| | varnish-cache/bin/varnishd/http2/cache_http2_hpack.c |
|---|
| 0 |
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/*- |
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* Copyright (c) 2016 Varnish Software AS |
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* All rights reserved. |
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* |
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* Author: Martin Blix Grydeland <martin@varnish-software.com> |
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* |
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* SPDX-License-Identifier: BSD-2-Clause |
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* |
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* Redistribution and use in source and binary forms, with or without |
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* modification, are permitted provided that the following conditions |
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* are met: |
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* 1. Redistributions of source code must retain the above copyright |
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* notice, this list of conditions and the following disclaimer. |
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* 2. Redistributions in binary form must reproduce the above copyright |
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* notice, this list of conditions and the following disclaimer in the |
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* documentation and/or other materials provided with the distribution. |
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* |
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
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* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE |
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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* SUCH DAMAGE. |
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* |
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*/ |
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|
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#include "config.h" |
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|
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#include "cache/cache_varnishd.h" |
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|
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#include <ctype.h> |
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#include <stdio.h> |
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|
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#include "http2/cache_http2.h" |
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#include "vct.h" |
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|
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// rfc9113,l,2493,2528 |
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static h2_error |
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11400 |
h2h_checkhdr(const struct http *hp, const char *b, size_t namelen, size_t len) |
| 44 |
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{ |
| 45 |
