package main
import (
"context"
"crypto"
"crypto/tls"
"encoding/base64"
"fmt"
"io/ioutil"
"net/http"
"net/url"
"os"
"regexp"
"strings"
"time"
oidc "github.com/coreos/go-oidc"
"github.com/dgrijalva/jwt-go"
"github.com/mbland/hmacauth"
"github.com/pusher/oauth2_proxy/pkg/apis/options"
sessionsapi "github.com/pusher/oauth2_proxy/pkg/apis/sessions"
"github.com/pusher/oauth2_proxy/pkg/encryption"
"github.com/pusher/oauth2_proxy/pkg/logger"
"github.com/pusher/oauth2_proxy/pkg/sessions"
"github.com/pusher/oauth2_proxy/providers"
"gopkg.in/natefinch/lumberjack.v2"
)
// Options holds Configuration Options that can be set by Command Line Flag,
// or Config File
type Options struct {
ProxyPrefix string `flag:"proxy-prefix" cfg:"proxy_prefix" env:"OAUTH2_PROXY_PROXY_PREFIX"`
PingPath string `flag:"ping-path" cfg:"ping_path" env:"OAUTH2_PROXY_PING_PATH"`
ProxyWebSockets bool `flag:"proxy-websockets" cfg:"proxy_websockets" env:"OAUTH2_PROXY_PROXY_WEBSOCKETS"`
HTTPAddress string `flag:"http-address" cfg:"http_address" env:"OAUTH2_PROXY_HTTP_ADDRESS"`
HTTPSAddress string `flag:"https-address" cfg:"https_address" env:"OAUTH2_PROXY_HTTPS_ADDRESS"`
ReverseProxy bool `flag:"reverse-proxy" cfg:"reverse_proxy" env:"OAUTH2_PROXY_REVERSE_PROXY"`
ForceHTTPS bool `flag:"force-https" cfg:"force_https" env:"OAUTH2_PROXY_FORCE_HTTPS"`
RedirectURL string `flag:"redirect-url" cfg:"redirect_url" env:"OAUTH2_PROXY_REDIRECT_URL"`
ClientID string `flag:"client-id" cfg:"client_id" env:"OAUTH2_PROXY_CLIENT_ID"`
ClientSecret string `flag:"client-secret" cfg:"client_secret" env:"OAUTH2_PROXY_CLIENT_SECRET"`
TLSCertFile string `flag:"tls-cert-file" cfg:"tls_cert_file" env:"OAUTH2_PROXY_TLS_CERT_FILE"`
TLSKeyFile string `flag:"tls-key-file" cfg:"tls_key_file" env:"OAUTH2_PROXY_TLS_KEY_FILE"`
AuthenticatedEmailsFile string `flag:"authenticated-emails-file" cfg:"authenticated_emails_file" env:"OAUTH2_PROXY_AUTHENTICATED_EMAILS_FILE"`
KeycloakGroup string `flag:"keycloak-group" cfg:"keycloak_group" env:"OAUTH2_PROXY_KEYCLOAK_GROUP"`
AzureTenant string `flag:"azure-tenant" cfg:"azure_tenant" env:"OAUTH2_PROXY_AZURE_TENANT"`
BitbucketTeam string `flag:"bitbucket-team" cfg:"bitbucket_team" env:"OAUTH2_PROXY_BITBUCKET_TEAM"`
BitbucketRepository string `flag:"bitbucket-repository" cfg:"bitbucket_repository" env:"OAUTH2_PROXY_BITBUCKET_REPOSITORY"`
EmailDomains []string `flag:"email-domain" cfg:"email_domains" env:"OAUTH2_PROXY_EMAIL_DOMAINS"`
WhitelistDomains []string `flag:"whitelist-domain" cfg:"whitelist_domains" env:"OAUTH2_PROXY_WHITELIST_DOMAINS"`
GitHubOrg string `flag:"github-org" cfg:"github_org" env:"OAUTH2_PROXY_GITHUB_ORG"`
GitHubTeam string `flag:"github-team" cfg:"github_team" env:"OAUTH2_PROXY_GITHUB_TEAM"`
GitLabGroup string `flag:"gitlab-group" cfg:"gitlab_group" env:"OAUTH2_PROXY_GITLAB_GROUP"`
GoogleGroups []string `flag:"google-group" cfg:"google_group" env:"OAUTH2_PROXY_GOOGLE_GROUPS"`
