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-rw-r--r--networking/httpd.c225
1 files changed, 102 insertions, 123 deletions
diff --git a/networking/httpd.c b/networking/httpd.c
index 352a97d3c..e3c1a4e11 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -27,7 +27,7 @@
* Doc:
* "CGI Environment Variables": http://hoohoo.ncsa.uiuc.edu/cgi/env.html
*
- * The server can also be invoked as a url arg decoder and html text encoder
+ * The applet can also be invoked as a url arg decoder and html text encoder
* as follows:
* foo=`httpd -d $foo` # decode "Hello%20World" as "Hello World"
* bar=`httpd -e "<Hello World>"` # encode as "&#60Hello&#32World&#62"
@@ -55,19 +55,11 @@
* .au:audio/basic # additional mime type for audio.au files
* *.php:/path/php # running cgi.php scripts through an interpreter
*
- * A/D may be as a/d or allow/deny - first char case insensitive
- * Deny IP rules take precedence over allow rules.
- *
- *
- * The Deny/Allow IP logic:
- *
- * - Default is to allow all. No addresses are denied unless
- * denied with a D: rule.
- * - Order of Deny/Allow rules is significant
+ * A/D may be as a/d or allow/deny - only first char matters.
+ * Deny/Allow IP logic:
+ * - Default is to allow all (Allow all (A:*) is a no-op).
* - Deny rules take precedence over allow rules.
- * - If a deny all rule (D:*) is used it acts as a catch-all for unmatched
- * addresses.
- * - Specification of Allow all (A:*) is a no-op
+ * - "Deny all" rule (D:*) is applied last.
*
* Example:
* 1. Allow only specified addresses
@@ -494,10 +486,10 @@ static void parse_conf(const char *path, int flag)
|| ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
Htaccess *cur;
#endif
- const char *cf = configFile;
+ const char *filename = configFile;
char buf[160];
- char *p0;
- char *c, *p;
+ char *p, *p0;
+ char *after_colon;
Htaccess_IP *pip;
/* discard old rules */
@@ -520,20 +512,20 @@ static void parse_conf(const char *path, int flag)
}
#endif
- if (flag == SUBDIR_PARSE || cf == NULL) {
- cf = alloca(strlen(path) + sizeof(httpd_conf) + 2);
- sprintf((char *)cf, "%s/%s", path, httpd_conf);
+ if (flag == SUBDIR_PARSE || filename == NULL) {
+ filename = alloca(strlen(path) + sizeof(httpd_conf) + 2);
+ sprintf((char *)filename, "%s/%s", path, httpd_conf);
}
- while ((f = fopen(cf, "r")) == NULL) {
+ while ((f = fopen(filename, "r")) == NULL) {
if (flag == SUBDIR_PARSE || flag == FIND_FROM_HTTPD_ROOT) {
/* config file not found, no changes to config */
return;
}
if (configFile && flag == FIRST_PARSE) /* if -c option given */
- bb_simple_perror_msg_and_die(cf);
+ bb_simple_perror_msg_and_die(filename);
flag = FIND_FROM_HTTPD_ROOT;
- cf = httpd_conf;
+ filename = httpd_conf;
}
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
@@ -541,58 +533,53 @@ static void parse_conf(const char *path, int flag)
#endif
/* This could stand some work */
while ((p0 = fgets(buf, sizeof(buf), f)) != NULL) {
- c = NULL;
+ after_colon = NULL;
for (p = p0; *p0 != '\0' && *p0 != '#'; p0++) {
if (!isspace(*p0)) {
*p++ = *p0;
- if (*p0 == ':' && c == NULL)
- c = p;
+ if (*p0 == ':' && after_colon == NULL)
+ after_colon = p;
}
}
*p = '\0';
/* test for empty or strange line */
- if (c == NULL || *c == '\0')
+ if (after_colon == NULL || *after_colon == '\0')
continue;
p0 = buf;
- if (*p0 == 'd')
- *p0 = 'D';
- if (*c == '*') {
+ if (*p0 == 'd' || *p0 == 'a')
+ *p0 -= 0x20; /* a/d -> A/D */
+ if (*after_colon == '*') {
if (*p0 == 'D') {
- /* memorize deny all */
+ /* memorize "deny all" */
