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putty-source/unix/storage.c

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/*
* storage.c: Unix-specific implementation of the interface defined
* in storage.h.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#include <errno.h>
#include <ctype.h>
#include <limits.h>
#include <unistd.h>
#include <fcntl.h>
#include <dirent.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <pwd.h>
#include "putty.h"
#include "storage.h"
#include "tree234.h"
#ifdef PATH_MAX
#define FNLEN PATH_MAX
#else
#define FNLEN 1024 /* XXX */
#endif
enum {
INDEX_DIR, INDEX_HOSTKEYS, INDEX_HOSTKEYS_TMP, INDEX_RANDSEED,
INDEX_SESSIONDIR, INDEX_SESSION, INDEX_HOSTCADIR, INDEX_HOSTCA
};
static const char hex[16] = "0123456789ABCDEF";
static void make_session_filename(const char *in, strbuf *out)
{
if (!in || !*in)
in = "Default Settings";
while (*in) {
/*
* There are remarkably few punctuation characters that
* aren't shell-special in some way or likely to be used as
* separators in some file format or another! Hence we use
* opt-in for safe characters rather than opt-out for
* specific unsafe ones...
*/
if (*in!='+' && *in!='-' && *in!='.' && *in!='@' && *in!='_' &&
!(*in >= '0' && *in <= '9') &&
!(*in >= 'A' && *in <= 'Z') &&
!(*in >= 'a' && *in <= 'z')) {
put_byte(out, '%');
put_byte(out, hex[((unsigned char) *in) >> 4]);
put_byte(out, hex[((unsigned char) *in) & 15]);
} else
put_byte(out, *in);
in++;
}
}
static void decode_session_filename(const char *in, strbuf *out)
{
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);
put_byte(out, (i << 4) + j);
in += 3;
} else {
put_byte(out, *in++);
}
}
}
static char *make_filename(int index, const char *subname)
{
char *env, *tmp, *ret;
/*
* Allow override of the PuTTY configuration location, and of
* specific subparts of it, by means of environment variables.
*/
if (index == INDEX_DIR) {
struct passwd *pwd;
char *xdg_dir, *old_dir, *old_dir2, *old_dir3, *home, *pwd_home;
env = getenv("PUTTYDIR");
if (env)
return dupstr(env);
home = getenv("HOME");
pwd = getpwuid(getuid());
if (pwd && pwd->pw_dir) {
pwd_home = pwd->pw_dir;
} else {
pwd_home = NULL;
}
xdg_dir = NULL;
env = getenv("XDG_CONFIG_HOME");
if (env && *env) {
xdg_dir = dupprintf("%s/putty", env);
}
if (!xdg_dir) {
if (home) {
tmp = home;
} else if (pwd_home) {
tmp = pwd_home;
} else {
tmp = "";
}
xdg_dir = dupprintf("%s/.config/putty", tmp);
}
if (xdg_dir && access(xdg_dir, F_OK) == 0) {
return xdg_dir;
}
old_dir = old_dir2 = old_dir3 = NULL;
if (home) {
old_dir = dupprintf("%s/.putty", home);
}
if (pwd_home) {
old_dir2 = dupprintf("%s/.putty", pwd_home);
}
old_dir3 = dupstr("/.putty");
if (old_dir && access(old_dir, F_OK) == 0) {
ret = old_dir;
goto out;
}
if (old_dir2 && access(old_dir2, F_OK) == 0) {
ret = old_dir2;
goto out;
}
if (access(old_dir3, F_OK) == 0) {
ret = old_dir3;
goto out;
}
#ifdef XDG_DEFAULT
if (xdg_dir) {
ret = xdg_dir;
goto out;
}
#endif
ret = old_dir ? old_dir : (old_dir2 ? old_dir2 : old_dir3);
out:
if (ret != old_dir)
sfree(old_dir);
if (ret != old_dir2)
sfree(old_dir2);
if (ret != old_dir3)
sfree(old_dir3);
if (ret != xdg_dir)
sfree(xdg_dir);
return ret;
}
if (index == INDEX_SESSIONDIR) {
env = getenv("PUTTYSESSIONS");
if (env)
return dupstr(env);
tmp = make_filename(INDEX_DIR, NULL);
ret = dupprintf("%s/sessions", tmp);
