[PATCH v5 0/5] config: add support for http.<url>.* settings

[PATCH v5 0/5] config: add support for http.<url>.* settings

[Kyle J. McKay]

This patch series adds support for url-specific http.* settings.

It has been suggested that a preparatory patch to address the way the
http.sslCertPasswordProtected variable is handled be included.

I'm not sure if the intent was to make that a separate patch or include it
in a patch series together with the http.<url>.* settings updates.  I have,
however, included it here this time along with a second patch that does the
same thing for the GIT_SSL_CERT_PASSWORD_PROTECTED environment variable.

There is talk about possibly altering GIT_SSL_NO_VERIFY, GIT_CURL_FTP_NO_EPSV
and GIT_CURL_VERBOSE to behave similarly.  No patch is included here for that.

The http.<url>.* settings support addresses various feedback.  To better
support matching URLs that are equivalent but spelled differently, a
url_normalize function has been added.  Currently this patch leaves it in
http.c as http_options_url_normalize as I am unclear whether it should go into
url.{h,c} at this time since only http.c uses.

Since the url_normalize function's behavior is non-trivial, it is presented as
a separate patch on top of the basic http.<url>.* settings support.  A new test
for it has also been included as the final patch.  I am unclear on the proper
number for this test, but have gone ahead and put it with the other http tests
since this patch series places the url_normalize function into http.c.

Junio C Hamano (1):
  http.c: fix parsing of http.sslCertPasswordProtected variable

Kyle J. McKay (4):
  http.c: fix parsing of GIT_SSL_CERT_PASSWORD_PROTECTED variable
  config: add support for http.<url>.* settings
  config: improve support for http.<url>.* settings
  tests: add new test for the url_normalize function

 .gitignore               |   1 +
 Documentation/config.txt |  14 ++
 Makefile                 |   5 +
 http.c                   | 397 ++++++++++++++++++++++++++++++++++++++++++++---
 t/t5200-url-normalize.sh | 109 +++++++++++++
 test-url-normalize.c     |  62 ++++++++
 6 files changed, 565 insertions(+), 23 deletions(-)
 create mode 100755 t/t5200-url-normalize.sh
 create mode 100644 test-url-normalize.c

-- 
1.8.3

[PATCH v5 1/5] http.c: fix parsing of http.sslCertPasswordProtected variable

[Kyle J. McKay]

From: Junio C Hamano <gitster@pobox.com>

The existing code triggers only when the configuration variable is
set to true.  Once the variable is set to true in a more generic
configuration file (e.g. ~/.gitconfig), it cannot be overriden to
false in the repository specific one (e.g. .git/config).

Signed-off-by: Junio C Hamano <gitster@pobox.com>
---
 http.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/http.c b/http.c
index 2d086ae..e65661e 100644
--- a/http.c
+++ b/http.c
@@ -160,8 +160,7 @@ static int http_options(const char *var, const char *value, void *cb)
 	if (!strcmp("http.sslcainfo", var))
 		return git_config_string(&ssl_cainfo, var, value);
 	if (!strcmp("http.sslcertpasswordprotected", var)) {
-		if (git_config_bool(var, value))
-			ssl_cert_password_required = 1;
+		ssl_cert_password_required = git_config_bool(var, value);
 		return 0;
 	}
 	if (!strcmp("http.ssltry", var)) {
-- 
1.8.3

[PATCH v5 2/5] http.c: fix parsing of GIT_SSL_CERT_PASSWORD_PROTECTED variable

[Kyle J. McKay]

The existing code triggers whenever GIT_SSL_CERT_PASSWORD_PROTECTED
is defined.  Setting GIT_SSL_CERT_PASSWORD_PROTECTED to a false
value could not be used to override the http.sslCertPasswordProtected
setting once it had been turned on.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
---
 http.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/http.c b/http.c
index e65661e..9542a59 100644
--- a/http.c
+++ b/http.c
@@ -403,11 +403,10 @@ void http_init(struct remote *remote, const char *url, int proactive_auth)
 		curl_ftp_no_epsv = 1;
 
 	if (url) {
+		int pwdreq = git_env_bool("GIT_SSL_CERT_PASSWORD_PROTECTED", -1);
 		credential_from_url(&http_auth, url);
-		if (!ssl_cert_password_required &&
-		    getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
-		    !prefixcmp(url, "https://"))
-			ssl_cert_password_required = 1;
+		if (pwdreq != -1 && !prefixcmp(url, "https://"))
+			ssl_cert_password_required = pwdreq;
 	}
 
 #ifndef NO_CURL_EASY_DUPHANDLE
-- 
1.8.3

[PATCH v5 3/5] config: add support for http.<url>.* settings

[Kyle J. McKay]

The credentials configuration values already support url-specific
configuration items in the form credential.<url>.*.  This patch
adds similar support for http configuration values.

The <url> value is considered a match to a url if the <url> value
is either an exact match or a prefix of the url which ends on a
path component boundary ('/').  So "https://example.com/test" will
match "https://example.com/test" and "https://example.com/test/too"
but not "https://example.com/testextra".

Longer matches take precedence over shorter matches with
environment variable settings taking precedence over all.

With this configuration:

[http]
        useragent = other-agent
        noEPSV = true
[http "https://example.com"]
        useragent = example-agent
        sslVerify = false
[http "https://example.com/path"]
        useragent = path-agent

The "https://other.example.com/" url will have useragent
"other-agent" and sslVerify will be on.

The "https://example.com/" url will have useragent
"example-agent" and sslVerify will be off.

