当curl或file_get_contents请求https url时，php崩溃。

Question

我的服务器是nginx + php-fpm。

下面的代码将导致错误

file_get_contents('https://github.com');

或

$ch = curl_init();
curl_setopt($ch, CURLOPT_URL, "https://github.com");
curl_setopt($ch, CURLOPT_RETURNTRANSFER, 1);
curl_setopt($ch, CURLOPT_HEADER, 0);
$output = curl_exec($ch); //crash here
curl_close($ch);

网页显示502错误。

nginx日志

错误2656#0：*541 recv()失败(104:从上游读取响应标头时连接重置)

fpm日志

07月03日:37:37.619903通知fpm_got_signal()，第48行:接收 07月03日:37:37.619926警告fpm_children_bury()，第215行:子3567 (池默认)退出信号11 SIGSEGV (核心转储)后417.576755秒开始 07月03日:37:37.620807通知fpm_children_make()，第352行:子4193 (池默认)启动

如果请求url以http://开头，则一切正常。

php配置命令是

'./configure' '--prefix=/www/nginx_php-5.2.17' '--with-config-file-path=/www/nginx_php-5.2.17/etc' '--with-mysql=/www/mysql' '--with-iconv=/usr' '--with-freetype-dir' '--with-jpeg-dir' '--with-png-dir' '--with-zlib' '--with-libxml-dir=/usr' '--enable-xml' '--disable-rpath' '--enable-discard-path' '--enable-inline-optimization' '--with-curl' '--enable-mbregex' '--enable-mbstring' '--with-mcrypt=/usr' '--with-gd' '--enable-gd-native-ttf' '--with-openssl' '--with-mhash' '--enable-ftp' '--enable-sockets' '--enable-zip' '--enable-fastcgi' '--enable-fpm' '--with-fpm-conf=/www/etc/php-fpm.conf'

Answer 1

尝试添加以下两个：

curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, FALSE);
curl_setopt($ch, CURLOPT_SSL_VERIFYHOST, FALSE);

他们将阻止对SSL证书的验证。可能是问题所在，因为验证可能失败。除非必须验证源代码，否则在使用cURL下载数据时始终要添加这2行代码。

PS：不过不确定这会对你有帮助。

Answer 2

我最近不得不处理一个类似的问题。在不深入了解细节的情况下，问题是旧的PHP版本(从源代码构建)与包管理器中的更新的cURL和OpenSSL库的组合导致了不兼容版本的冲突。

我最终解决问题的基本步骤是从发行版包管理器安装cURL和OpenSSL。使用它们可以下载兼容的cURL和OpenSSL版本的源代码包。卸载cURL。从源代码构建OpenSSL，然后构建cURL，配置为使用我刚刚构建的OpenSSL。在那里，我能够使用新构建的cURL和OpenSSL库来构建PHP。

这是我最后得到的安装脚本的片段：

# [curl should have been installed from package manager before this]
# Note: This script is based on Ubuntu 18. Paths may differ for different distributions. 

cd /usr/local/src

# Download OpenSSL and cURL sources first, using the pre-installed version of cURL. 
curl -SL --progress-bar https://www.openssl.org/source/old/1.0.2/openssl-1.0.2n.tar.gz -o openssl-1.0.2n.tar.gz
curl -SL https://curl.se/download/curl-7.65.0.tar.xz -o curl-7.65.0.tar.xz

# Remove the pre-installed cURL, we'll rebuild it from the source bundle,
# using the shared libraries from the OpenSSL version we will build now. 
apt-get remove -y --purge curl

# Extract and build OpenSSL from source package, making sure to enable the `shared` option
# so that `libssl.so` and `libcrypto.so` shared libraries are built, too. 
tar xvf openssl-1.0.2n.tar.gz
cd openssl-1.0.2n
./config shared # add the `-d` flag to include debug symbols
make -j 10
make install_sw

# Add a new config file for the dynamic linker, so that it knows to look for the new shared libraries we're building. 
# The first line is for where the new cURL libs will be, and the latter is where new OpenSSL libs will be.
echo -e "/usr/local/lib \n/usr/local/ssl/lib" > /etc/ld.so.conf.d/local.conf

# Reload the linker cache
ldconfig

cd /usr/local/src

# Extract and build cURL from source package, making sure to tell it to use the OpenSSL version we just built. 
tar -xvf curl-7.65.0.tar.xz
cd curl-7.65.0
./configure --with-ssl=/usr/local/ssl # add the `--enable-debug` flag to include debug symbols
make -j 10
make install

# Reload the linker cache
ldconfig

cd /usr/local/src

# Reload utility (bin) locations; find the newly built `curl` binary. 
hash -r

curl -SL --progress-bar http://www.php.net/distributions/php-5.5.38.tar.bz2 -o php-5.5.38.tar.bz2
tar -xvf php-5.5.38.tar.bz2
cd php-5.5.38

# Make sure the `--with-openssl` flag includes a path to the SSL libs created after building it from source. 
# `--with-curl`, by default, will look in `/usr/local/lib` and `/usr/local/include`; When built from source, 
# the generated libraries WILL be placed here, so you shouldn't need to specify the path, unless you put them elsewhere
# or your distro uses different paths
./configure \
    --with-openssl=/usr/local/ssl \ 
    --with-curl \
    # Any other config flags here
    # Other flags were omitted for this example

make -j 10
make install

注意:我写这个是为了一个测试和开发环境。即使忽略它使用的是PHP5.5，这也可能不适合于生产环境。