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[DOM] Don't allow internal MIME types to be assigned to DataTransfer

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We already blocked x-moz-file(-promise) and x-moz-place* but of course people
would find ways to abuse other internal types. This change now blocks everything
except x-moz-url types which are harmless. (i.e. whitelist instead of blacklist)
This commit is contained in:
Moonchild 2022-02-10 22:21:40 +00:00 • committed by roytam1
commit 3bcd2ee360
2 changed files with 11 additions and 11 deletions
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15
dom/events/DataTransfer.cpp
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@ -639,16 +639,11 @@ DataTransfer::PrincipalMaySetData(const nsAString& aType,
return false; return false;
} }
if (aType.EqualsASCII(kFileMime) || // Don't allow adding internal types of the form */x-moz-*, but
aType.EqualsASCII(kFilePromiseMime)) { // special-case the url types as they are simple variations of urls.
NS_WARNING("Disallowing adding x-moz-file or x-moz-file-promize types to DataTransfer"); if (FindInReadable(NS_LITERAL_STRING(kInternal_Mimetype_Prefix), aType) &&
return false; !StringBeginsWith(aType, NS_LITERAL_STRING("text/x-moz-url"))) {
} NS_WARNING("Disallowing adding requested internal type to DataTransfer");
// Disallow content from creating x-moz-place flavors, so that it cannot
// create fake Places smart queries exposing user data.
if (StringBeginsWith(aType, NS_LITERAL_STRING("text/x-moz-place"))) {
NS_WARNING("Disallowing adding moz-place types to DataTransfer");
return false; return false;
} }
} }

5
widget/nsITransferable.idl
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@ -13,6 +13,11 @@ interface nsIPrincipal;
%{ C++ %{ C++
// Internal formats must have their second part starting with 'x-moz-',
// for example text/x-moz-internaltype. These cannot be assigned by
// unprivileged content but all other types can.
#define kInternal_Mimetype_Prefix "/x-moz-"
// these probably shouldn't live here, but in some central repository shared // these probably shouldn't live here, but in some central repository shared
// by the entire app. // by the entire app.
#define kTextMime "text/plain" #define kTextMime "text/plain"