GCOV - Varnish Cache


/*-
 * Copyright (c) 2016 Varnish Software AS
 * All rights reserved.
 *
 * Author: Martin Blix Grydeland <martin@varnish-software.com>
 *
 * SPDX-License-Identifier: BSD-2-Clause
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in the
 *    documentation and/or other materials provided with the distribution.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED.  IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 * SUCH DAMAGE.
 *
 */

#include "config.h"

#include "cache/cache_varnishd.h"

#include <ctype.h>
#include <stdio.h>

#include "http2/cache_http2.h"
#include "vct.h"

static void
h2h_assert_ready(const struct h2h_decode *d)
{

        CHECK_OBJ_NOTNULL(d, H2H_DECODE_MAGIC);
        AN(d->out);
        assert(d->namelen >= 2); /* 2 chars from the ": " that we added */
        assert(d->namelen <= d->out_u);
        assert(d->out[d->namelen - 2] == ':');
        assert(d->out[d->namelen - 1] == ' ');
}

// rfc9113,l,2493,2528
static h2_error
h2h_checkhdr(struct vsl_log *vsl, txt nm, txt val)
{
        const char *p;
        int l;
        enum {
                FLD_NAME_FIRST,
                FLD_NAME,
                FLD_VALUE_FIRST,
                FLD_VALUE
        } state;

        if (Tlen(nm) == 0) {
                VSLb(vsl, SLT_BogoHeader, "Empty name");
                return (H2SE_PROTOCOL_ERROR);
        }

        // VSLb(vsl, SLT_Debug, "CHDR [%.*s] [%.*s]",
        //     (int)Tlen(nm), nm.b, (int)Tlen(val), val.b);

        l = vmin_t(int, Tlen(nm) + 2 + Tlen(val), 20);
        state = FLD_NAME_FIRST;
        Tforeach(p, nm) {
                switch(state) {
                case FLD_NAME_FIRST:
                        state = FLD_NAME;
                        if (*p == ':')
                                break;
                        /* FALLTHROUGH */
                case FLD_NAME:
                        if (isupper(*p)) {
                                VSLb(vsl, SLT_BogoHeader,
                                    "Illegal field header name (upper-case): %.*s",
                                    l, nm.b);
                                return (H2SE_PROTOCOL_ERROR);
                        }
                        if (!vct_istchar(*p) || *p == ':') {
                                VSLb(vsl, SLT_BogoHeader,
                                    "Illegal field header name (non-token): %.*s",
                                    l, nm.b);
                                return (H2SE_PROTOCOL_ERROR);
                        }
                        break;
                default:
                        WRONG("http2 field name validation state");
                }
        }

        state = FLD_VALUE_FIRST;
        Tforeach(p, val) {
                switch(state) {
                case FLD_VALUE_FIRST:
                        if (vct_issp(*p)) {
                                VSLb(vsl, SLT_BogoHeader,
                                    "Illegal field value 0x%02x start %.*s",
                                    *p, l, nm.b);
                                return (H2SE_PROTOCOL_ERROR);
                        }
                        state = FLD_VALUE;
                        /* FALLTHROUGH */
                case FLD_VALUE:
                        if (!vct_ishdrval(*p)) {
                                VSLb(vsl, SLT_BogoHeader,
                                    "Illegal field value 0x%02x %.*s",
                                    *p, l, nm.b);
                                return (H2SE_PROTOCOL_ERROR);
                        }
                        break;
                default:
                        WRONG("http2 field value validation state");
                }
        }
        if (state == FLD_VALUE && vct_issp(val.e[-1])) {
                VSLb(vsl, SLT_BogoHeader,
                    "Illegal field value 0x%02x (end) at %.*s",
                    val.e[-1], l, nm.b);
                return (H2SE_PROTOCOL_ERROR);
        }
        return (0);
}

static h2_error
h2h_addhdr(struct http *hp, struct h2h_decode *d)
{
        /* XXX: This might belong in cache/cache_http.c */
        txt hdr, nm, val;
        int disallow_empty;
        const char *p;
        unsigned n, has_dup;
        h2_error err;

        CHECK_OBJ_NOTNULL(hp, HTTP_MAGIC);
        h2h_assert_ready(d);

        /* Assume hdr is by default a regular header from what we decoded. */
        hdr.b = d->out;
        hdr.e = hdr.b + d->out_u;
        n = hp->nhd;