sfree(tmp);
return ret;
}
if (index == INDEX_SESSION) {
strbuf *sb = strbuf_new();
tmp = make_filename(INDEX_SESSIONDIR, NULL);
put_fmt(sb, "%s/", tmp);
sfree(tmp);
make_session_filename(subname, sb);
return strbuf_to_str(sb);
}
if (index == INDEX_HOSTKEYS) {
env = getenv("PUTTYSSHHOSTKEYS");
if (env)
return dupstr(env);
tmp = make_filename(INDEX_DIR, NULL);
ret = dupprintf("%s/sshhostkeys", tmp);
sfree(tmp);
return ret;
}
if (index == INDEX_HOSTKEYS_TMP) {
tmp = make_filename(INDEX_HOSTKEYS, NULL);
ret = dupprintf("%s.tmp", tmp);
sfree(tmp);
return ret;
}
if (index == INDEX_RANDSEED) {
env = getenv("PUTTYRANDOMSEED");
if (env)
return dupstr(env);
tmp = make_filename(INDEX_DIR, NULL);
ret = dupprintf("%s/randomseed", tmp);
sfree(tmp);
return ret;
}
if (index == INDEX_HOSTCADIR) {
env = getenv("PUTTYSSHHOSTCAS");
if (env)
return dupstr(env);
tmp = make_filename(INDEX_DIR, NULL);
ret = dupprintf("%s/sshhostcas", tmp);
sfree(tmp);
return ret;
}
if (index == INDEX_HOSTCA) {
strbuf *sb = strbuf_new();
tmp = make_filename(INDEX_HOSTCADIR, NULL);
put_fmt(sb, "%s/", tmp);
sfree(tmp);
make_session_filename(subname, sb);
return strbuf_to_str(sb);
}
tmp = make_filename(INDEX_DIR, NULL);
ret = dupprintf("%s/ERROR", tmp);
sfree(tmp);
return ret;
}
struct settings_w {
FILE *fp;
};
settings_w *open_settings_w(const char *sessionname, char **errmsg)
{
char *filename, *err;
FILE *fp;
*errmsg = NULL;
/*
* Start by making sure the .putty directory and its sessions
* subdir actually exist.
*/
filename = make_filename(INDEX_DIR, NULL);
if ((err = make_dir_path(filename, 0700)) != NULL) {
*errmsg = dupprintf("Unable to save session: %s", err);
sfree(err);
sfree(filename);
return NULL;
}
sfree(filename);
filename = make_filename(INDEX_SESSIONDIR, NULL);
if ((err = make_dir_path(filename, 0700)) != NULL) {
*errmsg = dupprintf("Unable to save session: %s", err);
sfree(err);
sfree(filename);
return NULL;
}
sfree(filename);
filename = make_filename(INDEX_SESSION, sessionname);
fp = fopen(filename, "w");
if (!fp) {
*errmsg = dupprintf("Unable to save session: open(\"%s\") "
"returned '%s'", filename, strerror(errno));
sfree(filename);
return NULL; /* can't open */
}
sfree(filename);
settings_w *toret = snew(settings_w);
toret->fp = fp;
return toret;
}
void write_setting_s(settings_w *handle, const char *key, const char *value)
{
fprintf(handle->fp, "%s=%s\n", key, value);
}
void write_setting_i(settings_w *handle, const char *key, int value)
{
fprintf(handle->fp, "%s=%d\n", key, value);
}
void close_settings_w(settings_w *handle)
{
fclose(handle->fp);
sfree(handle);
}
/* ----------------------------------------------------------------------
* System for treating X resources as a fallback source of defaults,
* after data read from a saved-session disk file.
*
* The read_setting_* functions will call get_setting(key) as a
* fallback if the setting isn't in the file they loaded. That in turn
* will hand on to x_get_default, which the front end application
* provides, and which actually reads resources from the X server (if
* appropriate). In between, there's a tree234 of X-resource shaped
* settings living locally in this file: the front end can call
* provide_xrm_string() to insert a setting into this tree (typically
* in response to an -xrm command line option or similar), and those
* will override the actual X resources.