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const char *p; |
| 46 |
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enum { |
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FLD_NAME_FIRST, |
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FLD_NAME, |
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FLD_VALUE_FIRST, |
| 50 |
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FLD_VALUE |
| 51 |
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} state; |
| 52 |
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|
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11400 |
CHECK_OBJ_NOTNULL(hp, HTTP_MAGIC); |
| 54 |
11400 |
AN(b); |
| 55 |
11400 |
assert(namelen >= 2); /* 2 chars from the ': ' that we added */ |
| 56 |
11400 |
assert(namelen <= len); |
| 57 |
11400 |
assert(b[namelen - 2] == ':'); |
| 58 |
11400 |
assert(b[namelen - 1] == ' '); |
| 59 |
|
|
| 60 |
11400 |
if (namelen == 2) { |
| 61 |
0 |
VSLb(hp->vsl, SLT_BogoHeader, "Empty name"); |
| 62 |
0 |
return (H2SE_PROTOCOL_ERROR); |
| 63 |
|
} |
| 64 |
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|
| 65 |
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// VSLb(hp->vsl, SLT_Debug, "CHDR [%.*s] [%.*s]", |
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// (int)namelen, b, (int)(len - namelen), b + namelen); |
| 67 |
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|
| 68 |
11400 |
state = FLD_NAME_FIRST; |
| 69 |
88975 |
for (p = b; p < b + namelen - 2; p++) { |
| 70 |
77675 |
switch(state) { |
| 71 |
|
case FLD_NAME_FIRST: |
| 72 |
11400 |
state = FLD_NAME; |
| 73 |
11400 |
if (*p == ':') |
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9700 |
break; |
| 75 |
|
/* FALL_THROUGH */ |
| 76 |
|
case FLD_NAME: |
| 77 |
67975 |
if (isupper(*p)) { |
| 78 |
50 |
VSLb(hp->vsl, SLT_BogoHeader, |
| 79 |
|
"Illegal field header name (upper-case): %.*s", |
| 80 |
25 |
(int)(len > 20 ? 20 : len), b); |
| 81 |
25 |
return (H2SE_PROTOCOL_ERROR); |
| 82 |
|
} |
| 83 |
67950 |
if (!vct_istchar(*p) || *p == ':') { |
| 84 |
150 |
VSLb(hp->vsl, SLT_BogoHeader, |
| 85 |
|
"Illegal field header name (non-token): %.*s", |
| 86 |
75 |
(int)(len > 20 ? 20 : len), b); |
| 87 |
75 |
return (H2SE_PROTOCOL_ERROR); |
| 88 |
|
} |
| 89 |
67875 |
break; |
| 90 |
|
default: |
| 91 |
0 |
WRONG("http2 field name validation state"); |
| 92 |
0 |
} |
| 93 |
77575 |
} |
| 94 |
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|
| 95 |
11300 |
state = FLD_VALUE_FIRST; |
| 96 |
56000 |
for (p = b + namelen; p < b + len; p++) { |
| 97 |
44950 |
switch(state) { |
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|
case FLD_VALUE_FIRST: |
| 99 |
11125 |
if (vct_issp(*p)) { |
| 100 |
450 |
VSLb(hp->vsl, SLT_BogoHeader, |
| 101 |
|
"Illegal field value start %.*s", |
| 102 |
225 |
(int)(len > 20 ? 20 : len), b); |
| 103 |
225 |
return (H2SE_PROTOCOL_ERROR); |
| 104 |
|
} |
| 105 |
10900 |
state = FLD_VALUE; |
| 106 |
|
/* FALL_THROUGH */ |
| 107 |
|
case FLD_VALUE: |
| 108 |
44725 |
if (!vct_ishdrval(*p)) { |
| 109 |
50 |
VSLb(hp->vsl, SLT_BogoHeader, |
| 110 |
|
"Illegal field value %.*s", |
| 111 |
25 |
(int)(len > 20 ? 20 : len), b); |
| 112 |
25 |
return (H2SE_PROTOCOL_ERROR); |
