diff --git a/docs/manual/rewrite/flags.html.en b/docs/manual/rewrite/flags.html.en index 80d0759..9673094 100644 --- a/docs/manual/rewrite/flags.html.en +++ b/docs/manual/rewrite/flags.html.en @@ -85,10 +85,6 @@ of how you might use them.

B (escape backreferences)

The [B] flag instructs RewriteRule to escape non-alphanumeric characters before applying the transformation.

-

In 2.4.26 and later, you can limit the escaping to specific characters -in backreferences by listing them: [B=#?;]. Note: The space -character can be used in the list of characters to escape, but it cannot be -the last character in the list.

mod_rewrite has to unescape URLs before mapping them, so backreferences are unescaped at the time they are applied. @@ -120,6 +116,16 @@ when the backend may break if presented with an unescaped URL.

An alternative to this flag is using a RewriteCond to capture against %{THE_REQUEST} which will capture strings in the encoded form.

+ +

In 2.4.26 and later, you can limit the escaping to specific characters +in backreferences by listing them: [B=#?;]. Note: The space +character can be used in the list of characters to escape, but you must quote +the entire third argument of RewriteRule +and the space must not be the last character in the list.

+ +
# Escape spaces and question marks.
+RewriteRule "^search/(.*)$" "/search.php?term=$1" "[B= ?]"
+
top

BNP|backrefnoplus (don't escape space to +)

