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解决编译LEDE时bughost.org无法访问致下载IPW-2100fw/2200fw驱动失败的问题

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尝试编译LEDE固件，遇到IPW-2100fw和ipw2200-fw下载失败。
注意到Makefile中相关字段:

cat package/kernel/mac80211/Makefile
...
IPW2100_NAME:=ipw2100-fw
IPW2100_VERSION:=1.3

define Download/ipw2100
  URL:=http://bughost.org/firmware/
  FILE:=$(IPW2100_NAME)-$(IPW2100_VERSION).tgz
  HASH:=e1107c455e48d324a616b47a622593bc8413dcce72026f72731c0b03dae3a7a2
endef
$(eval $(call Download,ipw2100))
...
IPW2200_NAME:=ipw2200-fw
IPW2200_VERSION:=3.1

define Download/ipw2200
  URL:=http://bughost.org/firmware/
  FILE:=$(IPW2200_NAME)-$(IPW2200_VERSION).tgz
  HASH:=c6818c11c18cc030d55ff83f64b2bad8feef485e7742f84f94a61d811a6258bd
endef
$(eval $(call Download,ipw2200))
...

原因是bughost.org最近几天down机了。
解决方法是将Makefile中的bughost.org换成其他的源，按如下修改再编译就可以了。

...
IPW2100_NAME:=ipw2100-fw
IPW2100_VERSION:=1.3

define Download/ipw2100
  URL:=https://people.freebsd.org/~flz/distfiles/ipw/
  FILE:=$(IPW2100_NAME)-$(IPW2100_VERSION).tgz
  HASH:=e1107c455e48d324a616b47a622593bc8413dcce72026f72731c0b03dae3a7a2
endef
$(eval $(call Download,ipw2100))
...
IPW2200_NAME:=ipw2200-fw
IPW2200_VERSION:=3.1

define Download/ipw2200
  URL:=https://people.freebsd.org/~flz/distfiles/ipw/
  FILE:=$(IPW2200_NAME)-$(IPW2200_VERSION).tgz
  HASH:=c6818c11c18cc030d55ff83f64b2bad8feef485e7742f84f94a61d811a6258bd
endef
$(eval $(call Download,ipw2200))
...

CentOS 7 编译安装nginx并启用TLS1.3

7条回复 
nginx 太过臃肿，设置过于复杂，转向caddy了，caddy暂时还在等待上游对tls v1.3的支持。
更新日志

20180411
Firefox Nightly 61.0a1支持tls1.3 Draft 26。
20180404
IESG批准将TLS 1.3 Draft 28作为TLS version 1.3 的建议标准；
至20180404，Openssl支持的标准为Draft 26。
20180312
Chrome 65正式版已经发布，支持tls1.3 Draft 23。
20180207
修正部分错误。
如果TLSv1.3如期发布，OpenSSL 1.1.1 将于2018年4月17日面向公众发布。对于服务器来说，我还是喜欢CentOS，支持周期很长，折腾一次可以用很长世间，因此以下记录一下在基于LNMP的CentOS 7 系统上启用TLSv1.3的过程。

1 升级系统

yum update

升级后的系统版本为：

cat /etc/centos-release
CentOS Linux release 7.4.1708 (Core)

2 安装官方mainline版的nginx

通过官方源安装nginx的目的是：
自动生成nginx的配置文件，减少大量的工作；
获取nginx的编译参数。

配置源：

vi /etc/yum.repos.d/nginx.repo

写入如下内容：

[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/mainline/centos/7/$basearch/
gpgcheck=0
enabled=1

安装nginx：

yum install nginx -y

查看nginx版本(可能未及时更新到最新版)：

nginx -v
nginx version: nginx/1.13.12

获取编译参数：

nginx -V
nginx version: nginx/1.13.12
built by gcc 4.8.5 20150623 (Red Hat 4.8.5-16) (GCC)
built with OpenSSL 1.0.2k-fips  26 Jan 2017
TLS SNI support enabled
configure arguments: --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib64/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -fPIC' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -pie'

修改nginx源，将enabled=1改为enabled=0，防止yum update时nginx被更新掉

vi /etc/yum.repos.d/nginx.repo
[nginx]
name=nginx repo
baseurl=http://nginx.org/packages/mainline/centos/7/$basearch/
gpgcheck=0
enabled=0

3 编译nginx

安装可能用到的依赖：

yum install -y git gcc gcc-c clang automake make autoconf libtool zlib-devel libatomic_ops-devel pcre-devel openssl-devel libxml2-devel libxslt-devel gd-devel GeoIP-devel gperftools-devel  perl-devel perl-ExtUtils-Embed

