mirror of
https://github.com/omar-polo/gmid.git
synced 2024-08-17 16:33:28 +02:00
1550 lines
32 KiB
C
1550 lines
32 KiB
C
/*
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* Copyright (c) 2021, 2022, 2023 Omar Polo <op@omarpolo.com>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include "gmid.h"
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#include <sys/stat.h>
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#include <sys/un.h>
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#include <assert.h>
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#include <ctype.h>
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#include <errno.h>
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#include <event.h>
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#include <fcntl.h>
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#include <fnmatch.h>
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#include <limits.h>
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#include <string.h>
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#include "log.h"
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#include "proc.h"
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#define MIN(a, b) ((a) < (b) ? (a) : (b))
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#ifndef nitems
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#define nitems(_a) (sizeof((_a)) / sizeof((_a)[0]))
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#endif
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#ifdef SIGINFO
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static struct event siginfo;
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#endif
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static struct event sigusr2;
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int connected_clients;
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/*
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* This function is not publicy exported because it is a hack until libtls
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* has a proper privsep setup.
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*/
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void tls_config_use_fake_private_key(struct tls_config *);
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static inline int matches(const char*, const char*);
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static void handle_handshake(int, short, void*);
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static const char *strip_path(const char*, int);
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static void fmtbuf(char *, size_t, const char *, struct client *,
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const char *);
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static int apply_block_return(struct client*);
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static int check_matching_certificate(X509_STORE *, struct client *);
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static int apply_reverse_proxy(struct client *);
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static int apply_fastcgi(struct client*);
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static int apply_require_ca(struct client*);
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static void open_dir(struct client*);
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static void redirect_canonical_dir(struct client*);
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static void client_tls_readcb(int, short, void *);
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static void client_tls_writecb(int, short, void *);
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static void client_read(struct bufferevent *, void *);
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void client_write(struct bufferevent *, void *);
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static void client_error(struct bufferevent *, short, void *);
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static void client_close_ev(int, short, void *);
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static void handle_siginfo(int, short, void*);
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static int server_dispatch_parent(int, struct privsep_proc *, struct imsg *);
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static int server_dispatch_crypto(int, struct privsep_proc *, struct imsg *);
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static int server_dispatch_logger(int, struct privsep_proc *, struct imsg *);
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static struct privsep_proc procs[] = {
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{ "parent", PROC_PARENT, server_dispatch_parent },
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{ "crypto", PROC_CRYPTO, server_dispatch_crypto },
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{ "logger", PROC_LOGGER, server_dispatch_logger },
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};
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static uint32_t server_client_id;
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struct client_tree_id clients;
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static inline int
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match_addr(struct address *target, struct address *source)
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{
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return (target->ai_flags == source->ai_flags &&
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target->ai_family == source->ai_family &&
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target->ai_socktype == source->ai_socktype &&
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target->ai_protocol == source->ai_protocol &&
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target->slen == source->slen &&
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!memcmp(&target->ss, &source->ss, target->slen));
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}
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static inline int
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matches(const char *pattern, const char *path)
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{
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if (*path == '/')
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path++;
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return !fnmatch(pattern, path, 0);
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}
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static inline int
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match_host(struct vhost *v, struct client *c)
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{
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struct alist *a;
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struct address *addr;
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TAILQ_FOREACH(addr, &v->addrs, addrs)
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if (match_addr(addr, c->addr))
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break;
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if (addr == NULL)
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return 0;
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if (matches(v->domain, c->domain))
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return 1;
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TAILQ_FOREACH(a, &v->aliases, aliases)
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if (matches(a->alias, c->domain))
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return 1;
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return 0;
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}
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const char *
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vhost_lang(struct vhost *v, const char *path)
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{
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struct location *loc;
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if (v == NULL || path == NULL)
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return NULL;
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loc = TAILQ_FIRST(&v->locations);
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while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
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if (*loc->lang != '\0') {
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if (matches(loc->match, path))
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return loc->lang;
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}
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}
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loc = TAILQ_FIRST(&v->locations);
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if (*loc->lang == '\0')
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return NULL;
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return loc->lang;
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}
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const char *
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vhost_default_mime(struct vhost *v, const char *path)
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{
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struct location *loc;
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const char *default_mime = "application/octet-stream";
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if (v == NULL || path == NULL)
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return default_mime;
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loc = TAILQ_FIRST(&v->locations);
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while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
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if (*loc->default_mime != '\0') {
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if (matches(loc->match, path))
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return loc->default_mime;
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}
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}
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loc = TAILQ_FIRST(&v->locations);
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if (*loc->default_mime != '\0')
