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Fix runaway allocation on /v2/_catalog

Browse source 
Introduced a Catalog entry in the configuration struct. With it,
it's possible to control the maximum amount of entries returned
by /v2/catalog (`GetCatalog` in registry/handlers/catalog.go).

It's set to a default value of 1000.

`GetCatalog` returns 100 entries by default if no `n` is
provided. When provided it will be validated to be between `0`
and `MaxEntries` defined in Configuration. When `n` is outside
the aforementioned boundary, an error response is returned.

`GetCatalog` now handles `n=0` gracefully with an empty response
as well.

Signed-off-by: José D. Gómez R. <1josegomezr@gmail.com>
This commit is contained in:
Jose D. Gomez R 2023-03-31 13:16:29 +02:00
parent cf87e8d07e
commit 4c1561e9fb
No known key found for this signature in database
GPG key ID: 8F018AD634A95BCD
6 changed files with 371 additions and 57 deletions
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18
configuration/configuration.go
View file

@ -197,7 +197,8 @@ type Configuration struct {
} `yaml:"pool,omitempty"`
} `yaml:"redis,omitempty"`
Health Health `yaml:"health,omitempty"`
Health Health `yaml:"health,omitempty"`
Catalog Catalog `yaml:"catalog,omitempty"`
Proxy Proxy `yaml:"proxy,omitempty"`
@ -260,6 +261,16 @@ type Configuration struct {
} `yaml:"policy,omitempty"`
}
// Catalog is composed of MaxEntries.
// Catalog endpoint (/v2/_catalog) configuration, it provides the configuration
// options to control the maximum number of entries returned by the catalog endpoint.
type Catalog struct {
// Max number of entries returned by the catalog endpoint. Requesting n entries
// to the catalog endpoint will return at most MaxEntries entries.
// An empty or a negative value will set a default of 1000 maximum entries by default.
MaxEntries int `yaml:"maxentries,omitempty"`
}
// LogHook is composed of hook Level and Type.
// After hooks configuration, it can execute the next handling automatically,
// when defined levels of log message emitted.
@ -686,6 +697,11 @@ func Parse(rd io.Reader) (*Configuration, error) {
if v0_1.Loglevel != Loglevel("") {
v0_1.Loglevel = Loglevel("")
}
if v0_1.Catalog.MaxEntries <= 0 {
v0_1.Catalog.MaxEntries = 1000
}
if v0_1.Storage.Type() == "" {
return nil, errors.New("no storage configuration provided")
}

4
configuration/configuration_test.go
View file

@ -70,6 +70,9 @@ var configStruct = Configuration{
},
},
},
Catalog: Catalog{
MaxEntries: 1000,
},
HTTP: struct {
Addr string `yaml:"addr,omitempty"`
Net string `yaml:"net,omitempty"`
@ -521,6 +524,7 @@ func copyConfig(config Configuration) *Configuration {
configCopy.Version = MajorMinorVersion(config.Version.Major(), config.Version.Minor())
configCopy.Loglevel = config.Loglevel
configCopy.Log = config.Log
configCopy.Catalog = config.Catalog
configCopy.Log.Fields = make(map[string]interface{}, len(config.Log.Fields))
for k, v := range config.Log.Fields {
configCopy.Log.Fields[k] = v

29
registry/api/v2/descriptors.go
View file

@ -134,6 +134,19 @@ var (
},
}
invalidPaginationResponseDescriptor = ResponseDescriptor{
Name: "Invalid pagination number",
Description: "The received parameter n was invalid in some way, as described by the error code. The client should resolve the issue and retry the request.",
StatusCode: http.StatusBadRequest,
Body: BodyDescriptor{
ContentType: "application/json",
Format: errorsBody,
},
ErrorCodes: []errcode.ErrorCode{
ErrorCodePaginationNumberInvalid,
},
}
repositoryNotFoundResponseDescriptor = ResponseDescriptor{
Name: "No Such Repository Error",
StatusCode: http.StatusNotFound,
@ -489,18 +502,7 @@ var routeDescriptors = []RouteDescriptor{
},
},
Failures: []ResponseDescriptor{
{
Name: "Invalid pagination number",
Description: "The received parameter n was invalid in some way, as described by the error code. The client should resolve the issue and retry the request.",
StatusCode: http.StatusBadRequest,
Body: BodyDescriptor{
ContentType: "application/json",
Format: errorsBody,
},
ErrorCodes: []errcode.ErrorCode{
ErrorCodePaginationNumberInvalid,
},
},
invalidPaginationResponseDescriptor,
unauthorizedResponseDescriptor,
repositoryNotFoundResponseDescriptor,
deniedResponseDescriptor,
@ -1589,6 +1591,9 @@ var routeDescriptors = []RouteDescriptor{
},
},
},
Failures: []ResponseDescriptor{
invalidPaginationResponseDescriptor,
},
},
},
},

