File apache2-CVE-2016-8743.patch of Package apache2.13990

Index: httpd-2.4.23/include/http_core.h
===================================================================
--- httpd-2.4.23.orig/include/http_core.h	2017-02-24 10:48:06.670800444 +0100
+++ httpd-2.4.23/include/http_core.h	2017-02-24 10:50:22.617074938 +0100
@@ -736,6 +736,22 @@ typedef struct {
 
     apr_array_header_t *protocols;
     int protocols_honor_order;
+
+#define AP_HTTP09_UNSET   0
+#define AP_HTTP09_ENABLE  1
+#define AP_HTTP09_DISABLE 2
+    char http09_enable;
+
+#define AP_HTTP_CONFORMANCE_UNSET     0
+#define AP_HTTP_CONFORMANCE_UNSAFE    1
+#define AP_HTTP_CONFORMANCE_STRICT    2
+    char http_conformance;
+
+#define AP_HTTP_METHODS_UNSET         0
+#define AP_HTTP_METHODS_LENIENT       1
+#define AP_HTTP_METHODS_REGISTERED    2
+    char http_methods;
+
 } core_server_config;
 
 /* for AddOutputFiltersByType in core.c */
Index: httpd-2.4.23/include/http_protocol.h
===================================================================
--- httpd-2.4.23.orig/include/http_protocol.h	2016-03-12 17:52:57.000000000 +0100
+++ httpd-2.4.23/include/http_protocol.h	2017-02-24 10:48:06.670800444 +0100
@@ -582,17 +582,22 @@ AP_DECLARE(int) ap_get_basic_auth_pw(req
  */
 AP_CORE_DECLARE(void) ap_parse_uri(request_rec *r, const char *uri);
 
+#define AP_GETLINE_FOLD 1 /* Whether to merge continuation lines */
+#define AP_GETLINE_CRLF 2 /*Whether line ends must be in the form CR LF */
+
 /**
  * Get the next line of input for the request
  * @param s The buffer into which to read the line
  * @param n The size of the buffer
  * @param r The request
- * @param fold Whether to merge continuation lines
+ * @param flags Bit flag of multiple parsing options
+ *              AP_GETLINE_FOLD Whether to merge continuation lines
+ *              AP_GETLINE_CRLF Whether line ends must be in the form CR LF
  * @return The length of the line, if successful
  *         n, if the line is too big to fit in the buffer
  *         -1 for miscellaneous errors
  */
-AP_DECLARE(int) ap_getline(char *s, int n, request_rec *r, int fold);
+AP_DECLARE(int) ap_getline(char *s, int n, request_rec *r, int flags);
 
 /**
  * Get the next line of input for the request
@@ -610,7 +615,9 @@ AP_DECLARE(int) ap_getline(char *s, int
  * @param n The size of the buffer
  * @param read The length of the line.
  * @param r The request
- * @param fold Whether to merge continuation lines
+ * @param flags Bit flag of multiple parsing options
+ *              AP_GETLINE_FOLD Whether to merge continuation lines
+ *              AP_GETLINE_CRLF Whether line ends must be in the form CR LF
  * @param bb Working brigade to use when reading buckets
  * @return APR_SUCCESS, if successful
  *         APR_ENOSPC, if the line is too big to fit in the buffer
@@ -619,7 +626,7 @@ AP_DECLARE(int) ap_getline(char *s, int
 #if APR_CHARSET_EBCDIC
 AP_DECLARE(apr_status_t) ap_rgetline(char **s, apr_size_t n,
                                      apr_size_t *read,
-                                     request_rec *r, int fold,
+                                     request_rec *r, int flags,
                                      apr_bucket_brigade *bb);
 #else /* ASCII box */
 #define ap_rgetline(s, n, read, r, fold, bb) \
@@ -629,7 +636,7 @@ AP_DECLARE(apr_status_t) ap_rgetline(cha
 /** @see ap_rgetline */
 AP_DECLARE(apr_status_t) ap_rgetline_core(char **s, apr_size_t n,
                                           apr_size_t *read,
-                                          request_rec *r, int fold,
+                                          request_rec *r, int flags,
                                           apr_bucket_brigade *bb);
 
 /**
Index: httpd-2.4.23/include/httpd.h
===================================================================
--- httpd-2.4.23.orig/include/httpd.h	2017-02-24 10:48:06.650800109 +0100
+++ httpd-2.4.23/include/httpd.h	2017-02-24 10:48:06.670800444 +0100
@@ -1585,6 +1585,28 @@ AP_DECLARE(int) ap_find_etag_weak(apr_po
  */
 AP_DECLARE(int) ap_find_etag_strong(apr_pool_t *p, const char *line, const char *tok);
 
+/* Scan a string for field content chars, as defined by RFC7230 section 3.2
+ * including VCHAR/obs-text, as well as HT and SP
+ * @param ptr The string to scan
+ * @return A pointer to the first (non-HT) ASCII ctrl character.
+ * @note lws and trailing whitespace are scanned, the caller is responsible
+ * for trimming leading and trailing whitespace
+ */
+AP_DECLARE(const char *) ap_scan_http_field_content(const char *ptr);
+
+/* Scan a string for token characters, as defined by RFC7230 section 3.2.6 
+ * @param ptr The string to scan
+ * @return A pointer to the first non-token character.
+ */
+AP_DECLARE(const char *) ap_scan_http_token(const char *ptr);
+
+/* Scan a string for visible ASCII (0x21-0x7E) or obstext (0x80+)
+ * and return a pointer to the first SP/CTL/NUL character encountered.
+ * @param ptr The string to scan
+ * @return A pointer to the first SP/CTL character.
+ */
+AP_DECLARE(const char *) ap_scan_vchar_obstext(const char *ptr);
+
 /**
  * Retrieve an array of tokens in the format "1#token" defined in RFC2616. Only
  * accepts ',' as a delimiter, does not accept quoted strings, and errors on
Index: httpd-2.4.23/modules/http/http_filters.c
===================================================================
--- httpd-2.4.23.orig/modules/http/http_filters.c	2017-02-24 10:48:06.654800176 +0100
+++ httpd-2.4.23/modules/http/http_filters.c	2017-02-24 10:48:06.674800511 +0100
@@ -126,14 +126,15 @@ static apr_status_t bail_out_on_error(ht
 
 /**
  * Parse a chunk line with optional extension, detect overflow.
- * There are two error cases:
- *  1) If the conversion would require too many bits, APR_EGENERAL is returned.
- *  2) If the conversion used the correct number of bits, but an overflow
+ * There are several error cases:
+ *  1) If the chunk link is misformatted, APR_EINVAL is returned.
+ *  2) If the conversion would require too many bits, APR_EGENERAL is returned.
+ *  3) If the conversion used the correct number of bits, but an overflow
  *     caused only the sign bit to flip, then APR_ENOSPC is returned.
- * In general, any negative number can be considered an overflow error.
+ * A negative chunk length always indicates an overflow error.
  */
 static apr_status_t parse_chunk_size(http_ctx_t *ctx, const char *buffer,
-                                     apr_size_t len, int linelimit)
+                                     apr_size_t len, int linelimit, int strict)
 {
     apr_size_t i = 0;
 
@@ -146,6 +147,12 @@ static apr_status_t parse_chunk_size(htt
         if (ctx->state == BODY_CHUNK_END
                 || ctx->state == BODY_CHUNK_END_LF) {
             if (c == LF) {
+                if (strict && (ctx->state != BODY_CHUNK_END_LF)) {
+                    /*
+                     * CR missing before LF.
+                     */
+                    return APR_EINVAL;
+                }
                 ctx->state = BODY_CHUNK;
             }
             else if (c == CR && ctx->state == BODY_CHUNK_END) {
@@ -153,7 +160,7 @@ static apr_status_t parse_chunk_size(htt
             }
             else {
                 /*
-                 * LF expected.
+                 * CRLF expected.
                  */
                 return APR_EINVAL;
             }
@@ -180,6 +187,12 @@ static apr_status_t parse_chunk_size(htt
         }
 
         if (c == LF) {
+            if (strict && (ctx->state != BODY_CHUNK_LF)) {
+                /*
+                 * CR missing before LF.
+                 */
+                return APR_EINVAL;
+            }
             if (ctx->remaining) {
                 ctx->state = BODY_CHUNK_DATA;
             }
@@ -201,14 +214,17 @@ static apr_status_t parse_chunk_size(htt
         }
         else if (ctx->state == BODY_CHUNK_EXT) {
             /*
-             * Control chars (but tabs) are invalid.
+             * Control chars (excluding tabs) are invalid.
+             * TODO: more precisely limit input
              */
             if (c != '\t' && apr_iscntrl(c)) {
                 return APR_EINVAL;
             }
         }
         else if (c == ' ' || c == '\t') {
-            /* Be lenient up to 10 BWS (term from rfc7230 - 3.2.3).
+            /* Be lenient up to 10 implied *LWS, a legacy of RFC 2616,
+             * and noted as errata to RFC7230;
+             * https://www.rfc-editor.org/errata_search.php?rfc=7230&eid=4667
              */
             ctx->state = BODY_CHUNK_CR;
             if (++ctx->chunk_bws > 10) {
@@ -324,7 +340,10 @@ apr_status_t ap_http_filter(ap_filter_t
                             ap_input_mode_t mode, apr_read_type_e block,
                             apr_off_t readbytes)
 {
-    core_server_config *conf;
+    core_server_config *conf =
+        (core_server_config *) ap_get_module_config(f->r->server->module_config,
+                                                    &core_module);
+    int strict = (conf->http_conformance != AP_HTTP_CONFORMANCE_UNSAFE);
     apr_bucket *e;
     http_ctx_t *ctx = f->ctx;
     apr_status_t rv;
@@ -332,9 +351,6 @@ apr_status_t ap_http_filter(ap_filter_t
     apr_bucket_brigade *bb;
     int again;
 
