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a\ntoken.",[514,515,517],"h2",{"id":516},"before-you-start","Before you start",[519,520,521,530,533],"ul",{},[522,523,524,525,529],"li",{},"Kraft is bound to ",[526,527,528],"code",{},"127.0.0.1",", which is the default.",[522,531,532],{},"A tunnel or reverse proxy on this machine: cloudflared, ngrok, Caddy or nginx.",[522,534,535],{},"A second device to check from. A request from this machine names a loopback\nclient, and Kraft asks it for no password.",[514,537,539],{"id":538},"choose-the-fix","Choose the fix",[510,541,542,543,546,547,550,551,556,557,561],{},"A tunnel or reverse proxy on this machine that passes on the name its clients\nused gets a 403 for every request: ",[526,544,545],{},"unexpected Host for a server bound to 127.0.0.1",". Scripts and webhooks get it too, and ",[526,548,549],{},"allowed_hosts"," is not read.\n",[552,553,555],"a",{"href":554},"\u002Freference\u002Fhttp-api#who-may-call","Who may call"," has the rule. Coming from 1.4,\nsee ",[552,558,560],{"href":559},"\u002Fguides\u002Frun\u002Fupgrade-from-1-4#network-access","Network access",".",[510,563,564],{},"Choose the fix by what has to reach Kraft:",[519,566,567,590],{},[522,568,569,573,574,577,578,580,581,585,586,589],{},[570,571,572],"strong",{},"The board:"," use ",[552,575,140],{"href":576},"\u002Fguides\u002Frun\u002Fremote-access#choose-a-way","\ninstead, with a password and the name in ",[526,579,549],{},". For a proxy you run,\nsuch as Caddy or nginx, that is\n",[552,582,584],{"href":583},"\u002Fguides\u002Frun\u002Fremote-access#behind-a-reverse-proxy-you-run","Behind a reverse proxy you run",".\nA loopback-bound Kraft behind a proxy serves webhooks and scripts only, never\nthe board: a browser's sign-in, every\nchange it makes on the board and the live-update socket carry the name it used\nas their ",[526,587,588],{},"Origin",", and Kraft refuses those as cross-site.",[522,591,592,595,596,599],{},[570,593,594],{},"Webhooks and scripts only:"," have the proxy send ",[526,597,598],{},"Host: localhost",", as\nbelow.",[514,601,603,604,606],{"id":602},"send-host-localhost-from-the-proxy","Send ",[526,605,598],{}," from the proxy",[510,608,609],{},[610,611],"img",{"alt":612,"src":613,"width":614},"The path of a request: the sender, then the proxy on this machine (Host localhost, X-Forwarded-For the sender), then Kraft. Kraft answers 403 to a remote client when no password is set, and 403 to a Host other than localhost. A client that is this machine gets no sign-in. Any other client gets 401 without a session, the mcp-token or the trigger token, and the API answers with one","\u002Fdiagrams\u002Fportrait\u002Fproxy.svg",495,[510,616,617,618,621,622,625],{},"Before you rewrite ",[526,619,620],{},"Host",", know what it does to sign-in. A loopback-bound Kraft\nasks a request from this machine for no password, and a request through a proxy\non this machine is one, unless the proxy names its client in ",[526,623,624],{},"X-Forwarded-For",".\nSo:",[627,628,629,636,650],"ol",{},[522,630,631,632,561],{},"First set a password, as in ",[552,633,635],{"href":634},"\u002Fguides\u002Frun\u002Fremote-access#set-a-password","Set a password",[522,637,638,639,642,643,645,646,649],{},"Make sure the proxy sets that header itself: nginx does not unless you add\n",[526,640,641],{},"proxy_set_header X-Forwarded-For $proxy_add_x_forwarded_for;",", which appends\nthe client's address. Appending or replacing is right. Never let the proxy\npass a caller's own ",[526,644,624],{}," through as it came: a caller who sends\n",[526,647,648],{},"X-Forwarded-For: 127.0.0.1"," would then be taken for a client on this machine,\nand Kraft would ask it for no login.",[522,651,652,653,655],{},"Make the proxy send ",[526,654,598],{},", with the setting for yours.",[657,658,659,672],"table",{},[660,661,662],"thead",{},[663,664,665,669],"tr",{},[666,667,668],"th",{},"Proxy",[666,670,671],{},"Setting",[673,674,675,695,705,720],"tbody",{},[663,676,677,681],{},[678,679,680],"td",{},"cloudflared",[678,682,683,686,687,690,691,694],{},[526,684,685],{},"httpHostHeader: localhost"," in the ingress rule's ",[526,688,689],{},"originRequest",", or ",[526,692,693],{},"--http-host-header localhost"," on the command line",[663,696,697,700],{},[678,698,699],{},"ngrok",[678,701,702],{},[526,703,704],{},"--host-header=rewrite",[663,706,707,710],{},[678,708,709],{},"Caddy",[678,711,712,715,716,719],{},[526,713,714],{},"header_up Host localhost"," in the ",[526,717,718],{},"reverse_proxy"," block",[663,721,722,725],{},[678,723,724],{},"nginx",[678,726,727],{},[526,728,729],{},"proxy_set_header Host localhost;",[510,731,732,733,736,737,740,741,745,746,749,750,752],{},"Kraft then asks every API call through the proxy for a session, for the\n",[526,734,735],{},"mcp-token"," as a bearer, or, on ",[526,738,739],{},"POST \u002Fapi\u002Ftriggers",", for the\n",[552,742,744],{"href":743},"\u002Fguides\u002Fcustomize\u002Fschedule-and-webhook-work#file-a-work-item-from-a-webhook","trigger token",".