The "https://example.com/path/sub" url will have useragent
"path-agent" and sslVerify will be off.

All three of the examples will have noEPSV enabled.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
---
 Documentation/config.txt |  15 +++++
 http.c                   | 169 ++++++++++++++++++++++++++++++++++++++++++-----
 2 files changed, 167 insertions(+), 17 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index 81856dd..ceced99 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1531,6 +1531,21 @@ http.useragent::
 	of common USER_AGENT strings (but not including those like git/1.7.1).
 	Can be overridden by the 'GIT_HTTP_USER_AGENT' environment variable.
 
+http.<url>.*::
+	Any of the http.* options above can be applied selectively to some urls.
+	For example "http.https://example.com.useragent" would set the user
+	agent only for https connections to example.com.  The <url> value
+	matches a url if it is an exact match or a prefix of the url matching
+	at a "/" boundary.  Longer <url> matches take precedence over shorter
+	ones with the environment variable settings taking precedence over all.
+	Note that <url> must match the url passed to git exactly (other than
+	possibly being a prefix).  This means any user, password and/or port
+	setting that appears in a url as well as any %XX escapes that are
+	present must also appear in <url> to have a successful match.  The urls
+	that are matched against are those given directly to git commands.  In
+	other words, use exactly the same url that was passed to git (possibly
+	shortened) for the <url> value of the config setting.
+
 i18n.commitEncoding::
 	Character encoding the commit messages are stored in; Git itself
 	does not care per se, but this information is necessary e.g. when
diff --git a/http.c b/http.c
index 9542a59..758e5b1 100644
--- a/http.c
+++ b/http.c
@@ -30,6 +30,34 @@ static CURL *curl_default;
 
 char curl_errorstr[CURL_ERROR_SIZE];
 
+enum http_option_type {
+	OPT_POST_BUFFER,
+	OPT_MIN_SESSIONS,
+	OPT_SSL_VERIFY,
+	OPT_SSL_TRY,
+	OPT_SSL_CERT,
+	OPT_SSL_CAINFO,
+	OPT_LOW_SPEED,
+	OPT_LOW_TIME,
+	OPT_NO_EPSV,
+	OPT_HTTP_PROXY,
+	OPT_COOKIE_FILE,
+	OPT_USER_AGENT,
+	OPT_PASSWD_REQ,
+#ifdef USE_CURL_MULTI
+	OPT_MAX_REQUESTS,
+#endif
+#if LIBCURL_VERSION_NUM >= 0x070903
+	OPT_SSL_KEY,
+#endif
+#if LIBCURL_VERSION_NUM >= 0x070908
+	OPT_SSL_CAPATH,
+#endif
+	OPT_MAX
+};
+
+static size_t http_option_max_matched_len[OPT_MAX];
+
 static int curl_ssl_verify = -1;
 static int curl_ssl_try;
 static const char *ssl_cert;
@@ -141,33 +169,121 @@ static void process_curl_messages(void)
 }
 #endif
 
