On Fri, Oct 19, 2018 at 6:15 AM Steffen <i...@apachelounge.com> wrote:
> I changed the subject ( was Re: svn commit: r1748461 - in > /httpd/httpd/branches/2.2.x: ./ CHANGES support/ab.c) > > William A Rowe Jr wrote: ...mod_php or other weirdness .... > > What do you mean by weirdness ? Google translate shows it can be a bad > word. > No slight intended; I'm speaking of loading binaries in-process which use BIO resource handles from libcrypto (libeay32 or whatever it was called) where the binaries arrive from different VC compilers or are built using different memory models (/MD vs /MT). So in the case that a user downloads perl, php, lua, etc built against different VC flavors by different open source projects, and loaded in-process underneath Apache.exe (httpd) binary, this stub is necessary. In the case that the user is loading these different environments and modules built with the same linkage by the same compiler, this stub is not necessary (except as noted in some broken flavors of openssl.) I never talked about a mod-php, as pointed before applink is needed for > phpXapache2_4.dll. The Microsoft PHP team asked (and still) me to use the > sim, they had some serious reports. Quote PHP team: Yeah, now it turned > out, that the SPKI functionality in PHP requires this shim to be in. The > functionality is available since PHP 5.6 and coupled with Apache could > result an unexpected process exit without the solution mentioned in the > OpenSSL FAQ compiled in. > phpXapache2_4.dll is the apache php module by another name. "Some reports" may still correspond to the openssl 1.0.2g bug mentioned in the thread. Or, what is likely going on is that SPKI binaries were compiled against OpenSSL using a different version of the compiler. > An other example: > mod_md errors when no applink sim, in the past AL has also reports of the > issue. > Just tested again with AH httpd-2.4.35 with Openssl 110i, and no > surprise, is does not even start, see below. Replacing the httpd.exe from > AL with the sim all fine. Looks like a module using ssl needs the sim. > This makes sense if the OpenSSL 1.1.0i is built with a different compiler and memory model. If it is built with the same, this should be reported to the openssl project as a bug. The BIO interfaces are used by mod_md, so this is expected. This is likely the 1.0.2g bug. In any case, the usage of apache allows for arbitrary modules to be loaded and in the binaries scenario. It seems the stub should be added in Apache.exe whenever mod_ssl/mod_md/aprutil have been linked to libcrypto. This all goes against your earlier comment to me not to add this patch to the Apache.exe binary for building on Windows. You are reversing your objection? I've seen another objection which suggests that "Apache.exe isn't even linked to OpenSSL." What's important here is that the stub does not invoke or link to OpenSSL at all. It simply provides an array of entry points to the current Visual Studio C Runtime, which Apache.exe is linked to, as a shared, exported symbol that can be found by any of the .dll code loaded in process. If so, based especially on mod_md and the possibility of users loading a flavor of the libcrypto/libssl libraries which weren't created by the same Visual Studio + memory model as when building Apache, it seems we should proceed with patching the Apache/httpd top level binary.
