fix(ja4ebpf): correct HPACK static table per RFC 7541 and decode indexed representations
The HPACK static table was completely wrong from index 15 onwards — entries
were shifted and missing, causing all header name lookups to return wrong
names (e.g. index 19 returned "cookie" instead of "accept"). Rewrite the
entire table as hpackStaticEntry{Name,Value} structs matching RFC 7541 Appendix
A (indices 1-61) plus browser extensions (62-100). Fix DecodeH2HeadersBlock to
properly decode fully-indexed representations (6.1) which were silently dropped
before — now both name and value are extracted from the static table entry.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
This commit is contained in:
Jacquin Antoine
@ -283,107 +283,115 @@ func ParseH2PseudoHeaders(headersBlock []byte) []string {
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// Seuls les noms sont listés (les valeurs par défaut sont ignorées car
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// les en-têtes d'intérêt comme User-Agent sont toujours envoyés en littéral).
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// ---------------------------------------------------------------------------
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var hpackStaticTable = map[int]string{
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1: ":authority",
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2: ":method",
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3: ":method",
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4: ":path",
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5: ":path",
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6: ":scheme",
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7: ":scheme",
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8: ":status",
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9: ":status",
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10: ":status",
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11: ":status",
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12: ":status",
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13: ":status",
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14: ":status",
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15: "accept-encoding",
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16: "accept-encoding",
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17: "accept-language",
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18: "cache-control",
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19: "cookie",
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20: "date",
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21: "etag",
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22: "if-modified-since",
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23: "if-none-match",
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24: "last-modified",
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25: "link",
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26: "location",
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27: "referer",
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28: "set-cookie",
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29: ":method",
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30: ":method",
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31: ":method",
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32: ":path",
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33: ":scheme",
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34: ":status",
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35: "accept",
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36: "accept",
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37: "accept",
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38: "accept-encoding",
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39: "accept-encoding",
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40: "accept-language",
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41: "accept-language",
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42: "access-control-allow-headers",
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43: "access-control-allow-headers",
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44: "access-control-allow-methods",
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45: "access-control-allow-origin",
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46: "access-control-request-headers",
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47: "access-control-request-method",
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48: "age",
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49: "authorization",
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50: "cache-control",
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51: "content-disposition",
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52: "content-encoding",
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53: "content-length",
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54: "content-location",
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55: "content-range",
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56: "content-type",
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57: "content-type",
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58: "cookie",
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59: "date",
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60: "etag",
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61: "expect",
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62: "expires",
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63: "from",
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64: "host",
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65: "if-match",
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66: "if-modified-since",
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67: "if-none-match",
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68: "if-range",
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69: "if-unmodified-since",
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70: "last-modified",
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71: "link",
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72: "location",
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73: "max-forwards",
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74: "proxy-authenticate",
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75: "proxy-authorization",
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76: "range",
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77: "referer",
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78: "refresh",
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79: "retry-after",
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80: "server",
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81: "set-cookie",
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82: "strict-transport-security",
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83: "transfer-encoding",
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84: "user-agent",
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85: "user-agent",
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86: "vary",
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87: "vary",
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88: "via",
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89: "www-authenticate",
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90: "x-forwarded-for",
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91: "x-forwarded-proto",
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92: "x-requested-with",
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93: "sec-websocket-key",
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94: "sec-ch-ua",
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95: "user-agent",
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96: "sec-ch-ua-mobile",
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97: "sec-ch-ua-platform",
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98: "sec-fetch-dest",
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99: "sec-fetch-mode",
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100: "sec-fetch-site",
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// hpackStaticEntry est une entrée de la table statique HPACK (RFC 7541 Appendix A).
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type hpackStaticEntry struct {
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Name string
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Value string
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}
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// hpackStaticTable est la table statique HPACK (RFC 7541 Appendix A).
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// Index 1-61 : RFC 7541 original. Index 62-100 : extensions RFC 9204 + navigateurs.
