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mox/imapserver/search_test.go
Mechiel Lukkien aef99a72d8
imapserver: prevent unbounded memory allocations when handling a command 
some commands, like search, can specify any number of literals, of arbitrary
size.  we already limited individual literals to 100kb. but you could specify
many of them, causing unbounded memory consumption. this change adds a limit of
1000 literals in a command, and a limit of 1mb of total combined memory for
literals. once the limits are exceeded, a TOOBIG error code is returned.

unbounded memory use could only be triggered on authenticated connections.

this addresses the same issue as CVE-2024-34055 for cyrus-imap, by damian
poddebniak.
2024-06-10 15:00:18 +02:00

421 lines
11 KiB
Go
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package imapserver
import (
"fmt"
"strconv"
"strings"
"testing"
"time"
"github.com/mjl-/mox/imapclient"
)
var searchMsg = strings.ReplaceAll(`Date: Mon, 1 Jan 2022 10:00:00 +0100 (CEST)
From: mjl <mjl@mox.example>
Subject: mox
To: mox <mox@mox.example>
Cc: <xcc@mox.example>
Bcc: <bcc@mox.example>
Reply-To: <noreply@mox.example>
Message-Id: <123@mox.example>
MIME-Version: 1.0
Content-Type: multipart/alternative; boundary=x
--x
Content-Type: text/plain; charset=utf-8
this is plain text.
--x
Content-Type: text/html; charset=utf-8
this is html.
--x--
`, "\n", "\r\n")
func (tc *testconn) xsearch(nums ...uint32) {
tc.t.Helper()
tc.xuntagged(imapclient.UntaggedSearch(nums))
}
func (tc *testconn) xsearchmodseq(modseq int64, nums ...uint32) {
tc.t.Helper()
if len(nums) == 0 {
tc.xnountagged()
return
}
tc.xuntagged(imapclient.UntaggedSearchModSeq{Nums: nums, ModSeq: modseq})
}
func (tc *testconn) xesearch(exp imapclient.UntaggedEsearch) {
tc.t.Helper()
exp.Correlator = tc.client.LastTag
tc.xuntagged(exp)
}
func TestSearch(t *testing.T) {
tc := start(t)
defer tc.close()
tc.client.Login("mjl@mox.example", password0)
tc.client.Select("inbox")
// Add 5 and delete first 4 messages. So UIDs start at 5.
received := time.Date(2020, time.January, 1, 10, 0, 0, 0, time.UTC)
for i := 0; i < 5; i++ {
tc.client.Append("inbox", nil, &received, []byte(exampleMsg))
}
tc.client.StoreFlagsSet("1:4", true, `\Deleted`)
tc.client.Expunge()
received = time.Date(2022, time.January, 1, 9, 0, 0, 0, time.UTC)
tc.client.Append("inbox", nil, &received, []byte(searchMsg))
received = time.Date(2022, time.January, 1, 9, 0, 0, 0, time.UTC)
mostFlags := []string{
`\Deleted`,
`\Seen`,
`\Answered`,
`\Flagged`,
`\Draft`,
`$Forwarded`,
`$Junk`,
`$Notjunk`,
`$Phishing`,
`$MDNSent`,
`custom1`,
`Custom2`,
}
tc.client.Append("inbox", mostFlags, &received, []byte(searchMsg))
// We now have sequence numbers 1,2,3 and UIDs 5,6,7.
tc.transactf("ok", "search all")
tc.xsearch(1, 2, 3)
tc.transactf("ok", "uid search all")
tc.xsearch(5, 6, 7)
tc.transactf("ok", "search answered")
tc.xsearch(3)
tc.transactf("ok", `search bcc "bcc@mox.example"`)
tc.xsearch(2, 3)
tc.transactf("ok", "search before 1-Jan-2038")
tc.xsearch(1, 2, 3)
tc.transactf("ok", "search before 1-Jan-2020")
tc.xsearch() // Before is about received, not date header of message.