-    conf = (core_server_config *)
-        ap_get_module_config(f->r->server->module_config, &core_module);
-
     /* just get out of the way of things we don't want. */
     if (mode != AP_MODE_READBYTES && mode != AP_MODE_GETLINE) {
         return ap_get_brigade(f->next, b, mode, block, readbytes);
@@ -526,7 +542,7 @@ apr_status_t ap_http_filter(ap_filter_t
                     if (rv == APR_SUCCESS) {
                         parsing = 1;
                         rv = parse_chunk_size(ctx, buffer, len,
-                                f->r->server->limit_req_fieldsize);
+                                f->r->server->limit_req_fieldsize, strict);
                     }
                     if (rv != APR_SUCCESS) {
                         ap_log_rerror(APLOG_MARK, APLOG_INFO, rv, f->r, APLOGNO(01590)
@@ -668,14 +684,83 @@ apr_status_t ap_http_filter(ap_filter_t
     return APR_SUCCESS;
 }
 
+struct check_header_ctx {
+    request_rec *r;
+    int strict;
+};
+
+/* check a single header, to be used with apr_table_do() */
+static int check_header(void *arg, const char *name, const char *val)
+{
+    struct check_header_ctx *ctx = arg;
+    const char *test;
+
+    if (name[0] == '\0') {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, ctx->r, APLOGNO(02428)
+                      "Empty response header name, aborting request");
+        return 0;
+    }
+
+    if (ctx->strict) { 
+        test = ap_scan_http_token(name);
+    }
+    else {
+        test = ap_scan_vchar_obstext(name);
+    }
+    if (*test) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, ctx->r, APLOGNO(02429)
+                      "Response header name '%s' contains invalid "
+                      "characters, aborting request",
+                      name);
+        return 0;
+    }
+
+    if (ctx->strict) { 
+        test = ap_scan_http_field_content(val);
+    }
+    else {
+        /* Simply terminate scanning on a CTL char, allowing whitespace */
+        test = val;
+        do {
+            while (*test == ' ' || *test == '\t') test++;
+            test = ap_scan_vchar_obstext(test);
+        } while (*test == ' ' || *test == '\t');
+    }
+    if (*test) {
+        ap_log_rerror(APLOG_MARK, APLOG_ERR, 0, ctx->r, APLOGNO(02430)
+                      "Response header '%s' value of '%s' contains invalid "
+                      "characters, aborting request",
+                      name, val);
+        return 0;
+    }
+    return 1;
+}
+
+/**
+ * Check headers for HTTP conformance
+ * @return 1 if ok, 0 if bad
+ */
+static APR_INLINE int check_headers(request_rec *r)
+{
+    struct check_header_ctx ctx;
+    core_server_config *conf =
+            ap_get_core_module_config(r->server->module_config);
+
+    ctx.r = r;
+    ctx.strict = (conf->http_conformance != AP_HTTP_CONFORMANCE_UNSAFE);
+    if (!apr_table_do(check_header, &ctx, r->headers_out, NULL))
+        return 0; /* problem has been logged by check_header() */
+
+    return 1;
+}
+
 typedef struct header_struct {
     apr_pool_t *pool;
     apr_bucket_brigade *bb;
 } header_struct;
 
 /* Send a single HTTP header field to the client.  Note that this function
- * is used in calls to table_do(), so their interfaces are co-dependent.
- * In other words, don't change this one without checking table_do in alloc.c.
+ * is used in calls to apr_table_do(), so don't change its interface.
  * It returns true unless there was a write error of some kind.
  */
 static int form_header_field(header_struct *h,
@@ -1231,6 +1316,11 @@ AP_CORE_DECLARE_NONSTD(apr_status_t) ap_
                                            r->headers_out);
     }
 
+    if (!check_headers(r)) {
+        ap_die(HTTP_INTERNAL_SERVER_ERROR, r);
+        return AP_FILTER_ERROR;
+    }
+
     /*
      * Remove the 'Vary' header field if the client can't handle it.
      * Since this will have nasty effects on HTTP/1.1 caches, force
Index: httpd-2.4.23/server/core.c
===================================================================
--- httpd-2.4.23.orig/server/core.c	2017-02-24 10:48:06.654800176 +0100
+++ httpd-2.4.23/server/core.c	2017-02-24 10:48:06.674800511 +0100
@@ -521,6 +521,15 @@ static void *merge_core_server_configs(a
     if (virt->http_expect_strict != AP_HTTP_EXPECT_STRICT_UNSET)
         conf->http_expect_strict = virt->http_expect_strict;
 
+    if (virt->http09_enable != AP_HTTP09_UNSET)
+        conf->http09_enable = virt->http09_enable;
+
+    if (virt->http_conformance != AP_HTTP_CONFORMANCE_UNSET)
+        conf->http_conformance = virt->http_conformance;
+
+    if (virt->http_methods != AP_HTTP_METHODS_UNSET)
+        conf->http_methods = virt->http_methods;
+
     /* no action for virt->accf_map, not allowed per-vhost */
 
     if (virt->protocol)
@@ -3923,6 +3932,57 @@ static const char *set_expect_strict(cmd
     return NULL;
 }
 
+static const char *set_http_protocol_options(cmd_parms *cmd, void *dummy,
+                                             const char *arg)
+{
+    core_server_config *conf =
+        ap_get_core_module_config(cmd->server->module_config);
+
+    if (strcasecmp(arg, "allow0.9") == 0)
+        conf->http09_enable |= AP_HTTP09_ENABLE;
+    else if (strcasecmp(arg, "require1.0") == 0)
+        conf->http09_enable |= AP_HTTP09_DISABLE;
+    else if (strcasecmp(arg, "strict") == 0)
+        conf->http_conformance |= AP_HTTP_CONFORMANCE_STRICT;
+    else if (strcasecmp(arg, "unsafe") == 0)
+        conf->http_conformance |= AP_HTTP_CONFORMANCE_UNSAFE;
+    else if (strcasecmp(arg, "registeredmethods") == 0)
+        conf->http_methods |= AP_HTTP_METHODS_REGISTERED;
+    else if (strcasecmp(arg, "lenientmethods") == 0)
+        conf->http_methods |= AP_HTTP_METHODS_LENIENT;
+    else
+        return "HttpProtocolOptions accepts "
+               "'Unsafe' or 'Strict' (default), "
+               "'RegisteredMethods' or 'LenientMethods' (default), and "
+               "'Require1.0' or 'Allow0.9' (default)";
+
+    if ((conf->http09_enable & AP_HTTP09_ENABLE)
+            && (conf->http09_enable & AP_HTTP09_DISABLE))
+        return "HttpProtocolOptions 'Allow0.9' and 'Require1.0'"
+               " are mutually exclusive";
+
+    if ((conf->http_conformance & AP_HTTP_CONFORMANCE_STRICT)
+            && (conf->http_conformance & AP_HTTP_CONFORMANCE_UNSAFE))
+        return "HttpProtocolOptions 'Strict' and 'Unsafe'"
+               " are mutually exclusive";
+
+    if ((conf->http_methods & AP_HTTP_METHODS_REGISTERED)
+            && (conf->http_methods & AP_HTTP_METHODS_LENIENT))
+        return "HttpProtocolOptions 'RegisteredMethods' and 'LenientMethods'"
+               " are mutually exclusive";
+
+    return NULL;
+}
+
+static const char *set_http_method(cmd_parms *cmd, void *conf, const char *arg)
+{
+    const char *err = ap_check_cmd_context(cmd, GLOBAL_ONLY);
+    if (err != NULL)
+        return err;
+    ap_method_register(cmd->pool, arg);
+    return NULL;
+}
+
 static apr_hash_t *errorlog_hash;
 
 static int log_constant_item(const ap_errorlog_info *info, const char *arg,
@@ -4451,6 +4511,12 @@ AP_INIT_ITERATE("Protocols", set_protoco
 AP_INIT_TAKE1("ProtocolsHonorOrder", set_protocols_honor_order, NULL, RSRC_CONF,
               "'off' (default) or 'on' to respect given order of protocols, "
               "by default the client specified order determines selection"),
+AP_INIT_ITERATE("HttpProtocolOptions", set_http_protocol_options, NULL, RSRC_CONF,
+                "'Allow0.9' or 'Require1.0' (default); "
+                "'RegisteredMethods' or 'LenientMethods' (default); "
+                "'Unsafe' or 'Strict' (default). Sets HTTP acceptance rules"),
+AP_INIT_ITERATE("RegisterHttpMethod", set_http_method, NULL, RSRC_CONF,
+                "Registers non-standard HTTP methods"),
 { NULL }
 };
 
Index: httpd-2.4.23/server/gen_test_char.c
===================================================================
--- httpd-2.4.23.orig/server/gen_test_char.c	2013-01-28 14:13:18.000000000 +0100
+++ httpd-2.4.23/server/gen_test_char.c	2017-02-24 10:48:06.674800511 +0100
@@ -16,11 +16,11 @@
 
 #ifdef CROSS_COMPILE
 
+#include <ctype.h>
 #define apr_isalnum(c) (isalnum(((unsigned char)(c))))
 #define apr_isalpha(c) (isalpha(((unsigned char)(c))))
 #define apr_iscntrl(c) (iscntrl(((unsigned char)(c))))
 #define apr_isprint(c) (isprint(((unsigned char)(c))))
-#include <ctype.h>
 #define APR_HAVE_STDIO_H 1
 #define APR_HAVE_STRING_H 1
 
