mirror of https://github.com/gophish/gophish
IMAP update; new library and attachment support (#1791)
Updates the IMAP processing to use a more mature library. This allows for more robust IMAP support. Additionally, this adds support for reporting emails as attachments.pull/1867/head
Glenn Wilkinson
GitHub
parent
8ebdb43469
commit
6f95da00ba
389
imap/imap.go
389
imap/imap.go
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@ -1,34 +1,34 @@
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package imap
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// Functionality taken from https://github.com/jprobinson/eazye
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import (
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"bytes"
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"crypto/tls"
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"fmt"
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"regexp"
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"strconv"
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"time"
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"github.com/emersion/go-imap"
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"github.com/emersion/go-imap/client"
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"github.com/emersion/go-message/charset"
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log "github.com/gophish/gophish/logger"
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"github.com/gophish/gophish/models"
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"github.com/jordan-wright/email"
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"github.com/mxk/go-imap/imap"
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)
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// Client interface for IMAP interactions
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type Client interface {
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Close(expunge bool) (cmd *imap.Command, err error)
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Login(username, password string) (cmd *imap.Command, err error)
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Logout(timeout time.Duration) (cmd *imap.Command, err error)
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Select(mbox string, readonly bool) (cmd *imap.Command, err error)
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UIDFetch(seq *imap.SeqSet, items ...string) (cmd *imap.Command, err error)
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UIDSearch(spec ...imap.Field) (cmd *imap.Command, err error)
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UIDStore(seq *imap.SeqSet, item string, value imap.Field) (cmd *imap.Command, err error)
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Select(name string, readOnly bool) (mbox *imap.MailboxStatus, err error)
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Store(seq *imap.SeqSet, item imap.StoreItem, value interface{}, ch chan *imap.Message) (err error)
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Fetch(seqset *imap.SeqSet, items []imap.FetchItem, ch chan *imap.Message) (err error)
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}
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// Email represents an email.Email with an included IMAP UID
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// Email represents an email.Email with an included IMAP Sequence Number
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type Email struct {
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UID uint32 `json:"uid"`
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SeqNum uint32 `json:"seqnum"`
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*email.Email
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}
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@ -44,98 +44,8 @@ type Mailbox struct {
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ReadOnly bool
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}
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// GetAll will pull all emails from the email folder and return them as a list.
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func (mbox *Mailbox) GetAll(markAsRead, delete bool) ([]Email, error) {
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// call chan, put 'em in a list, return
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var emails []Email
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responses, err := mbox.GenerateAll(markAsRead, delete)
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if err != nil {
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return emails, err
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}
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for resp := range responses {
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if resp.Err != nil {
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return emails, resp.Err
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}
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emails = append(emails, resp.Email)
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}
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return emails, nil
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}
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// GenerateAll will find all emails in the email folder and pass them along to the responses channel.
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func (mbox *Mailbox) GenerateAll(markAsRead, delete bool) (chan Response, error) {
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return mbox.generateMail("ALL", nil, markAsRead, delete)
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}
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// GetUnread will find all unread emails in the folder and return them as a list.
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func (mbox *Mailbox) GetUnread(markAsRead, delete bool) ([]Email, error) {
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// call chan, put 'em in a list, return
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var emails []Email
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responses, err := mbox.GenerateUnread(markAsRead, delete)
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if err != nil {
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return emails, err
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}
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for resp := range responses {
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if resp.Err != nil {
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return emails, resp.Err
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}
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emails = append(emails, resp.Email)
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}
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return emails, nil
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}
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// GenerateUnread will find all unread emails in the folder and pass them along to the responses channel.
