/*
* winstore.c: Windows-specific implementation of the interface
* defined in storage.h.
*/
#include <windows.h>
#include <stdio.h>
#include <stdlib.h>
#include "putty.h"
#include "storage.h"
static const char *const puttystr = PUTTY_REG_POS "\\Sessions";
static char seedpath[2*MAX_PATH+10] = "\0";
static char hex[16] = "0123456789ABCDEF";
static void mungestr(char *in, char *out) {
int candot = 0;
while (*in) {
if (*in == ' ' || *in == '\\' || *in == '*' || *in == '?' ||
*in == '%' || *in < ' ' || *in > '~' || (*in == '.' && !candot)) {
*out++ = '%';
*out++ = hex[((unsigned char)*in) >> 4];
*out++ = hex[((unsigned char)*in) & 15];
} else
*out++ = *in;
in++;
candot = 1;
}
*out = '\0';
return;
}
static void unmungestr(char *in, char *out, int outlen) {
while (*in) {
if (*in == '%' && in[1] && in[2]) {
int i, j;
i = in[1] - '0'; i -= (i > 9 ? 7 : 0);
j = in[2] - '0'; j -= (j > 9 ? 7 : 0);
*out++ = (i<<4) + j;
if (!--outlen) return;
in += 3;
} else {
*out++ = *in++;
if (!--outlen) return;
}
}
*out = '\0';
return;
}
void *open_settings_w(char *sessionname) {
HKEY subkey1, sesskey;
int ret;
char *p;
p = smalloc(3*strlen(sessionname)+1);
mungestr(sessionname, p);
ret = RegCreateKey(HKEY_CURRENT_USER, puttystr, &subkey1);
if (ret != ERROR_SUCCESS) {
sfree(p);
return NULL;
}
ret = RegCreateKey(subkey1, p, &sesskey);
sfree(p);
RegCloseKey(subkey1);
if (ret != ERROR_SUCCESS)
return NULL;
return (void *)sesskey;
}
void write_setting_s(void *handle, char *key, char *value) {
if (handle)
RegSetValueEx((HKEY)handle, key, 0, REG_SZ, value, 1+strlen(value));
}
void write_setting_i(void *handle, char *key, int value) {
if (handle)
RegSetValueEx((HKEY)handle, key, 0, REG_DWORD,
(CONST BYTE *)&value, sizeof(value));
}
void close_settings_w(void *handle) {
RegCloseKey((HKEY)handle);
}
void *open_settings_r(char *sessionname) {
HKEY subkey1, sesskey;
char *p;
p = smalloc(3*strlen(sessionname)+1);
mungestr(sessionname, p);
if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS) {
sesskey = NULL;
} else {
if (RegOpenKey(subkey1, p, &sesskey) != ERROR_SUCCESS) {
sesskey = NULL;
}
RegCloseKey(subkey1);
}
sfree(p);
return (void *)sesskey;
}
char *read_setting_s(void *handle, char *key, char *buffer, int buflen) {
DWORD type, size;
size = buflen;
if (!handle ||
RegQueryValueEx((HKEY)handle, key, 0,
&type, buffer, &size) != ERROR_SUCCESS ||
type != REG_SZ)
return NULL;
else
return buffer;
}
int read_setting_i(void *handle, char *key, int defvalue) {
DWORD type, val, size;
size = sizeof(val);
if (!handle ||
RegQueryValueEx((HKEY)handle, key, 0, &type,
(BYTE *)&val, &size) != ERROR_SUCCESS ||
size != sizeof(val) || type != REG_DWORD)
return defvalue;
else
return val;
}
void close_settings_r(void *handle) {
RegCloseKey((HKEY)handle);
}
void del_settings (char *sessionname) {
HKEY subkey1;
char *p;
if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS)
return;
p = smalloc(3*strlen(sessionname)+1);
mungestr(sessionname, p);
RegDeleteKey(subkey1, p);
sfree(p);
RegCloseKey(subkey1);
}
struct enumsettings {
HKEY key;
int i;
};
void *enum_settings_start(void) {
struct enumsettings *ret;
HKEY key;
if (RegCreateKey(HKEY_CURRENT_USER, puttystr, &key) != ERROR_SUCCESS)