+static size_t http_options_url_match_prefix(const char *url,
+					    const char *url_prefix,
+					    size_t url_prefix_len)
+{
+	/*
+	 * url_prefix matches url if url_prefix is an exact match for url or it
+	 * is a prefix of url and the match ends on a path component boundary.
+	 * Both url and url_prefix are considered to have an implicit '/' on the
+	 * end for matching purposes if they do not already.
+	 *
+	 * url must be NUL terminated.  url_prefix_len is the length of
+	 * url_prefix which need not be NUL terminated.
+	 *
+	 * The return value is the length of the match in characters (excluding
+	 * any final '/') or 0 for no match.  Passing "/" as url_prefix will
+	 * always cause 0 to be returned.
+	 */
+	size_t url_len;
+	if (url_prefix_len && url_prefix[url_prefix_len - 1] == '/')
+		url_prefix_len--;
+	if (!url_prefix_len || strncmp(url, url_prefix, url_prefix_len))
+		return 0;
+	url_len = strlen(url);
+	if ((url_len == url_prefix_len) || (url[url_prefix_len] == '/'))
+		return url_prefix_len;
+	return 0;
+}
+
+static int new_match_is_shorter(size_t matchlen, enum http_option_type opt)
+{
+	/*
+	 * Compare matchlen to the last matched length of option opt and
+	 * return true if matchlen is shorter than the last matched length
+	 * (meaning the config setting should be ignored).  Upon seeing the
+	 * _same_ key (i.e. new key has the same match length which is therefore
+	 * not shorter) the new setting will override the previous setting.
+	 * Otherwise return false and record matchlen as the current last
+	 * matched length of option opt.
+	 */
+	if (matchlen < http_option_max_matched_len[opt])
+		return 1;
+	http_option_max_matched_len[opt] = matchlen;
+	return 0;
+}
+
 static int http_options(const char *var, const char *value, void *cb)
 {
-	if (!strcmp("http.sslverify", var)) {
+	const char *url = cb;
+	const char *key, *dot;
+	size_t matchlen = 0;
+
+	key = skip_prefix(var, "http.");
+	if (!key)
+		return git_default_config(var, value, cb);
+
+	/*
+	 * If the part following the leading "http." contains a '.' then check
+	 * to see if the part between "http." and the last '.' is a match to
+	 * url.  If it's not then ignore the setting.  Otherwise set key to
+	 * point to the option which is the part after the final '.' and
+	 * use key in subsequent comparisons to determine the option type.
+	 */
+	dot = strrchr(key, '.');
+	if (dot) {
+		matchlen = http_options_url_match_prefix(url, key, dot - key);
+		if (!matchlen)
+			return 0;
+		key = dot + 1;
+	}
+
+	if (!strcmp("sslverify", key)) {
+		if (new_match_is_shorter(matchlen, OPT_SSL_VERIFY))
+			return 0;
 		curl_ssl_verify = git_config_bool(var, value);
 		return 0;
 	}
-	if (!strcmp("http.sslcert", var))
+	if (!strcmp("sslcert", key)) {
+		if (new_match_is_shorter(matchlen, OPT_SSL_CERT))
+			return 0;
 		return git_config_string(&ssl_cert, var, value);
+	}
 #if LIBCURL_VERSION_NUM >= 0x070903
-	if (!strcmp("http.sslkey", var))
+	if (!strcmp("sslkey", key)) {
+		if (new_match_is_shorter(matchlen, OPT_SSL_KEY))
+			return 0;
 		return git_config_string(&ssl_key, var, value);
+	}
 #endif
 #if LIBCURL_VERSION_NUM >= 0x070908
-	if (!strcmp("http.sslcapath", var))
+	if (!strcmp("sslcapath", key)) {
+		if (new_match_is_shorter(matchlen, OPT_SSL_CAPATH))
+			return 0;
 		return git_config_string(&ssl_capath, var, value);
+	}
 #endif
-	if (!strcmp("http.sslcainfo", var))
+	if (!strcmp("sslcainfo", key)) {
+		if (new_match_is_shorter(matchlen, OPT_SSL_CAINFO))
+			return 0;
 		return git_config_string(&ssl_cainfo, var, value);
-	if (!strcmp("http.sslcertpasswordprotected", var)) {
+	}
+	if (!strcmp("sslcertpasswordprotected", key)) {
+		if (new_match_is_shorter(matchlen, OPT_PASSWD_REQ))
+			return 0;
 		ssl_cert_password_required = git_config_bool(var, value);
 		return 0;
 	}
-	if (!strcmp("http.ssltry", var)) {
+	if (!strcmp("ssltry", key)) {
+		if (new_match_is_shorter(matchlen, OPT_SSL_TRY))
+			return 0;
 		curl_ssl_try = git_config_bool(var, value);
 		return 0;
 	}
-	if (!strcmp("http.minsessions", var)) {
+	if (!strcmp("minsessions", key)) {
+		if (new_match_is_shorter(matchlen, OPT_MIN_SESSIONS))
+			return 0;
 		min_curl_sessions = git_config_int(var, value);
 #ifndef USE_CURL_MULTI
 		if (min_curl_sessions > 1)
@@ -176,39 +292,58 @@ static int http_options(const char *var, const char *value, void *cb)
 		return 0;
 	}
 #ifdef USE_CURL_MULTI
-	if (!strcmp("http.maxrequests", var)) {
+	if (!strcmp("maxrequests", key)) {
+		if (new_match_is_shorter(matchlen, OPT_MAX_REQUESTS))
+			return 0;
 		max_requests = git_config_int(var, value);
 		return 0;
 	}
 #endif
-	if (!strcmp("http.lowspeedlimit", var)) {
+	if (!strcmp("lowspeedlimit", key)) {
+		if (new_match_is_shorter(matchlen, OPT_LOW_SPEED))
+			return 0;
 		curl_low_speed_limit = (long)git_config_int(var, value);
 		return 0;
 	}
-	if (!strcmp("http.lowspeedtime", var)) {
+	if (!strcmp("lowspeedtime", key)) {
+		if (new_match_is_shorter(matchlen, OPT_LOW_TIME))
+			return 0;
 		curl_low_speed_time = (long)git_config_int(var, value);
 		return 0;
 	}
 
-	if (!strcmp("http.noepsv", var)) {
+	if (!strcmp("noepsv", key)) {
+		if (new_match_is_shorter(matchlen, OPT_NO_EPSV))
+			return 0;
 		curl_ftp_no_epsv = git_config_bool(var, value);
 		return 0;
 	}
-	if (!strcmp("http.proxy", var))
+	if (!strcmp("proxy", key)) {
+		if (new_match_is_shorter(matchlen, OPT_HTTP_PROXY))
+			return 0;
 		return git_config_string(&curl_http_proxy, var, value);
+	}
 
-	if (!strcmp("http.cookiefile", var))
+	if (!strcmp("cookiefile", key)) {
+		if (new_match_is_shorter(matchlen, OPT_COOKIE_FILE))
+			return 0;
 		return git_config_string(&curl_cookie_file, var, value);
+	}
 
-	if (!strcmp("http.postbuffer", var)) {
+	if (!strcmp("postbuffer", key)) {
+		if (new_match_is_shorter(matchlen, OPT_POST_BUFFER))
+			return 0;
 		http_post_buffer = git_config_int(var, value);
 		if (http_post_buffer < LARGE_PACKET_MAX)
 			http_post_buffer = LARGE_PACKET_MAX;
 		return 0;
 	}
 
-	if (!strcmp("http.useragent", var))
+	if (!strcmp("useragent", key)) {
+		if (new_match_is_shorter(matchlen, OPT_USER_AGENT))
+			return 0;
 		return git_config_string(&user_agent, var, value);
+	}
 
 	/* Fall back on the default ones */
 	return git_default_config(var, value, cb);
@@ -343,7 +478,7 @@ void http_init(struct remote *remote, const char *url, int proactive_auth)
 
 	http_is_verbose = 0;
 
-	git_config(http_options, NULL);
+	git_config(http_options, (void *)url);
 
 	curl_global_init(CURL_GLOBAL_ALL);
 
-- 
1.8.3

[PATCH v5 4/5] config: improve support for http.<url>.* settings

[Kyle J. McKay]

Improve on the http.<url>.* url matching behavior by first
normalizing the urls before they are compared.

