* modules/metadata/mod_remoteip.c (remoteip_process_v2_header,
remoteip_input_filter): Add sanity checks.
Submitted by: jorton, Daniel McCarney <cpu letsencrypt.org>
@@ -987,15 +987,13 @@ static remoteip_parse_status_t remoteip_process_v2_header(conn_rec *c,
return HDR_ERROR;
#endif
default:
- /* unsupported protocol, keep local connection address */
- return HDR_DONE;
+ /* unsupported protocol */
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(10183)
+ "RemoteIPProxyProtocol: unsupported protocol %.2hx",
+ (unsigned short)hdr->v2.fam);
+ return HDR_ERROR;
}
break; /* we got a sockaddr now */
-
- case 0x00: /* LOCAL command */
- /* keep local connection address for LOCAL */
- return HDR_DONE;
-
default:
/* not a supported command */
ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, c, APLOGNO(03507)
@@ -1087,11 +1085,24 @@ static apr_status_t remoteip_input_filter(ap_filter_t *f,
/* try to read a header's worth of data */
while (!ctx->done) {
if (APR_BRIGADE_EMPTY(ctx->bb)) {
- ret = ap_get_brigade(f->next, ctx->bb, ctx->mode, block,
- ctx->need - ctx->rcvd);
+ apr_off_t got, want = ctx->need - ctx->rcvd;
+
+ ret = ap_get_brigade(f->next, ctx->bb, ctx->mode, block, want);
if (ret != APR_SUCCESS) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, ret, f->c, APLOGNO(10184)
+ "failed reading input");
return ret;
}
+
+ ret = apr_brigade_length(ctx->bb, 1, &got);
+ if (ret || got > want) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, ret, f->c, APLOGNO(10185)
+ "RemoteIPProxyProtocol header too long, "
+ "got %" APR_OFF_T_FMT " expected %" APR_OFF_T_FMT,
+ got, want);
+ f->c->aborted = 1;
+ return APR_ECONNABORTED;
+ }
}
if (APR_BRIGADE_EMPTY(ctx->bb)) {
return block == APR_NONBLOCK_READ ? APR_SUCCESS : APR_EOF;
@@ -1139,6 +1150,13 @@ static apr_status_t remoteip_input_filter(ap_filter_t *f,
if (ctx->rcvd >= MIN_V2_HDR_LEN) {
ctx->need = MIN_V2_HDR_LEN +
remoteip_get_v2_len((proxy_header *) ctx->header);
+ if (ctx->need > sizeof(proxy_v2)) {
+ ap_log_cerror(APLOG_MARK, APLOG_ERR, 0, f->c, APLOGNO(10186)
+ "RemoteIPProxyProtocol protocol header length too long");
+ f->c->aborted = 1;
+ apr_brigade_destroy(ctx->bb);
+ return APR_ECONNABORTED;
+ }
}
if (ctx->rcvd >= ctx->need) {
psts = remoteip_process_v2_header(f->c, conn_conf,
