trunk/Src/wptGPGUtil.cpp

/* wptGPGUtil.cpp - GPG helper functions
 *      Copyright (C) 2005 g10 Code GmbH
 *
 * This file is part of WinPT.
 *
 * WinPT is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation; either version 2 of the License, or
 * (at your option) any later version.
 * 
 * WinPT is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with WinPT; if not, write to the Free Software Foundation, 
 * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
 */
#include <windows.h>
#include <sys/stat.h>

#include "gpgme.h"


#define NROFHEXDIGITS 2  
/* Convert two hexadecimal digits from STR to the value they
   represent.  Returns -1 if one of the characters is not a
   hexadecimal digit.  */
static int
hextobyte (const unsigned char *str)
{
    int val = 0;  
    int i;

    for (i = 0; i < NROFHEXDIGITS; i++) {
        if (*str >= '0' && *str <= '9')
            val += *str - '0';
        else if (*str >= 'A' && *str <= 'F')
            val += 10 + *str - 'A';
        else if (*str >= 'a' && *str <= 'f')
            val += 10 + *str - 'a';
        else
            return -1;
        if (i < NROFHEXDIGITS - 1)
            val *= 16;
        str++;
    }
    return val;
}

/* Decode the C formatted string @src and store the result in the
   buffer @destp which is @len bytes long.  If @len is zero, then a
   large enough buffer is allocated with malloc and @destp is set to
   the result.  Currently, @len is only used to specify if allocation
   is desired or not, the caller is expected to make sure that @destp
   is large enough if @len is not zero.  */
gpgme_error_t
gpg_decode_c_string (const char *src, char **destp, size_t len)
{
  char *dest;

  /* Set up the destination buffer.  */
  if (len) {
      if (len < strlen (src) + 1)
          return gpg_error (GPG_ERR_TOO_SHORT);
      dest = *destp;
  }
  else {      
  /* The converted string will never be larger than the original string.  */
      dest = (char*)malloc (strlen (src) + 1);
      if (!dest)
          return gpg_error (GPG_ERR_ENOMEM);
      *destp = dest;
  }

  /* Convert the string.  */
  while (*src) {    
      if (*src != '\\') {
          *(dest++) = *(src++);
          continue;
      }

      switch (src[1]) {
#define DECODE_ONE(match,result)        \
      case match:                       \
          src += 2;                     \
          *(dest++) = result;           \
          break;

          DECODE_ONE ('\'', '\'');
          DECODE_ONE ('\"', '\"');
          DECODE_ONE ('\?', '\?');
          DECODE_ONE ('\\', '\\');
          DECODE_ONE ('a', '\a');
          DECODE_ONE ('b', '\b');
          DECODE_ONE ('f', '\f');
          DECODE_ONE ('n', '\n');
          DECODE_ONE ('r', '\r');
          DECODE_ONE ('t', '\t');
          DECODE_ONE ('v', '\v');

      case 'x': {
            int val = hextobyte ((unsigned char*)&src[2]);
            if (val == -1) { /* Should not happen.  */
                *(dest++) = *(src++);
                *(dest++) = *(src++);
                if (*src)
                  *(dest++) = *(src++);
                if (*src)
                  *(dest++) = *(src++);
            }
            else {
                if (!val) {
                    /* A binary zero is not representable in a C string.  */
                    *(dest++) = '\\';
                    *(dest++) = '0'; 
                }
                else 
                    *((unsigned char *) dest++) = val;
                src += 4;
            }
        }

        default: /* Should not happen.  */
          {
            *(dest++) = *(src++);
            *(dest++) = *(src++);
          }
        } 
  }
  *(dest++) = 0;
  return 0;
}

/* Replace %foo% entries with its real values.
   Return value: expanded path or NULL on error. */
static char *
expand_path (const char *path)
{
    DWORD len;
    char *p;

    len = ExpandEnvironmentStrings (path, NULL, 0);
    if (!len)
        return NULL;
    len += 1;
    p = (char*)calloc (1, len+1);
    if (!p)
        abort ();
    len = ExpandEnvironmentStrings (path, p, len);
    if (!len) {
        free (p);
        return NULL;
    }
    return p; 
}


/* Read a string from the W32 registry. The directory is given
   in @dir and the name of the value in @name, */
static char *
read_w32_registry (HKEY root_key, const char *dir, const char *name)
{
    HKEY key_handle;
    DWORD n1, nbytes;
    DWORD type;
    char *result = NULL;
    
    if (RegOpenKeyEx (root_key, dir, 0, KEY_READ, &key_handle))
        return NULL; /* no need for a RegClose, so return direct */
    
    nbytes = 1;
    if (RegQueryValueEx (key_handle, name, 0, NULL, NULL, &nbytes))
        goto leave;
    result = (char*)calloc (1, (n1=nbytes+1));
    if (!result)
        abort ();
    if (RegQueryValueEx (key_handle, name, 0, &type, (BYTE*)result, &n1)) {
        free (result); 
        result = NULL;
        goto leave;
    }
    if (type == REG_EXPAND_SZ && strchr (result, '%')) {
        char *p = expand_path (result);
        free (result);
        result = p;
    }
    
leave:
    RegCloseKey (key_handle);
    return result;
}


/* Create a temp file based on the name of @name.
   Return value: handle to the file in case of success. */
static HANDLE
create_tmpfile (const char *name)
{    
    HANDLE out;
    SECURITY_ATTRIBUTES sattr;
    char tmp[300]; 

    memset (&sattr, 0, sizeof sattr);
    sattr.bInheritHandle = TRUE;
    sattr.lpSecurityDescriptor = NULL;
    sattr.nLength = sizeof sattr;