GoogleAdminEmail string `flag:"google-admin-email" cfg:"google_admin_email" env:"OAUTH2_PROXY_GOOGLE_ADMIN_EMAIL"`
GoogleServiceAccountJSON string `flag:"google-service-account-json" cfg:"google_service_account_json" env:"OAUTH2_PROXY_GOOGLE_SERVICE_ACCOUNT_JSON"`
HtpasswdFile string `flag:"htpasswd-file" cfg:"htpasswd_file" env:"OAUTH2_PROXY_HTPASSWD_FILE"`
DisplayHtpasswdForm bool `flag:"display-htpasswd-form" cfg:"display_htpasswd_form" env:"OAUTH2_PROXY_DISPLAY_HTPASSWD_FORM"`
CustomTemplatesDir string `flag:"custom-templates-dir" cfg:"custom_templates_dir" env:"OAUTH2_PROXY_CUSTOM_TEMPLATES_DIR"`
Banner string `flag:"banner" cfg:"banner" env:"OAUTH2_PROXY_BANNER"`
Footer string `flag:"footer" cfg:"footer" env:"OAUTH2_PROXY_FOOTER"`
// Embed CookieOptions
options.CookieOptions
// Embed SessionOptions
options.SessionOptions
Upstreams []string `flag:"upstream" cfg:"upstreams" env:"OAUTH2_PROXY_UPSTREAMS"`
SkipAuthRegex []string `flag:"skip-auth-regex" cfg:"skip_auth_regex" env:"OAUTH2_PROXY_SKIP_AUTH_REGEX"`
SkipJwtBearerTokens bool `flag:"skip-jwt-bearer-tokens" cfg:"skip_jwt_bearer_tokens" env:"OAUTH2_PROXY_SKIP_JWT_BEARER_TOKENS"`
ExtraJwtIssuers []string `flag:"extra-jwt-issuers" cfg:"extra_jwt_issuers" env:"OAUTH2_PROXY_EXTRA_JWT_ISSUERS"`
PassBasicAuth bool `flag:"pass-basic-auth" cfg:"pass_basic_auth" env:"OAUTH2_PROXY_PASS_BASIC_AUTH"`
BasicAuthPassword string `flag:"basic-auth-password" cfg:"basic_auth_password" env:"OAUTH2_PROXY_BASIC_AUTH_PASSWORD"`
PassAccessToken bool `flag:"pass-access-token" cfg:"pass_access_token" env:"OAUTH2_PROXY_PASS_ACCESS_TOKEN"`
PassHostHeader bool `flag:"pass-host-header" cfg:"pass_host_header" env:"OAUTH2_PROXY_PASS_HOST_HEADER"`
SkipProviderButton bool `flag:"skip-provider-button" cfg:"skip_provider_button" env:"OAUTH2_PROXY_SKIP_PROVIDER_BUTTON"`
PassUserHeaders bool `flag:"pass-user-headers" cfg:"pass_user_headers" env:"OAUTH2_PROXY_PASS_USER_HEADERS"`
SSLInsecureSkipVerify bool `flag:"ssl-insecure-skip-verify" cfg:"ssl_insecure_skip_verify" env:"OAUTH2_PROXY_SSL_INSECURE_SKIP_VERIFY"`
SSLUpstreamInsecureSkipVerify bool `flag:"ssl-upstream-insecure-skip-verify" cfg:"ssl_upstream_insecure_skip_verify" env:"OAUTH2_PROXY_SSL_UPSTREAM_INSECURE_SKIP_VERIFY"`
SetXAuthRequest bool `flag:"set-xauthrequest" cfg:"set_xauthrequest" env:"OAUTH2_PROXY_SET_XAUTHREQUEST"`
SetAuthorization bool `flag:"set-authorization-header" cfg:"set_authorization_header" env:"OAUTH2_PROXY_SET_AUTHORIZATION_HEADER"`
PassAuthorization bool `flag:"pass-authorization-header" cfg:"pass_authorization_header" env:"OAUTH2_PROXY_PASS_AUTHORIZATION_HEADER"`
SkipAuthPreflight bool `flag:"skip-auth-preflight" cfg:"skip_auth_preflight" env:"OAUTH2_PROXY_SKIP_AUTH_PREFLIGHT"`
FlushInterval time.Duration `flag:"flush-interval" cfg:"flush_interval" env:"OAUTH2_PROXY_FLUSH_INTERVAL"`
// These options allow for other providers besides Google, with
// potential overrides.
