? */
+      if (ibuf[1].BufferType == SECBUFFER_EXTRA) {
+				/* yes, set this as the new data */
+	memmove (stream->tcpstream->iptr = stream->tcpstream->ibuf,
+		 buf + size - ibuf[1].cbBuffer,ibuf[1].cbBuffer);
+	stream->tcpstream->ictr = ibuf[1].cbBuffer;
+      }
+      if (certNameToStr && !(flags & NET_NOVALIDATECERT)) {
+				/* need validation, make wchar of host */
+	if (!((size = MultiByteToWideChar (CP_ACP,0,host,-1,NIL,0)) &&
+	      (whost = (PWSTR) fs_get (size*sizeof (WCHAR))) &&
+	      MultiByteToWideChar (CP_ACP,0,host,-1,whost,size)))
+	  fatal ("Can't make wchar of host name!");
+				/* get certificate */
+	if ((sft->QueryContextAttributes
+	     (&stream->context,SECPKG_ATTR_REMOTE_CERT_CONTEXT,&cert) !=
+	     SEC_E_OK) || !cert) {
+	  reason = "*Unable to get certificate";
+	  strcpy (certname,"<no certificate>");
+	}
+	else {			/* get certificate subject name */
+	  (*certNameToStr) (X509_ASN_ENCODING | PKCS_7_ASN_ENCODING,
+			    &cert->pCertInfo->Subject,CERT_X500_NAME_STR,
+			    certname,255);
+				/* build certificate chain */
+	  memset (&chparam,0,sizeof (chparam));
+	  chparam.cbSize = sizeof (chparam);
+	  chparam.RequestedUsage.dwType = USAGE_MATCH_TYPE_OR;
+	  chparam.RequestedUsage.Usage.rgpszUsageIdentifier = usage;
+	  chparam.RequestedUsage.Usage.cUsageIdentifier =
+	    sizeof (usage) / sizeof (LPSTR);
+	  if (!(*certGetCertificateChain)
+	      (NIL,cert,NIL,cert->hCertStore,&chparam,NIL,NIL,&chain))
+	    reason = ssl_analyze_status (GetLastError (),tmp);
+	  else {		/* validate certificate chain */
+	    memset (&policy,0,sizeof (SSL_EXTRA_CERT_CHAIN_POLICY_PARA));
+	    policy.cbStruct = sizeof (SSL_EXTRA_CERT_CHAIN_POLICY_PARA);
+	    policy.dwAuthType = AUTHTYPE_SERVER;
+	    policy.fdwChecks = NIL;
+	    policy.pwszServerName = whost;
+	    memset (&polparam,0,sizeof (polparam));
+	    polparam.cbSize = sizeof (polparam);
+	    polparam.pvExtraPolicyPara = &policy;
+	    memset (&status,0,sizeof (status));
+	    status.cbSize = sizeof (status);
+	    if (!(*certVerifyCertificateChainPolicy)
+		(CERT_CHAIN_POLICY_SSL,chain,&polparam,&status))
+	      reason = ssl_analyze_status (GetLastError (),tmp);
+	    else if (status.dwError)
+	      reason = ssl_analyze_status (status.dwError,tmp);
+	    (*certFreeCertificateChain) (chain);
+	  }
+	  (*certFreeCertificateContext) (cert);
+	}
+	if (whost) fs_give ((void **) &whost);
+
+	if (reason) {		/* got an error? */
+				/* application callback */
+	  if (scq) reason = (*scq) ((*reason == '*') ? reason + 1 : reason,
+				    host,certname) ? NIL : "";
+	  else if (*certname) {	/* error message to return via mm_log() */
+	    sprintf (buf,"*%.128s: %.255s",
+		     (*reason == '*') ? reason + 1 : reason,certname);
+	    reason = buf;
+	  }
+	}
+      }
+      if (reason ||
+	  (reason = ssl_analyze_status
+	   (sft->QueryContextAttributes
+	    (&stream->context,SECPKG_ATTR_STREAM_SIZES,&stream->sizes),buf)))
+	break;			/* error in certificate or getting sizes */
+      fs_give ((void **) &buf);	/* flush temporary buffer */
+				/* make maximum-sized buffers */
+      stream->bufsize = stream->sizes.cbHeader +
