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httpd: fix bugs in authentication (by Peter Korsgaard <jacmet ATuclibc.org>)

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we were accepting empty username; also we were always checking
 dummy user:passwd pair ":" if user gave us wrong one.

function                                             old     new   delta
check_user_passwd                                    338     319     -19
This commit is contained in:
Denis Vlasenko 2008-06-13 09:55:13 +00:00
parent 0eb406caa8
commit 25b463079d
1 changed files with 53 additions and 47 deletions
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100
networking/httpd.c
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@ -1664,70 +1664,76 @@ static int checkPermIP(void)
*
* Returns 1 if user_and_passwd is OK.
*/
static int check_user_passwd(const char *path, const char *request)
static int check_user_passwd(const char *path, const char *user_and_passwd)
{
Htaccess *cur;
const char *p;
const char *p0;
const char *prev = NULL;
/* This could stand some work */
for (cur = g_auth; cur; cur = cur->next) {
size_t l;
const char *dir_prefix;
size_t len;
dir_prefix = cur->before_colon;
/* WHY? */
/* If already saw a match, don't accept other different matches */
if (prev && strcmp(prev, dir_prefix) != 0)
continue;
p0 = cur->before_colon;
if (prev != NULL && strcmp(prev, p0) != 0)
continue; /* find next identical */
p = cur->after_colon;
if (DEBUG)
fprintf(stderr, "checkPerm: '%s' ? '%s'\n", p0, request);
fprintf(stderr, "checkPerm: '%s' ? '%s'\n", dir_prefix, user_and_passwd);
l = strlen(p0);
if (strncmp(p0, path, l) == 0
&& (l == 1 || path[l] == '/' || path[l] == '\0')
/* If it's not a prefix match, continue searching */
len = strlen(dir_prefix);
if (len != 1 /* dir_prefix "/" matches all, don't need to check */
&& (strncmp(dir_prefix, path, len) != 0
|| (path[len] != '/' && path[len] != '\0'))
) {
char *u;
/* path match found. Check request */
/* for check next /path:user:password */
prev = p0;
u = strchr(request, ':');
if (u == NULL) {
/* bad request, ':' required */
break;
}
continue;
}
if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
char *pp;
/* Path match found */
prev = dir_prefix;
if (strncmp(p, request, u - request) != 0) {
/* user doesn't match */
if (ENABLE_FEATURE_HTTPD_AUTH_MD5) {
char *md5_passwd;
md5_passwd = strchr(cur->after_colon, ':');
if (md5_passwd && md5_passwd[1] == '$' && md5_passwd[2] == '1'
&& md5_passwd[3] == '$' && md5_passwd[4]
) {
char *encrypted;
int r, user_len_p1;
md5_passwd++;
user_len_p1 = md5_passwd - cur->after_colon;
/* comparing "user:" */
if (strncmp(cur->after_colon, user_and_passwd, user_len_p1) != 0) {
continue;
}
pp = strchr(p, ':');
if (pp && pp[1] == '$' && pp[2] == '1'
&& pp[3] == '$' && pp[4]
) {
char *encrypted = pw_encrypt(u+1, ++pp, 1);
int r = strcmp(encrypted, pp);
free(encrypted);
if (r == 0)
goto set_remoteuser_var; /* Ok */
/* unauthorized */
continue;
}
}
if (strcmp(p, request) == 0) {
encrypted = pw_encrypt(
user_and_passwd + user_len_p1 /* cleartext pwd from user */,
md5_passwd /*salt */, 1 /* cleanup */);
r = strcmp(encrypted, md5_passwd);
free(encrypted);
if (r == 0)
goto set_remoteuser_var; /* Ok */
continue;
}
}
/* Comparing plaintext "user:pass" in one go */
if (strcmp(cur->after_colon, user_and_passwd) == 0) {
set_remoteuser_var:
remoteuser = xstrndup(request, u - request);
return 1; /* Ok */
}
/* unauthorized */
remoteuser = xstrndup(user_and_passwd,
strchrnul(user_and_passwd, ':') - user_and_passwd);
return 1; /* Ok */
}
} /* for */
return prev == NULL;
/* 0(bad) if prev is set: matches were found but passwd was wrong */
return (prev == NULL);
}
#endif /* FEATURE_HTTPD_BASIC_AUTH */
@ -2039,7 +2045,7 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
/* Case: no "Authorization:" was seen, but page does require passwd.
* Check that with dummy user:pass */
if ((authorized <= 0) && check_user_passwd(urlcopy, ":") == 0) {
if ((authorized < 0) && check_user_passwd(urlcopy, ":") == 0) {
send_headers_and_exit(HTTP_UNAUTHORIZED);
}
#endif