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func (mbox *Mailbox) GenerateUnread(markAsRead, delete bool) (chan Response, error) {
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return mbox.generateMail("UNSEEN", nil, markAsRead, delete)
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}
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// MarkAsUnread will set the UNSEEN flag on a supplied slice of UIDs
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func (mbox *Mailbox) MarkAsUnread(uids []uint32) error {
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client, err := mbox.newClient()
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if err != nil {
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return err
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}
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defer func() {
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client.Close(true)
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client.Logout(30 * time.Second)
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}()
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for _, u := range uids {
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err := alterEmail(client, u, "\\SEEN", false)
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if err != nil {
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return err //return on first failure
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}
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}
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return nil
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}
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// DeleteEmails will delete emails from the supplied slice of UIDs
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func (mbox *Mailbox) DeleteEmails(uids []uint32) error {
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client, err := mbox.newClient()
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if err != nil {
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return err
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}
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defer func() {
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client.Close(true)
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client.Logout(30 * time.Second)
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}()
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for _, u := range uids {
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err := deleteEmail(client, u)
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if err != nil {
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return err //return on first failure
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}
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}
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return nil
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}
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// Validate validates supplied IMAP model by connecting to the server
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func Validate(s *models.IMAP) error {
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err := s.Validate()
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if err != nil {
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log.Error(err)
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@ -150,179 +60,51 @@ func Validate(s *models.IMAP) error {
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Pwd: s.Password,
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Folder: s.Folder}
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client, err := mailServer.newClient()
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imapClient, err := mailServer.newClient()
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if err != nil {
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log.Error(err.Error())
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} else {
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client.Close(true)
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client.Logout(30 * time.Second)
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imapClient.Logout()
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}
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return err
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}
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// Response is a helper struct to wrap the email responses and possible errors.
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type Response struct {
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Email Email
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Err error
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}
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// newClient will initiate a new IMAP connection with the given creds.
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func (mbox *Mailbox) newClient() (*imap.Client, error) {
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var client *imap.Client
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var err error
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if mbox.TLS {
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client, err = imap.DialTLS(mbox.Host, new(tls.Config))
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if err != nil {
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return client, err
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}
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} else {
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client, err = imap.Dial(mbox.Host)
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if err != nil {
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return client, err
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}
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}
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_, err = client.Login(mbox.User, mbox.Pwd)
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// MarkAsUnread will set the UNSEEN flag on a supplied slice of SeqNums
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func (mbox *Mailbox) MarkAsUnread(seqs []uint32) error {
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imapClient, err := mbox.newClient()
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if err != nil {
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return client, err
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return err
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}
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_, err = imap.Wait(client.Select(mbox.Folder, mbox.ReadOnly))
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defer imapClient.Logout()
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seqSet := new(imap.SeqSet)
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seqSet.AddNum(seqs...)
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item := imap.FormatFlagsOp(imap.RemoveFlags, true)
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err = imapClient.Store(seqSet, item, imap.SeenFlag, nil)
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if err != nil {
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return client, err
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return err
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}
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return client, nil
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return nil
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}
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const dateFormat = "02-Jan-2006"
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// findEmails will run a find the UIDs of any emails that match the search.:
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func findEmails(client Client, search string, since *time.Time) (*imap.Command, error) {
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var specs []imap.Field
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if len(search) > 0 {
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specs = append(specs, search)
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}
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if since != nil {
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sinceStr := since.Format(dateFormat)
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specs = append(specs, "SINCE", sinceStr)
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}
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// get headers and UID for UnSeen message in src inbox...
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cmd, err := imap.Wait(client.UIDSearch(specs...))
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// DeleteEmails will delete emails from the supplied slice of SeqNums
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func (mbox *Mailbox) DeleteEmails(seqs []uint32) error {
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imapClient, err := mbox.newClient()
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if err != nil {
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return &imap.Command{}, fmt.Errorf("uid search failed: %s", err)
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}
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return cmd, nil
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}
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const GenerateBufferSize = 100
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func (mbox *Mailbox) generateMail(search string, since *time.Time, markAsRead, delete bool) (chan Response, error) {
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responses := make(chan Response, GenerateBufferSize)
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client, err := mbox.newClient()
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if err != nil {
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close(responses)
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return responses, fmt.Errorf("failed to create IMAP connection: %s", err)
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return err
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}
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go func() {
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defer func() {
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client.Close(true)
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client.Logout(30 * time.Second)
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close(responses)
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}()
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defer imapClient.Logout()
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var cmd *imap.Command
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// find all the UIDs
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cmd, err = findEmails(client, search, since)
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if err != nil {
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responses <- Response{Err: err}
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return
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}
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// gotta fetch 'em all
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getEmails(client, cmd, markAsRead, delete, responses)
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}()
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seqSet := new(imap.SeqSet)
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seqSet.AddNum(seqs...)