+	stream->sizes.cbMaximumMessage + stream->sizes.cbTrailer;
+      if (stream->sizes.cbMaximumMessage < SSLBUFLEN)
+	fatal ("cbMaximumMessage is less than SSLBUFLEN!");
+      else if (stream->sizes.cbMaximumMessage < 16384) {
+	sprintf (tmp,"WINDOWS BUG: cbMaximumMessage = %ld, should be 16384",
+		 (long) stream->sizes.cbMaximumMessage);
+	mm_log (tmp,NIL);
+      }
+      stream->ibuf = (char *) fs_get (stream->bufsize);
+      stream->obuf = (char *) fs_get (stream->bufsize);
+      return stream;
+    default:
+      reason = ssl_analyze_status (e,buf);
+    }
+  }
+  ssl_close (stream);		/* failed to do SSL */
+  stream = NIL;			/* no stream returned */
+  switch (*reason) {		/* analyze reason */
+  case '*':			/* certificate failure */
+    ++reason;			/* skip over certificate failure indication */
+				/* pass to error callback */
+    if (sf) (*sf) (host,reason,flags);
+    else {			/* no error callback, build error message */
+      sprintf (tmp,"Certificate failure for %.80s: %.512s",host,reason);
+      mm_log (tmp,ERROR);
+    }
+  case '\0':			/* user answered no to certificate callback */
+    if (flags & NET_TRYSSL)	/* return dummy stream to stop tryssl */
+      stream = (SSLSTREAM *) memset (fs_get (sizeof (SSLSTREAM)),0,
+				     sizeof (SSLSTREAM));
+    break;
+  default:			/* non-certificate failure */
+    if (flags & NET_TRYSSL);	/* no error output if tryssl */
+				/* pass to error callback */
+    else if (sf) (*sf) (host,reason,flags);
+    else {			/* no error callback, build error message */
+      sprintf (tmp,"TLS/SSL failure for %.80s: %.512s",host,reason);
+      mm_log (tmp,ERROR);
+    }
+    break;
+  }
+  fs_give ((void **) &buf);	/* flush temporary buffer */
+  return stream;
+}
+
+/* Generate error text from SSL error code
+ * Accepts: SSL status
+ *	    scratch buffer
+ * Returns: text if error status, else NIL
+ */
+
+static char *ssl_analyze_status (SECURITY_STATUS err,char *buf)
+{
+  switch (err) {
+  case SEC_E_OK:		/* no error */
+  case SEC_I_CONTINUE_NEEDED:
+  case SEC_I_INCOMPLETE_CREDENTIALS:
+  case SEC_E_INCOMPLETE_MESSAGE:
+    return NIL;
+  case SEC_E_NO_AUTHENTICATING_AUTHORITY:
+    mm_log ("unexpected SEC_E_NO_AUTHENTICATING_AUTHORITY",NIL);
+    return "*No authority could be contacted for authentication";
+  case SEC_E_WRONG_PRINCIPAL:
+    mm_log ("unexpected SEC_E_WRONG_PRINCIPAL",NIL);
+  case CERT_E_CN_NO_MATCH:
+    return "*Server name does not match certificate";
+  case SEC_E_UNTRUSTED_ROOT:
+    mm_log ("unexpected SEC_E_UNTRUSTED_ROOT",NIL);
+  case CERT_E_UNTRUSTEDROOT:
+    return "*Self-signed certificate or untrusted authority";
+  case SEC_E_CERT_EXPIRED:
+    mm_log ("unexpected SEC_E_CERT_EXPIRED",NIL);
+  case CERT_E_EXPIRED:
+    return "*Certificate has expired";
+  case CERT_E_REVOKED:
+    return "*Certificate revoked";
+  case SEC_E_INVALID_TOKEN:
+    return "Invalid token, probably not an SSL server";
+  case SEC_E_UNSUPPORTED_FUNCTION:
+    return "SSL not supported on this machine - upgrade your system software";
+  }
+  sprintf (buf,"Unexpected SSPI or certificate error %lx - report this",err);
+  return buf;
+}
+
+/* SSL receive line
