CloudFlare servers in India get MITMd by the network provider (Airtel ISP) if the upstream is GitHub Pages and configured without end-to-end TLS.
curl -vvv https://docs.pixelfed.org
* Trying 104.21.76.155:443...
* TCP_NODELAY set
* Connected to docs.pixelfed.org (104.21.76.155) port 443 (#0)
* ALPN, offering h2
* ALPN, offering http/1.1
* successfully set certificate verify locations:
* CAfile: /etc/ssl/certs/ca-certificates.crt
CApath: /etc/ssl/certs
* TLSv1.3 (OUT), TLS handshake, Client hello (1):
* TLSv1.3 (IN), TLS handshake, Server hello (2):
* TLSv1.3 (IN), TLS handshake, Encrypted Extensions (8):
* TLSv1.3 (IN), TLS handshake, Certificate (11):
* TLSv1.3 (IN), TLS handshake, CERT verify (15):
* TLSv1.3 (IN), TLS handshake, Finished (20):
* TLSv1.3 (OUT), TLS change cipher, Change cipher spec (1):
* TLSv1.3 (OUT), TLS handshake, Finished (20):
* SSL connection using TLSv1.3 / TLS_AES_256_GCM_SHA384
* ALPN, server accepted to use h2
* Server certificate:
* subject: C=US; ST=California; L=San Francisco; O=Cloudflare, Inc.; CN=pixelfed.org
* start date: Jun 5 00:00:00 2021 GMT
* expire date: Jun 4 23:59:59 2022 GMT
* subjectAltName: host "docs.pixelfed.org" matched cert's "*.pixelfed.org"
* issuer: C=US; O=Cloudflare, Inc.; CN=Cloudflare Inc ECC CA-3
* SSL certificate verify ok.
* Using HTTP2, server supports multi-use
* Connection state changed (HTTP/2 confirmed)
* Copying HTTP/2 data in stream buffer to connection buffer after upgrade: len=0
* Using Stream ID: 1 (easy handle 0x555c62223e30)
> GET / HTTP/2
> Host: docs.pixelfed.org
> user-agent: curl/7.68.0
> accept: */*
>
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* TLSv1.3 (IN), TLS handshake, Newsession Ticket (4):
* old SSL session ID is stale, removing
* Connection state changed (MAX_CONCURRENT_STREAMS == 256)!
< HTTP/2 200
< date: Sat, 08 Jan 2022 05:21:21 GMT
< content-type: text/html
< pragma: no-cache
< cache-control: no-cache
< cf-cache-status: DYNAMIC
< expect-ct: max-age=604800, report-uri="https://report-uri.cloudflare.com/cdn-cgi/beacon/expect-ct"
< report-to: {"endpoints":[{"url":"https:\/\/a.nel.cloudflare.com\/report\/v3?s=JbNyelZ52h4ZSKnfhX0ZMHWv855HoqufbLcTonzlQ4%2BWIqYMoyvBwxt%2FoVX5v7xkDPkEjWWuiYbsYr%2FcSYyBFELYYBczPagh3Ln2QpwDgitpaX3ZRrDMy5%2B6VtDglxzL%2F70qpQ%3D%3D"}],"group":"cf-nel","max_age":604800}
< nel: {"success_fraction":0,"report_to":"cf-nel","max_age":604800}
< server: cloudflare
< cf-ray: 6ca2fb602a311dad-BLR
< alt-svc: h3=":443"; ma=86400, h3-29=":443"; ma=86400, h3-28=":443"; ma=86400, h3-27=":443"; ma=86400
<
* Connection #0 to host docs.pixelfed.org left intact
<meta name="viewport" content="width=device-width,initial-scale=1.0,maximum-scale=1.0" /><style>body{margin:0px;padding:0px;}iframe{width:100%;height:100%}</style><iframe src="https://www.airtel.in/dot/" width="100%" height="100%" frameborder=0></iframe>
CloudFlare has known about this issue for years (actively hostile ISPs) and they don't seem to be doing anything about it. The two fixes here are:
React
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