Provider string `flag:"provider" cfg:"provider" env:"OAUTH2_PROXY_PROVIDER"`
ProviderName string `flag:"provider-display-name" cfg:"provider_display_name" env:"OAUTH2_PROXY_PROVIDER_DISPLAY_NAME"`
OIDCIssuerURL string `flag:"oidc-issuer-url" cfg:"oidc_issuer_url" env:"OAUTH2_PROXY_OIDC_ISSUER_URL"`
InsecureOIDCAllowUnverifiedEmail bool `flag:"insecure-oidc-allow-unverified-email" cfg:"insecure_oidc_allow_unverified_email" env:"OAUTH2_PROXY_INSECURE_OIDC_ALLOW_UNVERIFIED_EMAIL"`
SkipOIDCDiscovery bool `flag:"skip-oidc-discovery" cfg:"skip_oidc_discovery" env:"OAUTH2_PROXY_SKIP_OIDC_DISCOVERY"`
OIDCJwksURL string `flag:"oidc-jwks-url" cfg:"oidc_jwks_url" env:"OAUTH2_PROXY_OIDC_JWKS_URL"`
LoginURL string `flag:"login-url" cfg:"login_url" env:"OAUTH2_PROXY_LOGIN_URL"`
RedeemURL string `flag:"redeem-url" cfg:"redeem_url" env:"OAUTH2_PROXY_REDEEM_URL"`
ProfileURL string `flag:"profile-url" cfg:"profile_url" env:"OAUTH2_PROXY_PROFILE_URL"`
ProtectedResource string `flag:"resource" cfg:"resource" env:"OAUTH2_PROXY_RESOURCE"`
ValidateURL string `flag:"validate-url" cfg:"validate_url" env:"OAUTH2_PROXY_VALIDATE_URL"`
Scope string `flag:"scope" cfg:"scope" env:"OAUTH2_PROXY_SCOPE"`
ApprovalPrompt string `flag:"approval-prompt" cfg:"approval_prompt" env:"OAUTH2_PROXY_APPROVAL_PROMPT"`
// Configuration values for logging
LoggingFilename string `flag:"logging-filename" cfg:"logging_filename" env:"OAUTH2_PROXY_LOGGING_FILENAME"`
LoggingMaxSize int `flag:"logging-max-size" cfg:"logging_max_size" env:"OAUTH2_PROXY_LOGGING_MAX_SIZE"`
LoggingMaxAge int `flag:"logging-max-age" cfg:"logging_max_age" env:"OAUTH2_PROXY_LOGGING_MAX_AGE"`
LoggingMaxBackups int `flag:"logging-max-backups" cfg:"logging_max_backups" env:"OAUTH2_PROXY_LOGGING_MAX_BACKUPS"`
LoggingLocalTime bool `flag:"logging-local-time" cfg:"logging_local_time" env:"OAUTH2_PROXY_LOGGING_LOCAL_TIME"`
LoggingCompress bool `flag:"logging-compress" cfg:"logging_compress" env:"OAUTH2_PROXY_LOGGING_COMPRESS"`
StandardLogging bool `flag:"standard-logging" cfg:"standard_logging" env:"OAUTH2_PROXY_STANDARD_LOGGING"`
StandardLoggingFormat string `flag:"standard-logging-format" cfg:"standard_logging_format" env:"OAUTH2_PROXY_STANDARD_LOGGING_FORMAT"`
RequestLogging bool `flag:"request-logging" cfg:"request_logging" env:"OAUTH2_PROXY_REQUEST_LOGGING"`
RequestLoggingFormat string `flag:"request-logging-format" cfg:"request_logging_format" env:"OAUTH2_PROXY_REQUEST_LOGGING_FORMAT"`
ExcludeLoggingPaths string `flag:"exclude-logging-paths" cfg:"exclude_logging_paths" env:"OAUTH2_PROXY_EXCLUDE_LOGGING_PATHS"`