+ * Accepts: SSL stream
+ * Returns: text line string or NIL if failure
+ */
+
+char *ssl_getline (SSLSTREAM *stream)
+{
+  unsigned long n,contd;
+  char *ret = ssl_getline_work (stream,&n,&contd);
+  if (ret && contd) {		/* got a line needing continuation? */
+    STRINGLIST *stl = mail_newstringlist ();
+    STRINGLIST *stc = stl;
+    do {			/* collect additional lines */
+      stc->text.data = (unsigned char *) ret;
+      stc->text.size = n;
+      stc = stc->next = mail_newstringlist ();
+      ret = ssl_getline_work (stream,&n,&contd);
+    } while (ret && contd);
+    if (ret) {			/* stash final part of line on list */
+      stc->text.data = (unsigned char *) ret;
+      stc->text.size = n;
+				/* determine how large a buffer we need */
+      for (n = 0, stc = stl; stc; stc = stc->next) n += stc->text.size;
+      ret = fs_get (n + 1);	/* copy parts into buffer */
+      for (n = 0, stc = stl; stc; n += stc->text.size, stc = stc->next)
+	memcpy (ret + n,stc->text.data,stc->text.size);
+      ret[n] = '\0';
+    }
+    mail_free_stringlist (&stl);/* either way, done with list */
+  }
+  return ret;
+}
+
+/* SSL receive line or partial line
+ * Accepts: SSL stream
+ *	    pointer to return size
+ *	    pointer to return continuation flag
+ * Returns: text line string, size and continuation flag, or NIL if failure
+ */
+
+static char *ssl_getline_work (SSLSTREAM *stream,unsigned long *size,
+			       long *contd)
+{
+  unsigned long n;
+  char *s,*ret,c,d;
+  *contd = NIL;			/* assume no continuation */
+				/* make sure have data */
+  if (!ssl_getdata (stream)) return NIL;
+  for (s = stream->iptr, n = 0, c = '\0'; stream->ictr--; n++, c = d) {
+    d = *stream->iptr++;	/* slurp another character */
+    if ((c == '\015') && (d == '\012')) {
+      ret = (char *) fs_get (n--);
+      memcpy (ret,s,*size = n);	/* copy into a free storage string */
+      ret[n] = '\0';		/* tie off string with null */
+      return ret;
+    }
+  }
+				/* copy partial string from buffer */
+  memcpy ((ret = (char *) fs_get (n)),s,*size = n);
+				/* get more data from the net */
+  if (!ssl_getdata (stream)) fs_give ((void **) &ret);
+				/* special case of newline broken by buffer */
+  else if ((c == '\015') && (*stream->iptr == '\012')) {
+    stream->iptr++;		/* eat the line feed */
+    stream->ictr--;
+    ret[*size = --n] = '\0';	/* tie off string with null */
+  }
+  else *contd = LONGT;		/* continuation needed */
+  return ret;
+}
+
+char* ssl_getsize(SSLSTREAM* stream, unsigned long size)
+{
+    char* ret = NIL;
+    unsigned long got = 0L, need = size, n;
+    int done = 0;
+
+    while (!done) {
+        if (!ssl_getdata(stream)) return ret;      /* return what we have */
+        n = stream->ictr < need ? stream->ictr : need;
+        fs_resize((void**)&ret, got + n + 1);
+        memcpy(ret + got, stream->iptr, n);
+        ret[got + n] = '\0';
+        got += n;
+        need -= n;
+        stream->iptr += n;
+        stream->ictr -= n;
+        if (need == 0L) done++;
+    }
+
+    return ret;
+}
+
+/* SSL receive buffer
+ * Accepts: SSL stream
+ *	    size in bytes
+ *	    buffer to read into