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return responses, nil
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}
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func getEmails(client Client, cmd *imap.Command, markAsRead, delete bool, responses chan Response) {
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seq := &imap.SeqSet{}
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msgCount := 0
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for _, rsp := range cmd.Data {
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for _, uid := range rsp.SearchResults() {
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msgCount++
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seq.AddNum(uid)
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}
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}
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if seq.Empty() {
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return
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}
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fCmd, err := imap.Wait(client.UIDFetch(seq, "INTERNALDATE", "BODY[]", "UID", "RFC822.HEADER"))
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if err != nil {
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responses <- Response{Err: fmt.Errorf("unable to perform uid fetch: %s", err)}
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return
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}
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var email Email
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for _, msgData := range fCmd.Data {
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msgFields := msgData.MessageInfo().Attrs
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// make sure is a legit response before we attempt to parse it
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// deal with unsolicited FETCH responses containing only flags
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// I'm lookin' at YOU, Gmail!
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// http://mailman13.u.washington.edu/pipermail/imap-protocol/2014-October/002355.html
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// http://stackoverflow.com/questions/26262472/gmail-imap-is-sometimes-returning-bad-results-for-fetch
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if _, ok := msgFields["RFC822.HEADER"]; !ok {
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continue
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}
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email, err = NewEmail(msgFields)
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if err != nil {
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responses <- Response{Err: fmt.Errorf("unable to parse email: %s", err)}
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return
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}
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responses <- Response{Email: email}
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if !markAsRead {
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err = removeSeen(client, imap.AsNumber(msgFields["UID"]))
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if err != nil {
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responses <- Response{Err: fmt.Errorf("unable to remove seen flag: %s", err)}
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return
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}
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}
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if delete {
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err = deleteEmail(client, imap.AsNumber(msgFields["UID"]))
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if err != nil {
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responses <- Response{Err: fmt.Errorf("unable to delete email: %s", err)}
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return
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}
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}
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}
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}
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func deleteEmail(client Client, UID uint32) error {
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return alterEmail(client, UID, "\\DELETED", true)
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}
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func removeSeen(client Client, UID uint32) error {
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return alterEmail(client, UID, "\\SEEN", false)
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}
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func alterEmail(client Client, UID uint32, flag string, plus bool) error {
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flg := "-FLAGS"
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if plus {
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flg = "+FLAGS"
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}
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fSeq := &imap.SeqSet{}
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fSeq.AddNum(UID)
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_, err := imap.Wait(client.UIDStore(fSeq, flg, flag))
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item := imap.FormatFlagsOp(imap.AddFlags, true)
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err = imapClient.Store(seqSet, item, imap.DeletedFlag, nil)
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if err != nil {
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return err
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}
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@ -330,22 +112,95 @@ func alterEmail(client Client, UID uint32, flag string, plus bool) error {
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return nil
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}
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// NewEmail will parse an imap.FieldMap into an Email. This
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// will expect the message to container the internaldate and the body with
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// all headers included.
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func NewEmail(msgFields imap.FieldMap) (Email, error) {
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// GetUnread will find all unread emails in the folder and return them as a list.
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func (mbox *Mailbox) GetUnread(markAsRead, delete bool) ([]Email, error) {
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imap.CharsetReader = charset.Reader
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var emails []Email
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rawBody := imap.AsBytes(msgFields["BODY[]"])
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rawBodyStream := bytes.NewReader(rawBody)
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em, err := email.NewEmailFromReader(rawBodyStream) // Parse with @jordanwright's library
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imapClient, err := mbox.newClient()
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if err != nil {
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return Email{}, err
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}
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iem := Email{
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Email: em,
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UID: imap.AsNumber(msgFields["UID"]),
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return emails, fmt.Errorf("failed to create IMAP connection: %s", err)
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}
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return iem, err
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defer imapClient.Logout()
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// Search for unread emails
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criteria := imap.NewSearchCriteria()
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criteria.WithoutFlags = []string{imap.SeenFlag}
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seqs, err := imapClient.Search(criteria)
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if err != nil {
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return emails, err
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}
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if len(seqs) == 0 {
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return emails, nil
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}
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seqset := new(imap.SeqSet)
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seqset.AddNum(seqs...)