    GetTempPath (sizeof (tmp)-1 - strlen (name)-1, tmp);
    strcat (tmp, name);
    out = CreateFile (tmp, GENERIC_READ|GENERIC_WRITE, 
                      FILE_SHARE_WRITE, &sattr,
                      OPEN_ALWAYS, FILE_FLAG_DELETE_ON_CLOSE, NULL);
    return out;
}


/* Create a pipe with a readable remote end and
   write the data from @dat to the local end.
   Return value: read handle on success. */
static HANDLE
create_in_pipe (const char *dat)
{
    HANDLE r, w;
    SECURITY_ATTRIBUTES sec_attr;
    DWORD n;

    memset (&sec_attr, 0, sizeof sec_attr);
    sec_attr.bInheritHandle = TRUE;
    sec_attr.nLength = sizeof sec_attr;

    if (!CreatePipe (&r, &w, &sec_attr, 4096))
        return NULL;

    WriteFile (w, dat, strlen (dat), &n, NULL);
    CloseHandle (w);

    return r;
}


/* Map the contents of the file handle @out to
   a buffer and return it. */
static char*
map_tmpfile (HANDLE out)
{
    DWORD n;
    char *p;

    FlushFileBuffers (out);
    SetFilePointer (out, 0, NULL, FILE_BEGIN);
    n = GetFileSize (out, NULL);
    p = (char*)calloc (1, n+1);
    if (!p)
        abort ();
    ReadFile (out, p, n, &n, NULL);
    p[n] = 0;
    return p;
}


/* Create a process from the command line in @cmd.
   If @out is != NULL, the output of the process will
   be redirected to @out. If @in is != NULL the input
   will be read from @in.
   Return value: 0 on success. */
static int
create_process (const char *cmd, HANDLE in, HANDLE out)
{
    STARTUPINFO si;
    PROCESS_INFORMATION pi;

    memset (&si, 0, sizeof (si));
    si.cb = sizeof si;
    if (in || out)
        si.dwFlags = STARTF_USESTDHANDLES|STARTF_USESHOWWINDOW;
    if (out)
        si.hStdOutput = out;
    if (in)
        si.hStdInput = in;
    si.wShowWindow = SW_HIDE;
    if (!CreateProcess (NULL, (char*)cmd, NULL, NULL, TRUE, 0, 
                        NULL, NULL, &si, &pi))
        return -1;
    WaitForSingleObject (pi.hProcess, INFINITE);
    CloseHandle (pi.hProcess);
    return 0;
}


/* Export a GPG secret key given by @keyid into the file @outfile.
   Return value: 0 on success. */
gpgme_error_t
gpg_export_seckey (const char *keyid, const char *outfile)
{
    gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
    struct stat st;
    char *p;
    char *cmd;

    p = read_w32_registry (HKEY_CURRENT_USER, 
                           "Software\\GNU\\GnuPG", "gpgProgram");
    if (!p)
        return gpg_error (GPG_ERR_INV_ARG);
    cmd = (char*)calloc (1, strlen (p) + strlen (keyid) 
                            + strlen (outfile) + 64 + 2);
    if (!cmd)
        abort ();
    sprintf (cmd, "%s --yes --output \"%s\" --export-secret-key %s", 
             p, outfile, keyid);
    if (create_process (cmd, NULL, NULL))
        err = gpg_error (GPG_ERR_INTERNAL);

    if (stat (outfile, &st) == -1 || st.st_size == 0)
        err = gpg_error (GPG_ERR_NO_DATA);

    free (p);
    free (cmd);
    return err;
}


/* If @export is 1, export the ownertrust data to the
   buffer @data. Otherwise import the ownertrust data from @data.
   Return value: 0 on success. */
gpgme_error_t
gpg_manage_ownertrust (char **data, int export)
{
    gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
    HANDLE out = NULL, in = NULL;
    char *p;
    char *cmd;

    p = read_w32_registry (HKEY_CURRENT_USER, 
                           "Software\\GNU\\GnuPG", "gpgProgram");
    if (!p)
        return gpg_error (GPG_ERR_INV_ARG);

    cmd = (char*)calloc (1, strlen (p) + 64 + 1);
    if (!cmd)
        abort ();  
    sprintf (cmd, "%s %s", p, 
             export? "--export-ownertrust" : "--import-ownertrust");

    if (export)
        out = create_tmpfile ("gpg_ot_out");
    else {
        DWORD nw;
        in = create_tmpfile ("gpg_ot_in");
        WriteFile (in, *data, strlen (*data), &nw, NULL);
        FlushFileBuffers (in);
        /* XXX: need a rewind? */
    }
    if (create_process (cmd, in, out))
        err = gpg_error (GPG_ERR_INTERNAL);

    free (p);
    free (cmd);

    if (in)
        CloseHandle (in);
    if (out) {
        *data = map_tmpfile (out);
        CloseHandle (out);
    }
    return err;
}