*/
struct skeyval {
const char *key;
const char *value;
};
static tree234 *xrmtree = NULL;
static int keycmp(void *av, void *bv)
{
struct skeyval *a = (struct skeyval *)av;
struct skeyval *b = (struct skeyval *)bv;
return strcmp(a->key, b->key);
}
void provide_xrm_string(const char *string, const char *progname)
{
const char *p, *q;
char *key;
struct skeyval *xrms, *ret;
p = q = strchr(string, ':');
if (!q) {
fprintf(stderr, "%s: expected a colon in resource string"
" \"%s\"\n", progname, string);
return;
}
q++;
while (p > string && p[-1] != '.' && p[-1] != '*')
p--;
xrms = snew(struct skeyval);
key = snewn(q-p, char);
memcpy(key, p, q-p);
key[q-p-1] = '\0';
xrms->key = key;
while (*q && isspace((unsigned char)*q))
q++;
xrms->value = dupstr(q);
if (!xrmtree)
xrmtree = newtree234(keycmp);
ret = add234(xrmtree, xrms);
if (ret) {
/* Override an existing string. */
del234(xrmtree, ret);
add234(xrmtree, xrms);
}
}
static const char *get_setting(const char *key)
{
struct skeyval tmp, *ret;
tmp.key = key;
if (xrmtree) {
ret = find234(xrmtree, &tmp, NULL);
if (ret)
return ret->value;
}
return x_get_default(key);
}
/* ----------------------------------------------------------------------
* Main code for reading settings from a disk file, calling the above
* get_setting() as a fallback if necessary.
*/
struct settings_r {
tree234 *t;
};
settings_r *open_settings_r(const char *sessionname)
{
char *filename;
FILE *fp;
char *line;
settings_r *toret;
filename = make_filename(INDEX_SESSION, sessionname);
fp = fopen(filename, "r");
sfree(filename);
if (!fp)
return NULL; /* can't open */
toret = snew(settings_r);
toret->t = newtree234(keycmp);
while ( (line = fgetline(fp)) ) {
char *value = strchr(line, '=');
struct skeyval *kv;
if (!value) {
sfree(line);
continue;
}
*value++ = '\0';
value[strcspn(value, "\r\n")] = '\0'; /* trim trailing NL */
kv = snew(struct skeyval);
kv->key = dupstr(line);
kv->value = dupstr(value);
add234(toret->t, kv);
sfree(line);
}
fclose(fp);
return toret;
}
char *read_setting_s(settings_r *handle, const char *key)
{
const char *val;
struct skeyval tmp, *kv;
tmp.key = key;
if (handle != NULL &&
(kv = find234(handle->t, &tmp, NULL)) != NULL) {
val = kv->value;
assert(val != NULL);
} else
val = get_setting(key);
if (!val)
return NULL;
else
return dupstr(val);
}
int read_setting_i(settings_r *handle, const char *key, int defvalue)
{
const char *val;
struct skeyval tmp, *kv;
tmp.key = key;
if (handle != NULL &&
(kv = find234(handle->t, &tmp, NULL)) != NULL) {
val = kv->value;
assert(val != NULL);
} else
val = get_setting(key);
if (!val)
return defvalue;
else
return atoi(val);
}
FontSpec *read_setting_fontspec(settings_r *handle, const char *name)
{
/*
* In GTK1-only PuTTY, we used to store font names simply as a
* valid X font description string (logical or alias), under a
* bare key such as "Font".
*
* In GTK2 PuTTY, we have a prefix system where "client:"
* indicates a Pango font and "server:" an X one; existing
* configuration needs to be reinterpreted as having the
* "server:" prefix, so we change the storage key from the
* provided name string (e.g. "Font") to a suffixed one
* ("FontName").