3
registry/api/v2/errors.go
View file

@ -151,7 +151,8 @@ var (
Value: "PAGINATION_NUMBER_INVALID",
Message: "invalid number of results requested",
Description: `Returned when the "n" parameter (number of results
to return) is not an integer, or "n" is negative.`,
to return) is not an integer, "n" is negative or "n" is bigger than
the maximum allowed.`,
HTTPStatusCode: http.StatusBadRequest,
})
)

318
registry/handlers/api_test.go
View file

@ -80,22 +80,23 @@ func TestCheckAPI(t *testing.T) {
// TestCatalogAPI tests the /v2/_catalog endpoint
func TestCatalogAPI(t *testing.T) {
chunkLen := 2
env := newTestEnv(t, false)
defer env.Shutdown()
values := url.Values{
"last": []string{""},
"n": []string{strconv.Itoa(chunkLen)},
maxEntries := env.config.Catalog.MaxEntries
allCatalog := []string{
"foo/aaaa", "foo/bbbb", "foo/cccc", "foo/dddd", "foo/eeee", "foo/ffff",
}
catalogURL, err := env.builder.BuildCatalogURL(values)
chunkLen := maxEntries - 1
catalogURL, err := env.builder.BuildCatalogURL()
if err != nil {
t.Fatalf("unexpected error building catalog url: %v", err)
}
// -----------------------------------
// try to get an empty catalog
// Case No. 1: Empty catalog
resp, err := http.Get(catalogURL)
if err != nil {
t.Fatalf("unexpected error issuing request: %v", err)
@ -113,23 +114,23 @@ func TestCatalogAPI(t *testing.T) {
t.Fatalf("error decoding fetched manifest: %v", err)
}
// we haven't pushed anything to the registry yet
// No images pushed = no image returned
if len(ctlg.Repositories) != 0 {
t.Fatalf("repositories has unexpected values")
t.Fatalf("repositories returned unexpected entries (expected: %d, returned: %d)", 0, len(ctlg.Repositories))
}
// No pagination should be returned
if resp.Header.Get("Link") != "" {
t.Fatalf("repositories has more data when none expected")
}
// -----------------------------------
// push something to the registry and try again
images := []string{"foo/aaaa", "foo/bbbb", "foo/cccc"}
for _, image := range images {
for _, image := range allCatalog {
createRepository(env, t, image, "sometag")
}
// -----------------------------------
// Case No. 2: Catalog populated & n is not provided nil (n internally will be min(100, maxEntries))
resp, err = http.Get(catalogURL)
if err != nil {
t.Fatalf("unexpected error issuing request: %v", err)
@ -143,27 +144,30 @@ func TestCatalogAPI(t *testing.T) {
t.Fatalf("error decoding fetched manifest: %v", err)
}
if len(ctlg.Repositories) != chunkLen {
t.Fatalf("repositories has unexpected values")
// it must match max entries
if len(ctlg.Repositories) != maxEntries {
t.Fatalf("repositories returned unexpected entries (expected: %d, returned: %d)", maxEntries, len(ctlg.Repositories))
}
for _, image := range images[:chunkLen] {
// it must return the first maxEntries entries from the catalog
for _, image := range allCatalog[:maxEntries] {
if !contains(ctlg.Repositories, image) {
t.Fatalf("didn't find our repository '%s' in the catalog", image)
}
}
// fail if there's no pagination
link := resp.Header.Get("Link")
if link == "" {
t.Fatalf("repositories has less data than expected")
}
newValues := checkLink(t, link, chunkLen, ctlg.Repositories[len(ctlg.Repositories)-1])
// -----------------------------------
// get the last chunk of data
// Case No. 2.1: Second page (n internally will be min(100, maxEntries))
catalogURL, err = env.builder.BuildCatalogURL(newValues)
// build pagination link
values := checkLink(t, link, maxEntries, ctlg.Repositories[len(ctlg.Repositories)-1])
catalogURL, err = env.builder.BuildCatalogURL(values)
if err != nil {
t.Fatalf("unexpected error building catalog url: %v", err)
}
@ -181,18 +185,267 @@ func TestCatalogAPI(t *testing.T) {
t.Fatalf("error decoding fetched manifest: %v", err)
}
if len(ctlg.Repositories) != 1 {
t.Fatalf("repositories has unexpected values")
expectedRemainder := len(allCatalog) - maxEntries
if len(ctlg.Repositories) != expectedRemainder {
t.Fatalf("repositories returned unexpected entries (expected: %d, returned: %d)", expectedRemainder, len(ctlg.Repositories))
}
lastImage := images[len(images)-1]
if !contains(ctlg.Repositories, lastImage) {