SilencePingLogging bool `flag:"silence-ping-logging" cfg:"silence_ping_logging" env:"OAUTH2_PROXY_SILENCE_PING_LOGGING"`
AuthLogging bool `flag:"auth-logging" cfg:"auth_logging" env:"OAUTH2_PROXY_LOGGING_AUTH_LOGGING"`
AuthLoggingFormat string `flag:"auth-logging-format" cfg:"auth_logging_format" env:"OAUTH2_PROXY_AUTH_LOGGING_FORMAT"`
SignatureKey string `flag:"signature-key" cfg:"signature_key" env:"OAUTH2_PROXY_SIGNATURE_KEY"`
AcrValues string `flag:"acr-values" cfg:"acr_values" env:"OAUTH2_PROXY_ACR_VALUES"`
JWTKey string `flag:"jwt-key" cfg:"jwt_key" env:"OAUTH2_PROXY_JWT_KEY"`
JWTKeyFile string `flag:"jwt-key-file" cfg:"jwt_key_file" env:"OAUTH2_PROXY_JWT_KEY_FILE"`
PubJWKURL string `flag:"pubjwk-url" cfg:"pubjwk_url" env:"OAUTH2_PROXY_PUBJWK_URL"`
GCPHealthChecks bool `flag:"gcp-healthchecks" cfg:"gcp_healthchecks" env:"OAUTH2_PROXY_GCP_HEALTHCHECKS"`
// internal values that are set after config validation
redirectURL *url.URL
proxyURLs []*url.URL
CompiledRegex []*regexp.Regexp
provider providers.Provider
sessionStore sessionsapi.SessionStore
signatureData *SignatureData
oidcVerifier *oidc.IDTokenVerifier
jwtBearerVerifiers []*oidc.IDTokenVerifier
}
// SignatureData holds hmacauth signature hash and key
type SignatureData struct {
hash crypto.Hash
key string
}
// NewOptions constructs a new Options with defaulted values
func NewOptions() *Options {
return &Options{
ProxyPrefix: "/oauth2",
PingPath: "/ping",
ProxyWebSockets: true,
HTTPAddress: "127.0.0.1:4180",
HTTPSAddress: ":443",
ForceHTTPS: false,
DisplayHtpasswdForm: true,
CookieOptions: options.CookieOptions{
CookieName: "_oauth2_proxy",
CookieSecure: true,
CookieHTTPOnly: true,
CookieExpire: time.Duration(168) * time.Hour,
CookieRefresh: time.Duration(0),
},
SessionOptions: options.SessionOptions{
Type: "cookie",
},
SetXAuthRequest: false,
SkipAuthPreflight: false,
PassBasicAuth: true,
PassUserHeaders: true,
PassAccessToken: false,
PassHostHeader: true,
SetAuthorization: false,
PassAuthorization: false,
ApprovalPrompt: "force",
InsecureOIDCAllowUnverifiedEmail: false,
SkipOIDCDiscovery: false,
LoggingFilename: "",
LoggingMaxSize: 100,
LoggingMaxAge: 7,
LoggingMaxBackups: 0,
LoggingLocalTime: true,
LoggingCompress: false,
ExcludeLoggingPaths: "",
SilencePingLogging: false,
StandardLogging: true,
StandardLoggingFormat: logger.DefaultStandardLoggingFormat,
RequestLogging: true,
RequestLoggingFormat: logger.DefaultRequestLoggingFormat,
AuthLogging: true,
AuthLoggingFormat: logger.DefaultAuthLoggingFormat,
}
}
// jwtIssuer hold parsed JWT issuer info that's used to construct a verifier.