        /* nm and val are separated by ": " */
        nm.b = hdr.b;
        nm.e = nm.b + d->namelen - 2;
        val.b = nm.e + 2;
        val.e = hdr.e;

        err = h2h_checkhdr(hp->vsl, nm, val);
        if (err != NULL)
                return (err);

        disallow_empty = 0;
        has_dup = 0;

        if (Tlen(hdr) > cache_param->http_req_hdr_len) {
                VSLb(hp->vsl, SLT_BogoHeader, "Header too large: %.20s", hdr.b);
                return (H2SE_ENHANCE_YOUR_CALM);
        }

        /* Match H/2 pseudo headers */
        /* XXX: Should probably have some include tbl for pseudo-headers */
        if (!Tstrcmp(nm, ":method")) {
                hdr.b = val.b;
                n = HTTP_HDR_METHOD;
                disallow_empty = 1;

                /* Check HTTP token */
                Tforeach(p, hdr) {
                        if (!vct_istchar(*p))
                                return (H2SE_PROTOCOL_ERROR);
                }
        } else if (!Tstrcmp(nm, ":path")) {
                hdr.b = val.b;
                n = HTTP_HDR_URL;
                disallow_empty = 1;

                // rfc9113,l,2693,2705
                if (Tlen(val) > 0 && val.b[0] != '/' && Tstrcmp(val, "*")) {
                        VSLb(hp->vsl, SLT_BogoHeader,
                            "Illegal :path pseudo-header %.*s",
                            (int)Tlen(val), val.b);
                        return (H2SE_PROTOCOL_ERROR);
                }

                /* Path cannot contain LWS or CTL */
                Tforeach(p, hdr) {
                        if (vct_islws(*p) || vct_isctl(*p))
                                return (H2SE_PROTOCOL_ERROR);
                }
        } else if (!Tstrcmp(nm, ":scheme")) {
                /* XXX: What to do about this one? (typically
                   "http" or "https"). For now set it as a normal
                   header, stripping the first ':'. */
                hdr.b++;
                has_dup = d->has_scheme;
                d->has_scheme = 1;
                disallow_empty = 1;

                /* Check HTTP token */
                Tforeach(p, val) {
                        if (!vct_istchar(*p))
                                return (H2SE_PROTOCOL_ERROR);
                }
        } else if (!Tstrcmp(nm, ":authority")) {
                /* NB: we inject "host" in place of "rity" for
                 * the ":authority" pseudo-header.
                 */
                memcpy(d->out + 6, "host", 4);
                hdr.b += 6;
                nm = Tstr(":authority"); /* preserve original */
                has_dup = d->has_authority;
                d->has_authority = 1;
        } else if (nm.b[0] == ':') {
                VSLb(hp->vsl, SLT_BogoHeader,
                    "Unknown pseudo-header: %.*s",
                    vmin_t(int, Tlen(hdr), 20), hdr.b);
                return (H2SE_PROTOCOL_ERROR);   // rfc7540,l,2990,2992
        }

        if (disallow_empty && Tlen(val) == 0) {
                VSLb(hp->vsl, SLT_BogoHeader,
                    "Empty pseudo-header %.*s",
                    (int)Tlen(nm), nm.b);
                return (H2SE_PROTOCOL_ERROR);
        }

        if (n >= HTTP_HDR_FIRST) {
                /* Check for space in struct http */
                if (n >= hp->shd) {
                        VSLb(hp->vsl, SLT_LostHeader,
                            "Too many headers: %.*s",
                            vmin_t(int, Tlen(hdr), 20), hdr.b);
                        return (H2SE_ENHANCE_YOUR_CALM);
                }
                hp->nhd++;
                AZ(hp->hd[n].b);
        }

        if (has_dup || hp->hd[n].b != NULL) {
                assert(nm.b[0] == ':');
                VSLb(hp->vsl, SLT_BogoHeader,
                    "Duplicate pseudo-header %.*s",
                    (int)Tlen(nm), nm.b);
                return (H2SE_PROTOCOL_ERROR);   // rfc7540,l,3158,3162
        }

        hp->hd[n] = hdr;
        return (0);
}

static void
h2h_decode_init(const struct h2_sess *h2, struct ws *ws)
{
        struct h2h_decode *d;

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(ws, WS_MAGIC);

