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Enhance MongoDB Atlas CA certificate handling #60248

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Enhance MongoDB Atlas CA certificate handling #60248

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79c21f1
Enhance MongoDB Atlas CA certificate handling
hkhairy Oct 15, 2025
4468e86
Merge branch 'gravitational:master' into fix/mongodb-atlas-cas
hkhairy Oct 22, 2025
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23 changes: 21 additions & 2 deletions lib/srv/db/ca.go
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Original file line number Diff line number Diff line change
Expand Up @@ -209,6 +209,10 @@ func (s *Server) getCACertPaths(database types.Database) ([]string, error) {
case types.DatabaseTypeMongoAtlas:
return []string{
filepath.Join(s.cfg.DataDir, filepath.Base(isrgRootX1URL)),
filepath.Join(s.cfg.DataDir, filepath.Base(gtsRootR1URL)),
filepath.Join(s.cfg.DataDir, filepath.Base(gtsRootR2URL)),
filepath.Join(s.cfg.DataDir, filepath.Base(gtsRootR3URL)),
filepath.Join(s.cfg.DataDir, filepath.Base(gtsRootR4URL)),
}, nil
}

Expand Down Expand Up @@ -334,7 +338,18 @@ func (d *realDownloader) Download(ctx context.Context, database types.Database,
case types.DatabaseTypeAWSKeyspaces:
return d.downloadFromURL(amazonKeyspacesCAURL)
case types.DatabaseTypeMongoAtlas:
return d.downloadFromURL(isrgRootX1URL)
if strings.HasSuffix(isrgRootX1URL, hint) {
return d.downloadFromURL(isrgRootX1URL)
} else if strings.HasSuffix(gtsRootR1URL, hint) {
return d.downloadFromURL(gtsRootR1URL)
} else if strings.HasSuffix(gtsRootR2URL, hint) {
return d.downloadFromURL(gtsRootR2URL)
} else if strings.HasSuffix(gtsRootR3URL, hint) {
return d.downloadFromURL(gtsRootR3URL)
} else if strings.HasSuffix(gtsRootR4URL, hint) {
return d.downloadFromURL(gtsRootR4URL)
}
return nil, nil, trace.BadParameter("unknown MongoDB Atlas CA %q", hint)
}
return nil, nil, trace.BadParameter("%v doesn't support automatic CA download", database)
}
Expand Down Expand Up @@ -527,9 +542,13 @@ const (
// isrgRootX1URL is the URL to download ISRG Root X1 CA for Let's Encrypt. See:
// https://letsencrypt.org/certificates/
//
// MongoDB Atlas uses certificates signed by Let's Encrypt:
// MongoDB Atlas uses certificates signed by Let's Encrypt and Google Trust Services:
// https://www.mongodb.com/docs/atlas/reference/faq/security/#which-certificate-authority-signs-mongodb-atlas-tls-certificates-
isrgRootX1URL = "https://letsencrypt.org/certs/isrgrootx1.pem"
gtsRootR1URL = "https://i.pki.goog/r1.pem"
gtsRootR2URL = "https://i.pki.goog/r2.pem"
gtsRootR3URL = "https://i.pki.goog/r3.pem"
gtsRootR4URL = "https://i.pki.goog/r4.pem"

// cloudSQLDownloadError is the error message that gets returned when
// we failed to download root certificate for Cloud SQL instance.
Expand Down
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