获取源码：

git clone https://github.com/nginx/nginx.git
git clone https://github.com/openssl/openssl.git
git clone https://github.com/grahamedgecombe/nginx-ct.git

nginx-ct是启用证书透明度（Certificate Transparency）策略的模块。为了启用Certificate Transparency和TLSv1.3，需要额外加入如下编译参数：

--add-module=../nginx-ct/ --with-openssl=../openssl/ --with-openssl-opt=enable-tls1_3

加在官方编译参数后面，简单修改形成完整的编译参数：

auto/configure --prefix=/etc/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/lib64/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=nginx --group=nginx --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-mail --with-mail_ssl_module --with-stream --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-cc-opt='-O2 -g -pipe -Wall -Wp,-D_FORTIFY_SOURCE=2 -fexceptions -fstack-protector-strong --param=ssp-buffer-size=4 -grecord-gcc-switches -m64 -mtune=generic -fPIC' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -pie' --add-module=../nginx-ct/ --with-openssl=../openssl/ --with-openssl-opt=enable-tls1_3

进入nginx源码目录，并输入如上完整的编译参数。
开始编译：

make

查看编译好的nginx信息：

./objs/nginx -v
nginx version: nginx/1.13.12

备份已经安装好的官方mainline版，安装编译版：

mv /usr/sbin/nginx /usr/sbin/nginx.1.13.12.20180411.official.mainline
cp ./objs/nginx /usr/sbin/

4 修改nginx配置文件内的ssl_protocols和ssl_ciphers，启用TLSv1.3

...
ssl_protocols          TLSv1 TLSv1.1 TLSv1.2 TLSv1.3;
ssl_ciphers            TLS13-AES-256-GCM-SHA384:TLS13-CHACHA20-POLY1305-SHA256:TLS13-AES-128-GCM-SHA256:TLS13-AES-128-CCM-8-SHA256:TLS13-AES-128-CCM-SHA256:EECDH+CHACHA20:ECDHE+aECDSA+CHACHA20:ECDHE+aRSA+CHACHA20:ECDHE+aECDSA+AESGCM:ECDHE+aRSA+AESGCM:ECDHE+aECDSA+AES256+SHA384:ECDHE+aRSA+AES256+SHA384:ECDHE+aECDSA+AES256+SHA:ECDHE+aRSA+AES256+SHA;
...

重启nginx服务以使修改生效:

systemctl restart nginx

5 测试TLSv1.3是否生效

5.1 使用testssl工具
git clone --depth 1 https://github.com/drwetter/testssl.sh.git
cd testssl.sh
./testssl.sh --help

命令为（coldawn.com需要换成自己的域名）：

./testssl.sh -p coldawn.com
...
 Testing protocols via sockets except SPDY+HTTP2

 SSLv2      not offered (OK)
 SSLv3      not offered (OK)
 TLS 1      offered
 TLS 1.1    offered
 TLS 1.2    offered (OK)
 TLS 1.3    offered (OK): draft 26
 SPDY/NPN   h2, http/1.1 (advertised)
 HTTP2/ALPN h2, http/1.1 (offered)
...

详细的情况，用大写的P作为参数：

./testssl.sh -P coldawn.com

 Testing server preferences

 Has server cipher order?     yes (OK)
 Negotiated protocol          TLSv1.3
 Negotiated cipher            TLS_AES_256_GCM_SHA384, 253 bit ECDH (X25519)
 Cipher order
    TLSv1:     ECDHE-ECDSA-AES256-SHA ECDHE-RSA-AES256-SHA 
    TLSv1.1:   ECDHE-ECDSA-AES256-SHA ECDHE-RSA-AES256-SHA 
    TLSv1.2:   ECDHE-ECDSA-CHACHA20-POLY1305 ECDHE-RSA-CHACHA20-POLY1305 ECDHE-ECDSA-AES256-GCM-SHA384 ECDHE-ECDSA-AES128-GCM-SHA256
               ECDHE-RSA-AES256-GCM-SHA384 ECDHE-RSA-AES128-GCM-SHA256 ECDHE-ECDSA-AES256-SHA384 ECDHE-RSA-AES256-SHA384 ECDHE-ECDSA-AES256-SHA
               ECDHE-RSA-AES256-SHA 
    TLSv1.3:   TLS_AES_256_GCM_SHA384 TLS_CHACHA20_POLY1305_SHA256 TLS_AES_128_GCM_SHA256
5.2 使用现代浏览器

Chrome暂不支持Draft 26，可以安装Firefox Nightly，已经支持TLS 1.3 Draft 26。