Allow existing users to login via OpenID Connect. (#8345)

Co-authored-by: Benjamin Koch <bbbsnowball@gmail.com>

This adds configuration flags that will match a user to pre-existing users
when logging in via OpenID Connect. This is useful when switching to
an existing SSO system.

1 files changed, 5 insertions, 0 deletions

diff --git a/docs/sample_config.yaml b/docs/sample_config.yaml

index fb04ff283d..845f537795 100644
--- a/docs/sample_config.yaml
+++ b/docs/sample_config.yaml
@@ -1689,6 +1689,11 @@ oidc_config:
   #
   #skip_verification: true
 
+  # Uncomment to allow a user logging in via OIDC to match a pre-existing account instead
+  # of failing. This could be used if switching from password logins to OIDC. Defaults to false.
+  #
+  #allow_existing_users: true
+
   # An external module can be provided here as a custom solution to mapping
   # attributes returned from a OIDC provider onto a matrix user.
   #