/* Call gpg --rebuild-keydb-caches to speed up signature listings. */
gpgme_error_t
gpg_rebuild_cache (char **r_inf)
{
    gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
    HANDLE out = NULL;
    char *p;
    char *cmd;

    p = read_w32_registry (HKEY_CURRENT_USER, 
                           "Software\\GNU\\GnuPG", "gpgProgram");
    if (!p)
        return gpg_error (GPG_ERR_INV_ARG);
    cmd = (char*)calloc (1, strlen (p) + 64);
    if (!cmd)
        abort ();
    sprintf (cmd, "%s --logger-fd=1 --rebuild-keydb-caches", p);

    if (r_inf)
        out = create_tmpfile ("gpg_rebuild_cache");

    if (create_process (cmd, NULL, out))
        err = gpg_error (GPG_ERR_INTERNAL);

    if (r_inf)
        *r_inf = map_tmpfile (out);
    if (out)
        CloseHandle (out);
    free (p);
    free (cmd);
    return 0;
}


/* Call gpg --version to retrieve the 'about' information. */
gpgme_error_t
gpg_get_version (char **r_inf)
{
    gpgme_error_t err= gpg_error (GPG_ERR_NO_ERROR);
    HANDLE out;    
    char *p, *cmd;

    p =read_w32_registry (HKEY_CURRENT_USER, 
                          "Software\\GNU\\GnuPG", "gpgProgram");
    if (!p)
        return gpg_error (GPG_ERR_INV_ARG);
    cmd = (char*)calloc (1, strlen (p) + 32);
    if (!cmd)
        abort ();
    sprintf (cmd, "%s --version", p);

    out = create_tmpfile ("gpg_out");
    if (create_process (cmd, NULL, out))
        err = gpg_error (GPG_ERR_INTERNAL);

    free (p);
    free (cmd);

    *r_inf = map_tmpfile (out);
    CloseHandle (out);    
    return err;
}


/* Return the colon file output of the given file @fname in @r_out.
   Return value: 0 on success. */ 
gpgme_error_t
gpg_import_key_list (const char *fname, char **r_out)
{
    gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
    char *cmd, *p;
    HANDLE out;

    p = read_w32_registry (HKEY_CURRENT_USER, 
                           "Software\\GNU\\GnuPG", "gpgProgram");
    if (!p)
        return gpg_error (GPG_ERR_INV_ARG);

    cmd = (char*)calloc (1, strlen (p) + strlen (fname) + 2+2 + 64);
    if (!cmd)
        abort ();
    sprintf (cmd, "%s --fixed-list-mode --with-colons \"%s\"", p, fname);

    out = create_tmpfile ("gpg_keys");
    if (create_process (cmd, NULL, out))
        err = gpg_error (GPG_ERR_INTERNAL);

    free (p);
    free (cmd);

    *r_out = map_tmpfile (out);
    CloseHandle (out);
    return err;
}

char* 
generate_revoc_input (int code, const char *cmt, const char *pass)
{
    const char *fmt;
    char *p;
    size_t n;

    fmt = "Y\n"     /*  gen_revoke.okay */
          "%d\n"    /* ask_revocation_reason.code */
          "%s\n"    /* ask_revocation_reason.text */
          "%s"      /* text != NULL '\n' otherwise '' */
          "Y\n"     /* ask_revocation_reason.okay */
          "%s\n";   /* passphrase.enter. */
    n = strlen (fmt) + 32;
    if (pass)
        n += strlen (pass) + 1;
    if (cmt)
        n += strlen (cmt) + 1;
    p = (char*)calloc (1, n+1);
    if (!p)
        abort ();
    sprintf (p, fmt, code, cmt? cmt : "", cmt? "\n" : "", pass? pass : "");
    return p;
}
    

/* Generate a revocation certificate for the key with the keyid @keyid.
   @inp_data contains all needed data to answer the questions of the
   command handler. Each separate with a '\n'.
   @r_revcert contains the revocation cert on success.
   Return value: 0 on success. */
gpgme_error_t
gpg_revoke_key (const char *inp_data, const char *keyid, char **r_revcert)
{
    gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
    char *rcrt;
    char *cmd, *p;
    HANDLE in, out;
    
    p = read_w32_registry (HKEY_CURRENT_USER, 
                           "Software\\GNU\\GnuPG", "gpgProgram");
    if (!p)
        return gpg_error (GPG_ERR_INV_ARG);

    cmd = (char*)calloc (1, strlen (p) + strlen (keyid)+1 + 128);
    if (!cmd)
        abort ();
    sprintf (cmd, "%s --pgp7 --command-fd=0 --status-fd=2 --gen-revoke %s", 
             p, keyid);

    in = create_in_pipe (inp_data);
    out = create_tmpfile ("gpg_revcert");
    if (create_process (cmd, in, out)) {
        *r_revcert = NULL;
        err = gpg_error (GPG_ERR_INTERNAL);
    }
    else {
        rcrt = map_tmpfile (out);
        *r_revcert = rcrt;
    }

    free (p);
    free (cmd);