@@ -52,11 +52,13 @@
 #define T_ESCAPE_LOGITEM      (0x10)
 #define T_ESCAPE_FORENSIC     (0x20)
 #define T_ESCAPE_URLENCODED   (0x40)
+#define T_HTTP_CTRLS          (0x80)
+#define T_VCHAR_OBSTEXT      (0x100)
 
 int main(int argc, char *argv[])
 {
     unsigned c;
-    unsigned char flags;
+    unsigned short flags;
 
     printf("/* this file is automatically generated by gen_test_char, "
            "do not edit */\n"
@@ -67,19 +69,23 @@ int main(int argc, char *argv[])
            "#define T_ESCAPE_LOGITEM       (%u)\n"
            "#define T_ESCAPE_FORENSIC      (%u)\n"
            "#define T_ESCAPE_URLENCODED    (%u)\n"
+           "#define T_HTTP_CTRLS           (%u)\n"
+           "#define T_VCHAR_OBSTEXT        (%u)\n"
            "\n"
-           "static const unsigned char test_char_table[256] = {",
+           "static const unsigned short test_char_table[256] = {",
            T_ESCAPE_SHELL_CMD,
            T_ESCAPE_PATH_SEGMENT,
            T_OS_ESCAPE_PATH,
            T_HTTP_TOKEN_STOP,
            T_ESCAPE_LOGITEM,
            T_ESCAPE_FORENSIC,
-           T_ESCAPE_URLENCODED);
+           T_ESCAPE_URLENCODED,
+           T_HTTP_CTRLS,
+           T_VCHAR_OBSTEXT);
 
     for (c = 0; c < 256; ++c) {
         flags = 0;
-        if (c % 20 == 0)
+        if (c % 8 == 0)
             printf("\n    ");
 
         /* escape_shell_cmd */
@@ -107,7 +113,7 @@ int main(int argc, char *argv[])
             flags |= T_ESCAPE_PATH_SEGMENT;
         }
 
-        if (!apr_isalnum(c) && !strchr("$-_.+!*'(),:@&=/~", c)) {
+        if (!apr_isalnum(c) && !strchr("$-_.+!*'(),:;@&=/~", c)) {
             flags |= T_OS_ESCAPE_PATH;
         }
 
@@ -115,11 +121,32 @@ int main(int argc, char *argv[])
             flags |= T_ESCAPE_URLENCODED;
         }
 
-        /* these are the "tspecials" (RFC2068) or "separators" (RFC2616) */
-        if (c && (apr_iscntrl(c) || strchr(" \t()<>@,;:\\\"/[]?={}", c))) {
+        /* Stop for any non-'token' character, including ctrls, obs-text,
+         * and "tspecials" (RFC2068) a.k.a. "separators" (RFC2616), which
+         * is easer to express as characters remaining in the ASCII token set
+         */
+        if (!c || !(apr_isalnum(c) || strchr("!#$%&'*+-.^_`|~", c))) {
             flags |= T_HTTP_TOKEN_STOP;
         }
 
+        /* Catch CTRLs other than VCHAR, HT and SP, and obs-text (RFC7230 3.2)
+         * This includes only the C0 plane, not C1 (which is obs-text itself.)
+         * XXX: We should verify that all ASCII C0 ctrls/DEL corresponding to
+         * the current EBCDIC translation are captured, and ASCII C1 ctrls
+         * corresponding are all permitted (as they fall under obs-text rule)
+         */
+        if (!c || (apr_iscntrl(c) && c != '\t')) {
+            flags |= T_HTTP_CTRLS;
+        }
+
+        /* From RFC3986, the specific sets of gen-delims, sub-delims (2.2),
+         * and unreserved (2.3) that are possible somewhere within a URI.
+         * Spec requires all others to be %XX encoded, including obs-text.
+         */
+        if (c && !apr_iscntrl(c) && c != ' ') {
+            flags |= T_VCHAR_OBSTEXT;
+        }
+
         /* For logging, escape all control characters,
          * double quotes (because they delimit the request in the log file)
          * backslashes (because we use backslash for escaping)
@@ -137,7 +164,7 @@ int main(int argc, char *argv[])
             flags |= T_ESCAPE_FORENSIC;
         }
 
-        printf("%u%c", flags, (c < 255) ? ',' : ' ');
+        printf("0x%03x%c", flags, (c < 255) ? ',' : ' ');
     }
 
     printf("\n};\n");
Index: httpd-2.4.23/server/protocol.c
===================================================================
--- httpd-2.4.23.orig/server/protocol.c	2017-02-24 10:48:06.654800176 +0100
+++ httpd-2.4.23/server/protocol.c	2017-02-24 10:48:06.674800511 +0100
@@ -191,6 +191,10 @@ AP_DECLARE(apr_time_t) ap_rationalize_mt
 /* Get a line of protocol input, including any continuation lines
  * caused by MIME folding (or broken clients) if fold != 0, and place it
  * in the buffer s, of size n bytes, without the ending newline.
+ * 
+ * Pulls from r->proto_input_filters instead of r->input_filters for
+ * stricter protocol adherence and better input filter behavior during
+ * chunked trailer processing (for http).
  *
  * If s is NULL, ap_rgetline_core will allocate necessary memory from r->pool.
  *
@@ -200,7 +204,7 @@ AP_DECLARE(apr_time_t) ap_rationalize_mt
  * APR_ENOSPC is returned if there is not enough buffer space.
  * Other errors may be returned on other errors.
  *
- * The LF is *not* returned in the buffer.  Therefore, a *read of 0
+ * The [CR]LF are *not* returned in the buffer.  Therefore, a *read of 0
  * indicates that an empty line was read.
  *
  * Notes: Because the buffer uses 1 char for NUL, the most we can return is
@@ -211,13 +215,15 @@ AP_DECLARE(apr_time_t) ap_rationalize_mt
  */
 AP_DECLARE(apr_status_t) ap_rgetline_core(char **s, apr_size_t n,
                                           apr_size_t *read, request_rec *r,
-                                          int fold, apr_bucket_brigade *bb)
+                                          int flags, apr_bucket_brigade *bb)
 {
     apr_status_t rv;
     apr_bucket *e;
     apr_size_t bytes_handled = 0, current_alloc = 0;
     char *pos, *last_char = *s;
     int do_alloc = (*s == NULL), saw_eos = 0;
+    int fold = flags & AP_GETLINE_FOLD;
+    int crlf = flags & AP_GETLINE_CRLF;
 
     /*
      * Initialize last_char as otherwise a random value will be compared
@@ -229,13 +235,15 @@ AP_DECLARE(apr_status_t) ap_rgetline_cor
 
     for (;;) {
         apr_brigade_cleanup(bb);
-        rv = ap_get_brigade(r->input_filters, bb, AP_MODE_GETLINE,
+        rv = ap_get_brigade(r->proto_input_filters, bb, AP_MODE_GETLINE,
                             APR_BLOCK_READ, 0);
         if (rv != APR_SUCCESS) {
             return rv;
         }
 
-        /* Something horribly wrong happened.  Someone didn't block! */
+        /* Something horribly wrong happened.  Someone didn't block! 
+         * (this also happens at the end of each keepalive connection)
+         */
         if (APR_BRIGADE_EMPTY(bb)) {
             return APR_EGENERAL;
         }
@@ -321,6 +329,13 @@ AP_DECLARE(apr_status_t) ap_rgetline_cor
         }
     }
 
+    if (crlf && (last_char <= *s || last_char[-1] != APR_ASCII_CR)) {
+        *last_char = '\0';
+        bytes_handled = last_char - *s;
+        *read = bytes_handled;
+        return APR_EINVAL;
+    }
+
     /* Now NUL-terminate the string at the end of the line;
      * if the last-but-one character is a CR, terminate there */
     if (last_char > *s && last_char[-1] == APR_ASCII_CR) {
@@ -343,7 +358,7 @@ AP_DECLARE(apr_status_t) ap_rgetline_cor
             apr_brigade_cleanup(bb);
 
             /* We only care about the first byte. */
-            rv = ap_get_brigade(r->input_filters, bb, AP_MODE_SPECULATIVE,
+            rv = ap_get_brigade(r->proto_input_filters, bb, AP_MODE_SPECULATIVE,
                                 APR_BLOCK_READ, 1);
             if (rv != APR_SUCCESS) {
                 return rv;
@@ -394,7 +409,8 @@ AP_DECLARE(apr_status_t) ap_rgetline_cor
                      */
                     if (do_alloc) {
                         tmp = NULL;
-                    } else {
+                    }
+                    else {
                         /* We're null terminated. */
                         tmp = last_char;
                     }
@@ -464,7 +480,7 @@ AP_DECLARE(apr_status_t) ap_rgetline(cha
 }
 #endif
 
-AP_DECLARE(int) ap_getline(char *s, int n, request_rec *r, int fold)
+AP_DECLARE(int) ap_getline(char *s, int n, request_rec *r, int flags)
 {
     char *tmp_s = s;
     apr_status_t rv;
@@ -472,7 +488,7 @@ AP_DECLARE(int) ap_getline(char *s, int
     apr_bucket_brigade *tmp_bb;
 
     tmp_bb = apr_brigade_create(r->pool, r->connection->bucket_alloc);
-    rv = ap_rgetline(&tmp_s, n, &len, r, fold, tmp_bb);
+    rv = ap_rgetline(&tmp_s, n, &len, r, flags, tmp_bb);
     apr_brigade_destroy(tmp_bb);
 
     /* Map the out-of-space condition to the old API. */
@@ -552,16 +568,29 @@ AP_CORE_DECLARE(void) ap_parse_uri(reque
     }
 }
 
