threads / patch / 34421

patchhttp.c: fix parsing of http.sslCertPasswordProtected variable

Subject: [PATCH] http.c: fix parsing of http.sslCertPasswordProtected variable

## tl;dr

8 messages between Jul 12, 2013 and Jul 15, 2013. Diffs are folded; open one to read it.

replies: 7people: 4as markdown or json

Junio C Hamano· Jul 12, 2013, 18:52 UTC · lore

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(-)
Show changes to http.c +1 −2
diff --git a/http.c b/http.c
index 92aba59..37986f8 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)) {

-- 
1.8.3.2-942-gc84dfcb
Jonathan Nieder· Jul 12, 2013, 19:05 UTC · re: Junio C Hamano · lore

Re: [PATCH] http.c: fix parsing of http.sslCertPasswordProtected variable

Junio C Hamano wrote:
> 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).
[...]
Show 9 quoted lines
> --- 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);

Thanks for catching it. The documentation doesn't say anything about this "can only enable and cannot disable" behavior and the usual pattern is to allow later settings to override earlier ones, so this change looks good.

Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>

FWIW the GIT_SSL_CERT_PASSWORD_PROTECTED envvar has a similar "can only enable" behavior, but since it's documented, that's not as big of a problem. Do you remember why it was written that way?

When that setting was first added[1], there was some mention of autodetection if libcurl could learn to do that. Did it happen? (Please forgive my ignorance.)

Thanks, Jonathan

[1] http://thread.gmane.org/gmane.comp.version-control.git/122793/focus=122816
Junio C Hamano· Jul 12, 2013, 19:52 UTC · re: Jonathan Nieder · lore

Re: [PATCH] http.c: fix parsing of http.sslCertPasswordProtected variable

Jonathan Nieder <jrnieder@gmail.com> writes:
> FWIW the GIT_SSL_CERT_PASSWORD_PROTECTED envvar has a similar "can
> only enable" behavior, but since it's documented, that's not as big
> of a problem.  Do you remember why it was written that way?
Not me ;-).

If I have to guess, it is probably that these two are thought to be equally trivial way to defeat existing environment settings:

	(unset GIT_SSL_CERT_PASSWORD_PROTECTED ; git cmd)
        GIT_SSL_CERT_PASSWORD_PROTECTED=no git cmd
> When that setting was first added[1], there was some mention of
> autodetection if libcurl could learn to do that.  Did it happen?

I do not think so, but let's see if our resident cURL guru has something to say about it.

Mark Lodato· Jul 14, 2013, 00:37 UTC · re: Junio C Hamano · lore

Re: [PATCH] http.c: fix parsing of http.sslCertPasswordProtected variable

On Fri, Jul 12, 2013 at 3:52 PM, Junio C Hamano <gitster@pobox.com> wrote:
Show 8 quoted lines
>
> Jonathan Nieder <jrnieder@gmail.com> writes:
>
> > FWIW the GIT_SSL_CERT_PASSWORD_PROTECTED envvar has a similar "can
> > only enable" behavior, but since it's documented, that's not as big
> > of a problem.  Do you remember why it was written that way?
>
> Not me ;-).

Because that's how GIT_NO_VERIFY, GIT_CURL_FTP_NO_EPSV, and GIT_CURL_VERBOSE (and perhaps others) work. That said, I agree that parsing the variable's value as a boolean would make much more sense. Perhaps this is how all of those variables should work?

Show 5 quoted lines
> > When that setting was first added[1], there was some mention of
> > autodetection if libcurl could learn to do that.  Did it happen?
>
> I do not think so, but let's see if our resident cURL guru has
> something to say about it.

I tried back in 2009 but eventually gave up, so unfortunately no. Maybe the situation in libcurl has changed since then? (If you are interested in pursing this, please let me know and I can give you the details of what I tried.)

Junio C Hamano· Jul 15, 2013, 04:13 UTC · re: Mark Lodato · lore

Re: [PATCH] http.c: fix parsing of http.sslCertPasswordProtected variable

Mark Lodato <lodatom@gmail.com> writes:
Show 11 quoted lines
> On Fri, Jul 12, 2013 at 3:52 PM, Junio C Hamano <gitster@pobox.com> wrote:
>>
>> Jonathan Nieder <jrnieder@gmail.com> writes:
>>
>> > FWIW the GIT_SSL_CERT_PASSWORD_PROTECTED envvar has a similar "can
>> > only enable" behavior, but since it's documented, that's not as big
>> > of a problem.  Do you remember why it was written that way?
>>
>> Not me ;-).
>
> Because that's how GIT_NO_VERIFY, GIT_CURL_FTP_NO_EPSV, and
s/GIT_NO_VERIFY/GIT_SSL_NO_VERIFY/, I think.
> GIT_CURL_VERBOSE (and perhaps others) work.  That said, I agree that
> parsing the variable's value as a boolean would make much more sense.
> Perhaps this is how all of those variables should work?
I think you are probably right.
Kyle J. McKay· Jul 15, 2013, 06:37 UTC · re: Junio C Hamano · lore