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section := &imap.BodySectionName{}
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items := []imap.FetchItem{imap.FetchEnvelope, imap.FetchFlags, imap.FetchInternalDate, section.FetchItem()}
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messages := make(chan *imap.Message)
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go func() {
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if err := imapClient.Fetch(seqset, items, messages); err != nil {
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log.Error("Error fetching emails: ", err.Error()) // TODO: How to handle this, need to propogate error out
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}
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}()
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// Step through each email
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for msg := range messages {
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// Extract raw message body. I can't find a better way to do this with the emersion library
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var em *email.Email
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var buf []byte
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for _, value := range msg.Body {
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buf = make([]byte, value.Len())
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value.Read(buf)
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break // There should only ever be one item in this map, but I'm not 100% sure
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}
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//Remove CR characters, see https://github.com/jordan-wright/email/issues/106
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tmp := string(buf)
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re := regexp.MustCompile(`\r`)
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tmp = re.ReplaceAllString(tmp, "")
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buf = []byte(tmp)
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rawBodyStream := bytes.NewReader(buf)
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em, err = email.NewEmailFromReader(rawBodyStream) // Parse with @jordanwright's library
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if err != nil {
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return emails, err
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}
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emtmp := Email{Email: em, SeqNum: msg.SeqNum} // Not sure why msg.Uid is always 0, so swapped to sequence numbers
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emails = append(emails, emtmp)
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}
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return emails, nil
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}
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// newClient will initiate a new IMAP connection with the given creds.
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func (mbox *Mailbox) newClient() (*client.Client, error) {
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var imapClient *client.Client
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var err error
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if mbox.TLS {
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imapClient, err = client.DialTLS(mbox.Host, new(tls.Config))
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} else {
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imapClient, err = client.Dial(mbox.Host)
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}
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if err != nil {
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return imapClient, err
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}
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err = imapClient.Login(mbox.User, mbox.Pwd)
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if err != nil {
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return imapClient, err
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}
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_, err = imapClient.Select(mbox.Folder, mbox.ReadOnly)
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if err != nil {
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return imapClient, err
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}
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return imapClient, nil
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}
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|
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116
imap/monitor.go
116
imap/monitor.go
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@ -7,19 +7,22 @@ package imap
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* - Add field to User for numner of non-campaign emails reported
|
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*/
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import (
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"bytes"
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"context"
|
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"regexp"
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"strconv"
|
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"strings"
|
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"time"
|
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"path/filepath"
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|
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log "github.com/gophish/gophish/logger"
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"github.com/jordan-wright/email"
|
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|
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"github.com/gophish/gophish/models"
|
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)
|
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|
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// Pattern for GoPhish emails e.g ?rid=AbC123
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var goPhishRegex = regexp.MustCompile("(\\?rid=[A-Za-z0-9]{7})")
|
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var goPhishRegex = regexp.MustCompile("(\\?rid=(3D)?([A-Za-z0-9]{7}))") // We include the optional quoted-printable 3D at the front, just in case decoding fails
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|
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// Monitor is a worker that monitors IMAP servers for reported campaign emails
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type Monitor struct {
|
||||
|
|
@ -30,7 +33,6 @@ type Monitor struct {
|
|||
// As each account can have its own polling frequency set we need to run one Go routine for
|
||||
// each, as well as keeping an eye on newly created user accounts.
|
||||
func (im *Monitor) start(ctx context.Context) {
|
||||
|
||||
usermap := make(map[int64]int) // Keep track of running go routines, one per user. We assume incrementing non-repeating UIDs (for the case where users are deleted and re-added).
|
||||
|
||||
for {
|
||||
|
|
@ -58,7 +60,6 @@ func (im *Monitor) start(ctx context.Context) {
|
|||
// monitor will continuously login to the IMAP settings associated to the supplied user id (if the user account has IMAP settings, and they're enabled.)
|
||||
// It also verifies the user account exists, and returns if not (for the case of a user being deleted).