*/
char *suffname = dupcat(name, "Name");
char *tmp;
if ((tmp = read_setting_s(handle, suffname)) != NULL) {
FontSpec *fs = fontspec_new(tmp);
sfree(suffname);
sfree(tmp);
return fs; /* got new-style name */
}
sfree(suffname);
/* Fall back to old-style name. */
tmp = read_setting_s(handle, name);
if (tmp && *tmp) {
char *tmp2 = dupcat("server:", tmp);
FontSpec *fs = fontspec_new(tmp2);
sfree(tmp2);
sfree(tmp);
return fs;
} else {
sfree(tmp);
return NULL;
}
}
Filename *read_setting_filename(settings_r *handle, const char *name)
{
char *tmp = read_setting_s(handle, name);
if (tmp) {
Filename *ret = filename_from_str(tmp);
sfree(tmp);
return ret;
} else
return NULL;
}
void write_setting_fontspec(settings_w *handle, const char *name, FontSpec *fs)
{
/*
* read_setting_fontspec had to handle two cases, but when
* writing our settings back out we simply always generate the
* new-style name.
*/
char *suffname = dupcat(name, "Name");
write_setting_s(handle, suffname, fs->name);
sfree(suffname);
}
void write_setting_filename(settings_w *handle,
const char *name, Filename *result)
{
write_setting_s(handle, name, result->path);
}
void close_settings_r(settings_r *handle)
{
struct skeyval *kv;
if (!handle)
return;
while ( (kv = index234(handle->t, 0)) != NULL) {
del234(handle->t, kv);
sfree((char *)kv->key);
sfree((char *)kv->value);
sfree(kv);
}
freetree234(handle->t);
sfree(handle);
}
void del_settings(const char *sessionname)
{
char *filename;
filename = make_filename(INDEX_SESSION, sessionname);
unlink(filename);
sfree(filename);
}
struct settings_e {
DIR *dp;
};
settings_e *enum_settings_start(void)
{
DIR *dp;
char *filename;
filename = make_filename(INDEX_SESSIONDIR, NULL);
dp = opendir(filename);
sfree(filename);
settings_e *toret = snew(settings_e);
toret->dp = dp;
return toret;
}
static bool enum_dir_next(DIR *dp, int index, strbuf *out)
{
struct dirent *de;
struct stat st;
strbuf *fullpath;
if (!dp)
return false;
fullpath = strbuf_new();
char *sessiondir = make_filename(index, NULL);
put_dataz(fullpath, sessiondir);
sfree(sessiondir);
put_byte(fullpath, '/');
size_t baselen = fullpath->len;
while ( (de = readdir(dp)) != NULL ) {
strbuf_shrink_to(fullpath, baselen);
put_dataz(fullpath, de->d_name);
if (stat(fullpath->s, &st) < 0 || !S_ISREG(st.st_mode))
continue; /* try another one */
decode_session_filename(de->d_name, out);
strbuf_free(fullpath);
return true;
}
strbuf_free(fullpath);
return false;
}
bool enum_settings_next(settings_e *handle, strbuf *out)
{
return enum_dir_next(handle->dp, INDEX_SESSIONDIR, out);
}
void enum_settings_finish(settings_e *handle)
{
if (handle->dp)
closedir(handle->dp);
sfree(handle);
}
struct host_ca_enum {
DIR *dp;
};
host_ca_enum *enum_host_ca_start(void)
{
host_ca_enum *handle = snew(host_ca_enum);
char *filename = make_filename(INDEX_HOSTCADIR, NULL);
handle->dp = opendir(filename);
sfree(filename);
return handle;
}
bool enum_host_ca_next(host_ca_enum *handle, strbuf *out)
{
return enum_dir_next(handle->dp, INDEX_HOSTCADIR, out);
}
void enum_host_ca_finish(host_ca_enum *handle)
{
if (handle->dp)
closedir(handle->dp);
sfree(handle);
}
host_ca *host_ca_load(const char *name)
{
char *filename = make_filename(INDEX_HOSTCA, name);
FILE *fp = fopen(filename, "r");
