[sgt/putty] / winstore.c

/*
 * winstore.c: Windows-specific implementation of the interface
 * defined in storage.h.
 */

#include <windows.h>
#include <stdio.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 = malloc(3*strlen(sessionname)+1);
    mungestr(sessionname, p);
    
    ret = RegCreateKey(HKEY_CURRENT_USER, puttystr, &subkey1);
    if (ret != ERROR_SUCCESS) {
        free(p);
        return NULL;
    }
    ret = RegCreateKey(subkey1, p, &sesskey);
    free(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 = malloc(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);
    }

    free(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 = malloc(3*strlen(sessionname)+1);
    mungestr(sessionname, p);
    RegDeleteKey(subkey1, p);
    free(p);

    RegCloseKey(subkey1);
}

static void hostkey_regname(char *buffer, char *hostname, char *keytype) {
    strcpy(buffer, keytype);
    strcat(buffer, "@");
    mungestr(hostname, buffer + strlen(buffer));
}

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 = malloc(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 = malloc(3*buflen);
    if (otherbuf && RegEnumKey(e->key, e->i++, otherbuf,
                               3*buflen) == ERROR_SUCCESS) {
        unmungestr(otherbuf, buffer, buflen);
        free(otherbuf);
        return buffer;
    } else
        return NULL;

}

void enum_settings_finish(void *handle) {
    struct enumsettings *e = (struct enumsettings *)handle;
    RegCloseKey(e->key);
    free(e);
}

int verify_host_key(char *hostname, 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))+5);
    if (!otherstr || !regname)
	fatalbox("Out of memory");

    hostkey_regname(regname, hostname, 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 + strlen(keytype);
        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, char *keytype, char *key) {
    char *regname;
    HKEY rkey;

    regname = smalloc(3*(strlen(hostname)+strlen(keytype))+5);
    if (!regname)
	fatalbox("Out of memory");