    CloseHandle (in);
    CloseHandle (out);
    return err;
}


/* Return the validity of the user attribute, informerly known 
   as photo-ID. If no uat was found, return 0 for unknown. */
gpgme_error_t
get_uat_validity (const char *keyid, gpgme_validity_t *r_valid)
{
    gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
    HANDLE out;
    char *p, *cmd;
    char *uat;

    *r_valid = GPGME_VALIDITY_UNKNOWN;
    p = read_w32_registry (HKEY_CURRENT_USER, 
                           "Software\\GNU\\GnuPG", "gpgProgram");
    if (!p)
        return gpg_error (GPG_ERR_INV_ARG);

    cmd = (char*)calloc (1, strlen (p) + strlen (keyid)+1 + 128);
    if (!cmd)
        abort ();
    sprintf (cmd, "%s --with-colons --fixed-list-mode --list-keys \"%s\"",
             p, keyid);

    out = create_tmpfile ("gpg_keys");
    if (create_process (cmd, NULL, out))
        err = gpg_error (GPG_ERR_INTERNAL);

    free (p);
    free (cmd);
    
    p = map_tmpfile (out);
    if ((uat = strstr (p, "uat:"))) {
        switch (*(uat+4)) {
        case 'm': *r_valid = GPGME_VALIDITY_MARGINAL; break;
        case 'f':
        case 'u': *r_valid = GPGME_VALIDITY_FULL; break;
        default: *r_valid = GPGME_VALIDITY_UNDEFINED; break;
        }
    }

    free (p);    
    CloseHandle (out);
    return err;
}


#if 0
/* Extract all recipients from the file @file.
   Return value: 0 on success. */
static int
do_get_recipients (const char *file, gpgme_recipient_t *r_list)
{
    gpgme_recipient_t l;
    PACKET *pkt;
    gpg_iobuf_t inp = NULL;
    armor_filter_context_t afx;
    int rc = 0, quit=0;

    if (!file || !r_list) {
        log_debug ("do_list_packets: !r_list || !file");
        return -1;
    }

    *r_list=NULL;
    inp = gpg_iobuf_open (file);
    if (!inp)
        return WPTERR_FILE_OPEN;
    gpg_iobuf_ioctl (inp, 3, 1, NULL); /* disable cache */
    if (gpg_use_armor_filter (inp)) {
        memset (&afx, 0, sizeof (afx));
        gpg_iobuf_push_filter (inp, gpg_armor_filter, &afx);
    }
    pkt = (PACKET *)calloc(1, sizeof *pkt);
    gpg_init_packet (pkt);
    while (!quit && (rc = gpg_parse_packet (inp, pkt)) != -1) {
        switch (pkt->pkttype) {
        case PKT_PUBKEY_ENC:
            {PKT_pubkey_enc *enc = pkt->pkt.pubkey_enc;
            if (!enc)
                break;
            l = calloc (1, sizeof *l);
            l->keyid = calloc (1, 16+1);
            _snprintf (l->keyid, 16, "%08lX%08lX", enc->keyid[0], enc->keyid[1]);
            l->pubkey_algo = enc->pubkey_algo;
            l->status = 0;
            l->next = (*r_list);
            *r_list = l;
            break;}

