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max size and check whether doer is allowed

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This commit is contained in:
Felix Sommer 2024-10-13 15:26:14 +02:00
parent 13190ebb9f
commit 79ce159262
3 changed files with 38 additions and 11 deletions
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3
custom/conf/app.example.ini
View File

@ -1707,6 +1707,9 @@ LEVEL = Info
;;
;; convert links of attached images to inline images. Only for images hosted in this gitea instance.
;BASE64_EMBED_IMAGES = false
;;
;; The maximum size of an image attachment to be embedded in the email.
;BASE64_EMBED_IMAGES_MAX_SIZE = 5242880
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;

24
modules/setting/mailer.go
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@ -13,22 +13,23 @@ import (
"code.gitea.io/gitea/modules/log"
shellquote "github.com/kballard/go-shellquote"
"github.com/kballard/go-shellquote"
)
// Mailer represents mail service.
type Mailer struct {
// Mailer
Name string `ini:"NAME"`
From string `ini:"FROM"`
EnvelopeFrom string `ini:"ENVELOPE_FROM"`
OverrideEnvelopeFrom bool `ini:"-"`
FromName string `ini:"-"`
FromEmail string `ini:"-"`
SendAsPlainText bool `ini:"SEND_AS_PLAIN_TEXT"`
SubjectPrefix string `ini:"SUBJECT_PREFIX"`
OverrideHeader map[string][]string `ini:"-"`
Base64EmbedImages bool `ini:"BASE64_EMBED_IMAGES"`
Name string `ini:"NAME"`
From string `ini:"FROM"`
EnvelopeFrom string `ini:"ENVELOPE_FROM"`
OverrideEnvelopeFrom bool `ini:"-"`
FromName string `ini:"-"`
FromEmail string `ini:"-"`
SendAsPlainText bool `ini:"SEND_AS_PLAIN_TEXT"`
SubjectPrefix string `ini:"SUBJECT_PREFIX"`
OverrideHeader map[string][]string `ini:"-"`
Base64EmbedImages bool `ini:"BASE64_EMBED_IMAGES"`
Base64EmbedImagesMaxSizePerAttachment int64 `ini:"BASE64_EMBED_IMAGES_MAX_SIZE_PER_ATTACHMENT"`
// SMTP sender
Protocol string `ini:"PROTOCOL"`
@ -152,6 +153,7 @@ func loadMailerFrom(rootCfg ConfigProvider) {
sec.Key("SENDMAIL_CONVERT_CRLF").MustBool(true)
sec.Key("FROM").MustString(sec.Key("USER").String())
sec.Key("BASE64_EMBED_IMAGES").MustBool(false)
sec.Key("BASE64_EMBED_IMAGES_MAX_SIZE_PER_ATTACHMENT").MustInt64(5 * 1024 * 1024)
// Now map the values on to the MailService
MailService = &Mailer{}

22
services/mailer/mail.go
View File

@ -21,7 +21,9 @@ import (
activities_model "code.gitea.io/gitea/models/activities"
issues_model "code.gitea.io/gitea/models/issues"
access_model "code.gitea.io/gitea/models/perm/access"
repo_model "code.gitea.io/gitea/models/repo"
"code.gitea.io/gitea/models/unit"
user_model "code.gitea.io/gitea/models/user"
"code.gitea.io/gitea/modules/base"
"code.gitea.io/gitea/modules/emoji"
@ -421,6 +423,7 @@ func Base64InlineImages(body string, ctx *MailCommentContext) (string, error) {
}
func AttachmentSrcToBase64DataURI(attachmentPath string, ctx *MailCommentContext) (string, error) {
maxSizePerImageAttachment := setting.MailService.Base64EmbedImagesMaxSizePerAttachment
if !strings.HasPrefix(attachmentPath, setting.AppURL) { // external image
return "", fmt.Errorf("external image")
}
@ -435,6 +438,16 @@ func AttachmentSrcToBase64DataURI(attachmentPath string, ctx *MailCommentContext
return "", err
}
// "Doer" is theoretically not the correct permission check (as Doer created the action on which to send), but as this is batch processed the receipants can't be accessed.
// Therefore we check the Doer, with which we counter leaking information as a Doer brute force attack on attachments would be possible.
perm, err := access_model.GetUserRepoPermission(ctx, ctx.Issue.Repo, ctx.Doer)
if err != nil {
return "", err
}
if !perm.CanRead(unit.TypeIssues) {
return "", fmt.Errorf("no permission")
}
fr, err := storage.Attachments.Open(attachment.RelativePath())
if err != nil {
return "", err
@ -446,7 +459,16 @@ func AttachmentSrcToBase64DataURI(attachmentPath string, ctx *MailCommentContext
return "", err
}
if len(content) > int(maxSizePerImageAttachment) {
return "", fmt.Errorf("image too large (%d bytes) of max %d bytes", len(content), maxSizePerImageAttachment)
}
mimeType := http.DetectContentType(content)
if !strings.HasPrefix(mimeType, "image/") {
return "", fmt.Errorf("not an image")
}
encoded := base64.StdEncoding.EncodeToString(content)
dataURI := fmt.Sprintf("data:%s;base64,%s", mimeType, encoded)