sfree(filename);
if (!fp)
return NULL;
host_ca *hca = host_ca_new();
hca->name = dupstr(name);
char *line;
CertExprBuilder *eb = NULL;
while ( (line = fgetline(fp)) ) {
char *value = strchr(line, '=');
if (!value) {
sfree(line);
continue;
}
*value++ = '\0';
value[strcspn(value, "\r\n")] = '\0'; /* trim trailing NL */
if (!strcmp(line, "PublicKey")) {
hca->ca_public_key = base64_decode_sb(ptrlen_from_asciz(value));
} else if (!strcmp(line, "MatchHosts")) {
if (!eb)
eb = cert_expr_builder_new();
cert_expr_builder_add(eb, value);
} else if (!strcmp(line, "Validity")) {
hca->validity_expression = strbuf_to_str(
percent_decode_sb(ptrlen_from_asciz(value)));
} else if (!strcmp(line, "PermitRSASHA1")) {
hca->opts.permit_rsa_sha1 = atoi(value);
} else if (!strcmp(line, "PermitRSASHA256")) {
hca->opts.permit_rsa_sha256 = atoi(value);
} else if (!strcmp(line, "PermitRSASHA512")) {
hca->opts.permit_rsa_sha512 = atoi(value);
}
sfree(line);
}
fclose(fp);
if (eb) {
if (!hca->validity_expression) {
hca->validity_expression = cert_expr_expression(eb);
}
cert_expr_builder_free(eb);
}
return hca;
}
char *host_ca_save(host_ca *hca)
{
if (!*hca->name)
return dupstr("CA record must have a name");
char *filename = make_filename(INDEX_HOSTCA, hca->name);
FILE *fp = fopen(filename, "w");
if (!fp)
return dupprintf("Unable to open file '%s'", filename);
fprintf(fp, "PublicKey=");
base64_encode_fp(fp, ptrlen_from_strbuf(hca->ca_public_key), 0);
fprintf(fp, "\n");
fprintf(fp, "Validity=");
percent_encode_fp(fp, ptrlen_from_asciz(hca->validity_expression), NULL);
fprintf(fp, "\n");
fprintf(fp, "PermitRSASHA1=%d\n", (int)hca->opts.permit_rsa_sha1);
fprintf(fp, "PermitRSASHA256=%d\n", (int)hca->opts.permit_rsa_sha256);
fprintf(fp, "PermitRSASHA512=%d\n", (int)hca->opts.permit_rsa_sha512);
bool bad = ferror(fp);
if (fclose(fp) < 0)
bad = true;
char *err = NULL;
if (bad)
err = dupprintf("Unable to write file '%s'", filename);
sfree(filename);
return err;
}
char *host_ca_delete(const char *name)
{
if (!*name)
return dupstr("CA record must have a name");
char *filename = make_filename(INDEX_HOSTCA, name);
bool bad = remove(filename) < 0;
char *err = NULL;
if (bad)
err = dupprintf("Unable to delete file '%s'", filename);
sfree(filename);
return err;
}
/*
* Lines in the host keys file are of the form
*
* type@port:hostname keydata
*
* e.g.
*
* rsa@22:foovax.example.org 0x23,0x293487364395345345....2343
*/
int check_stored_host_key(const char *hostname, int port,
const char *keytype, const char *key)
{
FILE *fp;
char *filename;
char *line;
int ret;
filename = make_filename(INDEX_HOSTKEYS, NULL);
fp = fopen(filename, "r");
sfree(filename);
if (!fp)
return 1; /* key does not exist */
ret = 1;
while ( (line = fgetline(fp)) ) {
int i;
char *p = line;
char porttext[20];
line[strcspn(line, "\n")] = '\0'; /* strip trailing newline */
i = strlen(keytype);
if (strncmp(p, keytype, i))
goto done;
p += i;
if (*p != '@')
goto done;
p++;
sprintf(porttext, "%d", port);
i = strlen(porttext);
if (strncmp(p, porttext, i))
goto done;
p += i;
if (*p != ':')
goto done;
p++;
i = strlen(hostname);
if (strncmp(p, hostname, i))
goto done;
p += i;
if (*p != ' ')
goto done;
p++;
/*
* Found the key. Now just work out whether it's the right
* one or not.