        case PKT_ENCRYPTED:     
        case PKT_ENCRYPTED_MDC:
        case PKT_COMPRESSED:
        case PKT_PUBLIC_KEY:
        case PKT_SECRET_KEY:
            quit = 1;
            break;
        }
        gpg_free_packet (pkt);
        gpg_init_packet (pkt);
    }
    gpg_iobuf_close (inp);
    safe_free (pkt);
    return 0;
}
#endif
1	twoaday	25	/* wptGPGUtil.cpp - GPG helper functions
2			* Copyright (C) 2005 g10 Code GmbH
3			*
4			* This file is part of WinPT.
5			*
6			* WinPT is free software; you can redistribute it and/or modify
7			* it under the terms of the GNU General Public License as published by
8			* the Free Software Foundation; either version 2 of the License, or
9			* (at your option) any later version.
10			*
11			* WinPT is distributed in the hope that it will be useful,
12			* but WITHOUT ANY WARRANTY; without even the implied warranty of
13			* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14			* GNU General Public License for more details.
15			*
16			* You should have received a copy of the GNU General Public License
17			* along with WinPT; if not, write to the Free Software Foundation,
18			* Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
19			*/
20			#include <windows.h>
21			#include <sys/stat.h>
22
23			#include "gpgme.h"
24
25
26			#define NROFHEXDIGITS 2
27			/* Convert two hexadecimal digits from STR to the value they
28			represent. Returns -1 if one of the characters is not a
29			hexadecimal digit. */
30			static int
31			hextobyte (const unsigned char *str)
32			{
33			int val = 0;
34			int i;
35
36			for (i = 0; i < NROFHEXDIGITS; i++) {
37			if (str >= '0' && str <= '9')
38			val += *str - '0';
39			else if (str >= 'A' && str <= 'F')
40			val += 10 + *str - 'A';
41			else if (str >= 'a' && str <= 'f')
42			val += 10 + *str - 'a';
43			else
44			return -1;
45			if (i < NROFHEXDIGITS - 1)
46			val *= 16;
47			str++;
48			}
49			return val;
50			}
51
52			/* Decode the C formatted string @src and store the result in the
53			buffer @destp which is @len bytes long. If @len is zero, then a
54			large enough buffer is allocated with malloc and @destp is set to
55			the result. Currently, @len is only used to specify if allocation
56			is desired or not, the caller is expected to make sure that @destp
57			is large enough if @len is not zero. */
58			gpgme_error_t
59			gpg_decode_c_string (const char src, char *destp, size_t len)
60			{
61			char *dest;
62
63			/* Set up the destination buffer. */
64			if (len) {
65			if (len < strlen (src) + 1)
66			return gpg_error (GPG_ERR_TOO_SHORT);
67			dest = *destp;
68			}
69			else {
70			/* The converted string will never be larger than the original string. */
71			dest = (char*)malloc (strlen (src) + 1);
72			if (!dest)
73			return gpg_error (GPG_ERR_ENOMEM);
74			*destp = dest;
75			}
76
77			/* Convert the string. */
78			while (*src) {
79			if (*src != '\\') {
80			(dest++) = (src++);
81			continue;
82	twoaday	32	}
83	twoaday	25
84			switch (src[1]) {
85			#define DECODE_ONE(match,result) \
86			case match: \
87			src += 2; \
88			*(dest++) = result; \
89			break;
90
91			DECODE_ONE ('\'', '\'');
92			DECODE_ONE ('\"', '\"');
93			DECODE_ONE ('\?', '\?');
94			DECODE_ONE ('\\', '\\');
95			DECODE_ONE ('a', '\a');
96			DECODE_ONE ('b', '\b');
97			DECODE_ONE ('f', '\f');
98			DECODE_ONE ('n', '\n');
99			DECODE_ONE ('r', '\r');
100			DECODE_ONE ('t', '\t');
101			DECODE_ONE ('v', '\v');
102
103			case 'x': {
104			int val = hextobyte ((unsigned char*)&src[2]);
105	twoaday	32	if (val == -1) { /* Should not happen. */
106	twoaday	25	(dest++) = (src++);
107			(dest++) = (src++);
108			if (*src)
109			(dest++) = (src++);
110			if (*src)
111			(dest++) = (src++);
112			}
113			else {
114	twoaday	32	if (!val) {
115			/* A binary zero is not representable in a C string. */
116	twoaday	25	*(dest++) = '\\';
117			*(dest++) = '0';
118			}
119			else
120			((unsigned char ) dest++) = val;
121			src += 4;
122			}
123			}
124
125	twoaday	32	default: /* Should not happen. */
126	twoaday	25	{
127			(dest++) = (src++);
128			(dest++) = (src++);
129			}
130			}
131			}
132			*(dest++) = 0;
133			return 0;
134			}
135
136			/* Replace %foo% entries with its real values.
137			Return value: expanded path or NULL on error. */
138			static char *
139			expand_path (const char *path)
140			{
141			DWORD len;
142			char *p;
143
144			len = ExpandEnvironmentStrings (path, NULL, 0);
145			if (!len)
146			return NULL;
147			len += 1;
148			p = (char*)calloc (1, len+1);
149			if (!p)
150			abort ();