-static int read_request_line(request_rec *r, apr_bucket_brigade *bb)
+/* get the length of the field name for logging, but no more than 80 bytes */
+#define LOG_NAME_MAX_LEN 80
+static int field_name_len(const char *field)
 {
-    const char *ll;
-    const char *uri;
-    const char *pro;
+    const char *end = ap_strchr_c(field, ':');
+    if (end == NULL || end - field > LOG_NAME_MAX_LEN)
+        return LOG_NAME_MAX_LEN;
+    return end - field;
+}
 
-    unsigned int major = 1, minor = 0;   /* Assume HTTP/1.0 if non-"HTTP" protocol */
-    char http[5];
+static int read_request_line(request_rec *r, apr_bucket_brigade *bb)
+{
+    enum {
+        rrl_none, rrl_badmethod, rrl_badwhitespace, rrl_excesswhitespace,
+        rrl_missinguri, rrl_baduri, rrl_badprotocol, rrl_trailingtext,
+        rrl_badmethod09, rrl_reject09
+    } deferred_error = rrl_none;
+    char *ll;
+    char *uri;
     apr_size_t len;
     int num_blank_lines = DEFAULT_LIMIT_BLANK_LINES;
+    core_server_config *conf = ap_get_core_module_config(r->server->module_config);
+    int strict = (conf->http_conformance != AP_HTTP_CONFORMANCE_UNSAFE);
 
     /* Read past empty lines until we get a real request line,
      * a read error, the connection closes (EOF), or we timeout.
@@ -586,7 +615,7 @@ static int read_request_line(request_rec
          */
         r->the_request = NULL;
         rv = ap_rgetline(&(r->the_request), (apr_size_t)(r->server->limit_req_line + 2),
-                         &len, r, 0, bb);
+                         &len, r, strict ? AP_GETLINE_CRLF : 0, bb);
 
         if (rv != APR_SUCCESS) {
             r->request_time = apr_time_now();
@@ -596,7 +625,7 @@ static int read_request_line(request_rec
              * happen if it exceeds the configured limit for a request-line.
              */
             if (APR_STATUS_IS_ENOSPC(rv)) {
-                r->status    = HTTP_REQUEST_URI_TOO_LARGE;
+                r->status = HTTP_REQUEST_URI_TOO_LARGE;
             }
             else if (APR_STATUS_IS_TIMEUP(rv)) {
                 r->status = HTTP_REQUEST_TIME_OUT;
@@ -617,58 +646,269 @@ static int read_request_line(request_rec
     }
 
     r->request_time = apr_time_now();
-    ll = r->the_request;
-    r->method = ap_getword_white(r->pool, &ll);
 
-    uri = ap_getword_white(r->pool, &ll);
+    r->method = r->the_request;
 
-    if (!*r->method || !*uri) {
-        r->status    = HTTP_BAD_REQUEST;
-        r->proto_num = HTTP_VERSION(1,0);
-        r->protocol  = apr_pstrdup(r->pool, "HTTP/1.0");
-        return 0;
+    /* If there is whitespace before a method, skip it and mark in error */
+    if (apr_isspace(*r->method)) {
+        deferred_error = rrl_badwhitespace; 
+        for ( ; apr_isspace(*r->method); ++r->method)
+            ; 
+    }
+
+    /* Scan the method up to the next whitespace, ensure it contains only
+     * valid http-token characters, otherwise mark in error
+     */
+    if (strict) {
+        ll = (char*) ap_scan_http_token(r->method);
+    }
+    else {
+        ll = (char*) ap_scan_vchar_obstext(r->method);
+    }
+
+    if (((ll == r->method) || (*ll && !apr_isspace(*ll)))
+            && deferred_error == rrl_none) {
+        deferred_error = rrl_badmethod;
+        ll = strpbrk(ll, "\t\n\v\f\r ");
+    }
+
+    /* Verify method terminated with a single SP, or mark as specific error */
+    if (!ll) {
+        if (deferred_error == rrl_none)
+            deferred_error = rrl_missinguri;
+        r->protocol = uri = "";
+        len = 0;
+        goto rrl_done;
+    }
+    else if (strict && ll[0] && apr_isspace(ll[1])
+             && deferred_error == rrl_none) {
+        deferred_error = rrl_excesswhitespace; 
+    }
+
+    /* Advance uri pointer over leading whitespace, NUL terminate the method
+     * If non-SP whitespace is encountered, mark as specific error
+     */
+    for (uri = ll; apr_isspace(*uri); ++uri) 
+        if (*uri != ' ' && deferred_error == rrl_none)
+            deferred_error = rrl_badwhitespace; 
+    *ll = '\0';
+
+    if (!*uri && deferred_error == rrl_none)
+        deferred_error = rrl_missinguri;
+
+    /* Scan the URI up to the next whitespace, ensure it contains no raw
+     * control characters, otherwise mark in error
+     */
+    ll = (char*) ap_scan_vchar_obstext(uri);
+    if (ll == uri || (*ll && !apr_isspace(*ll))) {
+        deferred_error = rrl_baduri;
+        ll = strpbrk(ll, "\t\n\v\f\r ");
+    }
+
+    /* Verify URI terminated with a single SP, or mark as specific error */
+    if (!ll) {
+        r->protocol = "";
+        len = 0;
+        goto rrl_done;
+    }
+    else if (strict && ll[0] && apr_isspace(ll[1])
+             && deferred_error == rrl_none) {
+        deferred_error = rrl_excesswhitespace; 
+    }
+
+    /* Advance protocol pointer over leading whitespace, NUL terminate the uri
+     * If non-SP whitespace is encountered, mark as specific error
+     */
+    for (r->protocol = ll; apr_isspace(*r->protocol); ++r->protocol) 
+        if (*r->protocol != ' ' && deferred_error == rrl_none)
+            deferred_error = rrl_badwhitespace; 
+    *ll = '\0';
+
+    /* Scan the protocol up to the next whitespace, validation comes later */
+    if (!(ll = (char*) ap_scan_vchar_obstext(r->protocol))) {
+        len = strlen(r->protocol);
+        goto rrl_done;
+    }
+    len = ll - r->protocol;
+
+    /* Advance over trailing whitespace, if found mark in error,
+     * determine if trailing text is found, unconditionally mark in error,
+     * finally NUL terminate the protocol string
+     */
+    if (*ll && !apr_isspace(*ll)) {
+        deferred_error = rrl_badprotocol;
+    }
+    else if (strict && *ll) {
+        deferred_error = rrl_excesswhitespace;
     }
+    else {
+        for ( ; apr_isspace(*ll); ++ll)
+            if (*ll != ' ' && deferred_error == rrl_none)
+                deferred_error = rrl_badwhitespace; 
+        if (*ll && deferred_error == rrl_none)
+            deferred_error = rrl_trailingtext;
+    }
+    *((char *)r->protocol + len) = '\0';
+
+rrl_done:
+    /* For internal integrety and palloc efficiency, reconstruct the_request
+     * in one palloc, using only single SP characters, per spec.
+     */
+    r->the_request = apr_pstrcat(r->pool, r->method, *uri ? " " : NULL, uri,
+                                 *r->protocol ? " " : NULL, r->protocol, NULL);
 
-    /* Provide quick information about the request method as soon as known */
+    if (len == 8
+            && r->protocol[0] == 'H' && r->protocol[1] == 'T'
+            && r->protocol[2] == 'T' && r->protocol[3] == 'P'
+            && r->protocol[4] == '/' && apr_isdigit(r->protocol[5])
+            && r->protocol[6] == '.' && apr_isdigit(r->protocol[7])
+            && r->protocol[5] != '0') {
+        r->assbackwards = 0;
+        r->proto_num = HTTP_VERSION(r->protocol[5] - '0', r->protocol[7] - '0');
+    }
+    else if (len == 8
+                 && (r->protocol[0] == 'H' || r->protocol[0] == 'h')
+                 && (r->protocol[1] == 'T' || r->protocol[1] == 't')
+                 && (r->protocol[2] == 'T' || r->protocol[2] == 't')
+                 && (r->protocol[3] == 'P' || r->protocol[3] == 'p')
+                 && r->protocol[4] == '/' && apr_isdigit(r->protocol[5])
+                 && r->protocol[6] == '.' && apr_isdigit(r->protocol[7])
+                 && r->protocol[5] != '0') {
+        r->assbackwards = 0;
+        r->proto_num = HTTP_VERSION(r->protocol[5] - '0', r->protocol[7] - '0');
+        if (strict && deferred_error == rrl_none)
+            deferred_error = rrl_badprotocol;
+        else
+            memcpy((char*)r->protocol, "HTTP", 4);
+    }
+    else if (r->protocol[0]) {
+        r->assbackwards = 0;
+        r->proto_num = HTTP_VERSION(1,0);
+        /* Defer setting the r->protocol string till error msg is composed */
+        if (strict && deferred_error == rrl_none)
+            deferred_error = rrl_badprotocol;
+        else
+            r->protocol  = "HTTP/1.0";
+    }
+    else {
+        r->assbackwards = 1;
+        r->protocol = "HTTP/0.9";
+        r->proto_num = HTTP_VERSION(0, 9);
+    }
 