With this change, for example, the following configuration
section:

[http "https://example.com/path"]
        useragent = example-agent
        sslVerify = false

will properly match a "HTTPS://example.COM/p%61th" url which
is equivalent.

The normalization rules are based on RFC 3986 and should
result in any two equivalent urls being a match.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
---
 Documentation/config.txt |  19 ++--
 http.c                   | 222 ++++++++++++++++++++++++++++++++++++++++++++++-
 2 files changed, 229 insertions(+), 12 deletions(-)

diff --git a/Documentation/config.txt b/Documentation/config.txt
index ceced99..98eee23 100644
--- a/Documentation/config.txt
+++ b/Documentation/config.txt
@@ -1535,16 +1535,15 @@ http.<url>.*::
 	Any of the http.* options above can be applied selectively to some urls.
 	For example "http.https://example.com.useragent" would set the user
 	agent only for https connections to example.com.  The <url> value
-	matches a url if it is an exact match or a prefix of the url matching
-	at a "/" boundary.  Longer <url> matches take precedence over shorter
-	ones with the environment variable settings taking precedence over all.
-	Note that <url> must match the url passed to git exactly (other than
-	possibly being a prefix).  This means any user, password and/or port
-	setting that appears in a url as well as any %XX escapes that are
-	present must also appear in <url> to have a successful match.  The urls
-	that are matched against are those given directly to git commands.  In
-	other words, use exactly the same url that was passed to git (possibly
-	shortened) for the <url> value of the config setting.
+	matches a url if it is an exact match or if it is a prefix of the url
+	matching at a "/" boundary.  Longer <url> matches take precedence over
+	shorter ones with the environment variable settings taking precedence
+	over all.  The urls are normalized before testing for a match.  Note,
+	however, that any user, password and/or port setting that appears in a
+	url must also match that part of <url> to have a successful match.  The
+	urls that are matched against are those given directly to git commands.
+	This means any urls visited as a result of a redirection do not
+	participate in matching.
 
 i18n.commitEncoding::
 	Character encoding the commit messages are stored in; Git itself
diff --git a/http.c b/http.c
index 758e5b1..d04386e 100644
--- a/http.c
+++ b/http.c
@@ -169,6 +169,210 @@ static void process_curl_messages(void)
 }
 #endif
 