151			len = ExpandEnvironmentStrings (path, p, len);
152			if (!len) {
153			free (p);
154			return NULL;
155			}
156			return p;
157			}
158
159
160			/* Read a string from the W32 registry. The directory is given
161			in @dir and the name of the value in @name, */
162			static char *
163	twoaday	32	read_w32_registry (HKEY root_key, const char dir, const char name)
164	twoaday	25	{
165			HKEY key_handle;
166			DWORD n1, nbytes;
167			DWORD type;
168			char *result = NULL;
169
170			if (RegOpenKeyEx (root_key, dir, 0, KEY_READ, &key_handle))
171			return NULL; /* no need for a RegClose, so return direct */
172
173			nbytes = 1;
174			if (RegQueryValueEx (key_handle, name, 0, NULL, NULL, &nbytes))
175			goto leave;
176			result = (char*)calloc (1, (n1=nbytes+1));
177			if (!result)
178			abort ();
179			if (RegQueryValueEx (key_handle, name, 0, &type, (BYTE*)result, &n1)) {
180			free (result);
181			result = NULL;
182			goto leave;
183			}
184			if (type == REG_EXPAND_SZ && strchr (result, '%')) {
185			char *p = expand_path (result);
186			free (result);
187			result = p;
188			}
189
190			leave:
191			RegCloseKey (key_handle);
192			return result;
193			}
194
195
196			/* Create a temp file based on the name of @name.
197			Return value: handle to the file in case of success. */
198			static HANDLE
199			create_tmpfile (const char *name)
200			{
201			HANDLE out;
202			SECURITY_ATTRIBUTES sattr;
203			char tmp[300];
204
205			memset (&sattr, 0, sizeof sattr);
206			sattr.bInheritHandle = TRUE;
207			sattr.lpSecurityDescriptor = NULL;
208			sattr.nLength = sizeof sattr;
209
210	twoaday	33	GetTempPath (sizeof (tmp)-1 - strlen (name)-1, tmp);
211	twoaday	25	strcat (tmp, name);
212			out = CreateFile (tmp, GENERIC_READ\|GENERIC_WRITE,
213			FILE_SHARE_WRITE, &sattr,
214			OPEN_ALWAYS, FILE_FLAG_DELETE_ON_CLOSE, NULL);
215			return out;
216			}
217
218
219			/* Create a pipe with a readable remote end and
220			write the data from @dat to the local end.
221			Return value: read handle on success. */
222			static HANDLE
223			create_in_pipe (const char *dat)
224			{
225			HANDLE r, w;
226			SECURITY_ATTRIBUTES sec_attr;
227			DWORD n;
228
229			memset (&sec_attr, 0, sizeof sec_attr);
230			sec_attr.bInheritHandle = TRUE;
231			sec_attr.nLength = sizeof sec_attr;
232
233			if (!CreatePipe (&r, &w, &sec_attr, 4096))
234			return NULL;
235
236			WriteFile (w, dat, strlen (dat), &n, NULL);
237			CloseHandle (w);
238
239			return r;
240			}
241
242
243			/* Map the contents of the file handle @out to
244			a buffer and return it. */
245			static char*
246			map_tmpfile (HANDLE out)
247			{
248			DWORD n;
249			char *p;
250
251			FlushFileBuffers (out);
252			SetFilePointer (out, 0, NULL, FILE_BEGIN);
253			n = GetFileSize (out, NULL);
254			p = (char*)calloc (1, n+1);
255			if (!p)
256			abort ();
257			ReadFile (out, p, n, &n, NULL);
258			p[n] = 0;
259			return p;
260			}
261
262
263			/* Create a process from the command line in @cmd.
264			If @out is != NULL, the output of the process will
265			be redirected to @out. If @in is != NULL the input
266			will be read from @in.
267			Return value: 0 on success. */
268			static int
269			create_process (const char *cmd, HANDLE in, HANDLE out)
270			{
271			STARTUPINFO si;
272			PROCESS_INFORMATION pi;
273
274			memset (&si, 0, sizeof (si));
275			si.cb = sizeof si;
276			if (in \|\| out)
277	twoaday	34	si.dwFlags = STARTF_USESTDHANDLES\|STARTF_USESHOWWINDOW;
278	twoaday	25	if (out)
279			si.hStdOutput = out;
280			if (in)
281			si.hStdInput = in;
282	twoaday	34	si.wShowWindow = SW_HIDE;
283	twoaday	32	if (!CreateProcess (NULL, (char*)cmd, NULL, NULL, TRUE, 0,
284			NULL, NULL, &si, &pi))
285	twoaday	25	return -1;
286			WaitForSingleObject (pi.hProcess, INFINITE);
287			CloseHandle (pi.hProcess);
288			return 0;
289			}
290
291
292			/* Export a GPG secret key given by @keyid into the file @outfile.
293			Return value: 0 on success. */
294			gpgme_error_t
295			gpg_export_seckey (const char keyid, const char outfile)
296			{
297			gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
298			struct stat st;
299			char *p;
300			char *cmd;
301
302	twoaday	32	p = read_w32_registry (HKEY_CURRENT_USER,
303			"Software\\GNU\\GnuPG", "gpgProgram");
304	twoaday	25	if (!p)
305			return gpg_error (GPG_ERR_INV_ARG);
306	twoaday	32	cmd = (char*)calloc (1, strlen (p) + strlen (keyid)
307			+ strlen (outfile) + 64 + 2);
308	twoaday	25	if (!cmd)
309			abort ();
310	twoaday	32	sprintf (cmd, "%s --yes --output \"%s\" --export-secret-key %s",
311			p, outfile, keyid);