+ * Returns: T if success, NIL otherwise
+ */
+
+long ssl_getbuffer (SSLSTREAM *stream,unsigned long size,char *buffer)
+{
+  unsigned long n;
+  while (size > 0) {		/* until request satisfied */
+    if (!ssl_getdata (stream)) return NIL;
+    n = min (size,stream->ictr);/* number of bytes to transfer */
+				/* do the copy */
+    memcpy (buffer,stream->iptr,n);
+    buffer += n;		/* update pointer */
+    stream->iptr += n;
+    size -= n;			/* update # of bytes to do */
+    stream->ictr -= n;
+  }
+  buffer[0] = '\0';		/* tie off string */
+  return T;
+}
+
+/* SSL receive data
+ * Accepts: TCP/IP stream
+ * Returns: T if success, NIL otherwise
+ */
+
+long ssl_getdata (SSLSTREAM *stream)
+{
+  while (stream->ictr < 1) {	/* decrypted buffer empty? */
+    SECURITY_STATUS status;
+    SecBuffer buf[4];
+    SecBufferDesc msg;
+    size_t i;
+    size_t n = 0;		/* initially no bytes to decrypt */
+    if (!stream->tcpstream) return NIL;
+    do {			/* yes, make sure have data from TCP */
+      if (stream->iextractr) {	/* have previous unread data? */
+	memcpy (stream->ibuf + n,stream->iextraptr,stream->iextractr);
+	n += stream->iextractr;	/* update number of bytes read */
+	stream->iextractr = 0;	/* no more extra data */
+      }
+      else {			/* read from TCP */
+	if (!tcp_getdata (stream->tcpstream)) return ssl_abort (stream);
+				/* maximum amount of data to copy */
+	if (!(i = min (stream->bufsize - n,stream->tcpstream->ictr)))
+	  fatal ("incomplete SecBuffer exceeds maximum buffer size");
+				/* do the copy */
+	memcpy (stream->ibuf + n,stream->tcpstream->iptr,i);
+	stream->tcpstream->iptr += i;
+	stream->tcpstream->ictr -= i;
+	n += i;			/* update number of bytes to decrypt */
+      }
+      buf[0].cbBuffer = n;	/* first SecBuffer gets data */
+      buf[0].pvBuffer = stream->ibuf;
+      buf[0].BufferType = SECBUFFER_DATA;
+				/* subsequent ones are for spares */
+      buf[1].BufferType = buf[2].BufferType = buf[3].BufferType =
+	SECBUFFER_EMPTY;
+      msg.ulVersion = SECBUFFER_VERSION;
+      msg.cBuffers = 4;		/* number of SecBuffers */
+      msg.pBuffers = buf;	/* first SecBuffer */
+
+    } while ((status = ((DECRYPT_MESSAGE_FN) sft->Reserved4)
+	      (&stream->context,&msg,0,NIL)) == SEC_E_INCOMPLETE_MESSAGE);
+    switch (status) {
+    case SEC_E_OK:		/* won */
+    case SEC_I_RENEGOTIATE:	/* won but lost it after this buffer */
+				/* hunt for a buffer */
+      for (i = 0; (i < 4) && (buf[i].BufferType != SECBUFFER_DATA) ; i++);
+      if (i < 4) {		/* found a buffer? */
+				/* yes, set up pointer and counter */
+	stream->iptr = buf[i].pvBuffer;
+	stream->ictr = buf[i].cbBuffer;
+				/* any unprocessed data? */
+	while (++i < 4) if (buf[i].BufferType == SECBUFFER_EXTRA) {
+				/* yes, note for next time around */
+	  stream->iextraptr = buf[i].pvBuffer;
+	  stream->iextractr = buf[i].cbBuffer;
+	}
+      }
+      break;
+    default:			/* anything else means we've lost */
+      return ssl_abort (stream);
+    }
+  }
+  return LONGT;
+}
+
+/* SSL send string as record
+ * Accepts: SSL stream
+ *	    string pointer
+ * Returns: T if success else NIL
+ */
+
+long ssl_soutr (SSLSTREAM *stream,char *string)