+#define URL_ALPHA "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz"
+#define URL_DIGIT "0123456789"
+#define URL_HEXDIGIT URL_DIGIT "ABCDEFabcdef"
+#define URL_ALPHADIGIT URL_ALPHA URL_DIGIT
+#define URL_SCHEME_CHARS URL_ALPHADIGIT "+.-"
+#define URL_HOST_CHARS URL_ALPHADIGIT ".-[:]" /* IPv6 literals need [:] */
+#define URL_UNSAFE_CHARS " <>\"%{}|\\^`" /* plus 0x00-0x1F,0x7F-0xFF */
+#define URL_GEN_RESERVED ":/?#[]@"
+#define URL_SUB_RESERVED "!$&'()*+,;="
+#define URL_RESERVED URL_GEN_RESERVED URL_SUB_RESERVED /* only allowed delims */
+
+static int hex_digit_value(int ch)
+{
+	/*
+	 * Returns the hexadecimal digit value (0x00..0x0F) of character ch.
+	 * If ch is not a hexadecimal digit, the return value is undefined.
+	 */
+
+	if ('0' <= ch && ch <= '9')
+		return ch - '0';
+	return toupper(ch) - 'A' + 10;
+}
+
+static int append_normalized_escapes(struct strbuf *buf,
+				     const char *from,
+				     size_t from_len,
+				     const char *esc_extra,
+				     const char *esc_ok)
+{
+	/*
+	 * Append to strbuf buf characters from string from with length from_len
+	 * while unescaping characters that do not need to be escaped and
+	 * escaping characters that do.  The set of characters to escape (the
+	 * complement of which is unescaped) starts out as the RFC 3986 unsafe
+	 * characters (0x00-0x1F,0x7F-0xFF," <>\"#%{}|\\^`").  If esc_extra
+	 * is not NULL, those additional characters will also always be escaped.
+	 * If esc_ok is not NULL, those characters will be left escaped if found
+	 * that way, but will not be unescaped otherwise (used for delimiters).
+	 * If a %-escape sequence is encountered that is not followed by 2
+	 * hexadecimal digits, the sequence is invalid and false (0) will be
+	 * returned.  Otherwise true (1) will be returned for success.
+	 *
+	 * Note that all %-escape sequences will be normalized to UPPERCASE
+	 * as indicated in RFC 3986.  Unless included in esc_extra or esc_ok
+	 * alphanumerics and "-._~" will always be unescaped as per RFC 3986.
+	 */
+
+	while (from_len) {
+		int ch = *from++;
+		int was_esc = 0;
+
+		from_len--;
+		if (ch == '%') {
+			if (from_len < 2 ||
+			    !strchr(URL_HEXDIGIT, from[0]) ||
+			    !strchr(URL_HEXDIGIT, from[1]))
+				return 0;
+			ch = hex_digit_value(*from++) << 4;
+			ch |= hex_digit_value(*from++);
+			from_len -= 2;
+			was_esc = 1;
+		}
+		if (ch <= 0x1F || ch >= 0x7F || strchr(URL_UNSAFE_CHARS, ch) ||
+		    (esc_extra && strchr(esc_extra, ch)) ||
+		    (was_esc && strchr(esc_ok, ch)))
+			strbuf_addf(buf, "%%%02X", ch);
+		else
+			strbuf_addch(buf, ch);
+	}
+
+	return 1;
+}
+
+static char *http_options_url_normalize(const char *url, size_t *out_len)
+{
+	/*
+	 * Normalize NUL-terminated url using the following rules:
+	 *
+	 * 1. Case-insensitive parts of url will be converted to lower case
+	 * 2. %-encoded characters that do not need to be will be unencoded
+	 * 3. Characters that are not %-encoded and must be will be encoded
+	 * 4. All %-encodings will be converted to upper case hexadecimal
+	 * 5. If the default port for the scheme is given it will be removed
+	 * 6. If the user:password part is given and empty it will be removed
+	 * 7. A path part (including empty) not starting with '/' has one added
+	 * 8. IPv6 host literals are allowed (but not normalized or validated)
+	 *
+	 * The rules are based on information in RFC 3986.
+	 *
+	 * Please note this function requires a full URL including a scheme
+	 * and host part (except for file: URLs which may have an empty host).
+	 *
+	 * The return value is a newly allocated string that must be freed
+	 * or NULL if the url is not valid.
+	 *
+	 * If a non-NULL value is returned and out_len is not NULL then the
+	 * length of the result will be stored in *out_len.
+	 *
+	 * This is NOT a URL validation function.  Full URL validation is NOT
+	 * performed.  Some invalid host names are passed through this function
+	 * undetected.  Invalid port numbers may also be passed through
+	 * undetected.  However, most all other problems that make a URL invalid
+	 * will be detected (including a missing host for non file: URLs).
+	 */
+
+	size_t url_len = strlen(url);
+	struct strbuf norm;
+	size_t spanned;
+	const char *slash_ptr, *at_ptr, *colon_ptr;
+
+	/* Copy lowercased scheme and :// suffix, %-escapes are not allowed */
+	spanned = strspn(url, URL_SCHEME_CHARS);
+	if (!spanned || spanned + 3 > url_len || url[spanned] != ':' ||
+	    url[spanned+1] != '/' || url[spanned+2] != '/')
+		return NULL; /* Bad scheme and/or missing "://" part */
+	strbuf_init(&norm, url_len);
+	spanned += 3;
+	url_len -= spanned;
+	while (spanned--)
+		strbuf_addch(&norm, tolower(*url++));
+
+	/* Copy any username:password if present normalizing %-escapes */
+	at_ptr = strchr(url, '@');
+	slash_ptr = url + strcspn(url, "/?#");
+	if (at_ptr && at_ptr < slash_ptr) {
+		if (at_ptr > url) {
+			if (!append_normalized_escapes(&norm, url, at_ptr - url,
+						       "", URL_RESERVED)) {
+				strbuf_release(&norm);
+				return NULL;
+			}
+			strbuf_addch(&norm, '@');
+		}
+		url_len -= (++at_ptr - url);
+		url = at_ptr;
+	}
+
+	/* Copy the host part excluding any port part, no %-escapes allowed */
+	if (!url_len || strchr(":/?#", *url)) {
+		/* Missing host invalid for all URL schemes except file */
+		if (strncmp(norm.buf, "file:", 5)) {
+			strbuf_release(&norm);
+			return NULL;
+		}
+	}
+	colon_ptr = slash_ptr - 1;
+	while (colon_ptr > url && *colon_ptr != ':' && *colon_ptr != ']')
+		colon_ptr--;
+	if (*colon_ptr != ':')
+		colon_ptr = slash_ptr;
+	spanned = strspn(url, URL_HOST_CHARS);
+	if (spanned < colon_ptr - url) {
+		/* Host name has invalid characters */
+		strbuf_release(&norm);
+		return NULL;
+	}
+	while (url < colon_ptr) {
+		strbuf_addch(&norm, tolower(*url++));
+		url_len--;
+	}
+
+	/* Check the port part and copy if not the default, no %-escapes */
+	if (colon_ptr < slash_ptr) {
+		if (colon_ptr + 1 == slash_ptr) {
+			/* Skip ":" port with no number, it's same as default */
+		} else if (slash_ptr - colon_ptr == 3 &&
+			   !strncmp(norm.buf, "http:", 5) &&
+			   !strncmp(url, ":80", 3)) {
+			/* Skip http :80 as it's the default */
+		} else if (slash_ptr - colon_ptr == 4 &&
+			   !strncmp(norm.buf, "https:", 6) &&
+			   !strncmp(url, ":443", 4)) {
+			/* Skip https :443 as it's the default */
+		} else {
+			/* Port number must be all digits */
+			spanned = strspn(url + 1, URL_DIGIT);
+			if (spanned + 1 < slash_ptr - colon_ptr) {
+				/* port number has invalid characters */
+				strbuf_release(&norm);
+				return NULL;
+			}
+			strbuf_add(&norm, url, slash_ptr - colon_ptr);
+		}
+		url_len -= slash_ptr - colon_ptr;
+		url = slash_ptr;
+	}
+
+	/*
+	 * Now simply copy the rest, if any, only normalizing %-escapes and
+	 * being careful to not corrupt the URL by unescaping any delimiters,
+	 * but do add an initial '/' if it's missing
+	 */
+	if (*url != '/')
+		strbuf_addch(&norm, '/');
+	if (*url) {
+		if (!append_normalized_escapes(&norm, url, url_len, "", URL_RESERVED)) {
+			strbuf_release(&norm);
+			return NULL;
+		}
+	}
+
+	return strbuf_detach(&norm, out_len);
+}
+
 static size_t http_options_url_match_prefix(const char *url,
 					    const char *url_prefix,
 					    size_t url_prefix_len)
@@ -185,8 +389,13 @@ static size_t http_options_url_match_prefix(const char *url,
 	 * The return value is the length of the match in characters (excluding
 	 * any final '/') or 0 for no match.  Passing "/" as url_prefix will
 	 * always cause 0 to be returned.
+	 *
+	 * Passing NULL as url and/or url_prefix will always cause 0 to be
+	 * returned without causing any faults.
 	 */
 	size_t url_len;
+	if (!url || !url_prefix)
+		return 0;
 	if (url_prefix_len && url_prefix[url_prefix_len - 1] == '/')
 		url_prefix_len--;
 	if (!url_prefix_len || strncmp(url, url_prefix, url_prefix_len))
@@ -233,7 +442,14 @@ static int http_options(const char *var, const char *value, void *cb)
 	 */
 	dot = strrchr(key, '.');
 	if (dot) {
-		matchlen = http_options_url_match_prefix(url, key, dot - key);
+		char *config_url = xmemdupz(key, dot - key);
+		size_t norm_url_len;
+		char *norm_url = http_options_url_normalize(config_url, &norm_url_len);
+		free(config_url);
+		if (!norm_url)
+			return 0;
+		matchlen = http_options_url_match_prefix(url, norm_url, norm_url_len);
+		free(norm_url);
 		if (!matchlen)
 			return 0;
 		key = dot + 1;
@@ -475,10 +691,12 @@ void http_init(struct remote *remote, const char *url, int proactive_auth)
 {
 	char *low_speed_limit;
 	char *low_speed_time;
+	char *norm_url = http_options_url_normalize(url, NULL);
 