type jwtIssuer struct {
issuerURI string
audience string
}
func parseURL(toParse string, urltype string, msgs []string) (*url.URL, []string) {
parsed, err := url.Parse(toParse)
if err != nil {
return nil, append(msgs, fmt.Sprintf(
"error parsing %s-url=%q %s", urltype, toParse, err))
}
return parsed, msgs
}
// Validate checks that required options are set and validates those that they
// are of the correct format
func (o *Options) Validate() error {
if o.SSLInsecureSkipVerify {
// TODO: Accept a certificate bundle.
insecureTransport := &http.Transport{
TLSClientConfig: &tls.Config{InsecureSkipVerify: true},
}
http.DefaultClient = &http.Client{Transport: insecureTransport}
}
msgs := make([]string, 0)
if o.CookieSecret == "" {
msgs = append(msgs, "missing setting: cookie-secret")
}
if o.ClientID == "" {
msgs = append(msgs, "missing setting: client-id")
}
// login.gov uses a signed JWT to authenticate, not a client-secret
if o.ClientSecret == "" && o.Provider != "login.gov" {
msgs = append(msgs, "missing setting: client-secret")
}
if o.AuthenticatedEmailsFile == "" && len(o.EmailDomains) == 0 && o.HtpasswdFile == "" {
msgs = append(msgs, "missing setting for email validation: email-domain or authenticated-emails-file required."+
"\n use email-domain=* to authorize all email addresses")
}
if o.OIDCIssuerURL != "" {
ctx := context.Background()
// Construct a manual IDTokenVerifier from issuer URL & JWKS URI
// instead of metadata discovery if we enable -skip-oidc-discovery.
// In this case we need to make sure the required endpoints for
// the provider are configured.
if o.SkipOIDCDiscovery {
if o.LoginURL == "" {
msgs = append(msgs, "missing setting: login-url")
}
if o.RedeemURL == "" {
msgs = append(msgs, "missing setting: redeem-url")
}
if o.OIDCJwksURL == "" {
msgs = append(msgs, "missing setting: oidc-jwks-url")
}
keySet := oidc.NewRemoteKeySet(ctx, o.OIDCJwksURL)
o.oidcVerifier = oidc.NewVerifier(o.OIDCIssuerURL, keySet, &oidc.Config{
ClientID: o.ClientID,
})
} else {
// Configure discoverable provider data.
provider, err := oidc.NewProvider(ctx, o.OIDCIssuerURL)
if err != nil {
return err
}
o.oidcVerifier = provider.Verifier(&oidc.Config{
ClientID: o.ClientID,
})
o.LoginURL = provider.Endpoint().AuthURL
o.RedeemURL = provider.Endpoint().TokenURL
}
if o.Scope == "" {
o.Scope = "openid email profile"
}
}
if o.SkipJwtBearerTokens {
// If we are using an oidc provider, go ahead and add that provider to the list
if o.oidcVerifier != nil {
o.jwtBearerVerifiers = append(o.jwtBearerVerifiers, o.oidcVerifier)
}
// Configure extra issuers
if len(o.ExtraJwtIssuers) > 0 {
var jwtIssuers []jwtIssuer
jwtIssuers, msgs = parseJwtIssuers(o.ExtraJwtIssuers, msgs)
for _, jwtIssuer := range jwtIssuers {
verifier, err := newVerifierFromJwtIssuer(jwtIssuer)
if err != nil {
msgs = append(msgs, fmt.Sprintf("error building verifiers: %s", err))
}
o.jwtBearerVerifiers = append(o.jwtBearerVerifiers, verifier)
}
}
}
o.redirectURL, msgs = parseURL(o.RedirectURL, "redirect", msgs)
for _, u := range o.Upstreams {
upstreamURL, err := url.Parse(u)
if err != nil {
msgs = append(msgs, fmt.Sprintf("error parsing upstream: %s", err))
} else {
