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synced 2025-07-16 10:37:38 -05:00
Rationalised host key storage. Also started code reorg: persistent-state
routines have been moved out into a replaceable module winstore.c. [originally from svn r639]
This commit is contained in:
Simon Tatham
330
winstore.c
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330
winstore.c
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@ -0,0 +1,330 @@
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/*
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* winstore.c: Windows-specific implementation of the interface
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* defined in storage.h.
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*/
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#include <windows.h>
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#include <stdio.h>
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#include "putty.h"
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#include "storage.h"
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static char seedpath[2*MAX_PATH+10] = "\0";
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static char hex[16] = "0123456789ABCDEF";
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static void mungestr(char *in, char *out) {
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int candot = 0;
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while (*in) {
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if (*in == ' ' || *in == '\\' || *in == '*' || *in == '?' ||
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*in == '%' || *in < ' ' || *in > '~' || (*in == '.' && !candot)) {
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*out++ = '%';
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*out++ = hex[((unsigned char)*in) >> 4];
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*out++ = hex[((unsigned char)*in) & 15];
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} else
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*out++ = *in;
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in++;
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candot = 1;
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}
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*out = '\0';
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return;
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}
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static void unmungestr(char *in, char *out) {
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while (*in) {
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if (*in == '%' && in[1] && in[2]) {
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int i, j;
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i = in[1] - '0'; i -= (i > 9 ? 7 : 0);
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j = in[2] - '0'; j -= (j > 9 ? 7 : 0);
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*out++ = (i<<4) + j;
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in += 3;
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} else
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*out++ = *in++;
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}
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*out = '\0';
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return;
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}
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void *open_settings_w(char *sessionname);
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void write_setting_s(void *handle, char *key, char *value);
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void write_setting_i(void *handle, char *key, int value);
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void *close_settings_w(void *handle);
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void *open_settings_r(char *sessionname);
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char *read_setting_s(void *handle, char *key, char *buffer, int buflen);
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int read_setting_i(void *handle, char *key, int defvalue);
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void *close_settings_r(void *handle);
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static void hostkey_regname(char *buffer, char *hostname, char *keytype) {
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strcpy(buffer, keytype);
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strcat(buffer, "@");
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mungestr(hostname, buffer + strlen(buffer));
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}
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int verify_host_key(char *hostname, char *keytype, char *key) {
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char *otherstr, *regname;
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int len;
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HKEY rkey;
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DWORD readlen;
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DWORD type;
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int ret, compare;
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len = 1 + strlen(key);
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/*
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* Now read a saved key in from the registry and see what it
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* says.
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*/
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otherstr = smalloc(len);
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regname = smalloc(3*(strlen(hostname)+strlen(keytype))+5);
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if (!otherstr || !regname)
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fatalbox("Out of memory");
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hostkey_regname(regname, hostname, keytype);
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if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
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&rkey) != ERROR_SUCCESS)
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return 1; /* key does not exist in registry */
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readlen = len;
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ret = RegQueryValueEx(rkey, regname, NULL, &type, otherstr, &readlen);
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if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA &&
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!strcmp(keytype, "rsa")) {
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/*
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* Key didn't exist. If the key type is RSA, we'll try
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* another trick, which is to look up the _old_ key format
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* under just the hostname and translate that.
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*/
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char *justhost = regname + 1 + strlen(keytype);
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char *oldstyle = smalloc(len + 10); /* safety margin */
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readlen = len;
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ret = RegQueryValueEx(rkey, justhost, NULL, &type,
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oldstyle, &readlen);
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if (ret == ERROR_SUCCESS && type == REG_SZ) {
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/*
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* The old format is two old-style bignums separated by
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* a slash. An old-style bignum is made of groups of
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* four hex digits: digits are ordered in sensible
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* (most to least significant) order within each group,
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* but groups are ordered in silly (least to most)
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* order within the bignum. The new format is two
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* ordinary C-format hex numbers (0xABCDEFG...XYZ, with
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* A nonzero except in the special case 0x0, which
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* doesn't appear anyway in RSA keys) separated by a
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* comma. All hex digits are lowercase in both formats.
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*/
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char *p = otherstr;
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char *q = oldstyle;
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int i, j;
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for (i = 0; i < 2; i++) {
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int ndigits, nwords;
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*p++ = '0'; *p++ = 'x';
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ndigits = strcspn(q, "/"); /* find / or end of string */
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nwords = ndigits / 4;
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/* now trim ndigits to remove leading zeros */
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while (q[ (ndigits-1) ^ 3 ] == '0' && ndigits > 1)
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ndigits--;
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/* now move digits over to new string */
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for (j = 0; j < ndigits; j++)
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p[ndigits-1-j] = q[j^3];
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p += ndigits;
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q += nwords*4;
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if (*q) {
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q++; /* eat the slash */
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*p++ = ','; /* add a comma */
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}
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*p = '\0'; /* terminate the string */
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}
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/*
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* Now _if_ this key matches, we'll enter it in the new
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* format. If not, we'll assume something odd went
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* wrong, and hyper-cautiously do nothing.