 	http_is_verbose = 0;
 
-	git_config(http_options, (void *)url);
+	git_config(http_options, norm_url);
+	free(norm_url);
 
 	curl_global_init(CURL_GLOBAL_ALL);
 
-- 
1.8.3

Re: [PATCH v5 4/5] config: improve support for http.<url>.* settings

[Eric Sunshine]

On Mon, Jul 15, 2013 at 5:51 AM, Kyle J. McKay <mackyle@gmail.com> wrote:
> Improve on the http.<url>.* url matching behavior by first
> normalizing the urls before they are compared.
>
> diff --git a/http.c b/http.c
> index 758e5b1..d04386e 100644
> --- a/http.c
> +++ b/http.c
> @@ -169,6 +169,210 @@ static void process_curl_messages(void)
>  }
>  #endif
>
> +static int append_normalized_escapes(struct strbuf *buf,
> +                                    const char *from,
> +                                    size_t from_len,
> +                                    const char *esc_extra,
> +                                    const char *esc_ok)
> +{
> +       /*
> +        * Append to strbuf buf characters from string from with length from_len

s/from string from/from string/

> +        * while unescaping characters that do not need to be escaped and
> +        * escaping characters that do.  The set of characters to escape (the
> +        * complement of which is unescaped) starts out as the RFC 3986 unsafe
> +        * characters (0x00-0x1F,0x7F-0xFF," <>\"#%{}|\\^`").  If esc_extra
> +        * is not NULL, those additional characters will also always be escaped.
> +        * If esc_ok is not NULL, those characters will be left escaped if found
> +        * that way, but will not be unescaped otherwise (used for delimiters).
> +        * If a %-escape sequence is encountered that is not followed by 2
> +        * hexadecimal digits, the sequence is invalid and false (0) will be
> +        * returned.  Otherwise true (1) will be returned for success.
> +        *
> +        * Note that all %-escape sequences will be normalized to UPPERCASE
> +        * as indicated in RFC 3986.  Unless included in esc_extra or esc_ok
> +        * alphanumerics and "-._~" will always be unescaped as per RFC 3986.
> +        */

Re: [PATCH v5 4/5] config: improve support for http.<url>.* settings

[Kyle J. McKay]

On Jul 15, 2013, at 16:12, Eric Sunshine wrote:
> On Mon, Jul 15, 2013 at 5:51 AM, Kyle J. McKay <mackyle@gmail.com>  
> wrote:
>> +static int append_normalized_escapes(struct strbuf *buf,
>> +                                    const char *from,
>> +                                    size_t from_len,
>> +                                    const char *esc_extra,
>> +                                    const char *esc_ok)
>> +{
>> +       /*
>> +        * Append to strbuf buf characters from string from with  
>> length from_len
>
> s/from string from/from string/

Hmmm.  Actually it's meant to say "from string <parameter with name  
from>".