| 113 |
|
} |
| 114 |
44700 |
break; |
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|
default: |
| 116 |
0 |
WRONG("http2 field value validation state"); |
| 117 |
0 |
} |
| 118 |
44700 |
} |
| 119 |
11050 |
if (state == FLD_VALUE && vct_issp(b[len - 1])) { |
| 120 |
100 |
VSLb(hp->vsl, SLT_BogoHeader, |
| 121 |
|
"Illegal field value (end) %.*s", |
| 122 |
50 |
(int)(len > 20 ? 20 : len), b); |
| 123 |
50 |
return (H2SE_PROTOCOL_ERROR); |
| 124 |
|
} |
| 125 |
11000 |
return (0); |
| 126 |
11400 |
} |
| 127 |
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|
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static h2_error |
| 129 |
11000 |
h2h_addhdr(struct h2h_decode *d, struct http *hp, char *b, size_t namelen, |
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|
size_t len) |
| 131 |
|
{ |
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/* XXX: This might belong in cache/cache_http.c */ |
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const char *b0; |
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int disallow_empty; |
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unsigned n; |
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char *p; |
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unsigned u; |
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|
| 139 |
11000 |
CHECK_OBJ_NOTNULL(hp, HTTP_MAGIC); |
| 140 |
11000 |
AN(b); |
| 141 |
11000 |
assert(namelen >= 2); /* 2 chars from the ': ' that we added */ |
| 142 |
11000 |
assert(namelen <= len); |
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|
|
| 144 |
11000 |
disallow_empty = 0; |
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|
|
| 146 |
11000 |
if (len > UINT_MAX) { /* XXX: cache_param max header size */ |
| 147 |
0 |
VSLb(hp->vsl, SLT_BogoHeader, "Header too large: %.20s", b); |
| 148 |
0 |
return (H2SE_ENHANCE_YOUR_CALM); |
| 149 |
|
} |
| 150 |
|
|
| 151 |
11000 |
b0 = b; |
| 152 |
11000 |
if (b[0] == ':') { |
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|
/* Match H/2 pseudo headers */ |
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|
/* XXX: Should probably have some include tbl for |
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|
pseudo-headers */ |
| 156 |
9550 |
if (!strncmp(b, ":method: ", namelen)) { |
| 157 |
3000 |
b += namelen; |
| 158 |
3000 |
len -= namelen; |
| 159 |
3000 |
n = HTTP_HDR_METHOD; |
| 160 |
3000 |
disallow_empty = 1; |
| 161 |
|
|
| 162 |
|
/* First field cannot contain SP or CTL */ |
| 163 |
12750 |
for (p = b, u = 0; u < len; p++, u++) { |
| 164 |
9750 |
if (vct_issp(*p) || vct_isctl(*p)) |
| 165 |
0 |
return (H2SE_PROTOCOL_ERROR); |
| 166 |
9750 |
} |
| 167 |
9550 |
} else if (!strncmp(b, ":path: ", namelen)) { |
| 168 |
3100 |
b += namelen; |
| 169 |
3100 |
len -= namelen; |
| 170 |
3100 |
n = HTTP_HDR_URL; |
| 171 |
3100 |
disallow_empty = 1; |
| 172 |
|
|
| 173 |
|
// rfc9113,l,2693,2705 |
| 174 |
3100 |
if (len > 0 && *b != '/' && |
| 175 |
150 |
strncmp(b, "*", len) != 0) { |
| 176 |
100 |
VSLb(hp->vsl, SLT_BogoHeader, |
| 177 |
|
"Illegal :path pseudo-header %.*s", |
| 178 |
50 |
(int)len, b); |
| 179 |
50 |
return (H2SE_PROTOCOL_ERROR); |
| 180 |
|
} |