\n",[526,747,748],{},"\u002Fapi\u002Fhealth",", the page shell and its assets need none. While no password is set\nit refuses every request. Without ",[526,751,624],{},", everyone who reaches the\nproxy has the whole API, with no sign-in, password or not.",[510,754,755,756,758,759,761,762,765,766,769,770,773,774,776],{},"Kraft takes the client from the last ",[526,757,624],{}," address that is not\n",[526,760,528],{}," or ",[526,763,764],{},"::1",". It reads the header only from a peer at one of those two\naddresses, which is uvicorn's default list. ",[526,767,768],{},"FORWARDED_ALLOW_IPS"," in the server's\nenvironment replaces that list (",[526,771,772],{},"*"," trusts any peer). For the loopback-bound Kraft this page\ncovers, keep it unset. A proxy on another machine needs it set to that proxy's\naddress for a per-client lockout, as\n",[552,775,584],{"href":583}," says.",[510,778,779,780,783],{},"A proxy that is itself fed from loopback, such as an ",[526,781,782],{},"ssh -R"," endpoint or a second proxy on\nthis machine, passes every request on as local, and Kraft asks it for no\npassword even with one set. Put nothing like that in front of a loopback-bound\nKraft.",[514,785,787],{"id":786},"check-it-worked","Check it worked",[510,789,790],{},"You know it worked when two requests through the proxy answer as follows. Make\nthem from another device, not from this machine: a request from this machine\nnames a loopback client, and Kraft asks it for no password.",[627,792,793,806],{},[522,794,795,797,798,801,802,805],{},[526,796,748],{}," answers with a JSON status. A ",[526,799,800],{},"403"," ",[526,803,804],{},"unexpected Host"," means the\nproxy still sends the name its client used.",[522,807,808,811,812,815,816,818,819,822,823,826,827,829,830,832,833,835,836,838],{},[526,809,810],{},"\u002Fapi\u002Fwork-items",", with no credentials, answers ",[526,813,814],{},"401",". A ",[526,817,800],{}," means no\npassword is set: Kraft refuses every request through the proxy until one is\n(step 1 above).",[820,821],"br",{},"A ",[526,824,825],{},"200"," means the\nproxy is not sending ",[526,828,624],{},", so Kraft takes every request for a\nlocal one and everyone who reaches the proxy has the whole API. Fix that\nbefore you go on. Then send it again with ",[526,831,648],{}," added:\nit must still answer ",[526,834,814],{},", and a ",[526,837,825],{}," means the proxy passes a caller's own\nheader through.",[514,840,842],{"id":841},"next-steps","Next steps",[519,844,845,850,855,863],{},[522,846,847,849],{},[552,848,140],{"href":141},": reach the board itself, over Tailscale, your local network or a tunnel",[522,851,852,854],{},[552,853,555],{"href":554},": the rule behind the 403",[522,856,857,859,860,862],{},[552,858,424],{"href":425},": call ",[526,861,739],{}," from off-machine with the trigger token",[522,864,865,867],{},[552,866,477],{"href":478},": the threat model behind the password and the host check",{"title":869,"searchDepth":870,"depth":870,"links":871},"",2,[872,873,874,876,877],{"id":516,"depth":870,"text":517},{"id":538,"depth":870,"text":539},{"id":602,"depth":870,"text":875},"Send Host: localhost from the proxy",{"id":786,"depth":870,"text":787},{"id":841,"depth":870,"text":842},"Let a tunnel or reverse proxy on this machine pass webhooks and scripts to a loopback-bound Kraft by sending Host localhost, and check that nobody gets in without signing in.","md",null,{},true,{"title":144,"description":878},"ikKbyRWQFs0br3DUDBe4M2k0ZKxoyKtP_L6_C9AIVec",[886,888],{"title":140,"path":141,"stem":142,"description":887,"children":-1},"Approve or reject a gate from a phone, over Tailscale, a tunnel or a reverse proxy you run, using the same password auth as the local board, get back if Kraft does not restart, and rotate the token.",{"title":148,"path":149,"stem":150,"description":889,"children":-1},"Pause the items that have an agent running, restart the server, and resume them, so the restart ends no agent.",1791801252223]