312	twoaday	25	if (create_process (cmd, NULL, NULL))
313			err = gpg_error (GPG_ERR_INTERNAL);
314
315			if (stat (outfile, &st) == -1 \|\| st.st_size == 0)
316			err = gpg_error (GPG_ERR_NO_DATA);
317
318			free (p);
319			free (cmd);
320			return err;
321			}
322
323
324			/* If @export is 1, export the ownertrust data to the
325			buffer @data. Otherwise import the ownertrust data from @data.
326			Return value: 0 on success. */
327			gpgme_error_t
328			gpg_manage_ownertrust (char **data, int export)
329			{
330			gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
331			HANDLE out = NULL, in = NULL;
332			char *p;
333			char *cmd;
334
335	twoaday	32	p = read_w32_registry (HKEY_CURRENT_USER,
336			"Software\\GNU\\GnuPG", "gpgProgram");
337	twoaday	25	if (!p)
338			return gpg_error (GPG_ERR_INV_ARG);
339
340			cmd = (char*)calloc (1, strlen (p) + 64 + 1);
341			if (!cmd)
342			abort ();
343	twoaday	32	sprintf (cmd, "%s %s", p,
344			export? "--export-ownertrust" : "--import-ownertrust");
345	twoaday	25
346			if (export)
347			out = create_tmpfile ("gpg_ot_out");
348			else {
349			DWORD nw;
350			in = create_tmpfile ("gpg_ot_in");
351			WriteFile (in, data, strlen (data), &nw, NULL);
352			FlushFileBuffers (in);
353			/* XXX: need a rewind? */
354			}
355			if (create_process (cmd, in, out))
356			err = gpg_error (GPG_ERR_INTERNAL);
357
358			free (p);
359			free (cmd);
360
361			if (in)
362			CloseHandle (in);
363			if (out) {
364			*data = map_tmpfile (out);
365			CloseHandle (out);
366			}
367			return err;
368			}
369
370	twoaday	32
371	twoaday	25	/* Call gpg --rebuild-keydb-caches to speed up signature listings. */
372			gpgme_error_t
373			gpg_rebuild_cache (char **r_inf)
374			{
375			gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
376			HANDLE out = NULL;
377			char *p;
378			char *cmd;
379
380	twoaday	32	p = read_w32_registry (HKEY_CURRENT_USER,
381			"Software\\GNU\\GnuPG", "gpgProgram");
382	twoaday	25	if (!p)
383			return gpg_error (GPG_ERR_INV_ARG);
384			cmd = (char*)calloc (1, strlen (p) + 64);
385			if (!cmd)
386			abort ();
387			sprintf (cmd, "%s --logger-fd=1 --rebuild-keydb-caches", p);
388
389			if (r_inf)
390			out = create_tmpfile ("gpg_rebuild_cache");
391
392			if (create_process (cmd, NULL, out))
393			err = gpg_error (GPG_ERR_INTERNAL);
394
395			if (r_inf)
396			*r_inf = map_tmpfile (out);
397			if (out)
398			CloseHandle (out);
399			free (p);
400			free (cmd);
401			return 0;
402			}
403
404	twoaday	32
405	twoaday	25	/* Call gpg --version to retrieve the 'about' information. */
406			gpgme_error_t
407			gpg_get_version (char **r_inf)
408			{
409			gpgme_error_t err= gpg_error (GPG_ERR_NO_ERROR);
410			HANDLE out;
411			char p, cmd;
412
413	twoaday	32	p =read_w32_registry (HKEY_CURRENT_USER,
414			"Software\\GNU\\GnuPG", "gpgProgram");
415	twoaday	25	if (!p)
416			return gpg_error (GPG_ERR_INV_ARG);
417			cmd = (char*)calloc (1, strlen (p) + 32);
418			if (!cmd)
419			abort ();
420			sprintf (cmd, "%s --version", p);
421
422			out = create_tmpfile ("gpg_out");
423			if (create_process (cmd, NULL, out))
424			err = gpg_error (GPG_ERR_INTERNAL);
425
426			free (p);
427			free (cmd);
428
429			*r_inf = map_tmpfile (out);
430			CloseHandle (out);
431			return err;
432			}
433
434	twoaday	32
435	twoaday	25	/* Return the colon file output of the given file @fname in @r_out.
436			Return value: 0 on success. */
437			gpgme_error_t
438			gpg_import_key_list (const char fname, char *r_out)
439			{
440			gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
441			char cmd, p;
442			HANDLE out;
443
444	twoaday	32	p = read_w32_registry (HKEY_CURRENT_USER,
445			"Software\\GNU\\GnuPG", "gpgProgram");
446	twoaday	25	if (!p)
447			return gpg_error (GPG_ERR_INV_ARG);
448
449			cmd = (char*)calloc (1, strlen (p) + strlen (fname) + 2+2 + 64);
450			if (!cmd)
451			abort ();
452			sprintf (cmd, "%s --fixed-list-mode --with-colons \"%s\"", p, fname);
453
454			out = create_tmpfile ("gpg_keys");
455			if (create_process (cmd, NULL, out))
456			err = gpg_error (GPG_ERR_INTERNAL);
457
458			free (p);
459			free (cmd);
460
461			*r_out = map_tmpfile (out);
462			CloseHandle (out);
463			return err;
464			}
465
466			char*
467			generate_revoc_input (int code, const char cmt, const char pass)
468			{
469			const char *fmt;
470			char *p;
471			size_t n;
472
473			fmt = "Y\n" /* gen_revoke.okay */
474			"%d\n" /* ask_revocation_reason.code */
475			"%s\n" /* ask_revocation_reason.text */
476			"%s" /* text != NULL '\n' otherwise '' */
477			"Y\n" /* ask_revocation_reason.okay */
478			"%s\n"; /* passphrase.enter. */