+    /* Determine the method_number and parse the uri prior to invoking error
+     * handling, such that these fields are available for subsitution
+     */
     r->method_number = ap_method_number_of(r->method);
-    if (r->method_number == M_GET && r->method[0] == 'H') {
+    if (r->method_number == M_GET && r->method[0] == 'H')
         r->header_only = 1;
-    }
 
     ap_parse_uri(r, uri);
-    if (r->status != HTTP_OK) {
-        r->proto_num = HTTP_VERSION(1,0);
-        r->protocol  = apr_pstrdup(r->pool, "HTTP/1.0");
+
+    /* With the request understood, we can consider HTTP/0.9 specific errors */
+    if (r->proto_num == HTTP_VERSION(0, 9) && deferred_error == rrl_none) {
+        if (conf->http09_enable == AP_HTTP09_DISABLE)
+            deferred_error = rrl_reject09;
+        else if (strict && (r->method_number != M_GET || r->header_only))
+            deferred_error = rrl_badmethod09;
+    }
+
+    /* Now that the method, uri and protocol are all processed,
+     * we can safely resume any deferred error reporting
+     */
+    if (deferred_error != rrl_none) {
+        if (deferred_error == rrl_badmethod)
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03445)
+                          "HTTP Request Line; Invalid method token: '%.*s'",
+                          field_name_len(r->method), r->method);
+        else if (deferred_error == rrl_badmethod09)
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03444)
+                          "HTTP Request Line; Invalid method token: '%.*s'"
+                          " (only GET is allowed for HTTP/0.9 requests)",
+                          field_name_len(r->method), r->method);
+        else if (deferred_error == rrl_missinguri)
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03446)
+                          "HTTP Request Line; Missing URI");
+        else if (deferred_error == rrl_baduri)
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03454)
+                          "HTTP Request Line; URI incorrectly encoded: '%.*s'",
+                          field_name_len(r->uri), r->uri);
+        else if (deferred_error == rrl_badwhitespace)
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03447)
+                          "HTTP Request Line; Invalid whitespace");
+        else if (deferred_error == rrl_excesswhitespace)
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03448)
+                          "HTTP Request Line; Excess whitespace "
+                          "(disallowed by HttpProtocolOptions Strict");
+        else if (deferred_error == rrl_trailingtext)
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03449)
+                          "HTTP Request Line; Extraneous text found '%.*s' "
+                          "(perhaps whitespace was injected?)",
+                          field_name_len(ll), ll);
+        else if (deferred_error == rrl_reject09)
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02401)
+                          "HTTP Request Line; Rejected HTTP/0.9 request");
+        else if (deferred_error == rrl_badprotocol)
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02418)
+                          "HTTP Request Line; Unrecognized protocol '%.*s' "
+                          "(perhaps whitespace was injected?)",
+                          field_name_len(r->protocol), r->protocol);
+        r->status = HTTP_BAD_REQUEST;
+        goto rrl_failed;
+    }
+
+    if (conf->http_methods == AP_HTTP_METHODS_REGISTERED
+            && r->method_number == M_INVALID) {
+        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02423)
+                      "HTTP Request Line; Unrecognized HTTP method: '%.*s' "
+                      "(disallowed by RegisteredMethods)",
+                      field_name_len(r->method), r->method);
+        r->status = HTTP_NOT_IMPLEMENTED;
+        /* This can't happen in an HTTP/0.9 request, we verified GET above */
         return 0;
     }
 
-    if (ll[0]) {
-        r->assbackwards = 0;
-        pro = ll;
-        len = strlen(ll);
-    } else {
-        r->assbackwards = 1;
-        pro = "HTTP/0.9";
-        len = 8;
+    if (r->status != HTTP_OK) {
+        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03450)
+                      "HTTP Request Line; Unable to parse URI: '%.*s'",
+                      field_name_len(r->uri), r->uri);
+        goto rrl_failed;
     }
-    r->protocol = apr_pstrmemdup(r->pool, pro, len);
 
-    /* Avoid sscanf in the common case */
-    if (len == 8
-        && pro[0] == 'H' && pro[1] == 'T' && pro[2] == 'T' && pro[3] == 'P'
-        && pro[4] == '/' && apr_isdigit(pro[5]) && pro[6] == '.'
-        && apr_isdigit(pro[7])) {
-        r->proto_num = HTTP_VERSION(pro[5] - '0', pro[7] - '0');
-    }
-    else if (3 == sscanf(r->protocol, "%4s/%u.%u", http, &major, &minor)
-             && (strcasecmp("http", http) == 0)
-             && (minor < HTTP_VERSION(1, 0)) ) /* don't allow HTTP/0.1000 */
-        r->proto_num = HTTP_VERSION(major, minor);
-    else
-        r->proto_num = HTTP_VERSION(1, 0);
+    if (strict) {
+        if (r->parsed_uri.fragment) {
+            /* RFC3986 3.5: no fragment */
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02421)
+                          "HTTP Request Line; URI must not contain a fragment");
+            r->status = HTTP_BAD_REQUEST;
+            goto rrl_failed;
+        }
+        if (r->parsed_uri.user || r->parsed_uri.password) {
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02422)
+                          "HTTP Request Line; URI must not contain a "
+                          "username/password");
+            r->status = HTTP_BAD_REQUEST;
+            goto rrl_failed;
+        }
+    }
 
     return 1;
+
+rrl_failed:
+    if (r->proto_num == HTTP_VERSION(0, 9)) {
+        /* Send all parsing and protocol error response with 1.x behavior,
+         * and reserve 505 errors for actual HTTP protocols presented.
+         * As called out in RFC7230 3.5, any errors parsing the protocol
+         * from the request line are nearly always misencoded HTTP/1.x
+         * requests. Only a valid 0.9 request with no parsing errors
+         * at all may be treated as a simple request, if allowed.
+         */
+        r->assbackwards = 0;
+        r->connection->keepalive = AP_CONN_CLOSE;
+        r->proto_num = HTTP_VERSION(1, 0);
+        r->protocol  = "HTTP/1.0";
+    }
+    return 0;
 }
 
 static int table_do_fn_check_lengths(void *r_, const char *key,
@@ -680,26 +920,13 @@ static int table_do_fn_check_lengths(voi
 
     r->status = HTTP_BAD_REQUEST;
     apr_table_setn(r->notes, "error-notes",
-                   apr_pstrcat(r->pool, "Size of a request header field "
-                               "after merging exceeds server limit.<br />"
-                               "\n<pre>\n",
-                               ap_escape_html(r->pool, key),
-                               "</pre>\n", NULL));
-    ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00560) "Request header "
-                  "exceeds LimitRequestFieldSize after merging: %s", key);
+                   "Size of a request header field exceeds server limit.");
+    ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00560) "Request "
+                  "header exceeds LimitRequestFieldSize after merging: %.*s",
+                  field_name_len(key), key);
     return 0;
 }
 
-/* get the length of the field name for logging, but no more than 80 bytes */
-#define LOG_NAME_MAX_LEN 80
-static int field_name_len(const char *field)
-{
-    const char *end = ap_strchr_c(field, ':');
-    if (end == NULL || end - field > LOG_NAME_MAX_LEN)
-        return LOG_NAME_MAX_LEN;
-    return end - field;
-}
-
 AP_DECLARE(void) ap_get_mime_headers_core(request_rec *r, apr_bucket_brigade *bb)
 {
     char *last_field = NULL;
@@ -710,6 +937,8 @@ AP_DECLARE(void) ap_get_mime_headers_cor
     apr_size_t len;
     int fields_read = 0;
     char *tmp_field;
+    core_server_config *conf = ap_get_core_module_config(r->server->module_config);
+    int strict = (conf->http_conformance != AP_HTTP_CONFORMANCE_UNSAFE);
 
     /*
      * Read header lines until we get the empty separator line, a read error,
@@ -717,11 +946,10 @@ AP_DECLARE(void) ap_get_mime_headers_cor
      */
     while(1) {
         apr_status_t rv;
-        int folded = 0;
 
         field = NULL;
         rv = ap_rgetline(&field, r->server->limit_req_fieldsize + 2,
-                         &len, r, 0, bb);
+                         &len, r, strict ? AP_GETLINE_CRLF : 0, bb);
 
         if (rv != APR_SUCCESS) {
             if (APR_STATUS_IS_TIMEUP(rv)) {
@@ -738,156 +966,218 @@ AP_DECLARE(void) ap_get_mime_headers_cor
              * exceeds the configured limit for a field size.
              */
             if (rv == APR_ENOSPC) {
-                const char *field_escaped;
-                if (field && len) {
-                    /* ensure ap_escape_html will terminate correctly */
-                    field[len - 1] = '\0';
-                    field_escaped = ap_escape_html(r->pool, field);
-                }
-                else {
-                    field_escaped = field = "";
-                }
-
                 apr_table_setn(r->notes, "error-notes",
-                               apr_psprintf(r->pool,
-                                           "Size of a request header field "
-                                           "exceeds server limit.<br />\n"
-                                           "<pre>\n%.*s\n</pre>\n", 
-                                           field_name_len(field_escaped),
-                                           field_escaped));
+                               "Size of a request header field "
+                               "exceeds server limit.");
                 ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00561)
                               "Request header exceeds LimitRequestFieldSize%s"
                               "%.*s",
-                              *field ? ": " : "",
-                              field_name_len(field), field);
+                              (field && *field) ? ": " : "",
+                              (field) ? field_name_len(field) : 0,
+                              (field) ? field : "");
             }
             return;
         }
 
-        if (last_field != NULL) {
-            if ((len > 0) && ((*field == '\t') || *field == ' ')) {
-                /* This line is a continuation of the preceding line(s),
-                 * so append it to the line that we've set aside.
-                 * Note: this uses a power-of-two allocator to avoid
-                 * doing O(n) allocs and using O(n^2) space for
-                 * continuations that span many many lines.
-                 */
-                apr_size_t fold_len = last_len + len + 1; /* trailing null */
+        /* For all header values, and all obs-fold lines, the presence of
+         * additional whitespace is a no-op, so collapse trailing whitespace
+         * to save buffer allocation and optimize copy operations.
+         * Do not remove the last single whitespace under any condition.
+         */
+        while (len > 1 && (field[len-1] == '\t' || field[len-1] == ' ')) {
+            field[--len] = '\0';
+        } 
 