        AN(h2->decode);
        d = h2->decode;
        INIT_OBJ(d, H2H_DECODE_MAGIC);
        VHD_Init(d->vhd);
        d->out_l = WS_ReserveSize(ws, cache_param->http_req_size);
        /*
         * Can't do any work without any buffer
         * space. Require non-zero size.
         */
        XXXAN(d->out_l);
        d->out = WS_Reservation(ws);

        if (cache_param->h2_max_header_list_size == 0)
                d->limit =
                    (long)(h2->local_settings.max_header_list_size * 1.5);
        else
                d->limit = cache_param->h2_max_header_list_size;

        if (d->limit < h2->local_settings.max_header_list_size)
                d->limit = INT64_MAX;

        d->ws = ws;
}

void
h2h_decode_hdr_init(const struct h2_sess *h2)
{

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(h2->new_req, REQ_MAGIC);
        CHECK_OBJ_NOTNULL(h2->new_req->http, HTTP_MAGIC);
        h2h_decode_init(h2, h2->new_req->ws);
}

/* Possible error returns:
 *
 * H2E_COMPRESSION_ERROR: Lost compression state due to incomplete header
 * block. This is a connection level error.
 *
 * H2E_ENHANCE_YOUR_CALM: Ran out of workspace or http header space. This
 * is a stream level error.
 */
h2_error
h2h_decode_hdr_fini(const struct h2_sess *h2)
{
        h2_error ret;
        struct h2h_decode *d;

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        d = h2->decode;
        CHECK_OBJ_NOTNULL(h2->new_req, REQ_MAGIC);
        CHECK_OBJ_NOTNULL(d, H2H_DECODE_MAGIC);
        WS_ReleaseP(d->ws, d->out);
        if (d->vhd_ret != VHD_OK) {
                /* HPACK header block didn't finish at an instruction
                   boundary */
                VSLb(h2->new_req->http->vsl, SLT_BogoHeader,
                    "HPACK compression error/fini (%s)", VHD_Error(d->vhd_ret));
                ret = H2CE_COMPRESSION_ERROR;
        } else if (d->error == NULL && !d->has_scheme) {
                H2S_Lock_VSLb(h2, SLT_Debug, "Missing :scheme");
                ret = H2SE_MISSING_SCHEME; //rfc7540,l,3087,3090
        } else
                ret = d->error;
        FINI_OBJ(d);
        if (ret == H2SE_REQ_SIZE) {
                VSLb(h2->new_req->http->vsl, SLT_LostHeader,
                    "Header list too large");
        }
        return (ret);
}

/* Possible error returns:
 *
 * H2E_COMPRESSION_ERROR: Lost compression state due to invalid header
 * block. This is a connection level error.
 *
 * H2E_PROTOCOL_ERROR: Malformed header or duplicate pseudo-header.
 *                     Violation of field name/value charsets
 */
h2_error
h2h_decode_bytes(struct h2_sess *h2, const uint8_t *in, size_t in_l)
{
        struct http *hp;
        struct h2h_decode *d;
        size_t in_u = 0;
        const char *r, *e;

        CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
        CHECK_OBJ_NOTNULL(h2->new_req, REQ_MAGIC);
        hp = h2->new_req->http;
        CHECK_OBJ_NOTNULL(hp, HTTP_MAGIC);
        d = h2->decode;
        CHECK_OBJ_NOTNULL(d, H2H_DECODE_MAGIC);
        CHECK_OBJ_NOTNULL(d->ws, WS_MAGIC);
        r = WS_Reservation(d->ws);
        AN(r);
        e = r + WS_ReservationSize(d->ws);

        /* Only H2E_ENHANCE_YOUR_CALM indicates that we should continue
           processing. Other errors should have been returned and handled
           by the caller. */
        if (d->error != NULL)
                assert(H2_ERROR_MATCH(d->error, H2SE_ENHANCE_YOUR_CALM));

        while (d->limit >= 0) {
                AN(d->out);
                assert(d->out_u <= d->out_l);
                d->vhd_ret = VHD_Decode(d->vhd, h2->dectbl, in, in_l, &in_u,
                    d->out, d->out_l, &d->out_u);

                if (d->vhd_ret < 0) {
                        H2S_Lock_VSLb(h2, SLT_BogoHeader,
                            "HPACK compression error (%s)",
                            VHD_Error(d->vhd_ret));
                        d->error = H2CE_COMPRESSION_ERROR;
                        break;
                } else if (d->vhd_ret == VHD_OK || d->vhd_ret == VHD_MORE) {
                        assert(in_u == in_l);
                        break;
                }