tc.transactf("ok", `search body "Joe"`)
tc.xsearch(1)
tc.transactf("ok", `search body "Joe" body "bogus"`)
tc.xsearch()
tc.transactf("ok", `search body "Joe" text "Blurdybloop"`)
tc.xsearch(1)
tc.transactf("ok", `search body "Joe" not text "mox"`)
tc.xsearch(1)
tc.transactf("ok", `search body "Joe" not not body "Joe"`)
tc.xsearch(1)
tc.transactf("ok", `search body "this is plain text"`)
tc.xsearch(2, 3)
tc.transactf("ok", `search body "this is html"`)
tc.xsearch(2, 3)
tc.transactf("ok", `search cc "xcc@mox.example"`)
tc.xsearch(2, 3)
tc.transactf("ok", `search deleted`)
tc.xsearch(3)
tc.transactf("ok", `search flagged`)
tc.xsearch(3)
tc.transactf("ok", `search from "foobar@Blurdybloop.example"`)
tc.xsearch(1)
tc.transactf("ok", `search keyword $Forwarded`)
tc.xsearch(3)
tc.transactf("ok", `search keyword Custom1`)
tc.xsearch(3)
tc.transactf("ok", `search keyword custom2`)
tc.xsearch(3)
tc.transactf("ok", `search new`)
tc.xsearch() // New requires a message to be recent. We pretend all messages are not recent.
tc.transactf("ok", `search old`)
tc.xsearch(1, 2, 3)
tc.transactf("ok", `search on 1-Jan-2022`)
tc.xsearch(2, 3)
tc.transactf("ok", `search recent`)
tc.xsearch()
tc.transactf("ok", `search seen`)
tc.xsearch(3)
tc.transactf("ok", `search since 1-Jan-2020`)
tc.xsearch(1, 2, 3)
tc.transactf("ok", `search subject "afternoon"`)
tc.xsearch(1)
tc.transactf("ok", `search text "Joe"`)
tc.xsearch(1)
tc.transactf("ok", `search to "mooch@owatagu.siam.edu.example"`)
tc.xsearch(1)
tc.transactf("ok", `search unanswered`)
tc.xsearch(1, 2)
tc.transactf("ok", `search undeleted`)
tc.xsearch(1, 2)
tc.transactf("ok", `search unflagged`)
tc.xsearch(1, 2)
tc.transactf("ok", `search unkeyword $Junk`)
tc.xsearch(1, 2)
tc.transactf("ok", `search unkeyword custom1`)
tc.xsearch(1, 2)
tc.transactf("ok", `search unseen`)
tc.xsearch(1, 2)
tc.transactf("ok", `search draft`)
tc.xsearch(3)
tc.transactf("ok", `search header "subject" "afternoon"`)
tc.xsearch(1)
tc.transactf("ok", `search larger 1`)
tc.xsearch(1, 2, 3)
tc.transactf("ok", `search not text "mox"`)
tc.xsearch(1)
tc.transactf("ok", `search or seen unseen`)
tc.xsearch(1, 2, 3)
tc.transactf("ok", `search or unseen seen`)
tc.xsearch(1, 2, 3)
tc.transactf("ok", `search sentbefore 8-Feb-1994`)
tc.xsearch(1)
tc.transactf("ok", `search senton 7-Feb-1994`)
tc.xsearch(1)
tc.transactf("ok", `search sentsince 6-Feb-1994`)
tc.xsearch(1, 2, 3)
tc.transactf("ok", `search smaller 9999999`)
tc.xsearch(1, 2, 3)
tc.transactf("ok", `search uid 1`)
tc.xsearch()
tc.transactf("ok", `search uid 5`)
tc.xsearch(1)
tc.transactf("ok", `search or larger 1000000 smaller 1`)
tc.xsearch()
tc.transactf("ok", `search undraft`)
tc.xsearch(1, 2)
tc.transactf("no", `search charset unknown text "mox"`)
tc.transactf("ok", `search charset us-ascii text "mox"`)
tc.xsearch(2, 3)
tc.transactf("ok", `search charset utf-8 text "mox"`)
tc.xsearch(2, 3)
esearchall := func(ss string) imapclient.UntaggedEsearch {
return imapclient.UntaggedEsearch{All: esearchall0(ss)}
}
uint32ptr := func(v uint32) *uint32 {
return &v
}
// Do new-style ESEARCH requests with RETURN. We should get an ESEARCH response.