-                if (fold_len >= (apr_size_t)(r->server->limit_req_fieldsize)) {
-                    const char *field_escaped;
+        if (*field == '\t' || *field == ' ') {
 
-                    r->status = HTTP_BAD_REQUEST;
-                    /* report what we have accumulated so far before the
-                     * overflow (last_field) as the field with the problem
-                     */
-                    field_escaped = ap_escape_html(r->pool, last_field);
-                    apr_table_setn(r->notes, "error-notes",
-                                   apr_psprintf(r->pool,
-                                               "Size of a request header field "
-                                               "after folding "
-                                               "exceeds server limit.<br />\n"
-                                               "<pre>\n%.*s\n</pre>\n", 
-                                               field_name_len(field_escaped), 
-                                               field_escaped));
-                    ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00562)
-                                  "Request header exceeds LimitRequestFieldSize "
-                                  "after folding: %.*s",
-                                  field_name_len(last_field), last_field);
-                    return;
-                }
+            /* Append any newly-read obs-fold line onto the preceding
+             * last_field line we are processing
+             */
+            apr_size_t fold_len;
 
+            if (last_field == NULL) {
+                r->status = HTTP_BAD_REQUEST;
+                ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03442)
+                              "Line folding encountered before first"
+                              " header line");
+                return;
+            }
+
+            if (field[1] == '\0') {
+                r->status = HTTP_BAD_REQUEST;
+                ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03443)
+                              "Empty folded line encountered");
+                return;
+            }
+
+            /* Leading whitespace on an obs-fold line can be
+             * similarly discarded */
+            while (field[1] == '\t' || field[1] == ' ') {
+                ++field; --len;
+            }
+
+            /* This line is a continuation of the preceding line(s),
+             * so append it to the line that we've set aside.
+             * Note: this uses a power-of-two allocator to avoid
+             * doing O(n) allocs and using O(n^2) space for
+             * continuations that span many many lines.
+             */
+            fold_len = last_len + len + 1; /* trailing null */
+
+            if (fold_len >= (apr_size_t)(r->server->limit_req_fieldsize)) {
+                r->status = HTTP_BAD_REQUEST;
+                /* report what we have accumulated so far before the
+                 * overflow (last_field) as the field with the problem
+                 */
+                apr_table_setn(r->notes, "error-notes",
+                               "Size of a request header field "
+                               "exceeds server limit.");
+                ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00562)
+                              "Request header exceeds LimitRequestFieldSize "
+                              "after folding: %.*s",
+                              field_name_len(last_field), last_field);
+                return;
+            }
+
+            if (fold_len > alloc_len) {
+                char *fold_buf;
+                alloc_len += alloc_len;
                 if (fold_len > alloc_len) {
-                    char *fold_buf;
-                    alloc_len += alloc_len;
-                    if (fold_len > alloc_len) {
-                        alloc_len = fold_len;
-                    }
-                    fold_buf = (char *)apr_palloc(r->pool, alloc_len);
-                    memcpy(fold_buf, last_field, last_len);
-                    last_field = fold_buf;
+                    alloc_len = fold_len;
                 }
-                memcpy(last_field + last_len, field, len +1); /* +1 for nul */
-                last_len += len;
-                folded = 1;
-            }
-            else /* not a continuation line */ {
+                fold_buf = (char *)apr_palloc(r->pool, alloc_len);
+                memcpy(fold_buf, last_field, last_len);
+                last_field = fold_buf;
+            }
+            memcpy(last_field + last_len, field, len +1); /* +1 for nul */
+            /* Replace obs-fold w/ SP per RFC 7230 3.2.4 */
+            last_field[last_len] = ' ';
+            last_len += len;
+
+            /* We've appended this obs-fold line to last_len, proceed to
+             * read the next input line
+             */
+            continue;
+        }
+        else if (last_field != NULL) {
 
-                if (r->server->limit_req_fields
+            /* Process the previous last_field header line with all obs-folded
+             * segments already concatinated (this is not operating on the
+             * most recently read input line).
+             */
+
+            if (r->server->limit_req_fields
                     && (++fields_read > r->server->limit_req_fields)) {
-                    r->status = HTTP_BAD_REQUEST;
-                    apr_table_setn(r->notes, "error-notes",
-                                   "The number of request header fields "
-                                   "exceeds this server's limit.");
-                    ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00563)
-                                  "Number of request headers exceeds "
-                                  "LimitRequestFields");
-                    return;
-                }
+                r->status = HTTP_BAD_REQUEST;
+                apr_table_setn(r->notes, "error-notes",
+                               "The number of request header fields "
+                               "exceeds this server's limit.");
+                ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00563)
+                              "Number of request headers exceeds "
+                              "LimitRequestFields");
+                return;
+            }
 
-                if (!(value = strchr(last_field, ':'))) { /* Find ':' or    */
-                    r->status = HTTP_BAD_REQUEST;      /* abort bad request */
-                    apr_table_setn(r->notes, "error-notes",
-                                   apr_psprintf(r->pool,
-                                               "Request header field is "
-                                               "missing ':' separator.<br />\n"
-                                               "<pre>\n%.*s</pre>\n", 
-                                               (int)LOG_NAME_MAX_LEN,
-                                               ap_escape_html(r->pool,
-                                                              last_field)));
-                    ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00564)
+            if (!strict)
+            {
+                /* Not Strict ('Unsafe' mode), using the legacy parser */
+
+                if (!(value = strchr(last_field, ':'))) { /* Find ':' or */
+                    r->status = HTTP_BAD_REQUEST;   /* abort bad request */
+                    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00564)
                                   "Request header field is missing ':' "
                                   "separator: %.*s", (int)LOG_NAME_MAX_LEN,
                                   last_field);
                     return;
                 }
 
-                tmp_field = value - 1; /* last character of field-name */
+                /* last character of field-name */
+                tmp_field = value - (value > last_field ? 1 : 0);
 
                 *value++ = '\0'; /* NUL-terminate at colon */
 
+                if (strpbrk(last_field, "\t\n\v\f\r ")) {
+                    r->status = HTTP_BAD_REQUEST;
+                    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03452)
+                                  "Request header field name presented"
+                                  " invalid whitespace");
+                    return;
+                }
+
                 while (*value == ' ' || *value == '\t') {
-                    ++value;            /* Skip to start of value   */
+                     ++value;            /* Skip to start of value   */
                 }
 
-                /* Strip LWS after field-name: */
-                while (tmp_field > last_field
-                       && (*tmp_field == ' ' || *tmp_field == '\t')) {
-                    *tmp_field-- = '\0';
+                if (strpbrk(value, "\n\v\f\r")) {
+                    r->status = HTTP_BAD_REQUEST;
+                    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03451)
+                                  "Request header field value presented"
+                                  " bad whitespace");
+                    return;
                 }
 
-                /* Strip LWS after field-value: */
-                tmp_field = last_field + last_len - 1;
-                while (tmp_field > value
-                       && (*tmp_field == ' ' || *tmp_field == '\t')) {
-                    *tmp_field-- = '\0';
+                if (tmp_field == last_field) {
+                    r->status = HTTP_BAD_REQUEST;
+                    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(03453)
+                                  "Request header field name was empty");
+                    return;
                 }
+            }
+            else /* Using strict RFC7230 parsing */
+            {
+                /* Ensure valid token chars before ':' per RFC 7230 3.2.4 */
+                value = (char *)ap_scan_http_token(last_field);
+                if ((value == last_field) || *value != ':') {
+                    r->status = HTTP_BAD_REQUEST;
+                    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02426)
+                                  "Request header field name is malformed: "
+                                  "%.*s", (int)LOG_NAME_MAX_LEN, last_field);
+                    return;
+                }
+
+                *value++ = '\0'; /* NUL-terminate last_field name at ':' */
 
-                apr_table_addn(r->headers_in, last_field, value);
+                while (*value == ' ' || *value == '\t') {
+                    ++value;     /* Skip LWS of value */
+                }
+
+                /* Find invalid, non-HT ctrl char, or the trailing NULL */
+                tmp_field = (char *)ap_scan_http_field_content(value);
 
-                /* reset the alloc_len so that we'll allocate a new
-                 * buffer if we have to do any more folding: we can't
-                 * use the previous buffer because its contents are
-                 * now part of r->headers_in
+                /* Reject value for all garbage input (CTRLs excluding HT)
+                 * e.g. only VCHAR / SP / HT / obs-text are allowed per
+                 * RFC7230 3.2.6 - leave all more explicit rule enforcement
+                 * for specific header handler logic later in the cycle
                  */
-                alloc_len = 0;
+                if (*tmp_field != '\0') {
+                    r->status = HTTP_BAD_REQUEST;
+                    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02427)
+                                  "Request header value is malformed: "
+                                  "%.*s", (int)LOG_NAME_MAX_LEN, value);
+                    return;
+                }
+            }
+
+            apr_table_addn(r->headers_in, last_field, value);
 
-            } /* end if current line is not a continuation starting with tab */
+            /* This last_field header is now stored in headers_in,
+             * resume processing of the current input line.
+             */
         }
 
-        /* Found a blank line, stop. */
+        /* Found the terminating empty end-of-headers line, stop. */
         if (len == 0) {
             break;
         }
 
-        /* Keep track of this line so that we can parse it on
-         * the next loop iteration.  (In the folded case, last_field
-         * has been updated already.)
+        /* Keep track of this new header line so that we can extend it across
+         * any obs-fold or parse it on the next loop iteration. We referenced
+         * our previously allocated buffer in r->headers_in,
+         * so allocate a fresh buffer if required.
          */
-        if (!folded) {
-            last_field = field;
-            last_len = len;
-        }
+        alloc_len = 0;
+        last_field = field;
+        last_len = len;
     }
 