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*/
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if (!strcmp(otherstr, key))
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RegSetValueEx(rkey, regname, 0, REG_SZ, otherstr,
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strlen(otherstr)+1);
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}
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}
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RegCloseKey(rkey);
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compare = strcmp(otherstr, key);
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sfree(otherstr);
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sfree(regname);
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if (ret == ERROR_MORE_DATA ||
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(ret == ERROR_SUCCESS && type == REG_SZ && compare))
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return 2; /* key is different in registry */
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else if (ret != ERROR_SUCCESS || type != REG_SZ)
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return 1; /* key does not exist in registry */
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else
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return 0; /* key matched OK in registry */
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}
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void store_host_key(char *hostname, char *keytype, char *key) {
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char *regname;
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HKEY rkey;
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regname = smalloc(3*(strlen(hostname)+strlen(keytype))+5);
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if (!regname)
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fatalbox("Out of memory");
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hostkey_regname(regname, hostname, keytype);
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if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
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&rkey) != ERROR_SUCCESS)
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return; /* key does not exist in registry */
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RegSetValueEx(rkey, regname, 0, REG_SZ, key,
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strlen(key)+1);
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RegCloseKey(rkey);
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}
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/*
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* Find the random seed file path and store it in `seedpath'.
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*/
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static void get_seedpath(void) {
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HKEY rkey;
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DWORD type, size;
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size = sizeof(seedpath);
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if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey)==ERROR_SUCCESS) {
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int ret = RegQueryValueEx(rkey, "RandSeedFile",
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0, &type, seedpath, &size);
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if (ret != ERROR_SUCCESS || type != REG_SZ)
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seedpath[0] = '\0';
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RegCloseKey(rkey);
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} else
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seedpath[0] = '\0';
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if (!seedpath[0]) {
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int len, ret;
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len = GetEnvironmentVariable("HOMEDRIVE", seedpath, sizeof(seedpath));
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ret = GetEnvironmentVariable("HOMEPATH", seedpath+len,
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sizeof(seedpath)-len);
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if (ret == 0) { /* probably win95; store in \WINDOWS */
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GetWindowsDirectory(seedpath, sizeof(seedpath));
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len = strlen(seedpath);
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} else
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len += ret;
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strcpy(seedpath+len, "\\PUTTY.RND");
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}
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}
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void read_random_seed(noise_consumer_t consumer) {
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HANDLE seedf;
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if (!seedpath[0])
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get_seedpath();
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seedf = CreateFile(seedpath, GENERIC_READ,
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FILE_SHARE_READ | FILE_SHARE_WRITE,
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NULL, OPEN_EXISTING, 0, NULL);
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if (seedf != INVALID_HANDLE_VALUE) {
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while (1) {
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char buf[1024];
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DWORD len;
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if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
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consumer(buf, len);
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else
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break;
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}
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CloseHandle(seedf);
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}
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}
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void write_random_seed(void *data, size_t len) {
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HANDLE seedf;
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if (!seedpath[0])
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get_seedpath();
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seedf = CreateFile(seedpath, GENERIC_WRITE, 0,
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NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
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if (seedf != INVALID_HANDLE_VALUE) {
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DWORD lenwritten;
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WriteFile(seedf, data, len, &lenwritten, NULL);
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CloseHandle(seedf);
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}
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}
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/*
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* Recursively delete a registry key and everything under it.
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*/
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static void registry_recursive_remove(HKEY key) {
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DWORD i;
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char name[MAX_PATH+1];
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HKEY subkey;
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i = 0;
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while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
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if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
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registry_recursive_remove(subkey);
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RegCloseKey(subkey);
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}
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RegDeleteKey(key, name);
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}
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}
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void cleanup_all(void) {
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HKEY key;
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int ret;
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char name[MAX_PATH+1];
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/* ------------------------------------------------------------
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* Wipe out the random seed file.
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*/
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if (!seedpath[0])
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get_seedpath();
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remove(seedpath);
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/* ------------------------------------------------------------
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* Destroy all registry information associated with PuTTY.
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*/
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/*
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* Open the main PuTTY registry key and remove everything in it.
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*/
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if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) == ERROR_SUCCESS) {
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registry_recursive_remove(key);
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RegCloseKey(key);
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}
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/*
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* Now open the parent key and remove the PuTTY main key. Once
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* we've done that, see if the parent key has any other
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* children.
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*/
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if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
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&key) == ERROR_SUCCESS) {
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RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
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ret = RegEnumKey(key, 0, name, sizeof(name));
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RegCloseKey(key);
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/*
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* If the parent key had no other children, we must delete
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* it in its turn. That means opening the _grandparent_
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* key.
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*/
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if (ret != ERROR_SUCCESS) {
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if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
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&key) == ERROR_SUCCESS) {
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RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
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RegCloseKey(key);
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}
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}
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}
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/*
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* Now we're done.
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*/
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}
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