                if (H2_ERROR_MATCH(d->error, H2SE_ENHANCE_YOUR_CALM)) {
                        d->limit -= d->out_u;
                        d->out_u = 0;
                        assert(d->out_u < d->out_l);
                        continue;
                }

                switch (d->vhd_ret) {
                case VHD_NAME_SEC:
                        /* XXX: header flag for never-indexed header */
                case VHD_NAME:
                        assert(d->namelen == 0);
                        if (d->out_l - d->out_u < 2) {
                                d->error = H2SE_REQ_SIZE;
                                break;
                        }
                        d->out[d->out_u++] = ':';
                        d->out[d->out_u++] = ' ';
                        d->namelen = d->out_u;
                        break;

                case VHD_VALUE_SEC:
                        /* XXX: header flag for never-indexed header */
                case VHD_VALUE:
                        assert(d->namelen > 0);
                        if (d->out_l - d->out_u < 1) {
                                d->error = H2SE_REQ_SIZE;
                                break;
                        }
                        d->error = h2h_addhdr(hp, d);
                        if (d->error)
                                break;
                        d->out[d->out_u++] = '\0'; /* Zero guard */
                        d->out += d->out_u;
                        d->out_l -= d->out_u;
                        d->limit -= d->out_u;
                        d->out_u = 0;
                        d->namelen = 0;
                        break;

                case VHD_BUF:
                        d->error = H2SE_REQ_SIZE;
                        break;

                default:
                        WRONG("Unhandled return value");
                        break;
                }

                if (H2_ERROR_MATCH(d->error, H2SE_ENHANCE_YOUR_CALM)) {
                        d->out = WS_Reservation(d->ws);
                        d->out_l = e - d->out;
                        d->limit -= d->out_u;
                        d->out_u = 0;
                        assert(d->out_l > 0);
                } else if (d->error)
                        break;
        }

        if (d->limit < 0) {
                /* Fatal error, the client exceeded both http_req_size
                 * and h2_max_header_list_size. */
                H2S_Lock_VSLb(h2, SLT_SessError, "Header list too large");
                return (H2CE_ENHANCE_YOUR_CALM);
        }

        if (H2_ERROR_MATCH(d->error, H2SE_ENHANCE_YOUR_CALM)) {
                /* Stream error, delay reporting until h2h_decode_hdr_fini so
                 * that we can process the complete header block. */
                return (NULL);
        }