+{
+  return ssl_sout (stream,string,(unsigned long) strlen (string));
+}
+
+
+/* SSL send string
+ * Accepts: SSL stream
+ *	    string pointer
+ *	    byte count
+ * Returns: T if success else NIL
+ */
+
+long ssl_sout (SSLSTREAM *stream,char *string,unsigned long size)
+{
+  SecBuffer buf[4];
+  SecBufferDesc msg;
+  char *s;
+  size_t n;
+  if (!stream->tcpstream) return NIL;
+				/* until request satisfied */
+  for (s = stream->ibuf,n = 0; size;) {
+				/* header */
+    buf[0].BufferType = SECBUFFER_STREAM_HEADER;
+    memset (buf[0].pvBuffer = stream->obuf,0,
+	    buf[0].cbBuffer = stream->sizes.cbHeader);
+				/* message (up to maximum size) */
+    buf[1].BufferType = SECBUFFER_DATA;
+    memcpy (buf[1].pvBuffer = stream->obuf + stream->sizes.cbHeader,string,
+	    buf[1].cbBuffer = min (size,SSLBUFLEN));
+				/* trailer */
+    buf[2].BufferType = SECBUFFER_STREAM_TRAILER;
+    memset (buf[2].pvBuffer = ((char *) buf[1].pvBuffer) + buf[1].cbBuffer,0,
+	    buf[2].cbBuffer = stream->sizes.cbTrailer);
+				/* spare */
+    buf[3].BufferType = SECBUFFER_EMPTY;
+    msg.ulVersion = SECBUFFER_VERSION;
+    msg.cBuffers = 4;		/* number of SecBuffers */
+    msg.pBuffers = buf;		/* first SecBuffer */
+    string += buf[1].cbBuffer;
+    size -= buf[1].cbBuffer;	/* this many bytes processed */
+				/* encrypt and send message */
+    if ((((ENCRYPT_MESSAGE_FN) sft->Reserved3)
+	 (&stream->context,0,&msg,NIL) != SEC_E_OK) ||
+	!tcp_sout (stream->tcpstream,stream->obuf,
+		   buf[0].cbBuffer + buf[1].cbBuffer + buf[2].cbBuffer))
+      return ssl_abort (stream);/* encryption or sending failed */
+  }
+  return LONGT;
+}
+
+/* SSL close
+ * Accepts: SSL stream
+ */
+
+void ssl_close (SSLSTREAM *stream)
+{
+  ssl_abort (stream);		/* nuke the stream */
+  fs_give ((void **) &stream);	/* flush the stream */
+}
+
+
+/* SSL abort stream
+ * Accepts: SSL stream
+ * Returns: NIL always
+ */
+
+static long ssl_abort (SSLSTREAM *stream)
+{
+  if (stream->tcpstream) {	/* close TCP stream */
+    sft->DeleteSecurityContext (&stream->context);
+    sft->FreeCredentialHandle (&stream->cred);
+    tcp_close (stream->tcpstream);
+    stream->tcpstream = NIL;
+  }
+  if (stream->ibuf) fs_give ((void **) &stream->ibuf);
+  if (stream->obuf) fs_give ((void **) &stream->obuf);
+  return NIL;
+}
+
+/* SSL get host name
+ * Accepts: SSL stream
+ * Returns: host name for this stream
+ */
+
+char *ssl_host (SSLSTREAM *stream)
+{
+  return stream ? tcp_host (stream->tcpstream) : "UNKNOWN";
+}
+
+
+/* SSL get remote host name
+ * Accepts: SSL stream
+ * Returns: host name for this stream
+ */
+
+char *ssl_remotehost (SSLSTREAM *stream)
+{
+  return tcp_remotehost (stream->tcpstream);
+}
+
+
+/* SSL return port for this stream
+ * Accepts: SSL stream
+ * Returns: port number for this stream
+ */
+
+unsigned long ssl_port (SSLSTREAM *stream)
+{
+  return tcp_port (stream->tcpstream);
+}
+
+
+/* SSL get local host name
+ * Accepts: SSL stream
+ * Returns: local host name
+ */
+
+char *ssl_localhost (SSLSTREAM *stream)
+{
+  return tcp_localhost (stream->tcpstream);
+}
+
+#include "ssl_none.c"		/* currently no server support */