mirror of
https://codeberg.org/forgejo/forgejo.git
synced 2026-03-25 17:13:03 -04:00
f93d2cb261
One of the security patches released 2026-03-09 [fixed a vulnerability](d1c7b04d09) caused by a misapplication of Go `case` statements, where the implementation would have been correct if Go `case` statements automatically fall through to the next case block, but they do not. This PR adds a semgrep rule which detects any empty `case` statement and raises an error, in order to prevent this coding mistake in the future.
For example, code like this will now trigger a build error:
```go
switch setting.Protocol {
case setting.HTTPUnix:
case setting.FCGI:
case setting.FCGIUnix:
default:
defaultLocalURL := string(setting.Protocol) + "://"
}
```
Example error:
```
cmd/web.go
❯❯❱ semgrep.config.forgejo-switch-empty-case
switch has a case block with no content. This is treated as "break" by Go, but developers may
confuse it for "fallthrough". To fix this error, disambiguate by using "break" or
"fallthrough".
279┆ switch setting.Protocol {
280┆ case setting.HTTPUnix:
281┆ case setting.FCGI:
282┆ case setting.FCGIUnix:
283┆ default:
284┆ defaultLocalURL := string(setting.Protocol) + "://"
285┆ if setting.HTTPAddr == "0.0.0.0" {
286┆ defaultLocalURL += "localhost"
287┆ } else {
288┆ defaultLocalURL += setting.HTTPAddr
```
As described in the error output, this error can be fixed by explicitly listing `break` (the real Go behaviour, to do nothing in the block), or by listing `fallthrough` (if the intent was to fall through).
All existing code triggering this detection has been changed to `break` (or, rarely, irrelevant cases have been removed), which should maintain the same code functionality. While performing this fixup, a light analysis was performed on each case and they *appeared* correct, but with ~65 cases I haven't gone into extreme depth.
Tests are present for the semgrep rule in `.semgrep/tests/go.go`.
## Checklist
The [contributor guide](https://forgejo.org/docs/next/contributor/) contains information that will be helpful to first time contributors. There also are a few [conditions for merging Pull Requests in Forgejo repositories](https://codeberg.org/forgejo/governance/src/branch/main/PullRequestsAgreement.md). You are also welcome to join the [Forgejo development chatroom](https://matrix.to/#/#forgejo-development:matrix.org).
### Documentation
- [ ] I created a pull request [to the documentation](https://codeberg.org/forgejo/docs) to explain to Forgejo users how to use this change.
- [x] I did not document these changes and I do not expect someone else to do it.
### Release notes
- [ ] This change will be noticed by a Forgejo user or admin (feature, bug fix, performance, etc.). I suggest to include a release note for this change.
- [x] This change is not visible to a Forgejo user or admin (refactor, dependency upgrade, etc.). I think there is no need to add a release note for this change.
Reviewed-on: https://codeberg.org/forgejo/forgejo/pulls/11593
Reviewed-by: Gusted <gusted@noreply.codeberg.org>
Co-authored-by: Mathieu Fenniak <mathieu@fenniak.net>
Co-committed-by: Mathieu Fenniak <mathieu@fenniak.net>
86 lines
2.2 KiB
Go
86 lines
2.2 KiB
Go
// Copyright 2019 The Gitea Authors. All rights reserved.
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// SPDX-License-Identifier: MIT
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package setting
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import (
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"strings"
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"time"
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"forgejo.org/modules/log"
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)
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// Cache represents cache settings
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type Cache struct {
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Adapter string
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Interval int
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Conn string
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TTL time.Duration `ini:"ITEM_TTL"`
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}
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// CacheService the global cache
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var CacheService = struct {
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Cache `ini:"cache"`
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LastCommit struct {
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TTL time.Duration `ini:"ITEM_TTL"`
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CommitsCount int64
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} `ini:"cache.last_commit"`
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}{
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Cache: Cache{
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Adapter: "memory",
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Interval: 60,
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TTL: 16 * time.Hour,
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},
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LastCommit: struct {
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TTL time.Duration `ini:"ITEM_TTL"`
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CommitsCount int64
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}{
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TTL: 8760 * time.Hour,
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CommitsCount: 1000,
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},
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}
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// MemcacheMaxTTL represents the maximum memcache TTL
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const MemcacheMaxTTL = 30 * 24 * time.Hour
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func loadCacheFrom(rootCfg ConfigProvider) {
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sec := rootCfg.Section("cache")
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if err := sec.MapTo(&CacheService); err != nil {
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log.Fatal("Failed to map Cache settings: %v", err)
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}
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CacheService.Adapter = sec.Key("ADAPTER").In("memory", []string{"memory", "redis", "memcache", "twoqueue"})
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switch CacheService.Adapter {
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case "memory":
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break
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case "redis", "memcache":
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CacheService.Conn = strings.Trim(sec.Key("HOST").String(), "\" ")
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case "twoqueue":
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CacheService.Conn = strings.TrimSpace(sec.Key("HOST").String())
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if CacheService.Conn == "" {
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CacheService.Conn = "50000"
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}
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default:
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log.Fatal("Unknown cache adapter: %s", CacheService.Adapter)
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}
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sec = rootCfg.Section("cache.last_commit")
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CacheService.LastCommit.CommitsCount = sec.Key("COMMITS_COUNT").MustInt64(1000)
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}
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// TTLSeconds returns the TTLSeconds or unix timestamp for memcache
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func (c Cache) TTLSeconds() int64 {
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if c.Adapter == "memcache" && c.TTL > MemcacheMaxTTL {
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return time.Now().Add(c.TTL).Unix()
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}
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return int64(c.TTL.Seconds())
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}
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// LastCommitCacheTTLSeconds returns the TTLSeconds or unix timestamp for memcache
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func LastCommitCacheTTLSeconds() int64 {
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if CacheService.Adapter == "memcache" && CacheService.LastCommit.TTL > MemcacheMaxTTL {
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return time.Now().Add(CacheService.LastCommit.TTL).Unix()
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}
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return int64(CacheService.LastCommit.TTL.Seconds())
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}
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