flg_deny_all = 1;
}
- /* skip default other "word:*" config lines */
+ /* skip assumed "A:*", it is a default anyway */
continue;
}
- if (*p0 == 'a')
- *p0 = 'A';
if (*p0 == 'A' || *p0 == 'D') {
/* storing current config IP line */
pip = xzalloc(sizeof(Htaccess_IP));
- if (pip) {
- if (scan_ip_mask(c, &(pip->ip), &(pip->mask))) {
- /* syntax IP{/mask} error detected, protect all */
- *p0 = 'D';
- pip->mask = 0;
- }
- pip->allow_deny = *p0;
- if (*p0 == 'D') {
- /* Deny:from_IP move top */
- pip->next = ip_a_d;
+ if (scan_ip_mask(after_colon, &(pip->ip), &(pip->mask))) {
+ /* IP{/mask} syntax error detected, protect all */
+ *p0 = 'D';
+ pip->mask = 0;
+ }
+ pip->allow_deny = *p0;
+ if (*p0 == 'D') {
+ /* Deny:from_IP - prepend */
+ pip->next = ip_a_d;
+ ip_a_d = pip;
+ } else {
+ /* A:from_IP - append (thus D precedes A) */
+ Htaccess_IP *prev_IP = ip_a_d;
+ if (prev_IP == NULL) {
ip_a_d = pip;
} else {
- /* add to bottom A:form_IP config line */
- Htaccess_IP *prev_IP = ip_a_d;
-
- if (prev_IP == NULL) {
- ip_a_d = pip;
- } else {
- while (prev_IP->next)
- prev_IP = prev_IP->next;
- prev_IP->next = pip;
- }
+ while (prev_IP->next)
+ prev_IP = prev_IP->next;
+ prev_IP->next = pip;
}
}
continue;
@@ -601,24 +588,18 @@ static void parse_conf(const char *path, int flag)
#if ENABLE_FEATURE_HTTPD_ERROR_PAGES
if (flag == FIRST_PARSE && *p0 == 'E') {
unsigned i;
- /* error status code */
- int status = atoi(++p0);
- /* c already points at the character following ':' in parse loop */
- /* c = strchr(p0, ':'); c++; */
+ int status = atoi(++p0); /* error status code */
if (status < HTTP_CONTINUE) {
- bb_error_msg("config error '%s' in '%s'", buf, cf);
+ bb_error_msg("config error '%s' in '%s'", buf, filename);
continue;
}
-
/* then error page; find matching status */
for (i = 0; i < ARRAY_SIZE(http_response_type); i++) {
if (http_response_type[i] == status) {
- // We chdir to home_httpd, thus no need to
- // concat_path_file(home_httpd, c)
- //if (c[0] == '/' || home_httpd[0] != '/')
- http_error_page[i] = xstrdup(c);
- //else
- // http_error_page[i] = concat_path_file(home_httpd, c);
+ /* We chdir to home_httpd, thus no need to
+ * concat_path_file(home_httpd, after_colon)
+ * here */
+ http_error_page[i] = xstrdup(after_colon);
break;
}
}
@@ -632,22 +613,22 @@ static void parse_conf(const char *path, int flag)
char *url_from, *host_port, *url_to;
Htaccess_Proxy *proxy_entry;
- url_from = c;
- host_port = strchr(c, ':');
+ url_from = after_colon;
+ host_port = strchr(after_colon, ':');
if (host_port == NULL) {
- bb_error_msg("config error '%s' in '%s'", buf, cf);
+ bb_error_msg("config error '%s' in '%s'", buf, filename);
continue;
}
*host_port++ = '\0';
if (strncmp(host_port, "http://", 7) == 0)
host_port += 7;
if (*host_port == '\0') {
- bb_error_msg("config error '%s' in '%s'", buf, cf);
+ bb_error_msg("config error '%s' in '%s'", buf, filename);
continue;
}
url_to = strchr(host_port, '/');
if (url_to == NULL) {
- bb_error_msg("config error '%s' in '%s'", buf, cf);
+ bb_error_msg("config error '%s' in '%s'", buf, filename);
continue;
}
*url_to = '\0';
@@ -665,45 +646,44 @@ static void parse_conf(const char *path, int flag)
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
if (*p0 == '/') {
/* make full path from httpd root / current_path / config_line_path */
- cf = (flag == SUBDIR_PARSE ? path : "");
- p0 = xmalloc(strlen(cf) + (c - buf) + 2 + strlen(c));
- c[-1] = '\0';
- sprintf(p0, "/%s%s", cf, buf);
-
- /* another call bb_simplify_path */
- cf = p = p0;