t.Fatalf("didn't find our repository '%s' in the catalog", lastImage)
// -----------------------------------
// Case No. 3: request n = maxentries
values = url.Values{
"last": []string{""},
"n": []string{strconv.Itoa(maxEntries)},
}
catalogURL, err = env.builder.BuildCatalogURL(values)
if err != nil {
t.Fatalf("unexpected error building catalog url: %v", err)
}
resp, err = http.Get(catalogURL)
if err != nil {
t.Fatalf("unexpected error issuing request: %v", err)
}
defer resp.Body.Close()
checkResponse(t, "issuing catalog api check", resp, http.StatusOK)
dec = json.NewDecoder(resp.Body)
if err = dec.Decode(&ctlg); err != nil {
t.Fatalf("error decoding fetched manifest: %v", err)
}
if len(ctlg.Repositories) != maxEntries {
t.Fatalf("repositories returned unexpected entries (expected: %d, returned: %d)", maxEntries, len(ctlg.Repositories))
}
// fail if there's no pagination
link = resp.Header.Get("Link")
if link != "" {
t.Fatalf("catalog has unexpected data")
if link == "" {
t.Fatalf("repositories has less data than expected")
}
// -----------------------------------
// Case No. 3.1: Second (last) page
// build pagination link
values = checkLink(t, link, maxEntries, ctlg.Repositories[len(ctlg.Repositories)-1])
catalogURL, err = env.builder.BuildCatalogURL(values)
if err != nil {
t.Fatalf("unexpected error building catalog url: %v", err)
}
resp, err = http.Get(catalogURL)
if err != nil {
t.Fatalf("unexpected error issuing request: %v", err)
}
defer resp.Body.Close()
checkResponse(t, "issuing catalog api check", resp, http.StatusOK)
dec = json.NewDecoder(resp.Body)
if err = dec.Decode(&ctlg); err != nil {
t.Fatalf("error decoding fetched manifest: %v", err)
}
expectedRemainder = len(allCatalog) - maxEntries
if len(ctlg.Repositories) != expectedRemainder {
t.Fatalf("repositories returned unexpected entries (expected: %d, returned: %d)", expectedRemainder, len(ctlg.Repositories))
}
// -----------------------------------
// Case No. 4: request n < maxentries
values = url.Values{
"n": []string{strconv.Itoa(chunkLen)},
}
catalogURL, err = env.builder.BuildCatalogURL(values)
if err != nil {
t.Fatalf("unexpected error building catalog url: %v", err)
}
resp, err = http.Get(catalogURL)
if err != nil {
t.Fatalf("unexpected error issuing request: %v", err)
}
defer resp.Body.Close()
checkResponse(t, "issuing catalog api check", resp, http.StatusOK)
dec = json.NewDecoder(resp.Body)
if err = dec.Decode(&ctlg); err != nil {
t.Fatalf("error decoding fetched manifest: %v", err)
}
// returns the requested amount
if len(ctlg.Repositories) != chunkLen {
t.Fatalf("repositories returned unexpected entries (expected: %d, returned: %d)", expectedRemainder, len(ctlg.Repositories))
}
// fail if there's no pagination
link = resp.Header.Get("Link")
if link == "" {
t.Fatalf("repositories has less data than expected")
}
// -----------------------------------
// Case No. 4.1: request n < maxentries (second page)
// build pagination link
values = checkLink(t, link, chunkLen, ctlg.Repositories[len(ctlg.Repositories)-1])
catalogURL, err = env.builder.BuildCatalogURL(values)
if err != nil {
t.Fatalf("unexpected error building catalog url: %v", err)
}
resp, err = http.Get(catalogURL)
if err != nil {
t.Fatalf("unexpected error issuing request: %v", err)
}
defer resp.Body.Close()
checkResponse(t, "issuing catalog api check", resp, http.StatusOK)
dec = json.NewDecoder(resp.Body)
if err = dec.Decode(&ctlg); err != nil {
t.Fatalf("error decoding fetched manifest: %v", err)
}
expectedRemainder = len(allCatalog) - chunkLen
if len(ctlg.Repositories) != expectedRemainder {
t.Fatalf("repositories returned unexpected entries (expected: %d, returned: %d)", expectedRemainder, len(ctlg.Repositories))
}
// -----------------------------------
// Case No. 5: request n > maxentries
values = url.Values{
"n": []string{strconv.Itoa(maxEntries + 10)},
}
catalogURL, err = env.builder.BuildCatalogURL(values)
if err != nil {
t.Fatalf("unexpected error building catalog url: %v", err)
}
resp, err = http.Get(catalogURL)
if err != nil {
t.Fatalf("unexpected error issuing request: %v", err)
}
defer resp.Body.Close()
