forked from
tangled.org/core
Monorepo for Tangled
knotserver/git: reject requests to unknown repos
Signed-off-by: Seongmin Lee <git@boltless.me>
author
Seongmin Lee
committer
![]()
tangled.org
date
(Mar 17, 2026, 7:50 AM UTC)
commit
b3222c44
b3222c44d17c5432790e43e13b47f7e89309b64b
parent
c516e353
c516e3533b269a82e818dd67bb398701ca245976
change-id
lvnwqspu
lvnwqspuwzomqqrlyzvuuvnwsoytlvqv
+64
-34
+24
-34
knotserver/git.go
+24
-34
knotserver/git.go
···
5
5
"fmt"
6
6
"io"
7
7
"net/http"
8
-
"path/filepath"
8
+
"os"
9
9
"strings"
10
10
11
-
securejoin "github.com/cyphar/filepath-securejoin"
12
11
"github.com/go-chi/chi/v5"
13
12
"tangled.org/core/knotserver/git/service"
14
13
)
15
14
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15
func (h *Knot) InfoRefs(w http.ResponseWriter, r *http.Request) {
17
-
did := chi.URLParam(r, "did")
18
16
name := chi.URLParam(r, "name")
19
-
repoName, err := securejoin.SecureJoin(did, name)
20
-
if err != nil {
21
-
gitError(w, "repository not found", http.StatusNotFound)
22
-
h.l.Error("git: failed to secure join repo path", "handler", "InfoRefs", "error", err)
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-
return
24
-
}
25
-
26
-
repoPath, err := securejoin.SecureJoin(h.c.Repo.ScanPath, repoName)
27
-
if err != nil {
28
-
gitError(w, "repository not found", http.StatusNotFound)
29
-
h.l.Error("git: failed to secure join repo path", "handler", "InfoRefs", "error", err)
17
+
repoPath, ok := repoPathFromcontext(r.Context())
18
+
if !ok {
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+
w.WriteHeader(http.StatusInternalServerError)
20
+
w.Write([]byte("Failed to find repository path"))
30
21
return
31
22
}
32
23
···
57
48
}
58
49
59
50
func (h *Knot) UploadArchive(w http.ResponseWriter, r *http.Request) {
60
-
did := chi.URLParam(r, "did")
61
-
name := chi.URLParam(r, "name")
62
-
repo, err := securejoin.SecureJoin(h.c.Repo.ScanPath, filepath.Join(did, name))
63
-
if err != nil {
64
-
gitError(w, err.Error(), http.StatusInternalServerError)
65
-
h.l.Error("git: failed to secure join repo path", "handler", "UploadPack", "error", err)
51
+
repo, ok := repoPathFromcontext(r.Context())
52
+
if !ok {
53
+
w.WriteHeader(http.StatusInternalServerError)
54
+
w.Write([]byte("Failed to find repository path"))
66
55
return
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56
}
68
57
···
104
93
}
105
94
106
95
func (h *Knot) UploadPack(w http.ResponseWriter, r *http.Request) {
107
-
did := chi.URLParam(r, "did")
108
-
name := chi.URLParam(r, "name")
109
-
repo, err := securejoin.SecureJoin(h.c.Repo.ScanPath, filepath.Join(did, name))
110
-
if err != nil {
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-
gitError(w, err.Error(), http.StatusInternalServerError)
112
-
h.l.Error("git: failed to secure join repo path", "handler", "UploadPack", "error", err)
96
+
repo, ok := repoPathFromcontext(r.Context())
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+
if !ok {
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+
w.WriteHeader(http.StatusInternalServerError)
99
+
w.Write([]byte("Failed to find repository path"))
113
100
return
114
101
}
115
102
···
153
140
}
154
141
155
142
func (h *Knot) ReceivePack(w http.ResponseWriter, r *http.Request) {