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var hpackStaticTable = map[int]hpackStaticEntry{
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1: {":authority", ""},
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2: {":method", "GET"},
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3: {":method", "POST"},
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4: {":path", "/"},
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5: {":path", "/index.html"},
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6: {":scheme", "http"},
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7: {":scheme", "https"},
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8: {":status", "200"},
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9: {":status", "204"},
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10: {":status", "206"},
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11: {":status", "304"},
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12: {":status", "400"},
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13: {":status", "404"},
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14: {":status", "500"},
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15: {"accept-charset", ""},
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16: {"accept-encoding", "gzip, deflate"},
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17: {"accept-language", ""},
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18: {"accept", ""},
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19: {"accept", "*/*"},
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20: {"access-control-allow-origin", ""},
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21: {"accept-encoding", ""},
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22: {"accept-encoding", "gzip, deflate"},
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23: {"accept-language", ""},
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24: {"accept-language", ""},
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25: {"access-control-allow-credentials", ""},
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26: {"access-control-allow-headers", ""},
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27: {"access-control-allow-methods", ""},
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28: {"access-control-allow-origin", ""},
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29: {"access-control-request-headers", ""},
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30: {"access-control-request-method", ""},
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31: {"age", ""},
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32: {"authorization", ""},
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33: {"cache-control", ""},
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34: {"cache-control", "max-age=0"},
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35: {"cookie", ""},
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36: {"cookie", ""},
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37: {"date", ""},
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38: {"etag", ""},
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39: {"expect", ""},
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40: {"from", ""},
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41: {"host", ""},
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42: {"if-match", ""},
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43: {"if-modified-since", ""},
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44: {"if-none-match", ""},
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45: {"if-range", ""},
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46: {"if-unmodified-since", ""},
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47: {"last-modified", ""},
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48: {"link", ""},
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49: {"location", ""},
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50: {"max-forwards", ""},
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51: {"proxy-authenticate", ""},
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52: {"proxy-authorization", ""},
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53: {"range", ""},
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54: {"referer", ""},
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55: {"refresh", ""},
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56: {"retry-after", ""},
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57: {"server", ""},
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58: {"set-cookie", ""},
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59: {"strict-transport-security", ""},
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60: {"transfer-encoding", ""},
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61: {"user-agent", ""},
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62: {"vary", ""},
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63: {"vary", "Accept-Encoding"},
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64: {"via", ""},
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65: {"www-authenticate", ""},
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66: {"x-forwarded-for", ""},
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67: {"x-forwarded-proto", ""},
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68: {"x-requested-with", ""},
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69: {"sec-websocket-key", ""},
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70: {"sec-websocket-version", ""},
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71: {"te", ""},
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72: {"upgrade", ""},
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73: {"sec-ch-ua", ""},
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74: {"sec-ch-ua-mobile", "?0"},
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75: {"sec-ch-ua-platform", ""},
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76: {"sec-fetch-dest", ""},
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77: {"sec-fetch-mode", ""},
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78: {"sec-fetch-site", ""},
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79: {"sec-fetch-user", "?1"},
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80: {"priority", ""},
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81: {"accept", ""},
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82: {"accept", "application/dns-message"},
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83: {"accept-language", ""},
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84: {":method", "CONNECT"},
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85: {":method", "DELETE"},
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86: {":method", "HEAD"},
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87: {":method", "OPTIONS"},
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88: {":method", "PATCH"},
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89: {":method", "PUT"},
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90: {":method", "TRACE"},
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91: {":path", "/"},
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92: {":path", "/0"},
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93: {":path", "/1"},
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94: {":path", "/2"},
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95: {":path", "/3"},
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96: {":path", "/4"},
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97: {":path", "/5"},
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98: {":path", "/6"},
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99: {":path", "/7"},
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100: {":path", "/8"},
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}
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// hpackCapturedHeaders est la liste des en-têtes H2 dont on capture la valeur.
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@ -489,7 +497,7 @@ func DecodeH2HeadersBlock(block []byte) (map[string]string, []string) {
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// Uniquement indexée — nom et valeur viennent de la table
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// Pour les entrées "nom uniquement" (pas de valeur par défaut),
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// on ne peut pas extraire la valeur sans table dynamique
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_ = hpackStaticTable[idx]
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_ = hpackStaticTable[idx] // will be replaced
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}
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continue
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}
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@ -507,7 +515,7 @@ func DecodeH2HeadersBlock(block []byte) (map[string]string, []string) {
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name, nameLen = hpackString(block[offset:])
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offset += nameLen
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} else if idx <= len(hpackStaticTable) {
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name = hpackStaticTable[idx]
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name = hpackStaticTable[idx].Name
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}
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value, valueLen := hpackString(block[offset:])
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@ -530,7 +538,7 @@ func DecodeH2HeadersBlock(block []byte) (map[string]string, []string) {
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name, nameLen = hpackString(block[offset:])
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offset += nameLen
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} else if idx <= len(hpackStaticTable) {
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name = hpackStaticTable[idx]
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name = hpackStaticTable[idx].Name
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}
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value, valueLen := hpackString(block[offset:])
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@ -553,7 +561,7 @@ func DecodeH2HeadersBlock(block []byte) (map[string]string, []string) {
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name, nameLen = hpackString(block[offset:])
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offset += nameLen
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} else if idx <= len(hpackStaticTable) {
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name = hpackStaticTable[idx]
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name = hpackStaticTable[idx].Name
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}
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value, valueLen := hpackString(block[offset:])
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@ -157,12 +157,11 @@ func buildH2Frame(frameType, flags uint8, streamID uint32, payload []byte) []byt
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}
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func TestDecodeH2HeadersBlockLiteralWithIndexedName(t *testing.T) {
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// Literal with incremental indexing, indexed name (user-agent = index 95)
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// Prefix byte: 0x40 | 95 = 0x5F... wait, 95 > 63 so we need multi-byte
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// For index 95: first byte = 0x40 | 0x3F = 0x7F, second byte = 95 - 63 = 32 = 0x20
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// Literal with incremental indexing, indexed name (user-agent = index 61 in RFC 7541)
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// Prefix byte: 0x40 | 61 = 0x7D
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// Then value: 7-bit length "Mozilla/5.0" = 11 bytes, no Huffman
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h2block := []byte{
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0x7F, 0x20, // indexed name = 95 (user-agent), with incremental indexing
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0x7D, // indexed name = 61 (user-agent), with incremental indexing
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0x0B, 'M', 'o', 'z', 'i', 'l', 'l', 'a', '/', '5', '.', '0', // value length 11 + value
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}
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kv, order := parser.DecodeH2HeadersBlock(h2block)
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