if upstreamURL.Path == "" {
upstreamURL.Path = "/"
}
o.proxyURLs = append(o.proxyURLs, upstreamURL)
}
}
for _, u := range o.SkipAuthRegex {
CompiledRegex, err := regexp.Compile(u)
if err != nil {
msgs = append(msgs, fmt.Sprintf("error compiling regex=%q %s", u, err))
continue
}
o.CompiledRegex = append(o.CompiledRegex, CompiledRegex)
}
msgs = parseProviderInfo(o, msgs)
var cipher *encryption.Cipher
if o.PassAccessToken || o.SetAuthorization || o.PassAuthorization || (o.CookieRefresh != time.Duration(0)) {
validCookieSecretSize := false
for _, i := range []int{16, 24, 32} {
if len(secretBytes(o.CookieSecret)) == i {
validCookieSecretSize = true
}
}
var decoded bool
if string(secretBytes(o.CookieSecret)) != o.CookieSecret {
decoded = true
}
if validCookieSecretSize == false {
var suffix string
if decoded {
suffix = fmt.Sprintf(" note: cookie secret was base64 decoded from %q", o.CookieSecret)
}
msgs = append(msgs, fmt.Sprintf(
"cookie_secret must be 16, 24, or 32 bytes "+
"to create an AES cipher when "+
"pass_access_token == true or "+
"cookie_refresh != 0, but is %d bytes.%s",
len(secretBytes(o.CookieSecret)), suffix))
} else {
var err error
cipher, err = encryption.NewCipher(secretBytes(o.CookieSecret))
if err != nil {
msgs = append(msgs, fmt.Sprintf("cookie-secret error: %v", err))
}
}
}
o.SessionOptions.Cipher = cipher
sessionStore, err := sessions.NewSessionStore(&o.SessionOptions, &o.CookieOptions)
if err != nil {
msgs = append(msgs, fmt.Sprintf("error initialising session storage: %v", err))
} else {
o.sessionStore = sessionStore
}
if o.CookieRefresh >= o.CookieExpire {
msgs = append(msgs, fmt.Sprintf(
"cookie_refresh (%s) must be less than "+
"cookie_expire (%s)",
o.CookieRefresh.String(),
o.CookieExpire.String()))
}
if len(o.GoogleGroups) > 0 || o.GoogleAdminEmail != "" || o.GoogleServiceAccountJSON != "" {
if len(o.GoogleGroups) < 1 {
msgs = append(msgs, "missing setting: google-group")
}
if o.GoogleAdminEmail == "" {
msgs = append(msgs, "missing setting: google-admin-email")
}
if o.GoogleServiceAccountJSON == "" {
msgs = append(msgs, "missing setting: google-service-account-json")
}
}
switch o.CookieSameSite {
case "", "none", "lax", "strict":
default:
msgs = append(msgs, fmt.Sprintf("cookie_samesite (%s) must be one of ['', 'lax', 'strict', 'none']", o.CookieSameSite))
}
msgs = parseSignatureKey(o, msgs)
msgs = validateCookieName(o, msgs)
msgs = setupLogger(o, msgs)
if len(msgs) != 0 {
return fmt.Errorf("Invalid configuration:\n %s",
strings.Join(msgs, "\n "))
}
return nil
}
func parseProviderInfo(o *Options, msgs []string) []string {
p := &providers.ProviderData{
Scope: o.Scope,
ClientID: o.ClientID,
ClientSecret: o.ClientSecret,
ApprovalPrompt: o.ApprovalPrompt,
}
p.LoginURL, msgs = parseURL(o.LoginURL, "login", msgs)
p.RedeemURL, msgs = parseURL(o.RedeemURL, "redeem", msgs)
p.ProfileURL, msgs = parseURL(o.ProfileURL, "profile", msgs)
p.ValidateURL, msgs = parseURL(o.ValidateURL, "validate", msgs)
p.ProtectedResource, msgs = parseURL(o.ProtectedResource, "resource", msgs)
o.provider = providers.New(o.Provider, p)
switch p := o.provider.(type) {
case *providers.AzureProvider:
p.Configure(o.AzureTenant)