Do quotes make it read better:

   from string `from'

Or do you think it needs to be:

   from string parameter `from'

Re: [PATCH v5 4/5] config: improve support for http.<url>.* settings

[Eric Sunshine]

On Tue, Jul 16, 2013 at 5:53 AM, Kyle J. McKay <mackyle@gmail.com> wrote:
> On Jul 15, 2013, at 16:12, Eric Sunshine wrote:
>>
>> On Mon, Jul 15, 2013 at 5:51 AM, Kyle J. McKay <mackyle@gmail.com> wrote:
>>>
>>> +static int append_normalized_escapes(struct strbuf *buf,
>>> +                                    const char *from,
>>> +                                    size_t from_len,
>>> +                                    const char *esc_extra,
>>> +                                    const char *esc_ok)
>>> +{
>>> +       /*
>>> +        * Append to strbuf buf characters from string from with length
>>> from_len
>>
>>
>> s/from string from/from string/
>
> Hmmm.  Actually it's meant to say "from string <parameter with name from>".
>
> Do quotes make it read better:
>
>   from string `from'
>
> Or do you think it needs to be:
>
>   from string parameter `from'

Ah, I see now. Thanks for clarifying. Quoting 'from' (and the other
arguments) probably would make it sufficiently readable.

[PATCH v5 5/5] tests: add new test for the url_normalize function

[Kyle J. McKay]

In order to perform sane URL matching for http.<url>.* options,
http.c normalizes URLs before performing matches.

A new test-url-normalize test program is introduced along with
a new t5200-url-normalize.sh script to run the tests.

Since the url_normalize function currently lives in http.c this
test will be skipped if NO_CURL is defined since http.c is skipped
in that case.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
---
 .gitignore               |   1 +
 Makefile                 |   5 +++
 t/t5200-url-normalize.sh | 109 +++++++++++++++++++++++++++++++++++++++++++++++
 test-url-normalize.c     |  62 +++++++++++++++++++++++++++
 4 files changed, 177 insertions(+)
 create mode 100755 t/t5200-url-normalize.sh
 create mode 100644 test-url-normalize.c

diff --git a/.gitignore b/.gitignore
index efa8db0..b60a9df 100644
--- a/.gitignore
+++ b/.gitignore
@@ -201,6 +201,7 @@
 /test-string-list
 /test-subprocess
 /test-svn-fe
+/test-url-normalize
 /test-wildmatch
 /common-cmds.h
 *.tar.gz
diff --git a/Makefile b/Makefile
index 0600eb4..195c62a 100644
--- a/Makefile
+++ b/Makefile
@@ -580,6 +580,7 @@ TEST_PROGRAMS_NEED_X += test-sigchain
 TEST_PROGRAMS_NEED_X += test-string-list
 TEST_PROGRAMS_NEED_X += test-subprocess
 TEST_PROGRAMS_NEED_X += test-svn-fe
+TEST_PROGRAMS_NEED_X += test-url-normalize
 TEST_PROGRAMS_NEED_X += test-wildmatch
 
 TEST_PROGRAMS = $(patsubst %,%$X,$(TEST_PROGRAMS_NEED_X))
@@ -2278,6 +2279,10 @@ test-parse-options$X: parse-options.o parse-options-cb.o
 
 test-svn-fe$X: vcs-svn/lib.a
 
+test-url-normalize$X: test-url-normalize.o GIT-LDFLAGS $(GITLIBS)
+	$(QUIET_LINK)$(CC) $(ALL_CFLAGS) -o $@ $(ALL_LDFLAGS) $(filter %.o,$^) \
+		$(LIBS) $(CURL_LIBCURL) $(EXPAT_LIBEXPAT)
+
 .PRECIOUS: $(TEST_OBJS)
 