    hostkey_regname(regname, hostname, 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.
     */
}
Commit	Line	Data
d5859615	1	/*
	2	* winstore.c: Windows-specific implementation of the interface
	3	* defined in storage.h.
	4	*/
	5
	6	#include <windows.h>
	7	#include <stdio.h>
	8	#include "putty.h"
	9	#include "storage.h"
	10
d1622aed	11	static const char *const puttystr = PUTTY_REG_POS "\\Sessions";
d1622aed	12
d5859615	13	static char seedpath[2*MAX_PATH+10] = "\0";
	14
	15	static char hex[16] = "0123456789ABCDEF";
	16
	17	static void mungestr(char in, char out) {
	18	int candot = 0;
	19
	20	while (*in) {
	21	if (in == ' ' \|\| in == '\\' \|\| in == '' \|\| *in == '?' \|\|
	22	in == '%' \|\| in < ' ' \|\| in > '~' \|\| (in == '.' && !candot)) {
	23	*out++ = '%';
	24	out++ = hex[((unsigned char)in) >> 4];
	25	out++ = hex[((unsigned char)in) & 15];
	26	} else
	27	out++ = in;
	28	in++;
	29	candot = 1;
	30	}
	31	*out = '\0';
	32	return;
	33	}
	34
d1622aed	35	static void unmungestr(char in, char out, int outlen) {
d5859615	36	while (*in) {
	37	if (*in == '%' && in[1] && in[2]) {
	38	int i, j;
	39
	40	i = in[1] - '0'; i -= (i > 9 ? 7 : 0);
	41	j = in[2] - '0'; j -= (j > 9 ? 7 : 0);
	42
	43	*out++ = (i<<4) + j;
d1622aed	44	if (!--outlen) return;
d5859615	45	in += 3;
d1622aed	46	} else {
d5859615	47	out++ = in++;
d1622aed	48	if (!--outlen) return;
d1622aed	49	}
d5859615	50	}
	51	*out = '\0';
	52	return;
	53	}
	54
d1622aed	55	void open_settings_w(char sessionname) {
	56	HKEY subkey1, sesskey;
	57	int ret;
	58	char *p;
	59
	60	p = malloc(3*strlen(sessionname)+1);
	61	mungestr(sessionname, p);
	62
	63	ret = RegCreateKey(HKEY_CURRENT_USER, puttystr, &subkey1);
	64	if (ret != ERROR_SUCCESS) {
	65	free(p);
	66	return NULL;
	67	}
	68	ret = RegCreateKey(subkey1, p, &sesskey);
	69	free(p);
	70	RegCloseKey(subkey1);
	71	if (ret != ERROR_SUCCESS)
	72	return NULL;
	73	return (void *)sesskey;
	74	}
	75
	76	void write_setting_s(void handle, char key, char *value) {
	77	if (handle)
	78	RegSetValueEx((HKEY)handle, key, 0, REG_SZ, value, 1+strlen(value));
	79	}
	80
	81	void write_setting_i(void handle, char key, int value) {
	82	if (handle)
	83	RegSetValueEx((HKEY)handle, key, 0, REG_DWORD,
	84	(CONST BYTE *)&value, sizeof(value));
	85	}
	86
	87	void close_settings_w(void *handle) {
	88	RegCloseKey((HKEY)handle);
	89	}
	90
	91	void open_settings_r(char sessionname) {
	92	HKEY subkey1, sesskey;
	93	char *p;
	94
	95	p = malloc(3*strlen(sessionname)+1);
	96	mungestr(sessionname, p);
	97
	98	if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS) {
	99	sesskey = NULL;
	100	} else {
	101	if (RegOpenKey(subkey1, p, &sesskey) != ERROR_SUCCESS) {
	102	sesskey = NULL;
	103	}
	104	RegCloseKey(subkey1);
	105	}
	106
	107	free(p);
	108
	109	return (void *)sesskey;
	110	}
	111
	112	char read_setting_s(void handle, char key, char buffer, int buflen) {
	113	DWORD type, size;
	114	size = buflen;
	115
	116	if (!handle \|\|
	117	RegQueryValueEx((HKEY)handle, key, 0,
	118	&type, buffer, &size) != ERROR_SUCCESS \|\|
119	type != REG_SZ)
120	return NULL;
121	else
122	return buffer;
123	}
d5859615	124
d1622aed	125	int read_setting_i(void handle, char key, int defvalue) {
	126	DWORD type, val, size;
	127	size = sizeof(val);
	128
	129	if (!handle \|\|
	130	RegQueryValueEx((HKEY)handle, key, 0, &type,
	131	(BYTE *)&val, &size) != ERROR_SUCCESS \|\|
	132	size != sizeof(val) \|\| type != REG_DWORD)
	133	return defvalue;
	134	else
	135	return val;
	136	}
	137
	138	void close_settings_r(void *handle) {
	139	RegCloseKey((HKEY)handle);
	140	}
	141
	142	void del_settings (char *sessionname) {
	143	HKEY subkey1;
	144	char *p;
	145
	146	if (RegOpenKey(HKEY_CURRENT_USER, puttystr, &subkey1) != ERROR_SUCCESS)
	147	return;
	148
	149	p = malloc(3*strlen(sessionname)+1);
	150	mungestr(sessionname, p);
	151	RegDeleteKey(subkey1, p);
	152	free(p);
	153
	154	RegCloseKey(subkey1);
	155	}
d5859615	156
	157	static void hostkey_regname(char buffer, char hostname, char *keytype) {
	158	strcpy(buffer, keytype);
	159	strcat(buffer, "@");
	160	mungestr(hostname, buffer + strlen(buffer));
	161	}
	162
d1622aed	163	struct enumsettings {
	164	HKEY key;
	165	int i;
	166	};
	167
	168	void *enum_settings_start(void) {