checkResponse(t, "issuing catalog api check", resp, http.StatusBadRequest)
checkBodyHasErrorCodes(t, "invalid number of results requested", resp, v2.ErrorCodePaginationNumberInvalid)
// -----------------------------------
// Case No. 6: request n > maxentries but <= total catalog
values = url.Values{
"n": []string{strconv.Itoa(len(allCatalog))},
}
catalogURL, err = env.builder.BuildCatalogURL(values)
if err != nil {
t.Fatalf("unexpected error building catalog url: %v", err)
}
resp, err = http.Get(catalogURL)
if err != nil {
t.Fatalf("unexpected error issuing request: %v", err)
}
defer resp.Body.Close()
checkResponse(t, "issuing catalog api check", resp, http.StatusBadRequest)
checkBodyHasErrorCodes(t, "invalid number of results requested", resp, v2.ErrorCodePaginationNumberInvalid)
// -----------------------------------
// Case No. 7: n = 0
values = url.Values{
"n": []string{"0"},
}
catalogURL, err = env.builder.BuildCatalogURL(values)
if err != nil {
t.Fatalf("unexpected error building catalog url: %v", err)
}
resp, err = http.Get(catalogURL)
if err != nil {
t.Fatalf("unexpected error issuing request: %v", err)
}
defer resp.Body.Close()
checkResponse(t, "issuing catalog api check", resp, http.StatusOK)
dec = json.NewDecoder(resp.Body)
if err = dec.Decode(&ctlg); err != nil {
t.Fatalf("error decoding fetched manifest: %v", err)
}
// it must match max entries
if len(ctlg.Repositories) != 0 {
t.Fatalf("repositories returned unexpected entries (expected: %d, returned: %d)", 0, len(ctlg.Repositories))
}
// -----------------------------------
// Case No. 8: n = -1
values = url.Values{
"n": []string{"-1"},
}
catalogURL, err = env.builder.BuildCatalogURL(values)
if err != nil {
t.Fatalf("unexpected error building catalog url: %v", err)
}
resp, err = http.Get(catalogURL)
if err != nil {
t.Fatalf("unexpected error issuing request: %v", err)
}
defer resp.Body.Close()
checkResponse(t, "issuing catalog api check", resp, http.StatusBadRequest)
checkBodyHasErrorCodes(t, "invalid number of results requested", resp, v2.ErrorCodePaginationNumberInvalid)
// -----------------------------------
// Case No. 9: n = 5, max = 5, total catalog = 4
values = url.Values{
"n": []string{strconv.Itoa(maxEntries)},
}
envWithLessImages := newTestEnv(t, false)
for _, image := range allCatalog[0:(maxEntries - 1)] {
createRepository(envWithLessImages, t, image, "sometag")
}
catalogURL, err = envWithLessImages.builder.BuildCatalogURL(values)
if err != nil {
t.Fatalf("unexpected error building catalog url: %v", err)
}
resp, err = http.Get(catalogURL)
if err != nil {
t.Fatalf("unexpected error issuing request: %v", err)
}
defer resp.Body.Close()
checkResponse(t, "issuing catalog api check", resp, http.StatusOK)
dec = json.NewDecoder(resp.Body)
if err = dec.Decode(&ctlg); err != nil {
t.Fatalf("error decoding fetched manifest: %v", err)
}
// it must match max entries
if len(ctlg.Repositories) != maxEntries-1 {
t.Fatalf("repositories returned unexpected entries (expected: %d, returned: %d)", maxEntries-1, len(ctlg.Repositories))
}
}
@ -363,7 +616,7 @@ func checkLink(t *testing.T, urlStr string, numEntries int, last string) url.Val
urlValues := linkURL.Query()
if urlValues.Get("n") != strconv.Itoa(numEntries) {
t.Fatalf("Catalog link entry size is incorrect")
t.Fatalf("Catalog link entry size is incorrect (expected: %v, returned: %v)", urlValues.Get("n"), strconv.Itoa(numEntries))
}
if urlValues.Get("last") != last {
@ -2299,6 +2552,9 @@ func newTestEnvMirror(t *testing.T, deleteEnabled bool) *testEnv {
Proxy: configuration.Proxy{
RemoteURL: upstreamEnv.server.URL,
},
Catalog: configuration.Catalog{
MaxEntries: 5,
},
}
config.Compatibility.Schema1.Enabled = true
@ -2314,6 +2570,9 @@ func newTestEnv(t *testing.T, deleteEnabled bool) *testEnv {
"enabled": false,
}},
},
Catalog: configuration.Catalog{
MaxEntries: 5,
},
}
config.Compatibility.Schema1.Enabled = true
@ -2594,7 +2853,6 @@ func checkResponse(t *testing.T, msg string, resp *http.Response, expectedStatus
if resp.StatusCode != expectedStatus {
t.Logf("unexpected status %s: %v != %v", msg, resp.StatusCode, expectedStatus)
maybeDumpResponse(t, resp)
t.FailNow()
}