 test-%$X: test-%.o GIT-LDFLAGS $(GITLIBS)
diff --git a/t/t5200-url-normalize.sh b/t/t5200-url-normalize.sh
new file mode 100755
index 0000000..40ebcd3
--- /dev/null
+++ b/t/t5200-url-normalize.sh
@@ -0,0 +1,109 @@
+#!/bin/sh
+
+test_description='url normalization'
+. ./test-lib.sh
+
+if test -n "$NO_CURL"; then
+	skip_all='skipping test, git built without http support'
+	test_done
+fi
+
+# Note that only file: URLs should be allowed without a host
+
+test_expect_success 'url scheme' '
+	! test-url-normalize "" &&
+	! test-url-normalize "_" &&
+	! test-url-normalize "scheme" &&
+	! test-url-normalize "scheme:" &&
+	! test-url-normalize "scheme:/" &&
+	! test-url-normalize "scheme://" &&
+	! test-url-normalize "file" &&
+	! test-url-normalize "file:" &&
+	! test-url-normalize "file:/" &&
+	test-url-normalize "file://" &&
+	! test-url-normalize "://acme.co" &&
+	! test-url-normalize "x_test://acme.co" &&
+	! test-url-normalize "schem%6e://" &&
+	test-url-normalize "x-Test+v1.0://acme.co" &&
+	test "$(test-url-normalize -p "AbCdeF://x.Y")" = "abcdef://x.y/"
+'
+
+test_expect_success 'url authority' '
+	! test-url-normalize "scheme://user:pass@" &&
+	! test-url-normalize "scheme://?" &&
+	! test-url-normalize "scheme://#" &&
+	! test-url-normalize "scheme:///" &&
+	! test-url-normalize "scheme://:" &&
+	! test-url-normalize "scheme://:555" &&
+	test-url-normalize "file://user:pass@" &&
+	test-url-normalize "file://?" &&
+	test-url-normalize "file://#" &&
+	test-url-normalize "file:///" &&
+	test-url-normalize "file://:" &&
+	test-url-normalize "file://:555" &&
+	test-url-normalize "scheme://user:pass@host" &&
+	test-url-normalize "scheme://@host" &&
+	test-url-normalize "scheme://%00@host" &&
+	! test-url-normalize "scheme://%%@host" &&
+	! test-url-normalize "scheme://host_" &&
+	test-url-normalize "scheme://user:pass@host/" &&
+	test-url-normalize "scheme://@host/" &&
+	test-url-normalize "scheme://host/" &&
+	test-url-normalize "scheme://host?x" &&
+	test-url-normalize "scheme://host#x" &&
+	test-url-normalize "scheme://host/@" &&
+	test-url-normalize "scheme://host?@x" &&
+	test-url-normalize "scheme://host#@x" &&
+	test-url-normalize "scheme://[::1]" &&
+	test-url-normalize "scheme://[::1]/" &&
+	! test-url-normalize "scheme://hos%41/" &&
+	test-url-normalize "scheme://[invalid....:/" &&
+	test-url-normalize "scheme://invalid....:]/" &&
+	! test-url-normalize "scheme://invalid....:[/" &&
+	! test-url-normalize "scheme://invalid....:["
+'
+
+test_expect_success 'url port' '
+	test-url-normalize "xyz://q@some.host:" &&
+	test-url-normalize "xyz://q@some.host:456" &&
+	test-url-normalize "xyz://q@some.host:0" &&
+	test-url-normalize "xyz://q@some.host:99999" &&
+	test-url-normalize "http://q@some.host:80" &&
+	test-url-normalize "https://q@some.host:443"
+	! test-url-normalize "http://q@:8008" &&
+	! test-url-normalize "http://:8080" &&
+	! test-url-normalize "http://:" &&
+	test-url-normalize "xyz://q@some.host:456/" &&
+	test-url-normalize "xyz://[::1]:456/" &&
+	test-url-normalize "xyz://[::1]:/" &&
+	test-url-normalize "xyz://[::1]:000/" &&
+	! test-url-normalize "xyz://[::1]:0%300/" &&
+	! test-url-normalize "xyz://[::1]:030f/"
+'
+
+test_expect_success 'url general escapes' '
+	! test-url-normalize "http://x.y?%fg" &&
+	test "$(test-url-normalize -p "X://W/%7e%41^%3a")" = "x://w/~A%5E%3A" &&
+	test "$(test-url-normalize -p "X://W/:/?#[]@")" = "x://w/:/?#[]@" &&
+	test "$(test-url-normalize -p "X://W/$&()*+,;=")" = "x://w/$&()*+,;=" &&
+	test "$(test-url-normalize -p "X://W/'\''")" = "x://w/'\''" &&
+	test "$(test-url-normalize -p "X://W?'\!'")" = "x://w/?'\!'"
+';#'
+
+test_expect_success 'url username/password escapes' '
+	test "$(test-url-normalize -p "x://%41%62(^):%70+d@foo")" = "x://Ab(%5E):p+d@foo/"
+'
+
+test_expect_success 'url normalized lengths' '
+	test "$(test-url-normalize -l "Http://%4d%65:%4d^%70@The.Host")" = 25 &&
+	test "$(test-url-normalize -l "http://%41:%42@x.y/%61/")" = 17 &&
+	test "$(test-url-normalize -l "http://@x.y/^")" = 14
+'
+
+test_expect_success 'url equivalents' '
+	test-url-normalize "httP://x" "Http://X/" &&
+	test-url-normalize "Http://%4d%65:%4d^%70@The.Host" "hTTP://Me:%4D^p@the.HOST:80/" &&
+	test-url-normalize "https://@x.y/^" "httpS://x.y:443/^"
+'
+
+test_done
diff --git a/test-url-normalize.c b/test-url-normalize.c
new file mode 100644
index 0000000..1872964
--- /dev/null
+++ b/test-url-normalize.c
@@ -0,0 +1,62 @@
+#ifdef NO_CURL
+
+int main()
+{
+	return 125;
+}
+
+#else /* !NO_CURL */
+
+#include "http.c"
+
+#define url_normalize(u,s) http_options_url_normalize(u,s)
+
+int main(int argc, char **argv)
+{
+	const char *usage = "test-url-normalize [-p | -l] <url1> | <url1> <url2>";
+	char *url1, *url2;
+	int opt_p = 0, opt_l = 0;
+
+	/*
+	 * For one url, succeed if url_normalize succeeds on it, fail otherwise.
+	 * For two urls, succeed only if url_normalize succeeds on both and
+	 * the results compare equal with strcmp.  If -p is given (one url only)
+	 * and url_normalize succeeds, print the result followed by "\n".  If
+	 * -l is given (one url only) and url_normalize succeeds, print the
+	 * returned length in decimal followed by "\n".
+	 */
+
+	if (argc > 1 && !strcmp(argv[1], "-p")) {
+		opt_p = 1;
+		argc--;
+		argv++;
+	} else if (argc > 1 && !strcmp(argv[1], "-l")) {
+		opt_l = 1;
+		argc--;
+		argv++;
+	}
+
+	if (argc < 2 || argc > 3)
+		die(usage);
+
+	if (argc == 2) {
+		size_t s;
+		url1 = url_normalize(argv[1], &s);
+		if (!url1)
+			return 1;
+		if (opt_p)
+			printf("%s\n", url1);
+		if (opt_l)
+			printf("%u\n", (unsigned)s);
+		return 0;
+	}
+
+	if (opt_p || opt_l)
+		die(usage);
+
+	url1 = url_normalize(argv[1], NULL);
+	url2 = url_normalize(argv[2], NULL);
+	return (url1 && url2 && !strcmp(url1, url2)) ? 0 : 1;
+}
+
+#endif /* !NO_CURL */
-- 
1.8.3