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# Authentication
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## Creating your account
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You can create your account on our community portal running on [https://accounts.centos.org](https://accounts.centos.org).
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To register/create an account, just click on "Register" on the portal and follow the process.
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More information and user documentation is available on consolidated [online documentation](https://docs.fedoraproject.org/en-US/fedora-accounts/) for the portal
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## Modifying your account
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Once logged into the portal (still on https://accounts.centos.org) you can modify/edit your profile and see your group membership.
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Some settings you can modify directly:
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 * First/Last Name
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 * Locale
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 * Timezone
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 *  email address (attention that it needs to be a valid email address)
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 *  other personal details
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 *  your password
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 *  adding/removing OTP tokens (see below for 2FA)
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 *  ssh and gpg public keys
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### Enabling 2FA on your account (optional)
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It's adviced (but not mandatory) to implement 2 Factor Authentication on your account (for some critical accounts, that's though required).
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You can add one (or more, adviced) OTP tokens on your profile. Known to work solutions so far :
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 * Yubikey (4 and above, that supports OTP) : through rpm pkg yubioath-desktop
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 * FreeOTP (available on Google Play Store)
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 * OTPClient (available as rpm pkg and flatpak/flathub)
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 * others (list is non exhaustive)
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More informations about 2FA is available on specific [portal documentation](https://docs.fedoraproject.org/en-US/fedora-accounts/user/#twofactor)
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## SIG group membership
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There is no current form that you can use to be added in a SIG group but you have to reach out to a SIG chair (having delegated rights to add/remove people in the SIG group you want to join) and he can then add you, after having confirmed that you can be onboarded in the SIG
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To know people who can "sponsors" you in a SIG/group, you can , once authenticated, search for a group on the portal and then see people listed under the "Sponsors" area (for example, consider the [Automotive SIG](https://accounts.centos.org/group/sig-automotive/)
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## Retrieving your TLS certificate
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To be able to request a signed TLS certificate, you need first to install the cli tool that will use kerberos auth first to request a locally generated (automatic) CSR to be sent to IPA for signing operation and you'll then get your certificate back.
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Supported Linux distributions: CentOS 8/8-s , Fedora 32,33,34
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```
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sudo dnf install -y epel-release # only if you are on CentOS 8 / 8-stream not needed for Fedora
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sudo dnf install -y centos-packager
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```
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Your user certificate bundle comes in the form of 1 file:
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~/.centos.cert : PEM file with your X509 Client Certificate and Key
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To generate your certificate you can use the 'centos-cert' tool included in the centos-packager package:
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```
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 centos-cert
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You need to call the script like this : /usr/bin/centos-cert -arguments
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 -u : username ([REQUIRED] : your existing ACO/FAS username)
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 -v : just validates the existing TLS certificate ([OPTIONAL])
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 -r : REALM to use for kerberos ([OPTIONAL] : defaults to FEDORAPROJECT.ORG)
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 -f : fasjson url ([OPTIONAL]: defaults to https://fasjson.fedoraproject.org)
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 -h : display this help
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```
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If you've signed up with the account name `tuser`, you can generate your new certificate like this:
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```
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    [tuser@myworkstation]$ centos-cert -u tuser
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```
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!!! note
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    Attention that centos-cert -u tuser will request a new certificate, so that will automatically revoke any other certificate you had in the past. If you need to use cbs/koji on multiple machines, just copy the files mentioned above on the other machine.
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!!! warning
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    Important note WRT OTP: If you have enabled Two Factor auth, you absolutely need to get a valid kerberos ticket through other step *before* using centos-cert. See details on the [Fedora Accounts Documentation](https://docs.fedoraproject.org/en-US/fedora-accounts/user/#twofactor) for this
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## Linking your CentOS account to gitlab
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The first thing to understand is that gitlab will "link" an existing account
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with third party authentication system. In other words, you need to have a
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gitlab account and be logged in onto gitlab.com before you can associate your
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account with the CentOS Account System (ACO).
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So if you do not have a gitlab account, create one and log with it into [
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https://gitlab.com](https://gitlab.com). Then visit the following link [
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https://id.centos.org/gitlab](https://id.centos.org/gitlab) to associate your
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account with CentOS' Account System.
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From there on, everytime you visit this link, your group membership defined in
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ACO, will be refreshed on gitlab.