|
||||
func monitor(uid int64, ctx context.Context) {
|
||||
|
||||
for {
|
||||
select {
|
||||
case <-ctx.Done():
|
||||
|
|
@ -80,7 +81,7 @@ func monitor(uid int64, ctx context.Context) {
|
|||
im := imapSettings[0]
|
||||
// 3. Check if IMAP is enabled
|
||||
if im.Enabled {
|
||||
log.Debug("Checking IMAP for user ", uid, ": ", im.Username, "@", im.Host)
|
||||
log.Debug("Checking IMAP for user ", uid, ": ", im.Username, " -> ", im.Host)
|
||||
checkForNewEmails(im)
|
||||
time.Sleep((time.Duration(im.IMAPFreq) - 10) * time.Second) // Subtract 10 to compensate for the default sleep of 10 at the bottom
|
||||
}
|
||||
|
|
@ -92,7 +93,6 @@ func monitor(uid int64, ctx context.Context) {
|
|||
|
||||
// NewMonitor returns a new instance of imap.Monitor
|
||||
func NewMonitor() *Monitor {
|
||||
|
||||
im := &Monitor{}
|
||||
return im
|
||||
}
|
||||
|
|
@ -116,7 +116,6 @@ func (im *Monitor) Shutdown() error {
|
|||
// checkForNewEmails logs into an IMAP account and checks unread emails
|
||||
// for the rid campaign identifier.
|
||||
func checkForNewEmails(im models.IMAP) {
|
||||
|
||||
im.Host = im.Host + ":" + strconv.Itoa(int(im.Port)) // Append port
|
||||
mailServer := Mailbox{
|
||||
Host: im.Host,
|
||||
|
|
@ -134,8 +133,9 @@ func checkForNewEmails(im models.IMAP) {
|
|||
err = models.SuccessfulLogin(&im)
|
||||
|
||||
if len(msgs) > 0 {
|
||||
var reportingFailed []uint32 // UIDs of emails that were unable to be reported to phishing server, mark as unread
|
||||
var campaignEmails []uint32 // UIDs of campaign emails. If DeleteReportedCampaignEmail is true, we will delete these
|
||||
log.Debugf("%d new emails for %s", len(msgs), im.Username)
|
||||
var reportingFailed []uint32 // SeqNums of emails that were unable to be reported to phishing server, mark as unread
|
||||
var deleteEmails []uint32 // SeqNums of campaign emails. If DeleteReportedCampaignEmail is true, we will delete these
|
||||
for _, m := range msgs {
|
||||
// Check if sender is from company's domain, if enabled. TODO: Make this an IMAP filter
|
||||
if im.RestrictDomain != "" { // e.g domainResitct = widgets.com
|
||||
|
|
@ -147,48 +147,88 @@ func checkForNewEmails(im models.IMAP) {
|
|||
}
|
||||
}
|
||||
|
||||
body := string(append(m.Email.Text, m.Email.HTML...)) // Not sure if we need to check the Text as well as the HTML. Perhaps sometimes Text only emails won't have an HTML component?
|
||||
rid := goPhishRegex.FindString(body)
|
||||
rids, err := matchEmail(m.Email) // Search email Text, HTML, and each attachment for rid parameters
|
||||
|
||||
if rid != "" {
|
||||
rid = rid[5:]
|
||||
if err != nil {
|
||||
log.Errorf("Error searching email for rids from user '%s': %s", m.Email.From, err.Error())
|
||||
continue
|
||||
}
|
||||
if len(rids) < 1 {
|
||||
// In the future this should be an alert in Gophish
|
||||
log.Infof("User '%s' reported email with subject '%s'. This is not a GoPhish campaign; you should investigate it.", m.Email.From, m.Email.Subject)
|
||||
}
|
||||
for rid := range rids {
|
||||
log.Infof("User '%s' reported email with rid %s", m.Email.From, rid)
|
||||
result, err := models.GetResult(rid)
|
||||
if err != nil {
|
||||
log.Error("Error reporting GoPhish email with rid ", rid, ": ", err.Error())
|
||||
reportingFailed = append(reportingFailed, m.UID)
|
||||
} else {
|
||||
err = result.HandleEmailReport(models.EventDetails{})
|
||||
if err != nil {
|
||||
log.Error("Error updating GoPhish email with rid ", rid, ": ", err.Error())
|
||||
} else {
|
||||
if im.DeleteReportedCampaignEmail {
|
||||
campaignEmails = append(campaignEmails, m.UID)