479			n = strlen (fmt) + 32;
480			if (pass)
481			n += strlen (pass) + 1;
482			if (cmt)
483			n += strlen (cmt) + 1;
484			p = (char*)calloc (1, n+1);
485			if (!p)
486			abort ();
487			sprintf (p, fmt, code, cmt? cmt : "", cmt? "\n" : "", pass? pass : "");
488			return p;
489			}
490
491
492			/* Generate a revocation certificate for the key with the keyid @keyid.
493			@inp_data contains all needed data to answer the questions of the
494			command handler. Each separate with a '\n'.
495			@r_revcert contains the revocation cert on success.
496			Return value: 0 on success. */
497			gpgme_error_t
498			gpg_revoke_key (const char inp_data, const char keyid, char **r_revcert)
499			{
500			gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
501			char *rcrt;
502			char cmd, p;
503			HANDLE in, out;
504
505	twoaday	32	p = read_w32_registry (HKEY_CURRENT_USER,
506			"Software\\GNU\\GnuPG", "gpgProgram");
507	twoaday	25	if (!p)
508			return gpg_error (GPG_ERR_INV_ARG);
509
510	twoaday	33	cmd = (char*)calloc (1, strlen (p) + strlen (keyid)+1 + 128);
511	twoaday	25	if (!cmd)
512			abort ();
513	twoaday	32	sprintf (cmd, "%s --pgp7 --command-fd=0 --status-fd=2 --gen-revoke %s",
514			p, keyid);
515	twoaday	25
516			in = create_in_pipe (inp_data);
517			out = create_tmpfile ("gpg_revcert");
518			if (create_process (cmd, in, out)) {
519			*r_revcert = NULL;
520			err = gpg_error (GPG_ERR_INTERNAL);
521			}
522			else {
523			rcrt = map_tmpfile (out);
524			*r_revcert = rcrt;
525			}
526
527			free (p);
528			free (cmd);
529
530			CloseHandle (in);
531			CloseHandle (out);
532			return err;
533			}
534	twoaday	33
535
536			/* Return the validity of the user attribute, informerly known
537			as photo-ID. If no uat was found, return 0 for unknown. */
538			gpgme_error_t
539			get_uat_validity (const char keyid, gpgme_validity_t r_valid)
540			{
541			gpgme_error_t err = gpg_error (GPG_ERR_NO_ERROR);
542			HANDLE out;
543			char p, cmd;
544			char *uat;
545
546			*r_valid = GPGME_VALIDITY_UNKNOWN;
547			p = read_w32_registry (HKEY_CURRENT_USER,
548			"Software\\GNU\\GnuPG", "gpgProgram");
549			if (!p)
550			return gpg_error (GPG_ERR_INV_ARG);
551
552			cmd = (char*)calloc (1, strlen (p) + strlen (keyid)+1 + 128);
553			if (!cmd)
554			abort ();
555			sprintf (cmd, "%s --with-colons --fixed-list-mode --list-keys \"%s\"",
556			p, keyid);
557
558			out = create_tmpfile ("gpg_keys");
559			if (create_process (cmd, NULL, out))
560			err = gpg_error (GPG_ERR_INTERNAL);
561
562			free (p);
563			free (cmd);
564
565			p = map_tmpfile (out);
566			if ((uat = strstr (p, "uat:"))) {
567			switch (*(uat+4)) {
568			case 'm': *r_valid = GPGME_VALIDITY_MARGINAL; break;
569			case 'f':
570			case 'u': *r_valid = GPGME_VALIDITY_FULL; break;
571			default: *r_valid = GPGME_VALIDITY_UNDEFINED; break;
572			}
573			}
574
575			free (p);
576			CloseHandle (out);
577			return err;
578			}
579
580
581			#if 0
582			/* Extract all recipients from the file @file.
583			Return value: 0 on success. */
584			static int
585			do_get_recipients (const char file, gpgme_recipient_t r_list)
586			{
587			gpgme_recipient_t l;
588			PACKET *pkt;
589			gpg_iobuf_t inp = NULL;
590			armor_filter_context_t afx;
591			int rc = 0, quit=0;
592
593			if (!file \|\| !r_list) {
594			log_debug ("do_list_packets: !r_list \|\| !file");
595			return -1;
596			}
597
598			*r_list=NULL;
599			inp = gpg_iobuf_open (file);
600			if (!inp)
601			return WPTERR_FILE_OPEN;
602			gpg_iobuf_ioctl (inp, 3, 1, NULL); /* disable cache */
603			if (gpg_use_armor_filter (inp)) {
604			memset (&afx, 0, sizeof (afx));
605			gpg_iobuf_push_filter (inp, gpg_armor_filter, &afx);
606			}
607			pkt = (PACKET )calloc(1, sizeof pkt);
608			gpg_init_packet (pkt);
609			while (!quit && (rc = gpg_parse_packet (inp, pkt)) != -1) {
610			switch (pkt->pkttype) {
611			case PKT_PUBKEY_ENC:
612			{PKT_pubkey_enc *enc = pkt->pkt.pubkey_enc;
613			if (!enc)
614			break;
615			l = calloc (1, sizeof *l);
616			l->keyid = calloc (1, 16+1);
617			_snprintf (l->keyid, 16, "%08lX%08lX", enc->keyid[0], enc->keyid[1]);
618			l->pubkey_algo = enc->pubkey_algo;
619			l->status = 0;
620			l->next = (*r_list);
621			*r_list = l;
622			break;}
623
624			case PKT_ENCRYPTED:
625			case PKT_ENCRYPTED_MDC:
626			case PKT_COMPRESSED:
627			case PKT_PUBLIC_KEY:
628			case PKT_SECRET_KEY:
629			quit = 1;
630			break;
631			}
632			gpg_free_packet (pkt);
633			gpg_init_packet (pkt);
634			}
635			gpg_iobuf_close (inp);
636			safe_free (pkt);
637			return 0;
638			}
639			#endif