case *providers.GitHubProvider:
p.SetOrgTeam(o.GitHubOrg, o.GitHubTeam)
case *providers.KeycloakProvider:
p.SetGroup(o.KeycloakGroup)
case *providers.GoogleProvider:
if o.GoogleServiceAccountJSON != "" {
file, err := os.Open(o.GoogleServiceAccountJSON)
if err != nil {
msgs = append(msgs, "invalid Google credentials file: "+o.GoogleServiceAccountJSON)
} else {
p.SetGroupRestriction(o.GoogleGroups, o.GoogleAdminEmail, file)
}
}
case *providers.BitbucketProvider:
p.SetTeam(o.BitbucketTeam)
p.SetRepository(o.BitbucketRepository)
case *providers.OIDCProvider:
p.AllowUnverifiedEmail = o.InsecureOIDCAllowUnverifiedEmail
if o.oidcVerifier == nil {
msgs = append(msgs, "oidc provider requires an oidc issuer URL")
} else {
p.Verifier = o.oidcVerifier
}
case *providers.GitLabProvider:
p.AllowUnverifiedEmail = o.InsecureOIDCAllowUnverifiedEmail
p.Group = o.GitLabGroup
p.EmailDomains = o.EmailDomains
if o.oidcVerifier != nil {
p.Verifier = o.oidcVerifier
} else {
// Initialize with default verifier for gitlab.com
ctx := context.Background()
provider, err := oidc.NewProvider(ctx, "https://gitlab.com")
if err != nil {
msgs = append(msgs, "failed to initialize oidc provider for gitlab.com")
} else {
p.Verifier = provider.Verifier(&oidc.Config{
ClientID: o.ClientID,
})
p.LoginURL, msgs = parseURL(provider.Endpoint().AuthURL, "login", msgs)
p.RedeemURL, msgs = parseURL(provider.Endpoint().TokenURL, "redeem", msgs)
}
}
case *providers.LoginGovProvider:
p.AcrValues = o.AcrValues
p.PubJWKURL, msgs = parseURL(o.PubJWKURL, "pubjwk", msgs)
// JWT key can be supplied via env variable or file in the filesystem, but not both.
switch {
case o.JWTKey != "" && o.JWTKeyFile != "":
msgs = append(msgs, "cannot set both jwt-key and jwt-key-file options")
case o.JWTKey == "" && o.JWTKeyFile == "":
msgs = append(msgs, "login.gov provider requires a private key for signing JWTs")
case o.JWTKey != "":
// The JWT Key is in the commandline argument
signKey, err := jwt.ParseRSAPrivateKeyFromPEM([]byte(o.JWTKey))
if err != nil {
msgs = append(msgs, "could not parse RSA Private Key PEM")
} else {
p.JWTKey = signKey
}
case o.JWTKeyFile != "":
// The JWT key is in the filesystem
keyData, err := ioutil.ReadFile(o.JWTKeyFile)
if err != nil {
msgs = append(msgs, "could not read key file: "+o.JWTKeyFile)
}
signKey, err := jwt.ParseRSAPrivateKeyFromPEM(keyData)
if err != nil {
msgs = append(msgs, "could not parse private key from PEM file:"+o.JWTKeyFile)
} else {
p.JWTKey = signKey
}
}
}
return msgs
}
func parseSignatureKey(o *Options, msgs []string) []string {
if o.SignatureKey == "" {
return msgs
}
components := strings.Split(o.SignatureKey, ":")
if len(components) != 2 {
return append(msgs, "invalid signature hash:key spec: "+
o.SignatureKey)
}
algorithm, secretKey := components[0], components[1]
var hash crypto.Hash
var err error
if hash, err = hmacauth.DigestNameToCryptoHash(algorithm); err != nil {
return append(msgs, "unsupported signature hash algorithm: "+
o.SignatureKey)
}
o.signatureData = &SignatureData{hash: hash, key: secretKey}
return msgs
}
// parseJwtIssuers takes in an array of strings in the form of issuer=audience
// and parses to an array of jwtIssuer structs.