     /* Combine multiple message-header fields with the same
@@ -912,7 +1202,7 @@ request_rec *ap_read_request(conn_rec *c
     request_rec *r;
     apr_pool_t *p;
     const char *expect;
-    int access_status = HTTP_OK;
+    int access_status;
     apr_bucket_brigade *tmp_bb;
     apr_socket_t *csd;
     apr_interval_time_t cur_timeout;
@@ -971,16 +1261,19 @@ request_rec *ap_read_request(conn_rec *c
 
     /* Get the request... */
     if (!read_request_line(r, tmp_bb)) {
-        if (r->status == HTTP_REQUEST_URI_TOO_LARGE
-            || r->status == HTTP_BAD_REQUEST) {
+        switch (r->status) {
+        case HTTP_REQUEST_URI_TOO_LARGE:
+        case HTTP_BAD_REQUEST:
+        case HTTP_VERSION_NOT_SUPPORTED:
+        case HTTP_NOT_IMPLEMENTED:
             if (r->status == HTTP_REQUEST_URI_TOO_LARGE) {
                 ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00565)
                               "request failed: client's request-line exceeds LimitRequestLine (longer than %d)",
                               r->server->limit_req_line);
             }
             else if (r->method == NULL) {
-                ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00566)
-                              "request failed: invalid characters in URI");
+                ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00566)
+                              "request failed: malformed request line");
             }
             access_status = r->status;
             r->status = HTTP_OK;
@@ -990,19 +1283,17 @@ request_rec *ap_read_request(conn_rec *c
             r = NULL;
             apr_brigade_destroy(tmp_bb);
             goto traceout;
-        }
-        else if (r->status == HTTP_REQUEST_TIME_OUT) {
+        case HTTP_REQUEST_TIME_OUT:
             ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, NULL);
-            if (!r->connection->keepalives) {
+            if (!r->connection->keepalives)
                 ap_run_log_transaction(r);
-            }
             apr_brigade_destroy(tmp_bb);
             goto traceout;
+        default:
+            apr_brigade_destroy(tmp_bb);
+            r = NULL;
+            goto traceout;
         }
-
-        apr_brigade_destroy(tmp_bb);
-        r = NULL;
-        goto traceout;
     }
 
     /* We may have been in keep_alive_timeout mode, so toggle back
@@ -1021,7 +1312,7 @@ request_rec *ap_read_request(conn_rec *c
 
         ap_get_mime_headers_core(r, tmp_bb);
         if (r->status != HTTP_OK) {
-            ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00567)
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00567)
                           "request failed: error reading the headers");
             ap_send_error_response(r, 0);
             ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r);
@@ -1040,7 +1331,7 @@ request_rec *ap_read_request(conn_rec *c
              */
             if (!(strcasecmp(tenc, "chunked") == 0 /* fast path */
                     || ap_find_last_token(r->pool, tenc, "chunked"))) {
-                ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(02539)
+                ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02539)
                               "client sent unknown Transfer-Encoding "
                               "(%s): %s", tenc, r->uri);
                 r->status = HTTP_BAD_REQUEST;
@@ -1061,25 +1352,6 @@ request_rec *ap_read_request(conn_rec *c
             apr_table_unset(r->headers_in, "Content-Length");
         }
     }
-    else {
-        if (r->header_only) {
-            /*
-             * Client asked for headers only with HTTP/0.9, which doesn't send
-             * headers! Have to dink things just to make sure the error message
-             * comes through...
-             */
-            ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00568)
-                          "client sent invalid HTTP/0.9 request: HEAD %s",
-                          r->uri);
-            r->header_only = 0;
-            r->status = HTTP_BAD_REQUEST;
-            ap_send_error_response(r, 0);
-            ap_update_child_status(conn->sbh, SERVER_BUSY_LOG, r);
-            ap_run_log_transaction(r);
-            apr_brigade_destroy(tmp_bb);
-            goto traceout;
-        }
-    }
 
     apr_brigade_destroy(tmp_bb);
 
@@ -1087,6 +1359,7 @@ request_rec *ap_read_request(conn_rec *c
      * now read. may update status.
      */
     ap_update_vhost_from_headers(r);
+    access_status = r->status;
 
     /* Toggle to the Host:-based vhost's timeout mode to fetch the
      * request body and send the response body, if needed.
@@ -1110,7 +1383,7 @@ request_rec *ap_read_request(conn_rec *c
          * a Host: header, and the server MUST respond with 400 if it doesn't.
          */
         access_status = HTTP_BAD_REQUEST;
-        ap_log_rerror(APLOG_MARK, APLOG_INFO, 0, r, APLOGNO(00569)
+        ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00569)
                       "client sent HTTP/1.1 request without hostname "
                       "(see RFC2616 section 14.23): %s", r->uri);
     }
Index: httpd-2.4.23/server/util.c
===================================================================
--- httpd-2.4.23.orig/server/util.c	2016-06-14 01:31:21.000000000 +0200
+++ httpd-2.4.23/server/util.c	2017-02-24 10:48:06.674800511 +0100
@@ -79,7 +79,7 @@
  * char in here and get it to work, because if char is signed then it
  * will first be sign extended.
  */
-#define TEST_CHAR(c, f)        (test_char_table[(unsigned)(c)] & (f))
+#define TEST_CHAR(c, f)        (test_char_table[(unsigned char)(c)] & (f))
 
 /* Win32/NetWare/OS2 need to check for both forward and back slashes
  * in ap_getparents() and ap_escape_url.
@@ -1525,7 +1525,7 @@ AP_DECLARE(const char *) ap_parse_token_
     while (!string_end) {
         const unsigned char c = (unsigned char)*cur;
 
-        if (!TEST_CHAR(c, T_HTTP_TOKEN_STOP) && c != '\0') {
+        if (!TEST_CHAR(c, T_HTTP_TOKEN_STOP)) {
             /* Non-separator character; we are finished with leading
              * whitespace. We must never have encountered any trailing
              * whitespace before the delimiter (comma) */
@@ -1593,6 +1593,37 @@ AP_DECLARE(const char *) ap_parse_token_
     return NULL;
 }
 
+/* Scan a string for HTTP VCHAR/obs-text characters including HT and SP
+ * (as used in header values, for example, in RFC 7230 section 3.2)
+ * returning the pointer to the first non-HT ASCII ctrl character.
+ */
+AP_DECLARE(const char *) ap_scan_http_field_content(const char *ptr)
+{
+    for ( ; !TEST_CHAR(*ptr, T_HTTP_CTRLS); ++ptr) ;
+
+    return ptr;
+}
+
+/* Scan a string for HTTP token characters, returning the pointer to
+ * the first non-token character.
+ */
+AP_DECLARE(const char *) ap_scan_http_token(const char *ptr)
+{
+    for ( ; !TEST_CHAR(*ptr, T_HTTP_TOKEN_STOP); ++ptr) ;
+
+    return ptr;
+}
+
+/* Scan a string for visible ASCII (0x21-0x7E) or obstext (0x80+)
+ * and return a pointer to the first ctrl/space character encountered.
+ */
+AP_DECLARE(const char *) ap_scan_vchar_obstext(const char *ptr)
+{
+    for ( ; TEST_CHAR(*ptr, T_VCHAR_OBSTEXT); ++ptr) ;
+
+    return ptr;
+}
+
 /* Retrieve a token, spacing over it and returning a pointer to
  * the first non-white byte afterwards.  Note that these tokens
  * are delimited by semis and commas; and can also be delimited
Index: httpd-2.4.23/server/vhost.c
===================================================================
--- httpd-2.4.23.orig/server/vhost.c	2016-02-18 16:07:06.000000000 +0100
+++ httpd-2.4.23/server/vhost.c	2017-02-24 10:48:06.674800511 +0100
@@ -687,6 +687,116 @@ static int vhost_check_config(apr_pool_t
  * run-time vhost matching functions
  */
 