diff --git a/modules/http2/mod_proxy_http2.c b/modules/http2/mod_proxy_http2.c index a7e0dcd..9aa1f89 100644 --- a/modules/http2/mod_proxy_http2.c +++ b/modules/http2/mod_proxy_http2.c @@ -178,6 +178,16 @@ static int proxy_http2_canon(request_rec *r, char *url) path = ap_proxy_canonenc(r->pool, url, (int)strlen(url), enc_path, 0, r->proxyreq); search = r->args; + if (search && *(ap_scan_vchar_obstext(search))) { + /* + * We have a raw control character or a ' ' in r->args. + * Correct encoding was missed. + */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10412) + "To be forwarded query string contains control " + "characters or spaces"); + return HTTP_FORBIDDEN; + } } break; case PROXYREQ_PROXY: diff --git a/modules/mappers/mod_rewrite.c b/modules/mappers/mod_rewrite.c index 38dbb24..7e2b452 100644 --- a/modules/mappers/mod_rewrite.c +++ b/modules/mappers/mod_rewrite.c @@ -168,6 +168,7 @@ static const char* really_last_key = "rewrite_really_last"; #define RULEFLAG_END (1<<17) #define RULEFLAG_ESCAPENOPLUS (1<<18) #define RULEFLAG_QSLAST (1<<19) +#define RULEFLAG_QSNONE (1<<20) /* programattic only */ /* return code of the rewrite rule * the result may be escaped - or not @@ -761,15 +762,24 @@ static char *escape_absolute_uri(apr_pool_t *p, char *uri, unsigned scheme) ap_escape_uri(p, cp), NULL); } + /* * split out a QUERY_STRING part from * the current URI string */ -static void splitout_queryargs(request_rec *r, int qsappend, int qsdiscard, - int qslast) +static void splitout_queryargs(request_rec *r, int flags) { char *q; int split; + int qsappend = flags & RULEFLAG_QSAPPEND; + int qsdiscard = flags & RULEFLAG_QSDISCARD; + int qslast = flags & RULEFLAG_QSLAST; + + if (flags & RULEFLAG_QSNONE) { + rewritelog((r, 2, NULL, "discarding query string, no parse from substitution")); + r->args = NULL; + return; + } /* don't touch, unless it's a scheme for which a query string makes sense. * See RFC 1738 and RFC 2368. @@ -794,7 +804,7 @@ static void splitout_queryargs(request_rec *r, int qsappend, int qsdiscard, olduri = apr_pstrdup(r->pool, r->filename); *q++ = '\0'; if (qsappend) { - if (*q) { + if (*q) { r->args = apr_pstrcat(r->pool, q, "&" , r->args, NULL); } } @@ -802,9 +812,9 @@ static void splitout_queryargs(request_rec *r, int qsappend, int qsdiscard, r->args = apr_pstrdup(r->pool, q); } - if (r->args) { + if (r->args) { len = strlen(r->args); - + if (!len) { r->args = NULL; } @@ -2733,7 +2743,7 @@ static apr_status_t rewritelock_remove(void *data) * XXX: what an inclined parser. Seems we have to leave it so * for backwards compat. *sigh* */ -static int parseargline(char *str, char **a1, char **a2, char **a3) +static int parseargline(char *str, char **a1, char **a2, char **a2_end, char **a3) { char quote; @@ -2784,8 +2794,10 @@ static int parseargline(char *str, char **a1, char **a2, char **a3) if (!*str) { *a3 = NULL; /* 3rd argument is optional */ + *a2_end = str; return 0; } + *a2_end = str; *str++ = '\0'; while (apr_isspace(*str)) { @@ -3323,7 +3335,7 @@ static const char *cmd_rewritecond(cmd_parms *cmd, void *in_dconf, rewrite_server_conf *sconf; rewritecond_entry *newcond; ap_regex_t *regexp; - char *a1 = NULL, *a2 = NULL, *a3 = NULL; + char *a1 = NULL, *a2 = NULL, *a2_end, *a3 = NULL; const char *err; sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module); @@ -3341,7 +3353,7 @@ static const char *cmd_rewritecond(cmd_parms *cmd, void *in_dconf, * of the argument line. So we can use a1 .. a3 without * copying them again. */ - if (parseargline(str, &a1, &a2, &a3)) { + if (parseargline(str, &a1, &a2, &a2_end, &a3)) { return apr_pstrcat(cmd->pool, "RewriteCond: bad argument line '", str, "'", NULL); } @@ -3749,7 +3761,7 @@ static const char *cmd_rewriterule(cmd_parms *cmd, void *in_dconf, rewrite_server_conf *sconf; rewriterule_entry *newrule; ap_regex_t *regexp; - char *a1 = NULL, *a2 = NULL, *a3 = NULL; + char *a1 = NULL, *a2 = NULL, *a2_end, *a3 = NULL; const char *err; sconf = ap_get_module_config(cmd->server->module_config, &rewrite_module); @@ -3763,7 +3775,7 @@ static const char *cmd_rewriterule(cmd_parms *cmd, void *in_dconf, } /* parse the argument line ourself */ - if (parseargline(str, &a1, &a2, &a3)) { + if (parseargline(str, &a1, &a2, &a2_end, &a3)) { return apr_pstrcat(cmd->pool, "RewriteRule: bad argument line '", str, "'", NULL); } @@ -3810,6 +3822,17 @@ static const char *cmd_rewriterule(cmd_parms *cmd, void *in_dconf, newrule->flags |= RULEFLAG_NOSUB; } + if (*(a2_end-1) == '?') { + /* a literal ? at the end of the unsubstituted rewrite rule */ + newrule->flags |= RULEFLAG_QSNONE; + *(a2_end-1) = '\0'; /* trailing ? has done its job */ + } + else if (newrule->flags & RULEFLAG_QSDISCARD) { + if (NULL == ap_strchr(newrule->output, '?')) { + newrule->flags |= RULEFLAG_QSNONE; + } + } + /* now, if the server or per-dir config holds an * array of RewriteCond entries, we take it for us * and clear the array @@ -4215,9 +4238,7 @@ static int apply_rewrite_rule(rewriterule_entry *p, rewrite_ctx *ctx) r->path_info = NULL; } - splitout_queryargs(r, p->flags & RULEFLAG_QSAPPEND, - p->flags & RULEFLAG_QSDISCARD, - p->flags & RULEFLAG_QSLAST); + splitout_queryargs(r, p->flags); /* Add the previously stripped per-directory location prefix, unless * (1) it's an absolute URL path and @@ -4699,6 +4720,17 @@ static int hook_uri2file(request_rec *r) unsigned skip; apr_size_t flen; + if (r->args && *(ap_scan_vchar_obstext(r->args))) { + /* + * We have a raw control character or a ' ' in r->args. + * Correct encoding was missed. + */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10410) + "Rewritten query string contains control " + "characters or spaces"); + return HTTP_FORBIDDEN; + } + if (ACTION_STATUS == rulestatus) { int n = r->status; @@ -4983,6 +5015,17 @@ static int hook_fixup(request_rec *r) if (rulestatus) { unsigned skip; + if (r->args && *(ap_scan_vchar_obstext(r->args))) { + /* + * We have a raw control character or a ' ' in r->args. + * Correct encoding was missed. + */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10411) + "Rewritten query string contains control " + "characters or spaces"); + return HTTP_FORBIDDEN; + } + if (ACTION_STATUS == rulestatus) { int n = r->status; diff --git a/modules/proxy/mod_proxy_ajp.c b/modules/proxy/mod_proxy_ajp.c index eb550e5..8b8d09e 100644 --- a/modules/proxy/mod_proxy_ajp.c +++ b/modules/proxy/mod_proxy_ajp.c @@ -69,6 +69,16 @@ static int proxy_ajp_canon(request_rec *r, char *url) path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, 0, r->proxyreq); search = r->args; + if (search && *(ap_scan_vchar_obstext(search))) { + /* + * We have a raw control character or a ' ' in r->args. + * Correct encoding was missed. + */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10406) + "To be forwarded query string contains control " + "characters or spaces"); + return HTTP_FORBIDDEN; + } } if (path == NULL) return HTTP_BAD_REQUEST; diff --git a/modules/proxy/mod_proxy_balancer.c b/modules/proxy/mod_proxy_balancer.c index c6c7e89..9a5cb08 100644 --- a/modules/proxy/mod_proxy_balancer.c +++ b/modules/proxy/mod_proxy_balancer.c @@ -106,6 +106,16 @@ static int proxy_balancer_canon(request_rec *r, char *url) path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, 0, r->proxyreq); search = r->args; + if (search && *(ap_scan_vchar_obstext(search))) { + /* + * We have a raw control character or a ' ' in r->args. + * Correct encoding was missed. + */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10407) + "To be forwarded query string contains control " + "characters or spaces"); + return HTTP_FORBIDDEN; + } } if (path == NULL) return HTTP_BAD_REQUEST; diff --git a/modules/proxy/mod_proxy_http.c b/modules/proxy/mod_proxy_http.c index a33b57b..f528d94 100644 --- a/modules/proxy/mod_proxy_http.c +++ b/modules/proxy/mod_proxy_http.c @@ -90,6 +90,16 @@ static int proxy_http_canon(request_rec *r, char *url) path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, 0, r->proxyreq); search = r->args; + if (search && *(ap_scan_vchar_obstext(search))) { + /* + * We have a raw control character or a ' ' in r->args. + * Correct encoding was missed. + */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10408) + "To be forwarded query string contains control " + "characters or spaces"); + return HTTP_FORBIDDEN; + } } break; case PROXYREQ_PROXY: diff --git a/modules/proxy/mod_proxy_wstunnel.c b/modules/proxy/mod_proxy_wstunnel.c index 9dda010..05f5d1e 100644 --- a/modules/proxy/mod_proxy_wstunnel.c +++ b/modules/proxy/mod_proxy_wstunnel.c @@ -73,6 +73,16 @@ static int proxy_wstunnel_canon(request_rec *r, char *url) path = ap_proxy_canonenc(r->pool, url, strlen(url), enc_path, 0, r->proxyreq); search = r->args; + if (search && *(ap_scan_vchar_obstext(search))) { + /* + * We have a raw control character or a ' ' in r->args. + * Correct encoding was missed. + */ + ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, r, APLOGNO(10409) + "To be forwarded query string contains control " + "characters or spaces"); + return HTTP_FORBIDDEN; + } } if (path == NULL) return HTTP_BAD_REQUEST;