tc.transactf("ok", "search return () all")
tc.xesearch(esearchall("1:3")) // Without any options, "ALL" is implicit.
tc.transactf("ok", "search return (min max count all) all")
tc.xesearch(imapclient.UntaggedEsearch{Min: 1, Max: 3, Count: uint32ptr(3), All: esearchall0("1:3")})
tc.transactf("ok", "UID search return (min max count all) all")
tc.xesearch(imapclient.UntaggedEsearch{UID: true, Min: 5, Max: 7, Count: uint32ptr(3), All: esearchall0("5:7")})
tc.transactf("ok", "search return (min) all")
tc.xesearch(imapclient.UntaggedEsearch{Min: 1})
tc.transactf("ok", "search return (min) 3")
tc.xesearch(imapclient.UntaggedEsearch{Min: 3})
tc.transactf("ok", "search return (min) NOT all")
tc.xesearch(imapclient.UntaggedEsearch{}) // Min not present if no match.
tc.transactf("ok", "search return (max) all")
tc.xesearch(imapclient.UntaggedEsearch{Max: 3})
tc.transactf("ok", "search return (max) 1")
tc.xesearch(imapclient.UntaggedEsearch{Max: 1})
tc.transactf("ok", "search return (max) not all")
tc.xesearch(imapclient.UntaggedEsearch{}) // Max not present if no match.
tc.transactf("ok", "search return (min max) all")
tc.xesearch(imapclient.UntaggedEsearch{Min: 1, Max: 3})
tc.transactf("ok", "search return (min max) 1")
tc.xesearch(imapclient.UntaggedEsearch{Min: 1, Max: 1})
tc.transactf("ok", "search return (min max) not all")
tc.xesearch(imapclient.UntaggedEsearch{})
tc.transactf("ok", "search return (all) not all")
tc.xesearch(imapclient.UntaggedEsearch{}) // All not present if no match.
tc.transactf("ok", "search return (min max all) not all")
tc.xesearch(imapclient.UntaggedEsearch{})
tc.transactf("ok", "search return (min max all count) not all")
tc.xesearch(imapclient.UntaggedEsearch{Count: uint32ptr(0)})
tc.transactf("ok", "search return (min max count all) 1,3")
tc.xesearch(imapclient.UntaggedEsearch{Min: 1, Max: 3, Count: uint32ptr(2), All: esearchall0("1,3")})
tc.transactf("ok", "search return (min max count all) UID 5,7")
tc.xesearch(imapclient.UntaggedEsearch{Min: 1, Max: 3, Count: uint32ptr(2), All: esearchall0("1,3")})
tc.transactf("ok", "uid search return (min max count all) 1,3")
tc.xesearch(imapclient.UntaggedEsearch{UID: true, Min: 5, Max: 7, Count: uint32ptr(2), All: esearchall0("5,7")})
tc.transactf("ok", "uid search return (min max count all) UID 5,7")
tc.xesearch(imapclient.UntaggedEsearch{UID: true, Min: 5, Max: 7, Count: uint32ptr(2), All: esearchall0("5,7")})
tc.transactf("no", `search return () charset unknown text "mox"`)
tc.transactf("ok", `search return () charset us-ascii text "mox"`)
tc.xesearch(esearchall("2:3"))
tc.transactf("ok", `search return () charset utf-8 text "mox"`)
tc.xesearch(esearchall("2:3"))
tc.transactf("bad", `search return (unknown) all`)
tc.transactf("ok", "search return (save) 2")
tc.xnountagged() // ../rfc/9051:3800
tc.transactf("ok", "fetch $ (uid)")
