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fix: OIDC issuerCA to load all certificates from PEM bundle #874

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fix: OIDC issuerCA to load all certificates from PEM bundle #874

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b8306fc
fix: OIDC issuerCA to load all certificates from PEM bundle
JoaoBraveCoding Feb 25, 2026
722a125
address reviews
JoaoBraveCoding Mar 30, 2026
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35 changes: 24 additions & 11 deletions authentication/oidc.go
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Original file line number Diff line number Diff line change
Expand Up @@ -45,7 +45,7 @@ type oidcConfig struct {
GroupClaim string `json:"groupClaim"`
IssuerRawCA []byte `json:"issuerCA"`
IssuerCAPath string `json:"issuerCAPath"`
issuerCA *x509.Certificate
issuerCAs []*x509.Certificate
IssuerURL string `json:"issuerURL"`
RedirectURL string `json:"redirectURL"`
UsernameClaim string `json:"usernameClaim"`
Expand Down Expand Up @@ -96,17 +96,28 @@ func newOIDCAuthenticator(c map[string]interface{}, tenant string,
}

if len(config.IssuerRawCA) != 0 {
block, _ := pem.Decode(config.IssuerRawCA)
if block == nil {
return nil, fmt.Errorf("failed to parse issuer CA certificate PEM")
}
var (
block *pem.Block
rest = config.IssuerRawCA
)

for {
block, rest = pem.Decode(rest)
if block == nil {
break
}

cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, fmt.Errorf("failed to parse issuer certificate: %s", err.Error())
cert, err := x509.ParseCertificate(block.Bytes)
if err != nil {
return nil, fmt.Errorf("failed to parse issuer certificate: %s", err.Error())
}

config.issuerCAs = append(config.issuerCAs, cert)
}

config.issuerCA = cert
if len(config.issuerCAs) == 0 {
return nil, fmt.Errorf("failed to parse issuer CA certificate PEM")
}
}

t := &http.Transport{
Expand All @@ -122,11 +133,13 @@ func newOIDCAuthenticator(c map[string]interface{}, tenant string,
ExpectContinueTimeout: 1 * time.Second,
}

if config.issuerCA != nil {
if len(config.issuerCAs) > 0 {
t.TLSClientConfig = &tls.Config{
RootCAs: x509.NewCertPool(),
}
t.TLSClientConfig.RootCAs.AddCert(config.issuerCA)
for _, ca := range config.issuerCAs {
t.TLSClientConfig.RootCAs.AddCert(ca)
}
}

client := &http.Client{
Expand Down
2 changes: 1 addition & 1 deletion main.go
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Original file line number Diff line number Diff line change
Expand Up @@ -236,7 +236,7 @@ type tenant struct {
GroupClaim string `json:"groupClaim"`
IssuerRawCA []byte `json:"issuerCA"`
IssuerCAPath string `json:"issuerCAPath"`
issuerCA *x509.Certificate
issuerCAs []*x509.Certificate
IssuerURL string `json:"issuerURL"`
RedirectURL string `json:"redirectURL"`
UsernameClaim string `json:"usernameClaim"`
Expand Down