|
||||
}
|
||||
}
|
||||
reportingFailed = append(reportingFailed, m.SeqNum)
|
||||
continue
|
||||
}
|
||||
} else {
|
||||
// In the future this should be an alert in Gophish
|
||||
log.Debugf("User '%s' reported email with subject '%s'. This is not a GoPhish campaign; you should investigate it.\n", m.Email.From, m.Email.Subject)
|
||||
}
|
||||
// Check if any emails were unable to be reported, so we can mark them as unread
|
||||
if len(reportingFailed) > 0 {
|
||||
log.Debugf("Marking %d emails as unread as failed to report\n", len(reportingFailed))
|
||||
err := mailServer.MarkAsUnread(reportingFailed) // Set emails as unread that we failed to report to GoPhish
|
||||
err = result.HandleEmailReport(models.EventDetails{})
|
||||
if err != nil {
|
||||
log.Error("Unable to mark emails as unread: ", err.Error())
|
||||
log.Error("Error updating GoPhish email with rid ", rid, ": ", err.Error())
|
||||
continue
|
||||
}
|
||||
if im.DeleteReportedCampaignEmail == true {
|
||||
deleteEmails = append(deleteEmails, m.SeqNum)
|
||||
}
|
||||
}
|
||||
// If the DeleteReportedCampaignEmail flag is set, delete reported Gophish campaign emails
|
||||
if im.DeleteReportedCampaignEmail && len(campaignEmails) > 0 {
|
||||
log.Debugf("Deleting %d campaign emails\n", len(campaignEmails))
|
||||
err := mailServer.DeleteEmails(campaignEmails) // Delete GoPhish campaign emails.
|
||||
if err != nil {
|
||||
log.Error("Failed to delete emails: ", err.Error())
|
||||
}
|
||||
|
||||
}
|
||||
// Check if any emails were unable to be reported, so we can mark them as unread
|
||||
if len(reportingFailed) > 0 {
|
||||
log.Debugf("Marking %d emails as unread as failed to report", len(reportingFailed))
|
||||
err := mailServer.MarkAsUnread(reportingFailed) // Set emails as unread that we failed to report to GoPhish
|
||||
if err != nil {
|
||||
log.Error("Unable to mark emails as unread: ", err.Error())
|
||||
}
|
||||
}
|
||||
// If the DeleteReportedCampaignEmail flag is set, delete reported Gophish campaign emails
|
||||
if len(deleteEmails) > 0 {
|
||||
log.Debugf("Deleting %d campaign emails", len(deleteEmails))
|
||||
err := mailServer.DeleteEmails(deleteEmails) // Delete GoPhish campaign emails.
|
||||
if err != nil {
|
||||
log.Error("Failed to delete emails: ", err.Error())
|
||||
}
|
||||
}
|
||||
|
||||
} else {
|
||||
log.Debug("No new emails for ", im.Username)
|
||||
}
|
||||
}
|
||||
|
||||
func checkRIDs(em *email.Email, rids map[string]bool){
|
||||
// Check Text and HTML
|
||||
emailContent := string(em.Text) + string(em.HTML)
|
||||
for _, r := range goPhishRegex.FindAllStringSubmatch(emailContent, -1) {
|
||||
newrid := r[len(r)-1]
|
||||
if !rids[newrid] {
|
||||
rids[newrid] = true
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
// returns a slice of gophish rid paramters found in the email HTML, Text, and attachments
|
||||
func matchEmail(em *email.Email) (map[string]bool, error) {
|
||||
rids := make(map[string]bool)
|
||||
checkRIDs(em, rids)
|
||||
|
||||
// Next check each attachment
|
||||
for _, a := range em.Attachments {
|
||||
ext := filepath.Ext(a.Filename)
|
||||
if a.Header.Get("Content-Type") == "message/rfc822" || ext == ".eml" {
|
||||
|
||||
// Let's decode the email
|
||||
rawBodyStream := bytes.NewReader(a.Content)
|
||||
attachmentEmail, err := email.NewEmailFromReader(rawBodyStream)
|
||||
if err != nil {
|
||||
return rids, err
|
||||
}
|
||||
|
||||
checkRIDs(attachmentEmail, rids)
|
||||
}
|
||||
}
|
||||
|
||||
return rids, nil
|
||||
}
|
||||
|
|
|
|||
Loading…
Reference in New Issue