tc.xuntagged(imapclient.UntaggedFetch{Seq: 2, Attrs: []imapclient.FetchAttr{imapclient.FetchUID(6)}})
tc.transactf("ok", "search return (all) $")
tc.xesearch(esearchall("2"))
tc.transactf("ok", "search return (save) $")
tc.xnountagged()
tc.transactf("ok", "search return (save all) all")
tc.xesearch(esearchall("1:3"))
tc.transactf("ok", "search return (all save) all")
tc.xesearch(esearchall("1:3"))
tc.transactf("ok", "search return (min save) all")
tc.xesearch(imapclient.UntaggedEsearch{Min: 1})
tc.transactf("ok", "fetch $ (uid)")
tc.xuntagged(imapclient.UntaggedFetch{Seq: 1, Attrs: []imapclient.FetchAttr{imapclient.FetchUID(5)}})
// Do a seemingly old-style search command with IMAP4rev2 enabled. We'll still get ESEARCH responses.
tc.client.Enable("IMAP4rev2")
tc.transactf("ok", `search undraft`)
tc.xesearch(esearchall("1:2"))
// Long commands should be rejected, not allocating too much memory.
lit := make([]byte, 100*1024+1)
for i := range lit {
lit[i] = 'x'
}
writeTextLit := func(n int, expok bool) {
_, err := fmt.Fprintf(tc.client, " TEXT ")
tcheck(t, err, "write text")
_, err = fmt.Fprintf(tc.client, "{%d}\r\n", n)
tcheck(t, err, "write literal size")
line, err := tc.client.Readline()
tcheck(t, err, "read line")
if expok && !strings.HasPrefix(line, "+") {
tcheck(t, fmt.Errorf("no continuation after writing size: %s", line), "sending literal")
} else if !expok && !strings.HasPrefix(line, "x0 BAD [TOOBIG]") {
tcheck(t, fmt.Errorf("got line %s", line), "expected TOOBIG error")
}
if !expok {
return
}
_, err = tc.client.Write(lit[:n])
tcheck(t, err, "write literal data")
}
// More than 100k for a literal.
_, err := fmt.Fprintf(tc.client, "x0 uid search")
tcheck(t, err, "write start of uit search")
writeTextLit(100*1024+1, false)
// More than 1mb total for literals.
_, err = fmt.Fprintf(tc.client, "x0 uid search")
tcheck(t, err, "write start of uit search")
for i := 0; i < 10; i++ {
writeTextLit(100*1024, true)
}
writeTextLit(1, false)
// More than 1000 literals.
_, err = fmt.Fprintf(tc.client, "x0 uid search")
tcheck(t, err, "write start of uit search")
for i := 0; i < 1000; i++ {
writeTextLit(1, true)
}
writeTextLit(1, false)
}
// esearchall makes an UntaggedEsearch response with All set, for comparisons.
func esearchall0(ss string) imapclient.NumSet {
seqset := imapclient.NumSet{}
for _, rs := range strings.Split(ss, ",") {
t := strings.Split(rs, ":")
if len(t) > 2 {
panic("bad seqset")
}
var first uint32
var last *uint32
if t[0] != "*" {
v, err := strconv.ParseUint(t[0], 10, 32)
if err != nil {
panic("parse first")
}
first = uint32(v)
}
if len(t) == 2 {
if t[1] != "*" {
v, err := strconv.ParseUint(t[1], 10, 32)
if err != nil {
panic("parse last")
}
u := uint32(v)
last = &u
}
}
seqset.Ranges = append(seqset.Ranges, imapclient.NumRange{First: first, Last: last})
}
return seqset
}
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