| 181 |
|
|
| 182 |
|
/* Second field cannot contain LWS or CTL */ |
| 183 |
9600 |
for (p = b, u = 0; u < len; p++, u++) { |
| 184 |
6550 |
if (vct_islws(*p) || vct_isctl(*p)) |
| 185 |
0 |
return (H2SE_PROTOCOL_ERROR); |
| 186 |
6550 |
} |
| 187 |
6500 |
} else if (!strncmp(b, ":scheme: ", namelen)) { |
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|
/* XXX: What to do about this one? (typically |
| 189 |
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"http" or "https"). For now set it as a normal |
| 190 |
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header, stripping the first ':'. */ |
| 191 |
3025 |
if (d->has_scheme) { |
| 192 |
50 |
VSLb(hp->vsl, SLT_BogoHeader, |
| 193 |
|
"Duplicate pseudo-header %.*s%.*s", |
| 194 |
25 |
(int)namelen, b0, |
| 195 |
25 |
(int)(len > 20 ? 20 : len), b); |
| 196 |
25 |
return (H2SE_PROTOCOL_ERROR); |
| 197 |
|
} |
| 198 |
|
|
| 199 |
3000 |
b++; |
| 200 |
3000 |
len-=1; |
| 201 |
3000 |
n = hp->nhd; |
| 202 |
3000 |
d->has_scheme = 1; |
| 203 |
|
|
| 204 |
11850 |
for (p = b + namelen, u = 0; u < len-namelen; |
| 205 |
8850 |
p++, u++) { |
| 206 |
8900 |
if (vct_issp(*p) || vct_isctl(*p)) |
| 207 |
50 |
return (H2SE_PROTOCOL_ERROR); |
| 208 |
8850 |
} |
| 209 |
|
|
| 210 |
2950 |
if (!u) |
| 211 |
0 |
return (H2SE_PROTOCOL_ERROR); |
| 212 |
3375 |
} else if (!strncmp(b, ":authority: ", namelen)) { |
| 213 |
375 |
b+=6; |
| 214 |
375 |
len-=6; |
| 215 |
375 |
memcpy(b, "host", 4); |
| 216 |
375 |
n = hp->nhd; |
| 217 |
375 |
} else { |
| 218 |
|
/* Unknown pseudo-header */ |
| 219 |
100 |
VSLb(hp->vsl, SLT_BogoHeader, |
| 220 |
|
"Unknown pseudo-header: %.*s", |
| 221 |
50 |
(int)(len > 20 ? 20 : len), b); |
| 222 |
50 |
return (H2SE_PROTOCOL_ERROR); // rfc7540,l,2990,2992 |
| 223 |
|
} |
| 224 |
9375 |
} else |
| 225 |
1450 |
n = hp->nhd; |
| 226 |
|
|
| 227 |
10825 |
if (n < HTTP_HDR_FIRST) { |
| 228 |
|
/* Check for duplicate pseudo-header */ |
| 229 |
6050 |
if (hp->hd[n].b != NULL) { |
| 230 |
150 |
VSLb(hp->vsl, SLT_BogoHeader, |
| 231 |
|
"Duplicate pseudo-header %.*s%.*s", |
| 232 |
75 |
(int)namelen, b0, (int)(len > 20 ? 20 : len), b); |
| 233 |
75 |
return (H2SE_PROTOCOL_ERROR); // rfc7540,l,3158,3162 |
| 234 |
|
} |
| 235 |
5975 |
} else { |
| 236 |
|
/* Check for space in struct http */ |
| 237 |
4775 |
if (n >= hp->shd) { |
| 238 |
0 |
VSLb(hp->vsl, SLT_LostHeader, "Too many headers: %.*s", |
| 239 |
0 |
(int)(len > 20 ? 20 : len), b); |
| 240 |
0 |
return (H2SE_ENHANCE_YOUR_CALM); |
| 241 |
|
} |
| 242 |
4775 |
hp->nhd++; |
| 243 |
|
} |
| 244 |
|
|
| 245 |
10750 |
hp->hd[n].b = b; |
| 246 |
10750 |
hp->hd[n].e = b + len; |
| 247 |
|
|
| 248 |
10750 |
if (disallow_empty && !Tlen(hp->hd[n])) { |
| 249 |
200 |
VSLb(hp->vsl, SLT_BogoHeader, |
| 250 |
|
"Empty pseudo-header %.*s", |
| 251 |
100 |
(int)namelen, b0); |
| 252 |
100 |
return (H2SE_PROTOCOL_ERROR); |
| 253 |
|
} |
| 254 |
|
|
| 255 |
10650 |
return (0); |
| 256 |
11000 |
} |
| 257 |
|
|
| 258 |
|
void |
| 259 |
3800 |
h2h_decode_init(const struct h2_sess *h2) |
| 260 |
|
{ |
| 261 |
|
struct h2h_decode *d; |
| 262 |
|
|
| 263 |
3800 |
CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC); |
| 264 |
3800 |