        return (d->error);
}

		varnish-cache/bin/varnishd/http2/cache_http2_hpack.c
0		/*-
1		* Copyright (c) 2016 Varnish Software AS
2		* All rights reserved.
3		*
4		* Author: Martin Blix Grydeland <martin@varnish-software.com>
5		*
6		* SPDX-License-Identifier: BSD-2-Clause
7		*
8		* Redistribution and use in source and binary forms, with or without
9		* modification, are permitted provided that the following conditions
10		* are met:
11		* 1. Redistributions of source code must retain the above copyright
12		* notice, this list of conditions and the following disclaimer.
13		* 2. Redistributions in binary form must reproduce the above copyright
14		* notice, this list of conditions and the following disclaimer in the
15		* documentation and/or other materials provided with the distribution.
16		*
17		* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
18		* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19		* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20		* ARE DISCLAIMED. IN NO EVENT SHALL AUTHOR OR CONTRIBUTORS BE LIABLE
21		* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22		* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23		* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24		* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25		* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26		* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
27		* SUCH DAMAGE.
28		*
29		*/
30
31		#include "config.h"
32
33		#include "cache/cache_varnishd.h"
34
35		#include <ctype.h>
36		#include <stdio.h>
37
38		#include "http2/cache_http2.h"
39		#include "vct.h"
40
41		static void
42	24240	h2h_assert_ready(const struct h2h_decode *d)
43		{
44
45	24240	CHECK_OBJ_NOTNULL(d, H2H_DECODE_MAGIC);
46	24240	AN(d->out);
47	24240	assert(d->namelen >= 2); /* 2 chars from the ": " that we added */
48	24240	assert(d->namelen <= d->out_u);
49	24240	assert(d->out[d->namelen - 2] == ':');
50	24240	assert(d->out[d->namelen - 1] == ' ');
51	24240	}
52
53		// rfc9113,l,2493,2528
54		static h2_error
55	24240	h2h_checkhdr(struct vsl_log *vsl, txt nm, txt val)
56		{
57		const char *p;
58		int l;
59		enum {
60		FLD_NAME_FIRST,
61		FLD_NAME,
62		FLD_VALUE_FIRST,
63		FLD_VALUE
64		} state;
65
66	24240	if (Tlen(nm) == 0) {
67	0	VSLb(vsl, SLT_BogoHeader, "Empty name");
68	0	return (H2SE_PROTOCOL_ERROR);
69		}
70
71		// VSLb(vsl, SLT_Debug, "CHDR [%.s] [%.s]",
72		// (int)Tlen(nm), nm.b, (int)Tlen(val), val.b);
73
74	24240	l = vmin_t(int, Tlen(nm) + 2 + Tlen(val), 20);
75	24240	state = FLD_NAME_FIRST;
76	183280	Tforeach(p, nm) {
77	159200	switch(state) {
78		case FLD_NAME_FIRST:
79	24240	state = FLD_NAME;
80	24240	if (*p == ':')
81	19440	break;
82		/* FALLTHROUGH */
83		case FLD_NAME:
84	139760	if (isupper(*p)) {
85	80	VSLb(vsl, SLT_BogoHeader,
86		"Illegal field header name (upper-case): %.*s",
87	40	l, nm.b);
88	40	return (H2SE_PROTOCOL_ERROR);
89		}
90	139720	if (!vct_istchar(p) \|\| p == ':') {
91	240	VSLb(vsl, SLT_BogoHeader,
92		"Illegal field header name (non-token): %.*s",
93	120	l, nm.b);
94	120	return (H2SE_PROTOCOL_ERROR);
95		}
96	139600	break;
97		default:
98	0	WRONG("http2 field name validation state");
99	0	}
100	159040	}
101
102	24080	state = FLD_VALUE_FIRST;
103	1280640	Tforeach(p, val) {
104	1256960	switch(state) {
105		case FLD_VALUE_FIRST:
106	23800	if (vct_issp(*p)) {
107	720	VSLb(vsl, SLT_BogoHeader,
108		"Illegal field value 0x%02x start %.*s",
109	360	*p, l, nm.b);
110	360	return (H2SE_PROTOCOL_ERROR);
111		}
112	23440	state = FLD_VALUE;
