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authorGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-06-13 09:55:13 +0000
committerGravatar Denis Vlasenko <vda.linux@googlemail.com>2008-06-13 09:55:13 +0000
commit25b463079d963ae4f482db7ced14d14c28b907b8 (patch)
tree80ff01df839338048b35d9abfd2a667fbe68a30a /networking/httpd.c
parent0eb406caa85d6203b9d80da89e197f0b3e9fcc1d (diff)
downloadbusybox-25b463079d963ae4f482db7ced14d14c28b907b8.tar.gz
busybox-25b463079d963ae4f482db7ced14d14c28b907b8.tar.bz2
httpd: fix bugs in authentication (by Peter Korsgaard <jacmet ATuclibc.org>)
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
Diffstat (limited to 'networking/httpd.c')
-rw-r--r--networking/httpd.c98
1 files changed, 52 insertions, 46 deletions
diff --git a/networking/httpd.c b/networking/httpd.c
index e3c1a4e11..382893bfb 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -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 */
- 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 */
+ 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;
}
+
+ 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;
}
+ }
- if (strcmp(p, request) == 0) {
+ /* 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