return NULL;
ret = smalloc(sizeof(*ret));
if (ret) {
ret->key = key;
ret->i = 0;
}
return ret;
}
char *enum_settings_next(void *handle, char *buffer, int buflen) {
struct enumsettings *e = (struct enumsettings *)handle;
char *otherbuf;
otherbuf = smalloc(3*buflen);
if (otherbuf && RegEnumKey(e->key, e->i++, otherbuf,
3*buflen) == ERROR_SUCCESS) {
unmungestr(otherbuf, buffer, buflen);
sfree(otherbuf);
return buffer;
} else
return NULL;
}
void enum_settings_finish(void *handle) {
struct enumsettings *e = (struct enumsettings *)handle;
RegCloseKey(e->key);
sfree(e);
}
static void hostkey_regname(char *buffer, char *hostname,
int port, char *keytype) {
int len;
strcpy(buffer, keytype);
strcat(buffer, "@");
len = strlen(buffer);
len += sprintf(buffer+len, "%d:", port);
mungestr(hostname, buffer + strlen(buffer));
}
int verify_host_key(char *hostname, int port, char *keytype, char *key) {
char *otherstr, *regname;
int len;
HKEY rkey;
DWORD readlen;
DWORD type;
int ret, compare;
len = 1 + strlen(key);
/*
* Now read a saved key in from the registry and see what it
* says.
*/
otherstr = smalloc(len);
regname = smalloc(3*(strlen(hostname)+strlen(keytype))+15);
hostkey_regname(regname, hostname, port, keytype);
if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
&rkey) != ERROR_SUCCESS)
return 1; /* key does not exist in registry */
readlen = len;
ret = RegQueryValueEx(rkey, regname, NULL, &type, otherstr, &readlen);
if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA &&
!strcmp(keytype, "rsa")) {
/*
* Key didn't exist. If the key type is RSA, we'll try
* another trick, which is to look up the _old_ key format
* under just the hostname and translate that.
*/
char *justhost = regname + 1 + strcspn(regname, ":");
char *oldstyle = smalloc(len + 10); /* safety margin */
readlen = len;
ret = RegQueryValueEx(rkey, justhost, NULL, &type,
oldstyle, &readlen);
if (ret == ERROR_SUCCESS && type == REG_SZ) {
/*
* The old format is two old-style bignums separated by
* a slash. An old-style bignum is made of groups of
* four hex digits: digits are ordered in sensible
* (most to least significant) order within each group,
* but groups are ordered in silly (least to most)
* order within the bignum. The new format is two
* ordinary C-format hex numbers (0xABCDEFG...XYZ, with
* A nonzero except in the special case 0x0, which
* doesn't appear anyway in RSA keys) separated by a
* comma. All hex digits are lowercase in both formats.
*/
char *p = otherstr;
char *q = oldstyle;
int i, j;
for (i = 0; i < 2; i++) {
int ndigits, nwords;
*p++ = '0'; *p++ = 'x';
ndigits = strcspn(q, "/"); /* find / or end of string */
nwords = ndigits / 4;
/* now trim ndigits to remove leading zeros */
while (q[ (ndigits-1) ^ 3 ] == '0' && ndigits > 1)
ndigits--;
/* now move digits over to new string */
for (j = 0; j < ndigits; j++)
p[ndigits-1-j] = q[j^3];
p += ndigits;
q += nwords*4;
if (*q) {
q++; /* eat the slash */
*p++ = ','; /* add a comma */
}
*p = '\0'; /* terminate the string */
}
/*
* Now _if_ this key matches, we'll enter it in the new
* format. If not, we'll assume something odd went
* wrong, and hyper-cautiously do nothing.
