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api_key.go
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api_key.go
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package v1
import (
"crypto/rand"
"crypto/sha512"
"encoding/hex"
"fmt"
"net/http"
"strings"
"github.com/crowdsecurity/crowdsec/pkg/database"
"github.com/crowdsecurity/crowdsec/pkg/database/ent"
"github.com/crowdsecurity/crowdsec/pkg/types"
"github.com/gin-gonic/gin"
log "github.com/sirupsen/logrus"
)
var (
APIKeyHeader = "X-Api-Key"
bouncerContextKey = "bouncer_info"
)
type APIKey struct {
HeaderName string
DbClient *database.Client
TlsAuth *TLSAuth
}
func GenerateAPIKey(n int) (string, error) {
bytes := make([]byte, n)
if _, err := rand.Read(bytes); err != nil {
return "", err
}
return hex.EncodeToString(bytes), nil
}
func NewAPIKey(dbClient *database.Client) *APIKey {
return &APIKey{
HeaderName: APIKeyHeader,
DbClient: dbClient,
TlsAuth: &TLSAuth{},
}
}
func HashSHA512(str string) string {
hashedKey := sha512.New()
hashedKey.Write([]byte(str))
hashStr := fmt.Sprintf("%x", hashedKey.Sum(nil))
return hashStr
}
func (a *APIKey) MiddlewareFunc() gin.HandlerFunc {
return func(c *gin.Context) {
var bouncer *ent.Bouncer
var err error
if c.Request.TLS != nil && len(c.Request.TLS.PeerCertificates) > 0 {
if a.TlsAuth == nil {
log.WithField("ip", c.ClientIP()).Error("TLS Auth is not configured but client presented a certificate")
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
}
validCert, extractedCN, err := a.TlsAuth.ValidateCert(c)
if !validCert {
log.WithField("ip", c.ClientIP()).Errorf("invalid client certificate: %s", err)
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
}
if err != nil {
log.WithField("ip", c.ClientIP()).Error(err)
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
}
bouncerName := fmt.Sprintf("%s@%s", extractedCN, c.ClientIP())
bouncer, err = a.DbClient.SelectBouncerByName(bouncerName)
//This is likely not the proper way, but isNotFound does not seem to work
if err != nil && strings.Contains(err.Error(), "bouncer not found") {
//Because we have a valid cert, automatically create the bouncer in the database if it does not exist
//Set a random API key, but it will never be used
apiKey, err := GenerateAPIKey(64)
if err != nil {
log.WithFields(log.Fields{
"ip": c.ClientIP(),
"cn": extractedCN,
}).Errorf("error generating mock api key: %s", err)
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
}
log.WithFields(log.Fields{
"ip": c.ClientIP(),
"cn": extractedCN,
}).Infof("Creating bouncer %s", bouncerName)
bouncer, err = a.DbClient.CreateBouncer(bouncerName, c.ClientIP(), HashSHA512(apiKey), types.TlsAuthType)
if err != nil {
log.WithFields(log.Fields{
"ip": c.ClientIP(),
"cn": extractedCN,
}).Errorf("creating bouncer db entry : %s", err)
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
}
} else if err != nil {
//error while selecting bouncer
log.WithFields(log.Fields{
"ip": c.ClientIP(),
"cn": extractedCN,
}).Errorf("while selecting bouncers: %s", err)
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
} else if bouncer.AuthType != types.TlsAuthType {
//bouncer was found in DB
log.WithFields(log.Fields{
"ip": c.ClientIP(),
"cn": extractedCN,
}).Errorf("bouncer isn't allowed to auth by TLS")
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
}
} else {
//API Key Authentication
val, ok := c.Request.Header[APIKeyHeader]
if !ok {
log.WithFields(log.Fields{
"ip": c.ClientIP(),
}).Errorf("API key not found")
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
}
hashStr := HashSHA512(val[0])
bouncer, err = a.DbClient.SelectBouncer(hashStr)
if err != nil {
log.WithFields(log.Fields{
"ip": c.ClientIP(),
}).Errorf("while fetching bouncer info: %s", err)
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
}
if bouncer.AuthType != types.ApiKeyAuthType {
log.WithFields(log.Fields{
"ip": c.ClientIP(),
}).Errorf("bouncer %s attempted to login using an API key but it is configured to auth with %s", bouncer.Name, bouncer.AuthType)
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
}
}
if bouncer == nil {
log.WithFields(log.Fields{
"ip": c.ClientIP(),
}).Errorf("bouncer not found")
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
}
//maybe we want to store the whole bouncer object in the context instead, this would avoid another db query
//in StreamDecision
c.Set("BOUNCER_NAME", bouncer.Name)
c.Set("BOUNCER_HASHED_KEY", bouncer.APIKey)
if bouncer.IPAddress == "" {
err = a.DbClient.UpdateBouncerIP(c.ClientIP(), bouncer.ID)
if err != nil {
log.WithFields(log.Fields{
"ip": c.ClientIP(),
"name": bouncer.Name,
}).Errorf("Failed to update ip address for '%s': %s\n", bouncer.Name, err)
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
}
}
if bouncer.IPAddress != c.ClientIP() && bouncer.IPAddress != "" {
log.Warningf("new IP address detected for bouncer '%s': %s (old: %s)", bouncer.Name, c.ClientIP(), bouncer.IPAddress)
err = a.DbClient.UpdateBouncerIP(c.ClientIP(), bouncer.ID)
if err != nil {
log.WithFields(log.Fields{
"ip": c.ClientIP(),
"name": bouncer.Name,
}).Errorf("Failed to update ip address for '%s': %s\n", bouncer.Name, err)
c.JSON(http.StatusForbidden, gin.H{"message": "access forbidden"})
c.Abort()
return
}
}
useragent := strings.Split(c.Request.UserAgent(), "/")
if len(useragent) != 2 {
log.WithFields(log.Fields{
"ip": c.ClientIP(),
"name": bouncer.Name,
}).Warningf("bad user agent '%s'", c.Request.UserAgent())
useragent = []string{c.Request.UserAgent(), "N/A"}
}
if bouncer.Version != useragent[1] || bouncer.Type != useragent[0] {
if err := a.DbClient.UpdateBouncerTypeAndVersion(useragent[0], useragent[1], bouncer.ID); err != nil {
log.WithFields(log.Fields{
"ip": c.ClientIP(),
"name": bouncer.Name,
}).Errorf("failed to update bouncer version and type: %s", err)
c.JSON(http.StatusForbidden, gin.H{"message": "bad user agent"})
c.Abort()
return
}
}
c.Set(bouncerContextKey, bouncer)
c.Next()
}
}