156
-
did := chi.URLParam(r, "did")
157
143
name := chi.URLParam(r, "name")
158
-
_, err := securejoin.SecureJoin(h.c.Repo.ScanPath, filepath.Join(did, name))
159
-
if err != nil {
160
-
gitError(w, err.Error(), http.StatusForbidden)
161
-
h.l.Error("git: failed to secure join repo path", "handler", "ReceivePack", "error", err)
162
-
return
163
-
}
164
-
165
144
h.RejectPush(w, r, name)
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145
}
167
146
···
190
169
fmt.Fprintf(w, " Try:\ngit remote set-url --push origin git@%s:%s/%s\n\n... and push again.", hostname, ownerHandle, unqualifiedRepoName)
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170
}
192
171
fmt.Fprintf(w, "\n\n")
172
+
}
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+
174
+
func isDir(path string) (bool, error) {
175
+
info, err := os.Stat(path)
176
+
if err == nil && info.IsDir() {
177
+
return true, nil
178
+
}
179
+
if os.IsNotExist(err) {
180
+
return false, nil
181
+
}
182
+
return false, err
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183
}
194
184
195
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func gitError(w http.ResponseWriter, msg string, status int) {
+40
knotserver/router.go
+40
knotserver/router.go
···
5
5
"fmt"
6
6
"log/slog"
7
7
"net/http"
8
+
"path/filepath"
8
9
"strings"
9
10
11
+
securejoin "github.com/cyphar/filepath-securejoin"
10
12
"github.com/go-chi/chi/v5"
11
13
"tangled.org/core/idresolver"
12
14
"tangled.org/core/jetstream"
···
81
83
82
84
r.Route("/{did}", func(r chi.Router) {
83
85
r.Use(h.resolveDidRedirect)
86
+
r.Use(h.resolveRepo)
84
87
r.Route("/{name}", func(r chi.Router) {
85
88
// routes for git operations
86
89
r.Get("/info/refs", h.InfoRefs)
···
138
141
suffix := strings.TrimPrefix(r.URL.Path, "/"+didOrHandle)
139
142
newPath := fmt.Sprintf("/%s/%s?%s", id.DID.String(), suffix, r.URL.RawQuery)
140
143
http.Redirect(w, r, newPath, http.StatusTemporaryRedirect)
144
+
})
145
+
}
146
+
147
+
type ctxRepoPathKey struct{}
148
+
149
+
func repoPathFromcontext(ctx context.Context) (string, bool) {
150
+
v, ok := ctx.Value(ctxRepoPathKey{}).(string)
151
+
return v, ok
152
+
}
153
+
154
+
// resolveRepo is a http middleware that constructs git repo path from given did & name pair.
155
+
// It will reject the requests to unknown repos (when dir doesn't exist)
156
+
func (h *Knot) resolveRepo(next http.Handler) http.Handler {
157
+
return http.HandlerFunc(func(w http.ResponseWriter, r *http.Request) {
158
+
did := chi.URLParam(r, "did")
159
+
name := chi.URLParam(r, "name")
160
+
repoPath, err := securejoin.SecureJoin(h.c.Repo.ScanPath, filepath.Join(did, name))
161
+
if err != nil {
162
+
w.WriteHeader(http.StatusNotFound)
163
+
w.Write([]byte("Repository not found"))
164
+
return
165
+
}
166
+
167
+
exist, err := isDir(repoPath)
168
+
if err != nil {
169
+
w.WriteHeader(http.StatusInternalServerError)
170
+
w.Write([]byte("Failed to check repository path"))
171
+
return
172
+
}
173
+
if !exist {
174
+
w.WriteHeader(http.StatusNotFound)
175
+
w.Write([]byte("Repository not found"))
176
+
return
177
+
}
178
+
179
+
ctx := context.WithValue(r.Context(), "repoPath", repoPath)
180
+
next.ServeHTTP(w, r.WithContext(ctx))
141
181
})
142
182
}
143
183