113		/* FALLTHROUGH */
114		case FLD_VALUE:
115	1256600	if (!vct_ishdrval(*p)) {
116	80	VSLb(vsl, SLT_BogoHeader,
117		"Illegal field value 0x%02x %.*s",
118	40	*p, l, nm.b);
119	40	return (H2SE_PROTOCOL_ERROR);
120		}
121	1256560	break;
122		default:
123	0	WRONG("http2 field value validation state");
124	0	}
125	1256560	}
126	23680	if (state == FLD_VALUE && vct_issp(val.e[-1])) {
127	160	VSLb(vsl, SLT_BogoHeader,
128		"Illegal field value 0x%02x (end) at %.*s",
129	80	val.e[-1], l, nm.b);
130	80	return (H2SE_PROTOCOL_ERROR);
131		}
132	23600	return (0);
133	24240	}
134
135		static h2_error
136	24240	h2h_addhdr(struct http hp, struct h2h_decode d)
137		{
138		/* XXX: This might belong in cache/cache_http.c */
139		txt hdr, nm, val;
140		int disallow_empty;
141		const char *p;
142		unsigned n, has_dup;
143		h2_error err;
144
145	24240	CHECK_OBJ_NOTNULL(hp, HTTP_MAGIC);
146	24240	h2h_assert_ready(d);
147
148		/* Assume hdr is by default a regular header from what we decoded. */
149	24240	hdr.b = d->out;
150	24240	hdr.e = hdr.b + d->out_u;
151	24240	n = hp->nhd;
152
153		/* nm and val are separated by ": " */
154	24240	nm.b = hdr.b;
155	24240	nm.e = nm.b + d->namelen - 2;
156	24240	val.b = nm.e + 2;
157	24240	val.e = hdr.e;
158
159	24240	err = h2h_checkhdr(hp->vsl, nm, val);
160	24240	if (err != NULL)
161	640	return (err);
162
163	23600	disallow_empty = 0;
164	23600	has_dup = 0;
165
166	23600	if (Tlen(hdr) > cache_param->http_req_hdr_len) {
167	40	VSLb(hp->vsl, SLT_BogoHeader, "Header too large: %.20s", hdr.b);
168	40	return (H2SE_ENHANCE_YOUR_CALM);
169		}
170
171		/* Match H/2 pseudo headers */
172		/* XXX: Should probably have some include tbl for pseudo-headers */
173	23560	if (!Tstrcmp(nm, ":method")) {
174	6040	hdr.b = val.b;
175	6040	n = HTTP_HDR_METHOD;
176	6040	disallow_empty = 1;
177
178		/* Check HTTP token */
179	25360	Tforeach(p, hdr) {
180	19320	if (!vct_istchar(*p))
181	0	return (H2SE_PROTOCOL_ERROR);
182	19320	}
183	23560	} else if (!Tstrcmp(nm, ":path")) {
184	6280	hdr.b = val.b;
185	6280	n = HTTP_HDR_URL;
186	6280	disallow_empty = 1;
187
188		// rfc9113,l,2693,2705
189	6280	if (Tlen(val) > 0 && val.b[0] != '/' && Tstrcmp(val, "*")) {
190	160	VSLb(hp->vsl, SLT_BogoHeader,
191		"Illegal :path pseudo-header %.*s",
192	80	(int)Tlen(val), val.b);
193	80	return (H2SE_PROTOCOL_ERROR);
194		}
195
196		/* Path cannot contain LWS or CTL */
197	19680	Tforeach(p, hdr) {
198	13480	if (vct_islws(p) \|\| vct_isctl(p))
199	0	return (H2SE_PROTOCOL_ERROR);
200	13480	}
201	17440	} else if (!Tstrcmp(nm, ":scheme")) {
202		/* XXX: What to do about this one? (typically
203		"http" or "https"). For now set it as a normal
204		header, stripping the first ':'. */
205	6080	hdr.b++;
206	6080	has_dup = d->has_scheme;
207	6080	d->has_scheme = 1;
208	6080	disallow_empty = 1;
209
210		/* Check HTTP token */
211	30120	Tforeach(p, val) {
212	24040	if (!vct_istchar(*p))
213	0	return (H2SE_PROTOCOL_ERROR);
214	24040	}
215	11240	} else if (!Tstrcmp(nm, ":authority")) {
216		/* NB: we inject "host" in place of "rity" for
217		* the ":authority" pseudo-header.
218		*/
219	680	memcpy(d->out + 6, "host", 4);
220	680	hdr.b += 6;
221	680	nm = Tstr(":authority"); /* preserve original */
222	680	has_dup = d->has_authority;
223	680	d->has_authority = 1;
224	5160	} else if (nm.b[0] == ':') {
225	160	VSLb(hp->vsl, SLT_BogoHeader,
226		"Unknown pseudo-header: %.*s",
227	80	vmin_t(int, Tlen(hdr), 20), hdr.b);
228	80	return (H2SE_PROTOCOL_ERROR); // rfc7540,l,2990,2992
229		}
230
231	23400	if (disallow_empty && Tlen(val) == 0) {