CHECK_OBJ_NOTNULL(h2->new_req, REQ_MAGIC); |
| 265 |
3800 |
CHECK_OBJ_NOTNULL(h2->new_req->http, HTTP_MAGIC); |
| 266 |
3800 |
AN(h2->decode); |
| 267 |
3800 |
d = h2->decode; |
| 268 |
3800 |
INIT_OBJ(d, H2H_DECODE_MAGIC); |
| 269 |
3800 |
VHD_Init(d->vhd); |
| 270 |
3800 |
d->out_l = WS_ReserveAll(h2->new_req->http->ws); |
| 271 |
|
/* |
| 272 |
|
* Can't do any work without any buffer |
| 273 |
|
* space. Require non-zero size. |
| 274 |
|
*/ |
| 275 |
3800 |
XXXAN(d->out_l); |
| 276 |
3800 |
d->out = WS_Reservation(h2->new_req->http->ws); |
| 277 |
3800 |
d->reset = d->out; |
| 278 |
3800 |
} |
| 279 |
|
|
| 280 |
|
/* Possible error returns: |
| 281 |
|
* |
| 282 |
|
* H2E_COMPRESSION_ERROR: Lost compression state due to incomplete header |
| 283 |
|
* block. This is a connection level error. |
| 284 |
|
* |
| 285 |
|
* H2E_ENHANCE_YOUR_CALM: Ran out of workspace or http header space. This |
| 286 |
|
* is a stream level error. |
| 287 |
|
*/ |
| 288 |
|
h2_error |
| 289 |
3800 |
h2h_decode_fini(const struct h2_sess *h2) |
| 290 |
|
{ |
| 291 |
|
h2_error ret; |
| 292 |
|
struct h2h_decode *d; |
| 293 |
|
|
| 294 |
3800 |
CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC); |
| 295 |
3800 |
d = h2->decode; |
| 296 |
3800 |
CHECK_OBJ_NOTNULL(h2->new_req, REQ_MAGIC); |
| 297 |
3800 |
CHECK_OBJ_NOTNULL(d, H2H_DECODE_MAGIC); |
| 298 |
3800 |
WS_ReleaseP(h2->new_req->http->ws, d->out); |
| 299 |
3800 |
if (d->vhd_ret != VHD_OK) { |
| 300 |
|
/* HPACK header block didn't finish at an instruction |
| 301 |
|
boundary */ |
| 302 |
1650 |
VSLb(h2->new_req->http->vsl, SLT_BogoHeader, |
| 303 |
825 |
"HPACK compression error/fini (%s)", VHD_Error(d->vhd_ret)); |
| 304 |
825 |
ret = H2CE_COMPRESSION_ERROR; |
| 305 |
3800 |
} else if (d->error == NULL && !d->has_scheme) { |
| 306 |
100 |
VSLb(h2->vsl, SLT_Debug, "Missing :scheme"); |
| 307 |
100 |
ret = H2SE_MISSING_SCHEME; //rfc7540,l,3087,3090 |
| 308 |
100 |
} else |
| 309 |
2875 |
ret = d->error; |
| 310 |
3800 |
FINI_OBJ(d); |
| 311 |
3800 |
return (ret); |
| 312 |
|
} |
| 313 |
|
|
| 314 |
|
/* Possible error returns: |
| 315 |
|
* |
| 316 |
|
* H2E_COMPRESSION_ERROR: Lost compression state due to invalid header |
| 317 |
|
* block. This is a connection level error. |
| 318 |
|
* |
| 319 |
|
* H2E_PROTOCOL_ERROR: Malformed header or duplicate pseudo-header. |
| 320 |
|
* Violation of field name/value charsets |
| 321 |
|
*/ |
| 322 |
|
h2_error |
| 323 |
3850 |
h2h_decode_bytes(struct h2_sess *h2, const uint8_t *in, size_t in_l) |
| 324 |
|
{ |
| 325 |
|
struct http *hp; |
| 326 |
|
struct h2h_decode *d; |
| 327 |
3850 |
size_t in_u = 0; |
| 328 |
|
const char *r, *e; |
| 329 |
|
|
| 330 |
3850 |
CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC); |
| 331 |
3850 |
CHECK_OBJ_NOTNULL(h2->new_req, REQ_MAGIC); |
| 332 |
3850 |
hp = h2->new_req->http; |
| 333 |
3850 |
CHECK_OBJ_NOTNULL(hp, HTTP_MAGIC); |
| 334 |
3850 |
CHECK_OBJ_NOTNULL(hp->ws, WS_MAGIC); |
| 335 |
3850 |
r = WS_Reservation(hp->ws); |
| 336 |
3850 |
AN(r); |
| 337 |
3850 |
e = r + WS_ReservationSize(hp->ws); |
| 338 |
3850 |
d = h2->decode; |
| 339 |
3850 |
CHECK_OBJ_NOTNULL(d, H2H_DECODE_MAGIC); |
| 340 |
|
|
| 341 |
|
