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sessionmanager.go
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/
sessionmanager.go
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package session
import (
"context"
"fmt"
"net"
"net/http"
"os"
"time"
jwt "github.com/dgrijalva/jwt-go"
log "github.com/sirupsen/logrus"
"google.golang.org/grpc/codes"
"google.golang.org/grpc/status"
"github.com/argoproj/argo-cd/common"
"github.com/argoproj/argo-cd/util/dex"
httputil "github.com/argoproj/argo-cd/util/http"
jwtutil "github.com/argoproj/argo-cd/util/jwt"
oidcutil "github.com/argoproj/argo-cd/util/oidc"
passwordutil "github.com/argoproj/argo-cd/util/password"
"github.com/argoproj/argo-cd/util/settings"
)
// SessionManager generates and validates JWT tokens for login sessions.
type SessionManager struct {
settingsMgr *settings.SettingsManager
client *http.Client
prov oidcutil.Provider
}
const (
// SessionManagerClaimsIssuer fills the "iss" field of the token.
SessionManagerClaimsIssuer = "argocd"
// invalidLoginError, for security purposes, doesn't say whether the username or password was invalid. This does not mitigate the potential for timing attacks to determine which is which.
invalidLoginError = "Invalid username or password"
blankPasswordError = "Blank passwords are not allowed"
badUserError = "Bad local superuser username"
)
// NewSessionManager creates a new session manager from Argo CD settings
func NewSessionManager(settingsMgr *settings.SettingsManager, dexServerAddr string) *SessionManager {
s := SessionManager{
settingsMgr: settingsMgr,
}
settings, err := settingsMgr.GetSettings()
if err != nil {
panic(err)
}
tlsConfig := settings.TLSConfig()
if tlsConfig != nil {
tlsConfig.InsecureSkipVerify = true
}
s.client = &http.Client{
Transport: &http.Transport{
TLSClientConfig: tlsConfig,
Proxy: http.ProxyFromEnvironment,
Dial: (&net.Dialer{
Timeout: 30 * time.Second,
KeepAlive: 30 * time.Second,
}).Dial,
TLSHandshakeTimeout: 10 * time.Second,
ExpectContinueTimeout: 1 * time.Second,
},
}
if settings.DexConfig != "" {
s.client.Transport = dex.NewDexRewriteURLRoundTripper(dexServerAddr, s.client.Transport)
}
if os.Getenv(common.EnvVarSSODebug) == "1" {
s.client.Transport = httputil.DebugTransport{T: s.client.Transport}
}
return &s
}
// Create creates a new token for a given subject (user) and returns it as a string.
// Passing a value of `0` for secondsBeforeExpiry creates a token that never expires.
func (mgr *SessionManager) Create(subject string, secondsBeforeExpiry int64) (string, error) {
// Create a new token object, specifying signing method and the claims
// you would like it to contain.
now := time.Now().UTC()
claims := jwt.StandardClaims{
IssuedAt: now.Unix(),
Issuer: SessionManagerClaimsIssuer,
NotBefore: now.Unix(),
Subject: subject,
}
if secondsBeforeExpiry > 0 {
expires := now.Add(time.Duration(secondsBeforeExpiry) * time.Second)
claims.ExpiresAt = expires.Unix()
}
return mgr.signClaims(claims)
}
func (mgr *SessionManager) signClaims(claims jwt.Claims) (string, error) {
log.Infof("Issuing claims: %v", claims)
token := jwt.NewWithClaims(jwt.SigningMethodHS256, claims)
settings, err := mgr.settingsMgr.GetSettings()
if err != nil {
return "", err
}
return token.SignedString(settings.ServerSignature)
}
// Parse tries to parse the provided string and returns the token claims for local superuser login.
func (mgr *SessionManager) Parse(tokenString string) (jwt.Claims, error) {
// Parse takes the token string and a function for looking up the key. The latter is especially
// useful if you use multiple keys for your application. The standard is to use 'kid' in the
// head of the token to identify which key to use, but the parsed token (head and claims) is provided
// to the callback, providing flexibility.
var claims jwt.MapClaims
settings, err := mgr.settingsMgr.GetSettings()
if err != nil {
return nil, err
}
token, err := jwt.ParseWithClaims(tokenString, &claims, func(token *jwt.Token) (interface{}, error) {
// Don't forget to validate the alg is what you expect:
if _, ok := token.Method.(*jwt.SigningMethodHMAC); !ok {
return nil, fmt.Errorf("Unexpected signing method: %v", token.Header["alg"])
}
return settings.ServerSignature, nil
})
if err != nil {
return nil, err
}
issuedAt := time.Unix(int64(claims["iat"].(float64)), 0)
if issuedAt.Before(settings.AdminPasswordMtime) {
return nil, fmt.Errorf("Password for superuser has changed since token issued")
}
return token.Claims, nil
}
// VerifyUsernamePassword verifies if a username/password combo is correct
func (mgr *SessionManager) VerifyUsernamePassword(username, password string) error {
if username != common.ArgoCDAdminUsername {
return status.Errorf(codes.Unauthenticated, badUserError)
}
if password == "" {
return status.Errorf(codes.Unauthenticated, blankPasswordError)
}
settings, err := mgr.settingsMgr.GetSettings()
if err != nil {
return err
}
valid, _ := passwordutil.VerifyPassword(password, settings.AdminPasswordHash)
if !valid {
return status.Errorf(codes.Unauthenticated, invalidLoginError)
}
return nil
}
// VerifyToken verifies if a token is correct. Tokens can be issued either from us or by an IDP.
// We choose how to verify based on the issuer.
func (mgr *SessionManager) VerifyToken(tokenString string) (jwt.Claims, error) {
parser := &jwt.Parser{
SkipClaimsValidation: true,
}
var claims jwt.StandardClaims
_, _, err := parser.ParseUnverified(tokenString, &claims)
if err != nil {
return nil, err
}
switch claims.Issuer {
case SessionManagerClaimsIssuer:
// Argo CD signed token
return mgr.Parse(tokenString)
default:
// IDP signed token
prov, err := mgr.provider()
if err != nil {
return nil, err
}
idToken, err := prov.Verify(claims.Audience, tokenString)
if err != nil {
return nil, err
}
var claims jwt.MapClaims
err = idToken.Claims(&claims)
return claims, err
}
}
func (mgr *SessionManager) provider() (oidcutil.Provider, error) {
if mgr.prov != nil {
return mgr.prov, nil
}
settings, err := mgr.settingsMgr.GetSettings()
if err != nil {
return nil, err
}
if !settings.IsSSOConfigured() {
return nil, fmt.Errorf("SSO is not configured")
}
mgr.prov = oidcutil.NewOIDCProvider(settings.IssuerURL(), mgr.client)
return mgr.prov, nil
}
// Username is a helper to extract a human readable username from a context
func Username(ctx context.Context) string {
claims, ok := ctx.Value("claims").(jwt.Claims)
if !ok {
return ""
}
mapClaims, err := jwtutil.MapClaims(claims)
if err != nil {
return ""
}
switch jwtutil.GetField(mapClaims, "iss") {
case SessionManagerClaimsIssuer:
return jwtutil.GetField(mapClaims, "sub")
default:
return jwtutil.GetField(mapClaims, "email")
}
}