232	480	VSLb(hp->vsl, SLT_BogoHeader,
233		"Empty pseudo-header %.*s",
234	240	(int)Tlen(nm), nm.b);
235	240	return (H2SE_PROTOCOL_ERROR);
236		}
237
238	23160	if (n >= HTTP_HDR_FIRST) {
239		/* Check for space in struct http */
240	11080	if (n >= hp->shd) {
241	80	VSLb(hp->vsl, SLT_LostHeader,
242		"Too many headers: %.*s",
243	40	vmin_t(int, Tlen(hdr), 20), hdr.b);
244	40	return (H2SE_ENHANCE_YOUR_CALM);
245		}
246	11040	hp->nhd++;
247	11040	AZ(hp->hd[n].b);
248	11040	}
249
250	23120	if (has_dup \|\| hp->hd[n].b != NULL) {
251	200	assert(nm.b[0] == ':');
252	400	VSLb(hp->vsl, SLT_BogoHeader,
253		"Duplicate pseudo-header %.*s",
254	200	(int)Tlen(nm), nm.b);
255	200	return (H2SE_PROTOCOL_ERROR); // rfc7540,l,3158,3162
256		}
257
258	22920	hp->hd[n] = hdr;
259	22920	return (0);
260	24240	}
261
262		static void
263	7440	h2h_decode_init(const struct h2_sess h2, struct ws ws)
264		{
265		struct h2h_decode *d;
266
267	7440	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
268	7440	CHECK_OBJ_NOTNULL(ws, WS_MAGIC);
269
270	7440	AN(h2->decode);
271	7440	d = h2->decode;
272	7440	INIT_OBJ(d, H2H_DECODE_MAGIC);
273	7440	VHD_Init(d->vhd);
274	7440	d->out_l = WS_ReserveSize(ws, cache_param->http_req_size);
275		/*
276		* Can't do any work without any buffer
277		* space. Require non-zero size.
278		*/
279	7440	XXXAN(d->out_l);
280	7440	d->out = WS_Reservation(ws);
281
282	7440	if (cache_param->h2_max_header_list_size == 0)
283	7440	d->limit =
284	7440	(long)(h2->local_settings.max_header_list_size * 1.5);
285		else
286	0	d->limit = cache_param->h2_max_header_list_size;
287
288	7440	if (d->limit < h2->local_settings.max_header_list_size)
289	0	d->limit = INT64_MAX;
290
291	7440	d->ws = ws;
292	7440	}
293
294		void
295	7440	h2h_decode_hdr_init(const struct h2_sess *h2)
296		{
297
298	7440	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
299	7440	CHECK_OBJ_NOTNULL(h2->new_req, REQ_MAGIC);
300	7440	CHECK_OBJ_NOTNULL(h2->new_req->http, HTTP_MAGIC);
301	7440	h2h_decode_init(h2, h2->new_req->ws);
302	7440	}
303
304		/* Possible error returns:
305		*
306		* H2E_COMPRESSION_ERROR: Lost compression state due to incomplete header
307		* block. This is a connection level error.
308		*
309		* H2E_ENHANCE_YOUR_CALM: Ran out of workspace or http header space. This
310		* is a stream level error.
311		*/
312		h2_error
313	7440	h2h_decode_hdr_fini(const struct h2_sess *h2)
314		{
315		h2_error ret;
316		struct h2h_decode *d;
317
318	7440	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
319	7440	d = h2->decode;
320	7440	CHECK_OBJ_NOTNULL(h2->new_req, REQ_MAGIC);
321	7440	CHECK_OBJ_NOTNULL(d, H2H_DECODE_MAGIC);
322	7440	WS_ReleaseP(d->ws, d->out);
323	7440	if (d->vhd_ret != VHD_OK) {
324		/* HPACK header block didn't finish at an instruction
325		boundary */
326	2800	VSLb(h2->new_req->http->vsl, SLT_BogoHeader,
327	1400	"HPACK compression error/fini (%s)", VHD_Error(d->vhd_ret));
328	1400	ret = H2CE_COMPRESSION_ERROR;
329	7440	} else if (d->error == NULL && !d->has_scheme) {
330	160	H2S_Lock_VSLb(h2, SLT_Debug, "Missing :scheme");
331	160	ret = H2SE_MISSING_SCHEME; //rfc7540,l,3087,3090
332	160	} else
333	5880	ret = d->error;
334	7440	FINI_OBJ(d);
335	7440	if (ret == H2SE_REQ_SIZE) {
336	40	VSLb(h2->new_req->http->vsl, SLT_LostHeader,
337		"Header list too large");
338	40	}
339	7440	return (ret);
340		}
341
342		/* Possible error returns:
343		*
344		* H2E_COMPRESSION_ERROR: Lost compression state due to invalid header
345		* block. This is a connection level error.
346		*