+static apr_status_t fix_hostname_v6_literal(request_rec *r, char *host)
+{
+    char *dst;
+    int double_colon = 0;
+
+    for (dst = host; *dst; dst++) {
+        if (apr_isxdigit(*dst)) {
+            if (apr_isupper(*dst)) {
+                *dst = apr_tolower(*dst);
+            }
+        }
+        else if (*dst == ':') {
+            if (*(dst + 1) == ':') {
+                if (double_colon)
+                    return APR_EINVAL;
+                double_colon = 1;
+            }
+            else if (*(dst + 1) == '.') {
+                return APR_EINVAL;
+            }
+        }
+        else if (*dst == '.') {
+            /* For IPv4-mapped IPv6 addresses like ::FFFF:129.144.52.38 */
+            if (*(dst + 1) == ':' || *(dst + 1) == '.')
+                return APR_EINVAL;
+        }
+        else {
+            return APR_EINVAL;
+        }
+    }
+    return APR_SUCCESS;
+}
+
+static apr_status_t fix_hostname_non_v6(request_rec *r, char *host)
+{
+    char *dst;
+
+    for (dst = host; *dst; dst++) {
+        if (apr_islower(*dst)) {
+            /* leave char unchanged */
+        }
+        else if (*dst == '.') {
+            if (*(dst + 1) == '.') {
+                return APR_EINVAL;
+            }
+        }
+        else if (apr_isupper(*dst)) {
+            *dst = apr_tolower(*dst);
+        }
+        else if (*dst == '/' || *dst == '\\') {
+            return APR_EINVAL;
+        }
+    }
+    /* strip trailing gubbins */
+    if (dst > host && dst[-1] == '.') {
+        dst[-1] = '\0';
+    }
+    return APR_SUCCESS;
+}
+
+/*
+ * If strict mode ever becomes the default, this should be folded into
+ * fix_hostname_non_v6()
+ */
+static apr_status_t strict_hostname_check(request_rec *r, char *host)
+{
+    char *ch;
+    int is_dotted_decimal = 1, leading_zeroes = 0, dots = 0;
+
+    for (ch = host; *ch; ch++) {
+        if (!apr_isascii(*ch)) {
+            goto bad;
+        }
+        else if (apr_isalpha(*ch) || *ch == '-') {
+            is_dotted_decimal = 0;
+        }
+        else if (ch[0] == '.') {
+            dots++;
+            if (ch[1] == '0' && apr_isdigit(ch[2]))
+                leading_zeroes = 1;
+        }
+        else if (!apr_isdigit(*ch)) {
+           /* also takes care of multiple Host headers by denying commas */
+            goto bad;
+        }
+    }
+    if (is_dotted_decimal) {
+        if (host[0] == '.' || (host[0] == '0' && apr_isdigit(host[1])))
+            leading_zeroes = 1;
+        if (leading_zeroes || dots != 3) {
+            /* RFC 3986 7.4 */
+            goto bad;
+        }
+    }
+    else {
+        /* The top-level domain must start with a letter (RFC 1123 2.1) */
+        while (ch > host && *ch != '.')
+            ch--;
+        if (ch[0] == '.' && ch[1] != '\0' && !apr_isalpha(ch[1]))
+            goto bad;
+    }
+    return APR_SUCCESS;
+
+bad:
+    ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02415)
+                  "[strict] Invalid host name '%s'%s%.6s",
+                  host, *ch ? ", problem near: " : "", ch);
+    return APR_EINVAL;
+}
+
 /* Lowercase and remove any trailing dot and/or :port from the hostname,
  * and check that it is sane.
  *
@@ -700,79 +810,90 @@ static int vhost_check_config(apr_pool_t
  * Instead we just check for filesystem metacharacters: directory
  * separators / and \ and sequences of more than one dot.
  */
-static void fix_hostname(request_rec *r)
+static int fix_hostname(request_rec *r, const char *host_header,
+                        unsigned http_conformance)
 {
+    const char *src;
     char *host, *scope_id;
-    char *dst;
     apr_port_t port;
     apr_status_t rv;
     const char *c;
+    int is_v6literal = 0;
+    int strict = (http_conformance != AP_HTTP_CONFORMANCE_UNSAFE);
 
-    /* According to RFC 2616, Host header field CAN be blank. */
-    if (!*r->hostname) {
-        return;
+    src = host_header ? host_header : r->hostname;
+
+    /* According to RFC 2616, Host header field CAN be blank */
+    if (!*src) {
+        return is_v6literal;
     }
 
     /* apr_parse_addr_port will interpret a bare integer as a port
      * which is incorrect in this context.  So treat it separately.
      */
-    for (c = r->hostname; apr_isdigit(*c); ++c);
-    if (!*c) {  /* pure integer */
-        return;
+    for (c = src; apr_isdigit(*c); ++c);
+    if (!*c) {
+        /* pure integer */
+        if (strict) {
+            /* RFC 3986 7.4 */
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02416)
+                         "[strict] purely numeric host names not allowed: %s",
+                         src);
+            goto bad_nolog;
+        }
+        r->hostname = src;
+        return is_v6literal;
+    }
+
+    if (host_header) {
+        rv = apr_parse_addr_port(&host, &scope_id, &port, src, r->pool);
+        if (rv != APR_SUCCESS || scope_id)
+            goto bad;
+        if (port) {
+            /* Don't throw the Host: header's port number away:
+               save it in parsed_uri -- ap_get_server_port() needs it! */
+            /* @@@ XXX there should be a better way to pass the port.
+             *         Like r->hostname, there should be a r->portno
+             */
+            r->parsed_uri.port = port;
+            r->parsed_uri.port_str = apr_itoa(r->pool, (int)port);
+        }
+        if (host_header[0] == '[')
+            is_v6literal = 1;
+    }
+    else {
+        /*
+         * Already parsed, surrounding [ ] (if IPv6 literal) and :port have
+         * already been removed.
+         */
+        host = apr_pstrdup(r->pool, r->hostname);
+        if (ap_strchr(host, ':') != NULL)
+            is_v6literal = 1;
     }
 
-    rv = apr_parse_addr_port(&host, &scope_id, &port, r->hostname, r->pool);
-    if (rv != APR_SUCCESS || scope_id) {
-        goto bad;
+    if (is_v6literal) {
+        rv = fix_hostname_v6_literal(r, host);
     }
-
-    if (port) {
-        /* Don't throw the Host: header's port number away:
-           save it in parsed_uri -- ap_get_server_port() needs it! */
-        /* @@@ XXX there should be a better way to pass the port.
-         *         Like r->hostname, there should be a r->portno
-         */
-        r->parsed_uri.port = port;
-        r->parsed_uri.port_str = apr_itoa(r->pool, (int)port);
+    else {
+        rv = fix_hostname_non_v6(r, host);
+        if (strict && rv == APR_SUCCESS)
+            rv = strict_hostname_check(r, host);
     }
+    if (rv != APR_SUCCESS)
+        goto bad;
 
-    /* if the hostname is an IPv6 numeric address string, it was validated
-     * already; otherwise, further validation is needed
-     */
-    if (r->hostname[0] != '[') {
-        for (dst = host; *dst; dst++) {
-            if (apr_islower(*dst)) {
-                /* leave char unchanged */
-            }
-            else if (*dst == '.') {
-                if (*(dst + 1) == '.') {
-                    goto bad;
-                }
-            }
-            else if (apr_isupper(*dst)) {
-                *dst = apr_tolower(*dst);
-            }
-            else if (*dst == '/' || *dst == '\\') {
-                goto bad;
-            }
-        }
-        /* strip trailing gubbins */
-        if (dst > host && dst[-1] == '.') {
-            dst[-1] = '\0';
-        }
-    }
     r->hostname = host;
-    return;
+    return is_v6literal;
 
 bad:
-    r->status = HTTP_BAD_REQUEST;
     ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(00550)
                   "Client sent malformed Host header: %s",
-                  r->hostname);
-    return;
+                  src);
+bad_nolog:
+    r->status = HTTP_BAD_REQUEST;
+    return is_v6literal;
 }
 
-
 /* return 1 if host matches ServerName or ServerAliases */
 static int matches_aliases(server_rec *s, const char *host)
 {
@@ -982,15 +1103,76 @@ static void check_serverpath(request_rec
     }
 }
 
+static APR_INLINE const char *construct_host_header(request_rec *r,
+                                                    int is_v6literal)
+{
+    struct iovec iov[5];
+    apr_size_t nvec = 0;
+    /*
+     * We cannot use ap_get_server_name/port here, because we must
+     * ignore UseCanonicalName/Port.
+     */
+    if (is_v6literal) {
+        iov[nvec].iov_base = "[";
+        iov[nvec].iov_len = 1;
+        nvec++;
+    }
+    iov[nvec].iov_base = (void *)r->hostname;
+    iov[nvec].iov_len = strlen(r->hostname);
+    nvec++;
+    if (is_v6literal) {
+        iov[nvec].iov_base = "]";
+        iov[nvec].iov_len = 1;
+        nvec++;
+    }
+    if (r->parsed_uri.port_str) {
+        iov[nvec].iov_base = ":";
+        iov[nvec].iov_len = 1;
+        nvec++;
+        iov[nvec].iov_base = r->parsed_uri.port_str;
+        iov[nvec].iov_len = strlen(r->parsed_uri.port_str);
+        nvec++;
+    }
+    return apr_pstrcatv(r->pool, iov, nvec, NULL);
+}
 
 AP_DECLARE(void) ap_update_vhost_from_headers(request_rec *r)
 {
-    /* must set this for HTTP/1.1 support */
-    if (r->hostname || (r->hostname = apr_table_get(r->headers_in, "Host"))) {
-        fix_hostname(r);
-        if (r->status != HTTP_OK)
-            return;
+    core_server_config *conf = ap_get_core_module_config(r->server->module_config);
+    const char *host_header = apr_table_get(r->headers_in, "Host");
+    int is_v6literal = 0;
+    int have_hostname_from_url = 0;
+
+    if (r->hostname) {
+        /*
+         * If there was a host part in the Request-URI, ignore the 'Host'
+         * header.
+         */
+        have_hostname_from_url = 1;
+        is_v6literal = fix_hostname(r, NULL, conf->http_conformance);
+    }
+    else if (host_header != NULL) {
+        is_v6literal = fix_hostname(r, host_header, conf->http_conformance);
+    }
+    if (r->status != HTTP_OK)
+        return;
+
+    if (conf->http_conformance != AP_HTTP_CONFORMANCE_UNSAFE) {
+        /*
+         * If we have both hostname from an absoluteURI and a Host header,
+         * we must ignore the Host header (RFC 2616 5.2).
+         * To enforce this, we reset the Host header to the value from the
+         * request line.
+         */
+        if (have_hostname_from_url && host_header != NULL) {
+            const char *repl = construct_host_header(r, is_v6literal);
+            apr_table_set(r->headers_in, "Host", repl);
+            ap_log_rerror(APLOG_MARK, APLOG_DEBUG, 0, r, APLOGNO(02417)
+                          "Replacing host header '%s' with host '%s' given "
+                          "in the request uri", host_header, repl);
+        }
     }
+
     /* check if we tucked away a name_chain */
     if (r->connection->vhost_lookup_data) {
         if (r->hostname)
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