*/
if (!strcmp(otherstr, key))
RegSetValueEx(rkey, regname, 0, REG_SZ, otherstr,
strlen(otherstr)+1);
}
}
RegCloseKey(rkey);
compare = strcmp(otherstr, key);
sfree(otherstr);
sfree(regname);
if (ret == ERROR_MORE_DATA ||
(ret == ERROR_SUCCESS && type == REG_SZ && compare))
return 2; /* key is different in registry */
else if (ret != ERROR_SUCCESS || type != REG_SZ)
return 1; /* key does not exist in registry */
else
return 0; /* key matched OK in registry */
}
void store_host_key(char *hostname, int port, char *keytype, char *key) {
char *regname;
HKEY rkey;
regname = smalloc(3*(strlen(hostname)+strlen(keytype))+15);
hostkey_regname(regname, hostname, port, keytype);
if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
&rkey) != ERROR_SUCCESS)
return; /* key does not exist in registry */
RegSetValueEx(rkey, regname, 0, REG_SZ, key,
strlen(key)+1);
RegCloseKey(rkey);
}
/*
* Find the random seed file path and store it in `seedpath'.
*/
static void get_seedpath(void) {
HKEY rkey;
DWORD type, size;
size = sizeof(seedpath);
if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey)==ERROR_SUCCESS) {
int ret = RegQueryValueEx(rkey, "RandSeedFile",
0, &type, seedpath, &size);
if (ret != ERROR_SUCCESS || type != REG_SZ)
seedpath[0] = '\0';
RegCloseKey(rkey);
} else
seedpath[0] = '\0';
if (!seedpath[0]) {
int len, ret;
len = GetEnvironmentVariable("HOMEDRIVE", seedpath, sizeof(seedpath));
ret = GetEnvironmentVariable("HOMEPATH", seedpath+len,
sizeof(seedpath)-len);
if (ret == 0) { /* probably win95; store in \WINDOWS */
GetWindowsDirectory(seedpath, sizeof(seedpath));
len = strlen(seedpath);
} else
len += ret;
strcpy(seedpath+len, "\\PUTTY.RND");
}
}
void read_random_seed(noise_consumer_t consumer) {
HANDLE seedf;
if (!seedpath[0])
get_seedpath();
seedf = CreateFile(seedpath, GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE,
NULL, OPEN_EXISTING, 0, NULL);
if (seedf != INVALID_HANDLE_VALUE) {
while (1) {
char buf[1024];
DWORD len;
if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
consumer(buf, len);
else
break;
}
CloseHandle(seedf);
}
}
void write_random_seed(void *data, int len) {
HANDLE seedf;
if (!seedpath[0])
get_seedpath();
seedf = CreateFile(seedpath, GENERIC_WRITE, 0,
NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
if (seedf != INVALID_HANDLE_VALUE) {
DWORD lenwritten;
WriteFile(seedf, data, len, &lenwritten, NULL);
CloseHandle(seedf);
}
}
/*
* Recursively delete a registry key and everything under it.
*/
static void registry_recursive_remove(HKEY key) {
DWORD i;
char name[MAX_PATH+1];
HKEY subkey;
i = 0;
while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
registry_recursive_remove(subkey);
RegCloseKey(subkey);
}
RegDeleteKey(key, name);
}
}
void cleanup_all(void) {
HKEY key;
int ret;
char name[MAX_PATH+1];
/* ------------------------------------------------------------
* Wipe out the random seed file.
*/
if (!seedpath[0])
get_seedpath();
remove(seedpath);
/* ------------------------------------------------------------
* Destroy all registry information associated with PuTTY.
*/
/*
* Open the main PuTTY registry key and remove everything in it.
*/
if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) == ERROR_SUCCESS) {
registry_recursive_remove(key);
RegCloseKey(key);
}
/*
* Now open the parent key and remove the PuTTY main key. Once
* we've done that, see if the parent key has any other
* children.
*/
if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
&key) == ERROR_SUCCESS) {
RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
ret = RegEnumKey(key, 0, name, sizeof(name));
RegCloseKey(key);
/*
* If the parent key had no other children, we must delete
* it in its turn. That means opening the _grandparent_
* key.
*/
if (ret != ERROR_SUCCESS) {
if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
&key) == ERROR_SUCCESS) {
RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
RegCloseKey(key);
}
}
}
/*
* Now we're done.
*/
}