56
registry/handlers/catalog.go
View file

@ -9,11 +9,12 @@ import (
"strconv"
"github.com/distribution/distribution/v3/registry/api/errcode"
v2 "github.com/distribution/distribution/v3/registry/api/v2"
"github.com/distribution/distribution/v3/registry/storage/driver"
"github.com/gorilla/handlers"
)
const maximumReturnedEntries = 100
const defaultReturnedEntries = 100
func catalogDispatcher(ctx *Context, r *http.Request) http.Handler {
catalogHandler := &catalogHandler{
@ -38,29 +39,58 @@ func (ch *catalogHandler) GetCatalog(w http.ResponseWriter, r *http.Request) {
q := r.URL.Query()
lastEntry := q.Get("last")
maxEntries, err := strconv.Atoi(q.Get("n"))
if err != nil || maxEntries < 0 {
maxEntries = maximumReturnedEntries
entries := defaultReturnedEntries
maximumConfiguredEntries := ch.App.Config.Catalog.MaxEntries
// parse n, if n is negative abort with an error
if n := q.Get("n"); n != "" {
parsedMax, err := strconv.Atoi(n)
if err != nil || parsedMax < 0 {
ch.Errors = append(ch.Errors, v2.ErrorCodePaginationNumberInvalid.WithDetail(map[string]string{"n": n}))
return
}
// if a client requests more than it's allowed to receive
if parsedMax > maximumConfiguredEntries {
ch.Errors = append(ch.Errors, v2.ErrorCodePaginationNumberInvalid.WithDetail(map[string]int{"n": parsedMax}))
return
}
entries = parsedMax
}
repos := make([]string, maxEntries)
// then enforce entries to be between 0 & maximumConfiguredEntries
// max(0, min(entries, maximumConfiguredEntries))
if entries < 0 || entries > maximumConfiguredEntries {
entries = maximumConfiguredEntries
}
filled, err := ch.App.registry.Repositories(ch.Context, repos, lastEntry)
_, pathNotFound := err.(driver.PathNotFoundError)
repos := make([]string, entries)
filled := 0
if err == io.EOF || pathNotFound {
// entries is guaranteed to be >= 0 and < maximumConfiguredEntries
if entries == 0 {
moreEntries = false
} else if err != nil {
ch.Errors = append(ch.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
return
} else {
returnedRepositories, err := ch.App.registry.Repositories(ch.Context, repos, lastEntry)
if err != nil {
_, pathNotFound := err.(driver.PathNotFoundError)
if err != io.EOF && !pathNotFound {
ch.Errors = append(ch.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
return
}
// err is either io.EOF or not PathNotFoundError
moreEntries = false
}
filled = returnedRepositories
}
w.Header().Set("Content-Type", "application/json")
// Add a link header if there are more entries to retrieve
if moreEntries {
lastEntry = repos[len(repos)-1]
urlStr, err := createLinkEntry(r.URL.String(), maxEntries, lastEntry)
lastEntry = repos[filled-1]
urlStr, err := createLinkEntry(r.URL.String(), entries, lastEntry)
if err != nil {
ch.Errors = append(ch.Errors, errcode.ErrorCodeUnknown.WithDetail(err))
return