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return loc->default_mime;
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return default_mime;
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}
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const char *
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vhost_index(struct vhost *v, const char *path)
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{
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struct location *loc;
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const char *index = "index.gmi";
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if (v == NULL || path == NULL)
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return index;
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loc = TAILQ_FIRST(&v->locations);
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while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
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if (*loc->index != '\0') {
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if (matches(loc->match, path))
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return loc->index;
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}
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}
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loc = TAILQ_FIRST(&v->locations);
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if (*loc->index != '\0')
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return loc->index;
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return index;
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}
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int
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vhost_auto_index(struct vhost *v, const char *path)
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{
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struct location *loc;
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if (v == NULL || path == NULL)
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return 0;
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loc = TAILQ_FIRST(&v->locations);
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while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
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if (loc->auto_index != 0) {
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if (matches(loc->match, path))
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return loc->auto_index == 1;
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}
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}
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loc = TAILQ_FIRST(&v->locations);
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return loc->auto_index == 1;
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}
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int
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vhost_block_return(struct vhost *v, const char *path, int *code, const char **fmt)
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{
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struct location *loc;
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if (v == NULL || path == NULL)
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return 0;
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loc = TAILQ_FIRST(&v->locations);
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while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
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if (loc->block_code != 0) {
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if (matches(loc->match, path)) {
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*code = loc->block_code;
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*fmt = loc->block_fmt;
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return 1;
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}
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}
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}
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loc = TAILQ_FIRST(&v->locations);
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*code = loc->block_code;
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*fmt = loc->block_fmt;
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return loc->block_code != 0;
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}
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int
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vhost_fastcgi(struct vhost *v, const char *path)
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{
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struct location *loc;
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if (v == NULL || path == NULL)
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return -1;
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loc = TAILQ_FIRST(&v->locations);
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while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
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if (loc->fcgi != -1)
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if (matches(loc->match, path))
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return loc->fcgi;
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}
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loc = TAILQ_FIRST(&v->locations);
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return loc->fcgi;
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}
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int
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vhost_dirfd(struct vhost *v, const char *path, size_t *retloc)
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{
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struct location *loc;
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size_t l = 0;
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if (v == NULL || path == NULL)
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return -1;
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loc = TAILQ_FIRST(&v->locations);
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while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
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l++;
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if (loc->dirfd != -1)
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if (matches(loc->match, path)) {
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*retloc = l;
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return loc->dirfd;
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}
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}
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*retloc = 0;
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loc = TAILQ_FIRST(&v->locations);
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return loc->dirfd;
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}
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int
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vhost_strip(struct vhost *v, const char *path)
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{
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struct location *loc;
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if (v == NULL || path == NULL)
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return 0;
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loc = TAILQ_FIRST(&v->locations);
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while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
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if (loc->strip != 0) {
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if (matches(loc->match, path))
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return loc->strip;
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}
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}
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loc = TAILQ_FIRST(&v->locations);
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return loc->strip;
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}
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X509_STORE *
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vhost_require_ca(struct vhost *v, const char *path)
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{
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struct location *loc;
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if (v == NULL || path == NULL)
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return NULL;
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loc = TAILQ_FIRST(&v->locations);
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while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
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if (loc->reqca != NULL) {
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if (matches(loc->match, path))
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return loc->reqca;
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}
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}
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loc = TAILQ_FIRST(&v->locations);
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return loc->reqca;
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}
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int
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vhost_disable_log(struct vhost *v, const char *path)
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{
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struct location *loc;
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if (v == NULL || path == NULL)
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return 0;
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loc = TAILQ_FIRST(&v->locations);
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while ((loc = TAILQ_NEXT(loc, locations)) != NULL) {
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if (loc->disable_log && matches(loc->match, path))
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return 1;
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}
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loc = TAILQ_FIRST(&v->locations);
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return loc->disable_log;
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}
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void