347		* H2E_PROTOCOL_ERROR: Malformed header or duplicate pseudo-header.
348		* Violation of field name/value charsets
349		*/
350		h2_error
351	8000	h2h_decode_bytes(struct h2_sess h2, const uint8_t in, size_t in_l)
352		{
353		struct http *hp;
354		struct h2h_decode *d;
355	8000	size_t in_u = 0;
356		const char r, e;
357
358	8000	CHECK_OBJ_NOTNULL(h2, H2_SESS_MAGIC);
359	8000	CHECK_OBJ_NOTNULL(h2->new_req, REQ_MAGIC);
360	8000	hp = h2->new_req->http;
361	8000	CHECK_OBJ_NOTNULL(hp, HTTP_MAGIC);
362	8000	d = h2->decode;
363	8000	CHECK_OBJ_NOTNULL(d, H2H_DECODE_MAGIC);
364	8000	CHECK_OBJ_NOTNULL(d->ws, WS_MAGIC);
365	8000	r = WS_Reservation(d->ws);
366	8000	AN(r);
367	8000	e = r + WS_ReservationSize(d->ws);
368
369		/* Only H2E_ENHANCE_YOUR_CALM indicates that we should continue
370		processing. Other errors should have been returned and handled
371		by the caller. */
372	8000	if (d->error != NULL)
373	160	assert(H2_ERROR_MATCH(d->error, H2SE_ENHANCE_YOUR_CALM));
374
375	56440	while (d->limit >= 0) {
376	56400	AN(d->out);
377	56400	assert(d->out_u <= d->out_l);
378	112800	d->vhd_ret = VHD_Decode(d->vhd, h2->dectbl, in, in_l, &in_u,
379	56400	d->out, d->out_l, &d->out_u);
380
381	56400	if (d->vhd_ret < 0) {
382	160	H2S_Lock_VSLb(h2, SLT_BogoHeader,
383		"HPACK compression error (%s)",
384	80	VHD_Error(d->vhd_ret));
385	80	d->error = H2CE_COMPRESSION_ERROR;
386	80	break;
387	56320	} else if (d->vhd_ret == VHD_OK \|\| d->vhd_ret == VHD_MORE) {
388	6640	assert(in_u == in_l);
389	6640	break;
390		}
391
392	49680	if (H2_ERROR_MATCH(d->error, H2SE_ENHANCE_YOUR_CALM)) {
393	1040	d->limit -= d->out_u;
394	1040	d->out_u = 0;
395	1040	assert(d->out_u < d->out_l);
396	1040	continue;
397		}
398
399	48640	switch (d->vhd_ret) {
400		case VHD_NAME_SEC:
401		/* XXX: header flag for never-indexed header */
402		case VHD_NAME:
403	24360	assert(d->namelen == 0);
404	24360	if (d->out_l - d->out_u < 2) {
405	40	d->error = H2SE_REQ_SIZE;
406	40	break;
407		}
408	24320	d->out[d->out_u++] = ':';
409	24320	d->out[d->out_u++] = ' ';
410	24320	d->namelen = d->out_u;
411	24320	break;
412
413		case VHD_VALUE_SEC:
414		/* XXX: header flag for never-indexed header */
415		case VHD_VALUE:
416	24240	assert(d->namelen > 0);
417	24240	if (d->out_l - d->out_u < 1) {
418	0	d->error = H2SE_REQ_SIZE;
419	0	break;
420		}
421	24240	d->error = h2h_addhdr(hp, d);
422	24240	if (d->error)
423	1320	break;
424	22920	d->out[d->out_u++] = '\0'; /* Zero guard */
425	22920	d->out += d->out_u;
426	22920	d->out_l -= d->out_u;
427	22920	d->limit -= d->out_u;
428	22920	d->out_u = 0;
429	22920	d->namelen = 0;
430	22920	break;
431
432		case VHD_BUF:
433	40	d->error = H2SE_REQ_SIZE;
434	40	break;
435
436		default:
437	0	WRONG("Unhandled return value");
438	0	break;
439		}
440
441	48640	if (H2_ERROR_MATCH(d->error, H2SE_ENHANCE_YOUR_CALM)) {
442	160	d->out = WS_Reservation(d->ws);
443	160	d->out_l = e - d->out;
444	160	d->limit -= d->out_u;
445	160	d->out_u = 0;
446	160	assert(d->out_l > 0);
447	48640	} else if (d->error)
448	1240	break;
449		}
450
451	8000	if (d->limit < 0) {
452		/* Fatal error, the client exceeded both http_req_size
453		* and h2_max_header_list_size. */
454	40	H2S_Lock_VSLb(h2, SLT_SessError, "Header list too large");
455	40	return (H2CE_ENHANCE_YOUR_CALM);
456		}
457
458	7960	if (H2_ERROR_MATCH(d->error, H2SE_ENHANCE_YOUR_CALM)) {
459		/* Stream error, delay reporting until h2h_decode_hdr_fini so
460		* that we can process the complete header block. */
461	280	return (NULL);
462		}
463
464	7680	return (d->error);
465	8000	}