+ const char *tp = (flag == SUBDIR_PARSE ? path : "");
+ p0 = xmalloc(strlen(tp) + (after_colon - buf) + 2 + strlen(after_colon));
+ after_colon[-1] = '\0';
+ sprintf(p0, "/%s%s", tp, buf);
+ /* looks like bb_simplify_path... */
+ tp = p = p0;
do {
if (*p == '/') {
- if (*cf == '/') { /* skip duplicate (or initial) slash */
+ if (*tp == '/') { /* skip duplicate (or initial) slash */
continue;
}
- if (*cf == '.') {
- if (cf[1] == '/' || cf[1] == '\0') { /* remove extra '.' */
+ if (*tp == '.') {
+ if (tp[1] == '/' || tp[1] == '\0') { /* remove extra '.' */
continue;
}
- if ((cf[1] == '.') && (cf[2] == '/' || cf[2] == '\0')) {
- ++cf;
+ if ((tp[1] == '.') && (tp[2] == '/' || tp[2] == '\0')) {
+ ++tp;
if (p > p0) {
- while (*--p != '/') /* omit previous dir */;
+ while (*--p != '/') /* omit previous dir */
+ continue;
}
continue;
}
}
}
- *++p = *cf;
- } while (*++cf);
+ *++p = *tp;
+ } while (*++tp);
- if ((p == p0) || (*p != '/')) { /* not a trailing slash */
- ++p; /* so keep last character */
+ if ((p == p0) || (*p != '/')) { /* not a trailing slash */
+ ++p; /* so keep last character */
}
*p = ':';
- strcpy(p + 1, c);
+ strcpy(p + 1, after_colon);
}
#endif
-
if (*p0 == 'I') {
- index_page = xstrdup(c);
+ index_page = xstrdup(after_colon);
continue;
}
@@ -712,38 +692,39 @@ static void parse_conf(const char *path, int flag)
|| ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
/* storing current config line */
cur = xzalloc(sizeof(Htaccess) + strlen(p0));
- cf = strcpy(cur->before_colon, p0);
+ strcpy(cur->before_colon, p0);
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
- if (*p0 == '/')
+ if (*p0 == '/') /* was malloced - see above */
free(p0);
#endif
- c = strchr(cf, ':');
- *c++ = '\0';
- cur->after_colon = c;
+ cur->after_colon = strchr(cur->before_colon, ':');
+ *cur->after_colon++ = '\0';
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_MIME_TYPES
- if (*cf == '.') {
- /* config .mime line move top for overwrite previous */
+ if (cur->before_colon[0] == '.') {
+ /* .mime line: prepend to mime_a list */
cur->next = mime_a;
mime_a = cur;
continue;
}
#endif
#if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
- if (*cf == '*' && cf[1] == '.') {
- /* config script interpreter line move top for overwrite previous */
+ if (cur->before_colon[0] == '*' && cur->before_colon[1] == '.') {
+ /* script interpreter line: prepend to script_i list */
cur->next = script_i;
script_i = cur;
continue;
}
#endif
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+//TODO: we do not test for leading "/"??
+//also, do we leak cur if BASIC_AUTH is off?
if (prev == NULL) {
/* first line */
g_auth = prev = cur;
} else {
/* sort path, if current length eq or bigger then move up */
Htaccess *prev_hti = g_auth;
- size_t l = strlen(cf);
+ size_t l = strlen(cur->before_colon);
Htaccess *hti;
for (hti = prev_hti; hti; hti = hti->next) {
@@ -1651,7 +1632,6 @@ static int checkPermIP(void)
{
Htaccess_IP *cur;
- /* This could stand some work */
for (cur = ip_a_d; cur; cur = cur->next) {
#if DEBUG
fprintf(stderr,
@@ -1668,26 +1648,23 @@ static int checkPermIP(void)
);
#endif
if ((rmt_ip & cur->mask) == cur->ip)
- return cur->allow_deny == 'A'; /* Allow/Deny */
+ return (cur->allow_deny == 'A'); /* A -> 1 */
}
- /* if unconfigured, return 1 - access from all */
- return !flg_deny_all;
+ return !flg_deny_all; /* depends on whether we saw "D:*" */
}
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
/*
- * Check the permission file for access password protected.