/* Only H2E_ENHANCE_YOUR_CALM indicates that we should continue |
| 342 |
|
processing. Other errors should have been returned and handled |
| 343 |
|
by the caller. */ |
| 344 |
3850 |
assert(d->error == 0 || d->error == H2SE_ENHANCE_YOUR_CALM); |
| 345 |
|
|
| 346 |
25925 |
while (1) { |
| 347 |
25925 |
AN(d->out); |
| 348 |
25925 |
assert(d->out_u <= d->out_l); |
| 349 |
51850 |
d->vhd_ret = VHD_Decode(d->vhd, h2->dectbl, in, in_l, &in_u, |
| 350 |
25925 |
d->out, d->out_l, &d->out_u); |
| 351 |
|
|
| 352 |
25925 |
if (d->vhd_ret < 0) { |
| 353 |
100 |
VSLb(hp->vsl, SLT_BogoHeader, |
| 354 |
|
"HPACK compression error (%s)", |
| 355 |
50 |
VHD_Error(d->vhd_ret)); |
| 356 |
50 |
d->error = H2CE_COMPRESSION_ERROR; |
| 357 |
50 |
break; |
| 358 |
25875 |
} else if (d->vhd_ret == VHD_OK || d->vhd_ret == VHD_MORE) { |
| 359 |
3050 |
assert(in_u == in_l); |
| 360 |
3050 |
break; |
| 361 |
|
} |
| 362 |
|
|
| 363 |
22825 |
if (d->error == H2SE_ENHANCE_YOUR_CALM) { |
| 364 |
0 |
d->out_u = 0; |
| 365 |
0 |
assert(d->out_u < d->out_l); |
| 366 |
0 |
continue; |
| 367 |
|
} |
| 368 |
|
|
| 369 |
22825 |
switch (d->vhd_ret) { |
| 370 |
|
case VHD_NAME_SEC: |
| 371 |
|
/* XXX: header flag for never-indexed header */ |
| 372 |
|
case VHD_NAME: |
| 373 |
11425 |
assert(d->namelen == 0); |
| 374 |
11425 |
if (d->out_l - d->out_u < 2) { |
| 375 |
0 |
d->error = H2SE_ENHANCE_YOUR_CALM; |
| 376 |
0 |
break; |
| 377 |
|
} |
| 378 |
11425 |
d->out[d->out_u++] = ':'; |
| 379 |
11425 |
d->out[d->out_u++] = ' '; |
| 380 |
11425 |
d->namelen = d->out_u; |
| 381 |
11425 |
break; |
| 382 |
|
|
| 383 |
|
case VHD_VALUE_SEC: |
| 384 |
|
/* XXX: header flag for never-indexed header */ |
| 385 |
|
case VHD_VALUE: |
| 386 |
11400 |
assert(d->namelen > 0); |
| 387 |
11400 |
if (d->out_l - d->out_u < 1) { |
| 388 |
0 |
d->error = H2SE_ENHANCE_YOUR_CALM; |
| 389 |
0 |
break; |
| 390 |
|
} |
| 391 |
22800 |
d->error = h2h_checkhdr(hp, d->out, d->namelen, |
| 392 |
11400 |
d->out_u); |
| 393 |
11400 |
if (d->error) |
| 394 |
400 |
break; |
| 395 |
22000 |
d->error = h2h_addhdr(d, hp, d->out, |
| 396 |
11000 |
d->namelen, d->out_u); |
| 397 |
11000 |
if (d->error) |
| 398 |
350 |
break; |
| 399 |
10650 |
d->out[d->out_u++] = '\0'; /* Zero guard */ |
| 400 |
10650 |
d->out += d->out_u; |
| 401 |
10650 |
d->out_l -= d->out_u; |
| 402 |
10650 |
d->out_u = 0; |
| 403 |
10650 |
d->namelen = 0; |
| 404 |
10650 |
break; |
| 405 |
|
|
| 406 |
|
case VHD_BUF: |
| 407 |
0 |
d->error = H2SE_ENHANCE_YOUR_CALM; |
| 408 |
0 |
break; |
| 409 |
|
|
| 410 |
|
default: |
| 411 |
0 |
WRONG("Unhandled return value"); |
| 412 |
0 |
break; |
| 413 |
|
} |
| 414 |
|
|
| 415 |
22825 |
if (d->error == H2SE_ENHANCE_YOUR_CALM) { |
| 416 |
0 |
d->out = d->reset; |
| 417 |
0 |
d->out_l = e - d->out; |
| 418 |
0 |
d->out_u = 0; |
| 419 |
0 |
assert(d->out_l > 0); |
| 420 |
22825 |
} else if (d->error) |
| 421 |
750 |
break; |
| 422 |
|
} |
| 423 |
|
|
| 424 |
3850 |
if (d->error == H2SE_ENHANCE_YOUR_CALM) |
| 425 |
0 |
return (0); /* Stream error, delay reporting until |
| 426 |
|
h2h_decode_fini so that we can process the |
| 427 |
|
complete header block */ |
| 428 |
3850 |
return (d->error); |
| 429 |
3850 |
} |