	169	struct enumsettings *ret;
	170	HKEY key;
	171
	172	if (RegCreateKey(HKEY_CURRENT_USER, puttystr, &key) != ERROR_SUCCESS)
	173	return NULL;
	174
	175	ret = malloc(sizeof(*ret));
	176	if (ret) {
	177	ret->key = key;
	178	ret->i = 0;
	179	}
	180
	181	return ret;
	182	}
	183
	184	char enum_settings_next(void handle, char *buffer, int buflen) {
	185	struct enumsettings e = (struct enumsettings )handle;
	186	char *otherbuf;
	187	otherbuf = malloc(3*buflen);
	188	if (otherbuf && RegEnumKey(e->key, e->i++, otherbuf,
	189	3*buflen) == ERROR_SUCCESS) {
	190	unmungestr(otherbuf, buffer, buflen);
	191	free(otherbuf);
	192	return buffer;
	193	} else
	194	return NULL;
	195
	196	}
	197
	198	void enum_settings_finish(void *handle) {
	199	struct enumsettings e = (struct enumsettings )handle;
	200	RegCloseKey(e->key);
	201	free(e);
	202	}
	203
d5859615	204	int verify_host_key(char hostname, char keytype, char *key) {
	205	char otherstr, regname;
	206	int len;
	207	HKEY rkey;
	208	DWORD readlen;
	209	DWORD type;
	210	int ret, compare;
	211
	212	len = 1 + strlen(key);
	213
	214	/*
	215	* Now read a saved key in from the registry and see what it
	216	* says.
	217	*/
	218	otherstr = smalloc(len);
	219	regname = smalloc(3*(strlen(hostname)+strlen(keytype))+5);
	220	if (!otherstr \|\| !regname)
	221	fatalbox("Out of memory");
	222
	223	hostkey_regname(regname, hostname, keytype);
	224
	225	if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
	226	&rkey) != ERROR_SUCCESS)
	227	return 1; /* key does not exist in registry */
	228
	229	readlen = len;
	230	ret = RegQueryValueEx(rkey, regname, NULL, &type, otherstr, &readlen);
	231
	232	if (ret != ERROR_SUCCESS && ret != ERROR_MORE_DATA &&
	233	!strcmp(keytype, "rsa")) {
	234	/*
	235	* Key didn't exist. If the key type is RSA, we'll try
	236	* another trick, which is to look up the _old_ key format
	237	* under just the hostname and translate that.
	238	*/
	239	char *justhost = regname + 1 + strlen(keytype);
	240	char oldstyle = smalloc(len + 10); / safety margin */
	241	readlen = len;
	242	ret = RegQueryValueEx(rkey, justhost, NULL, &type,
	243	oldstyle, &readlen);
	244
	245	if (ret == ERROR_SUCCESS && type == REG_SZ) {
	246	/*
	247	* The old format is two old-style bignums separated by
	248	* a slash. An old-style bignum is made of groups of
	249	* four hex digits: digits are ordered in sensible
	250	* (most to least significant) order within each group,
	251	* but groups are ordered in silly (least to most)
	252	* order within the bignum. The new format is two
	253	* ordinary C-format hex numbers (0xABCDEFG...XYZ, with
	254	* A nonzero except in the special case 0x0, which
	255	* doesn't appear anyway in RSA keys) separated by a
	256	* comma. All hex digits are lowercase in both formats.
	257	*/
	258	char *p = otherstr;
	259	char *q = oldstyle;
	260	int i, j;
	261
	262	for (i = 0; i < 2; i++) {
	263	int ndigits, nwords;
	264	p++ = '0'; p++ = 'x';
	265	ndigits = strcspn(q, "/"); /* find / or end of string */
	266	nwords = ndigits / 4;
	267	/* now trim ndigits to remove leading zeros */
268	while (q[ (ndigits-1) ^ 3 ] == '0' && ndigits > 1)
269	ndigits--;
270	/* now move digits over to new string */
271	for (j = 0; j < ndigits; j++)
272	p[ndigits-1-j] = q[j^3];
273	p += ndigits;
274	q += nwords*4;
275	if (*q) {
276	q++; /* eat the slash */
277	p++ = ','; / add a comma */
278	}
279	p = '\0'; / terminate the string */
280	}
281
282	/*
283	* Now _if_ this key matches, we'll enter it in the new
284	* format. If not, we'll assume something odd went
285	* wrong, and hyper-cautiously do nothing.
286	*/
287	if (!strcmp(otherstr, key))
288	RegSetValueEx(rkey, regname, 0, REG_SZ, otherstr,
289	strlen(otherstr)+1);
290	}
291	}
292
293	RegCloseKey(rkey);
294
295	compare = strcmp(otherstr, key);
296
297	sfree(otherstr);
298	sfree(regname);
299
300	if (ret == ERROR_MORE_DATA \|\|
301	(ret == ERROR_SUCCESS && type == REG_SZ && compare))
302	return 2; /* key is different in registry */
303	else if (ret != ERROR_SUCCESS \|\| type != REG_SZ)
304	return 1; /* key does not exist in registry */
305	else
306	return 0; /* key matched OK in registry */
307	}
308
309	void store_host_key(char hostname, char keytype, char *key) {