Re: [PATCH] http.c: fix parsing of http.sslCertPasswordProtected variable

On Jul 14, 2013, at 21:13, Junio C Hamano wrote:
Show 22 quoted lines
> Mark Lodato <lodatom@gmail.com> writes:
>
>> On Fri, Jul 12, 2013 at 3:52 PM, Junio C Hamano <gitster@pobox.com>  
>> wrote:
>>>
>>> Jonathan Nieder <jrnieder@gmail.com> writes:
>>>
>>>> FWIW the GIT_SSL_CERT_PASSWORD_PROTECTED envvar has a similar "can
>>>> only enable" behavior, but since it's documented, that's not as big
>>>> of a problem.  Do you remember why it was written that way?
>>>
>>> Not me ;-).
>>
>> Because that's how GIT_NO_VERIFY, GIT_CURL_FTP_NO_EPSV, and
>
> s/GIT_NO_VERIFY/GIT_SSL_NO_VERIFY/, I think.
>
>> GIT_CURL_VERBOSE (and perhaps others) work.  That said, I agree that
>> parsing the variable's value as a boolean would make much more sense.
>> Perhaps this is how all of those variables should work?
>
> I think you are probably right.

That works fine for GIT_SSL_CERT_PASSWORD_PROTECTED and GIT_CURL_VERBOSE, but it's a little bit awkward for GIT_SSL_NO_VERIFY and GIT_CURL_FTP_NO_EPSV since they have "_NO_" in their names.

If the user wants to override a "http.sslVerify=false" then "GIT_SSL_NO_VERIFY=false" is needed rather than "GIT_SSL_VERIFY=true".

We could:
1) Introduce GIT_SSL_VERIFY and GIT_CURL_FTP_EPSV and say if they are  
set the "_NO_" version is ignored.
2) Go ahead with "GIT_SSL_NO_VERIFY=false" to force http.sslVerify  
back to true (and similarly for EPSV).
3) Just leave GIT_SSL_NO_VERIFY and GIT_CURL_FTP_NO_EPSV alone.
4) Do something else, ideas?
Comments?
Junio C Hamano· Jul 15, 2013, 15:54 UTC · re: Kyle J. McKay · lore

Re: [PATCH] http.c: fix parsing of http.sslCertPasswordProtected variable

"Kyle J. McKay" <mackyle@gmail.com> writes:
Show 20 quoted lines
> That works fine for GIT_SSL_CERT_PASSWORD_PROTECTED and
> GIT_CURL_VERBOSE, but it's a little bit awkward for GIT_SSL_NO_VERIFY
> and GIT_CURL_FTP_NO_EPSV since they have "_NO_" in their names.
>
> If the user wants to override a "http.sslVerify=false" then
> "GIT_SSL_NO_VERIFY=false" is needed rather than "GIT_SSL_VERIFY=true".
>
> We could:
>
> 1) Introduce GIT_SSL_VERIFY and GIT_CURL_FTP_EPSV and say if they are
> set the "_NO_" version is ignored.
>
> 2) Go ahead with "GIT_SSL_NO_VERIFY=false" to force http.sslVerify
> back to true (and similarly for EPSV).
>
> 3) Just leave GIT_SSL_NO_VERIFY and GIT_CURL_FTP_NO_EPSV alone.
>
> 4) Do something else, ideas?
>
> Comments?
The usual way we have done this kind of thing so far is:
 (1) Add GIT_SSL_VERIFY and GIT_CURL_FTP_EPSV support, that is
     boolean.  If that is set, it takes precedence to
     GIT_SSL_NO_VERIFY and GIT_CURL_FTP_NO_EPSV.  If not,
     GIT_SSL_NO_VERIFY and GIT_CURL_FTP_NO_EPSV are used just like
     before (setting it to any value will decline VERIFY or EPSV).
 (2) Issue a warning to tell users to use GIT_SSL_VERIFY or
     GIT_CURL_FTP_EPSV instead, when GIT_SSL_NO_VERIFY and
     GIT_CURL_FTP_NO_EPSV are used.
 (3) Later at a large version bump, remove support for *_NO_*
     variants.

We can stop at (1) and not do (2) and (3), if the resulting code after (1) is not too cumbersome to maintain. If we do (2) then we must follow it through with (3), and if we plan to do (3) then we must precede it with (2).

Kyle J. McKay· Jul 13, 2013, 19:28 UTC · re: Jonathan Nieder · lore

Re: [PATCH] http.c: fix parsing of http.sslCertPasswordProtected variable

On Jul 12, 2013, at 12:05, Jonathan Nieder wrote:
Show 24 quoted lines
> Junio C Hamano wrote:
>
>> 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).
> [...]
>> --- 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);
>
> Thanks for catching it.  The documentation doesn't say anything about
> this "can only enable and cannot disable" behavior and the usual
> pattern is to allow later settings to override earlier ones, so this
> change looks good.
>
> Reviewed-by: Jonathan Nieder <jrnieder@gmail.com>
Looks good to me too.
> FWIW the GIT_SSL_CERT_PASSWORD_PROTECTED envvar has a similar "can
> only enable" behavior, but since it's documented, that's not as big
> of a problem.
Hmmm.  git help config says:
> Can be overridden by the GIT_SSL_CERT_PASSWORD_PROTECTED environment
> variable.

in the http.sslCertPasswordProtected section of the help. It doesn't say it can only be overridden to on. Is there some other documentation for that somewhere I'm missing about being can-only-enable?

If not, perhaps a change something like the following could be added to the patch:

Show changes to http.c +3 −4
diff --git a/http.c b/http.c
index 2d086ae..83fc6b4 100644
--- a/http.c
+++ b/http.c
@@ -404,11 +404,10 @@ 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

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