func parseJwtIssuers(issuers []string, msgs []string) ([]jwtIssuer, []string) {
var parsedIssuers []jwtIssuer
for _, jwtVerifier := range issuers {
components := strings.Split(jwtVerifier, "=")
if len(components) < 2 {
msgs = append(msgs, fmt.Sprintf("invalid jwt verifier uri=audience spec: %s", jwtVerifier))
continue
}
uri, audience := components[0], strings.Join(components[1:], "=")
parsedIssuers = append(parsedIssuers, jwtIssuer{issuerURI: uri, audience: audience})
}
return parsedIssuers, msgs
}
// newVerifierFromJwtIssuer takes in issuer information in jwtIssuer info and returns
// a verifier for that issuer.
func newVerifierFromJwtIssuer(jwtIssuer jwtIssuer) (*oidc.IDTokenVerifier, error) {
config := &oidc.Config{
ClientID: jwtIssuer.audience,
}
// Try as an OpenID Connect Provider first
var verifier *oidc.IDTokenVerifier
provider, err := oidc.NewProvider(context.Background(), jwtIssuer.issuerURI)
if err != nil {
// Try as JWKS URI
jwksURI := strings.TrimSuffix(jwtIssuer.issuerURI, "/") + "/.well-known/jwks.json"
_, err := http.NewRequest("GET", jwksURI, nil)
if err != nil {
return nil, err
}
verifier = oidc.NewVerifier(jwtIssuer.issuerURI, oidc.NewRemoteKeySet(context.Background(), jwksURI), config)
} else {
verifier = provider.Verifier(config)
}
return verifier, nil
}
func validateCookieName(o *Options, msgs []string) []string {
cookie := &http.Cookie{Name: o.CookieName}
if cookie.String() == "" {
return append(msgs, fmt.Sprintf("invalid cookie name: %q", o.CookieName))
}
return msgs
}
func addPadding(secret string) string {
padding := len(secret) % 4
switch padding {
case 1:
return secret + "==="
case 2:
return secret + "=="
case 3:
return secret + "="
default:
return secret
}
}
// secretBytes attempts to base64 decode the secret, if that fails it treats the secret as binary
func secretBytes(secret string) []byte {
b, err := base64.URLEncoding.DecodeString(addPadding(secret))
if err == nil {
return []byte(addPadding(string(b)))
}
return []byte(secret)
}
func setupLogger(o *Options, msgs []string) []string {
// Setup the log file
if len(o.LoggingFilename) > 0 {
// Validate that the file/dir can be written
file, err := os.OpenFile(o.LoggingFilename, os.O_WRONLY|os.O_CREATE, 0666)
if err != nil {
if os.IsPermission(err) {
return append(msgs, "unable to write to log file: "+o.LoggingFilename)
}
}
file.Close()
logger.Printf("Redirecting logging to file: %s", o.LoggingFilename)
logWriter := &lumberjack.Logger{
Filename: o.LoggingFilename,
MaxSize: o.LoggingMaxSize, // megabytes
MaxAge: o.LoggingMaxAge, // days
MaxBackups: o.LoggingMaxBackups,
LocalTime: o.LoggingLocalTime,
Compress: o.LoggingCompress,
}
logger.SetOutput(logWriter)
}
// Supply a sanity warning to the logger if all logging is disabled
if !o.StandardLogging && !o.AuthLogging && !o.RequestLogging {
logger.Print("Warning: Logging disabled. No further logs will be shown.")
}
// Pass configuration values to the standard logger
logger.SetStandardEnabled(o.StandardLogging)
logger.SetAuthEnabled(o.AuthLogging)
logger.SetReqEnabled(o.RequestLogging)
logger.SetStandardTemplate(o.StandardLoggingFormat)
logger.SetAuthTemplate(o.AuthLoggingFormat)
logger.SetReqTemplate(o.RequestLoggingFormat)
logger.SetReverseProxy(o.ReverseProxy)
excludePaths := make([]string, 0)
excludePaths = append(excludePaths, strings.Split(o.ExcludeLoggingPaths, ",")...)
if o.SilencePingLogging {
excludePaths = append(excludePaths, o.PingPath)
}
logger.SetExcludePaths(excludePaths)
if !o.LoggingLocalTime {
logger.SetFlags(logger.Flags() | logger.LUTC)
}
return msgs
}