- *
- * If config file isn't present, everything is allowed.
- * Entries are of the form you can see example from header source
+ * Config file entries are of the form "/<path>:<user>:<passwd>".
+ * If config file has no prefix match for path, access is allowed.
*
- * path The file path.
- * request User information to validate.
+ * path The file path
+ * user_and_passwd "user:passwd" to validate
*
- * Returns 1 if request is OK.
+ * Returns 1 if user_and_passwd is OK.
*/
-static int checkPerm(const char *path, const char *request)
+static int check_user_passwd(const char *path, const char *request)
{
Htaccess *cur;
const char *p;
@@ -1786,7 +1763,6 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
char *urlcopy;
char *urlp;
char *tptr;
- int ip_allowed;
#if ENABLE_FEATURE_HTTPD_CGI
static const char request_HEAD[] ALIGN1 = "HEAD";
const char *prequest;
@@ -1797,6 +1773,10 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
#define prequest request_GET
unsigned long length = 0;
#endif
+#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
+ smallint authorized = -1;
+#endif
+ smallint ip_allowed;
char http_major_version;
#if ENABLE_FEATURE_HTTPD_PROXY
char http_minor_version;
@@ -1804,9 +1784,6 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
char *header_ptr = header_ptr;
Htaccess_Proxy *proxy_entry;
#endif
-#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
- int credentials = -1; /* if not required this is Ok */
-#endif
/* Allocation of iobuf is postponed until now
* (IOW, server process doesn't need to waste 8k) */
@@ -1946,7 +1923,7 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
/* have path1/path2 */
*tptr = '\0';
if (is_directory(urlcopy + 1, 1, &sb)) {
- /* may be having subdir config */
+ /* may have subdir config */
parse_conf(urlcopy + 1, SUBDIR_PARSE);
ip_allowed = checkPermIP();
}
@@ -2019,8 +1996,8 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
if (STRNCASECMP(iobuf, "Authorization:") == 0) {
/* We only allow Basic credentials.
- * It shows up as "Authorization: Basic <userid:password>" where
- * the userid:password is base64 encoded.
+ * It shows up as "Authorization: Basic <user>:<passwd>" where
+ * "<user>:<passwd>" is base64 encoded.
*/
tptr = skip_whitespace(iobuf + sizeof("Authorization:")-1);
if (STRNCASECMP(tptr, "Basic") != 0)
@@ -2028,9 +2005,9 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
tptr += sizeof("Basic")-1;
/* decodeBase64() skips whitespace itself */
decodeBase64(tptr);
- credentials = checkPerm(urlcopy, tptr);
+ authorized = check_user_passwd(urlcopy, tptr);
}
-#endif /* FEATURE_HTTPD_BASIC_AUTH */
+#endif
#if ENABLE_FEATURE_HTTPD_RANGES
if (STRNCASECMP(iobuf, "Range:") == 0) {
/* We know only bytes=NNN-[MMM] */
@@ -2054,13 +2031,15 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
/* We are done reading headers, disable peer timeout */
alarm(0);
- if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || ip_allowed == 0) {
+ if (strcmp(bb_basename(urlcopy), httpd_conf) == 0 || !ip_allowed) {
/* protect listing [/path]/httpd_conf or IP deny */
send_headers_and_exit(HTTP_FORBIDDEN);
}
#if ENABLE_FEATURE_HTTPD_BASIC_AUTH
- if (credentials <= 0 && checkPerm(urlcopy, ":") == 0) {
+ /* Case: no "Authorization:" was seen, but page does require passwd.
+ * Check that with dummy user:pass */
+ if ((authorized <= 0) && check_user_passwd(urlcopy, ":") == 0) {
send_headers_and_exit(HTTP_UNAUTHORIZED);
}
#endif
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