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authproxy.go
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authproxy.go
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// Package authproxy implements a connector which relies on external
// authentication (e.g. mod_auth in Apache2) and returns an identity with the
// HTTP header X-Remote-User as verified email.
package authproxy
import (
"fmt"
"net/http"
"net/url"
"strings"
"github.com/dexidp/dex/connector"
"github.com/dexidp/dex/pkg/log"
)
// Config holds the configuration parameters for a connector which returns an
// identity with the HTTP header X-Remote-User as verified email,
// X-Remote-Group and configured staticGroups as user's group.
// Headers retrieved to fetch user's email and group can be configured
// with userHeader and groupHeader.
type Config struct {
UserHeader string `json:"userHeader"`
GroupHeader string `json:"groupHeader"`
Groups []string `json:"staticGroups"`
}
// Open returns an authentication strategy which requires no user interaction.
func (c *Config) Open(id string, logger log.Logger) (connector.Connector, error) {
userHeader := c.UserHeader
if userHeader == "" {
userHeader = "X-Remote-User"
}
groupHeader := c.GroupHeader
if groupHeader == "" {
groupHeader = "X-Remote-Group"
}
return &callback{userHeader: userHeader, groupHeader: groupHeader, logger: logger, pathSuffix: "/" + id, groups: c.Groups}, nil
}
// Callback is a connector which returns an identity with the HTTP header
// X-Remote-User as verified email.
type callback struct {
userHeader string
groupHeader string
groups []string
logger log.Logger
pathSuffix string
}
// LoginURL returns the URL to redirect the user to login with.
func (m *callback) LoginURL(s connector.Scopes, callbackURL, state string) (string, error) {
u, err := url.Parse(callbackURL)
if err != nil {
return "", fmt.Errorf("failed to parse callbackURL %q: %v", callbackURL, err)
}
u.Path += m.pathSuffix
v := u.Query()
v.Set("state", state)
u.RawQuery = v.Encode()
return u.String(), nil
}
// HandleCallback parses the request and returns the user's identity
func (m *callback) HandleCallback(s connector.Scopes, r *http.Request) (connector.Identity, error) {
remoteUser := r.Header.Get(m.userHeader)
if remoteUser == "" {
return connector.Identity{}, fmt.Errorf("required HTTP header %s is not set", m.userHeader)
}
groups := m.groups
headerGroup := r.Header.Get(m.groupHeader)
if headerGroup != "" {
splitheaderGroup := strings.Split(headerGroup, ",")
for i, v := range splitheaderGroup {
splitheaderGroup[i] = strings.TrimSpace(v)
}
groups = append(splitheaderGroup, groups...)
}
return connector.Identity{
UserID: remoteUser, // TODO: figure out if this is a bad ID value.
Email: remoteUser,
EmailVerified: true,
Groups: groups,
}, nil
}