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Johannes Schindelin
e9dd5d8f25
uinfo: special-case IIS APPPOOL accounts
The account under which Azure Web Apps run is an IIS APPOOL account that is generated on the fly. These are special because the virtual machines on which thes Apps run are not domain-joined, yet the accounts are domain accounts. To support the use case where such a Web App needs to call `ssh` (e.g. to deploy from a Git repository that is accessible only via SSH), we do need OpenSSH's `getpwuid (getuid ())` invocation to work. But currently it does not. Concretely, `getuid ()` returns -1 for these accounts, and OpenSSH fails to find the correct home directory (_especially_ when that home directory was overridden via a `db_home: env` line in `/etc/nsswitch.conf`). This can be verified e.g. in a Kudu console (for details about Kudu consoles, see https://github.com/projectkudu/kudu/wiki/Kudu-console): the domain is `IIS APPPOOL`, the account name is the name of the Azure Web App, the SID starts with 'S-1-5-82-`, and `pwdgrp::fetch_account_from_windows()` runs into the code path where "[...] the domain returned by LookupAccountSid is not our machine name, and if our machine is no domain member, we lose. We have nobody to ask for the POSIX offset." Since these IIS APPPOOL accounts are relatively similar to AzureAD accounts in this scenario, let's imitate the latter to support also the former. Reported-by: David Ebbo <david.ebbo@gmail.com> Helped-by: Corinna Vinschen <corinna@vinschen.de> Signed-off-by: Johannes Schindelin <johannes.schindelin@gmx.de>
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