310	char *regname;
311	HKEY rkey;
312
313	regname = smalloc(3*(strlen(hostname)+strlen(keytype))+5);
314	if (!regname)
315	fatalbox("Out of memory");
316
317	hostkey_regname(regname, hostname, keytype);
318
319	if (RegCreateKey(HKEY_CURRENT_USER, PUTTY_REG_POS "\\SshHostKeys",
320	&rkey) != ERROR_SUCCESS)
321	return; /* key does not exist in registry */
322	RegSetValueEx(rkey, regname, 0, REG_SZ, key,
323	strlen(key)+1);
324	RegCloseKey(rkey);
325	}
326
327	/*
328	* Find the random seed file path and store it in `seedpath'.
329	*/
330	static void get_seedpath(void) {
331	HKEY rkey;
332	DWORD type, size;
333
334	size = sizeof(seedpath);
335
336	if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &rkey)==ERROR_SUCCESS) {
337	int ret = RegQueryValueEx(rkey, "RandSeedFile",
338	0, &type, seedpath, &size);
339	if (ret != ERROR_SUCCESS \|\| type != REG_SZ)
340	seedpath[0] = '\0';
341	RegCloseKey(rkey);
342	} else
343	seedpath[0] = '\0';
344
345	if (!seedpath[0]) {
346	int len, ret;
347
348	len = GetEnvironmentVariable("HOMEDRIVE", seedpath, sizeof(seedpath));
349	ret = GetEnvironmentVariable("HOMEPATH", seedpath+len,
350	sizeof(seedpath)-len);
351	if (ret == 0) { /* probably win95; store in \WINDOWS */
352	GetWindowsDirectory(seedpath, sizeof(seedpath));
353	len = strlen(seedpath);
354	} else
355	len += ret;
356	strcpy(seedpath+len, "\\PUTTY.RND");
357	}
358	}
359
360	void read_random_seed(noise_consumer_t consumer) {
361	HANDLE seedf;
362
363	if (!seedpath[0])
364	get_seedpath();
365
366	seedf = CreateFile(seedpath, GENERIC_READ,
367	FILE_SHARE_READ \| FILE_SHARE_WRITE,
368	NULL, OPEN_EXISTING, 0, NULL);
369
370	if (seedf != INVALID_HANDLE_VALUE) {
371	while (1) {
372	char buf[1024];
373	DWORD len;
374
375	if (ReadFile(seedf, buf, sizeof(buf), &len, NULL) && len)
376	consumer(buf, len);
377	else
378	break;
379	}
380	CloseHandle(seedf);
381	}
382	}
383
d1622aed	384	void write_random_seed(void *data, int len) {
d5859615	385	HANDLE seedf;
	386
	387	if (!seedpath[0])
	388	get_seedpath();
	389
	390	seedf = CreateFile(seedpath, GENERIC_WRITE, 0,
	391	NULL, CREATE_ALWAYS, FILE_ATTRIBUTE_NORMAL, NULL);
	392
	393	if (seedf != INVALID_HANDLE_VALUE) {
	394	DWORD lenwritten;
	395
	396	WriteFile(seedf, data, len, &lenwritten, NULL);
	397	CloseHandle(seedf);
	398	}
	399	}
	400
	401	/*
	402	* Recursively delete a registry key and everything under it.
	403	*/
	404	static void registry_recursive_remove(HKEY key) {
	405	DWORD i;
	406	char name[MAX_PATH+1];
	407	HKEY subkey;
	408
	409	i = 0;
	410	while (RegEnumKey(key, i, name, sizeof(name)) == ERROR_SUCCESS) {
	411	if (RegOpenKey(key, name, &subkey) == ERROR_SUCCESS) {
	412	registry_recursive_remove(subkey);
	413	RegCloseKey(subkey);
	414	}
	415	RegDeleteKey(key, name);
	416	}
	417	}
	418
	419	void cleanup_all(void) {
	420	HKEY key;
	421	int ret;
	422	char name[MAX_PATH+1];
	423
	424	/* ------------------------------------------------------------
	425	* Wipe out the random seed file.
	426	*/
	427	if (!seedpath[0])
	428	get_seedpath();
	429	remove(seedpath);
	430
	431	/* ------------------------------------------------------------
	432	* Destroy all registry information associated with PuTTY.
	433	*/
	434
	435	/*
	436	* Open the main PuTTY registry key and remove everything in it.
	437	*/
	438	if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_POS, &key) == ERROR_SUCCESS) {
	439	registry_recursive_remove(key);
	440	RegCloseKey(key);
	441	}
	442	/*
	443	* Now open the parent key and remove the PuTTY main key. Once
	444	* we've done that, see if the parent key has any other
	445	* children.
	446	*/
	447	if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_PARENT,
	448	&key) == ERROR_SUCCESS) {
449	RegDeleteKey(key, PUTTY_REG_PARENT_CHILD);
450	ret = RegEnumKey(key, 0, name, sizeof(name));
451	RegCloseKey(key);
452	/*
453	* If the parent key had no other children, we must delete
454	* it in its turn. That means opening the _grandparent_
455	* key.
456	*/
457	if (ret != ERROR_SUCCESS) {
458	if (RegOpenKey(HKEY_CURRENT_USER, PUTTY_REG_GPARENT,
459	&key) == ERROR_SUCCESS) {
460	RegDeleteKey(key, PUTTY_REG_GPARENT_CHILD);
461	RegCloseKey(key);
462	}
463	}
464	}
465	/*
466	* Now we're done.
467	*/
468	}