*/
if (!strcmp(p, key))
ret = 0; /* key matched OK */
else
ret = 2; /* key mismatch */
done:
sfree(line);
if (ret != 1)
break;
}
fclose(fp);
return ret;
}
bool have_ssh_host_key(const char *hostname, int port,
const char *keytype)
{
/*
* If we have a host key, check_stored_host_key will return 0 or 2.
* If we don't have one, it'll return 1.
*/
return check_stored_host_key(hostname, port, keytype, "") != 1;
}
void store_host_key(const char *hostname, int port,
const char *keytype, const char *key)
{
FILE *rfp, *wfp;
char *newtext, *line;
int headerlen;
char *filename, *tmpfilename;
/*
* Open both the old file and a new file.
*/
tmpfilename = make_filename(INDEX_HOSTKEYS_TMP, NULL);
wfp = fopen(tmpfilename, "w");
if (!wfp && errno == ENOENT) {
char *dir, *errmsg;
dir = make_filename(INDEX_DIR, NULL);
if ((errmsg = make_dir_path(dir, 0700)) != NULL) {
nonfatal("Unable to store host key: %s", errmsg);
sfree(errmsg);
sfree(dir);
sfree(tmpfilename);
return;
}
sfree(dir);
wfp = fopen(tmpfilename, "w");
}
if (!wfp) {
nonfatal("Unable to store host key: open(\"%s\") "
"returned '%s'", tmpfilename, strerror(errno));
sfree(tmpfilename);
return;
}
filename = make_filename(INDEX_HOSTKEYS, NULL);
rfp = fopen(filename, "r");
newtext = dupprintf("%s@%d:%s %s\n", keytype, port, hostname, key);
headerlen = 1 + strcspn(newtext, " "); /* count the space too */
/*
* Copy all lines from the old file to the new one that _don't_
* involve the same host key identifier as the one we're adding.
*/
if (rfp) {
while ( (line = fgetline(rfp)) ) {
if (strncmp(line, newtext, headerlen))
fputs(line, wfp);
sfree(line);
}
fclose(rfp);
}
/*
* Now add the new line at the end.
*/
fputs(newtext, wfp);
fclose(wfp);
if (rename(tmpfilename, filename) < 0) {
nonfatal("Unable to store host key: rename(\"%s\",\"%s\")"
" returned '%s'", tmpfilename, filename,
strerror(errno));
}
sfree(tmpfilename);
sfree(filename);
sfree(newtext);
}
void read_random_seed(noise_consumer_t consumer)
{
int fd;
char *fname;
fname = make_filename(INDEX_RANDSEED, NULL);
fd = open(fname, O_RDONLY);
sfree(fname);
if (fd >= 0) {
char buf[512];
int ret;
while ( (ret = read(fd, buf, sizeof(buf))) > 0)
consumer(buf, ret);
close(fd);
}
}
void write_random_seed(void *data, int len)
{
int fd;
char *fname;
fname = make_filename(INDEX_RANDSEED, NULL);
/*
* Don't truncate the random seed file if it already exists; if
* something goes wrong half way through writing it, it would
* be better to leave the old data there than to leave it empty.
*/
fd = open(fname, O_CREAT | O_WRONLY, 0600);
if (fd < 0) {
if (errno != ENOENT) {
nonfatal("Unable to write random seed: open(\"%s\") "
"returned '%s'", fname, strerror(errno));
sfree(fname);
return;
}
char *dir, *errmsg;
dir = make_filename(INDEX_DIR, NULL);
if ((errmsg = make_dir_path(dir, 0700)) != NULL) {
nonfatal("Unable to write random seed: %s", errmsg);
sfree(errmsg);
sfree(fname);
sfree(dir);
return;
}
sfree(dir);
fd = open(fname, O_CREAT | O_WRONLY, 0600);
if (fd < 0) {
nonfatal("Unable to write random seed: open(\"%s\") "
"returned '%s'", fname, strerror(errno));
sfree(fname);
return;
}
}
while (len > 0) {
int ret = write(fd, data, len);
if (ret < 0) {
nonfatal("Unable to write random seed: write "
"returned '%s'", strerror(errno));
break;
}
len -= ret;
data = (char *)data + len;
}
close(fd);
sfree(fname);
}
void cleanup_all(void)
{
}
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