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mark_nonblock(int fd)
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{
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int flags;
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if ((flags = fcntl(fd, F_GETFL)) == -1)
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fatal("fcntl(F_GETFL)");
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if (fcntl(fd, F_SETFL, flags | O_NONBLOCK) == -1)
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fatal("fcntl(F_SETFL)");
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}
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static void
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handle_handshake(int fd, short ev, void *d)
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{
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struct client *c = d;
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struct conf *conf = c->conf;
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struct vhost *h;
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const char *servname;
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const char *parse_err = "unknown error";
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switch (tls_handshake(c->ctx)) {
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case 0: /* success */
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break;
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case -1:
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log_warnx("tls_handshake failed: %s", tls_error(c->ctx));
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client_close(c);
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return;
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case TLS_WANT_POLLIN:
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event_once(c->fd, EV_READ, handle_handshake, c, NULL);
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return;
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case TLS_WANT_POLLOUT:
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event_once(c->fd, EV_WRITE, handle_handshake, c, NULL);
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return;
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default:
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/* unreachable */
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abort();
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}
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c->bev = bufferevent_new(fd, client_read, client_write,
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client_error, c);
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if (c->bev == NULL)
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fatal("%s: failed to allocate client buffer", __func__);
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event_set(&c->bev->ev_read, c->fd, EV_READ,
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client_tls_readcb, c->bev);
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event_set(&c->bev->ev_write, c->fd, EV_WRITE,
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client_tls_writecb, c->bev);
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#if HAVE_LIBEVENT2
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evbuffer_unfreeze(c->bev->input, 0);
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evbuffer_unfreeze(c->bev->output, 1);
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#endif
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if ((servname = tls_conn_servername(c->ctx)) == NULL) {
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log_debug("handshake: missing SNI");
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goto err;
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}
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if (!puny_decode(servname, c->domain, sizeof(c->domain), &parse_err)) {
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log_info("puny_decode: %s", parse_err);
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goto err;
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}
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TAILQ_FOREACH(h, &conf->hosts, vhosts)
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if (match_host(h, c))
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break;
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log_debug("handshake: SNI: \"%s\"; decoded: \"%s\"; matched: \"%s\"",
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servname != NULL ? servname : "(null)",
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c->domain,
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h != NULL ? h->domain : "(null)");
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if (h != NULL) {
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c->host = h;
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bufferevent_enable(c->bev, EV_READ);
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return;
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}
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err:
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start_reply(c, BAD_REQUEST, "Wrong/malformed host or missing SNI");
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}
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static const char *
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strip_path(const char *path, int strip)
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{
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char *t;
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while (strip > 0) {
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if ((t = strchr(path, '/')) == NULL) {
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path = strchr(path, '\0');
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break;
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}
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path = t;
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strip--;
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}
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return path;
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}
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|
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static void
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fmtbuf(char *buf, size_t buflen, const char *fmt, struct client *c,
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const char *path)
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{
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size_t i;
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char tmp[32];
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|
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*buf = '\0';
|
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memset(tmp, 0, sizeof(tmp));
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for (i = 0; *fmt; ++fmt) {
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if (i == sizeof(tmp)-1 || *fmt == '%') {
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strlcat(buf, tmp, buflen);
|
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memset(tmp, 0, sizeof(tmp));
|
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i = 0;
|
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}
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|
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if (*fmt != '%') {
|
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tmp[i++] = *fmt;
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continue;
|
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}
|
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|
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switch (*++fmt) {
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case '%':
|
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strlcat(buf, "%", buflen);
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break;
|
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case 'p':
|
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if (*path != '/')
|
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strlcat(buf, "/", buflen);
|
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strlcat(buf, path, buflen);
|
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break;
|
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case 'q':
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strlcat(buf, c->iri.query, buflen);
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break;
|
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case 'P':
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snprintf(tmp, sizeof(tmp), "%d", c->addr->port);
|
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strlcat(buf, tmp, buflen);
|
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memset(tmp, 0, sizeof(tmp));
|
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break;
|
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case 'N':
|
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strlcat(buf, c->domain, buflen);
|
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break;
|
|
default:
|
|
log_warnx("%s: unknown fmt specifier %c",
|
|
__func__, *fmt);
|
|
}
|
|
}
|
|
|
|
if (i != 0)
|
|
strlcat(buf, tmp, buflen);
|
|
}
|
|
|
|
/* 1 if a matching `block return' (and apply it), 0 otherwise */
|
|
static int
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apply_block_return(struct client *c)
|
|
{
|
|
char buf[GEMINI_URL_LEN];
|
|
const char *fmt, *path;
|
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int code;
|
|
|
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if (!vhost_block_return(c->host, c->iri.path, &code, &fmt))
|
|
return 0;
|
|
|
|
path = strip_path(c->iri.path, vhost_strip(c->host, c->iri.path));
|
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fmtbuf(buf, sizeof(buf), fmt, c, path);
|
|
|
|
start_reply(c, code, buf);
|
|
return 1;
|
|
}
|
|
|
|
static struct proxy *
|
|
matched_proxy(struct client *c)
|
|
{
|
|
struct proxy *p;
|
|
const char *proto;
|
|
const char *host;
|
|
const char *port;
|
|
|
|
TAILQ_FOREACH(p, &c->host->proxies, proxies) {
|
|
if (*(proto = p->match_proto) == '\0')
|
|
proto = "gemini";
|
|
if (*(host = p->match_host) == '\0')
|
|
host = "*";
|
|
if (*(port = p->match_port) == '\0')
|
|
port = "*";
|
|
|
|
if (matches(proto, c->iri.schema) &&
|
|
matches(host, c->domain) &&
|
|
matches(port, c->iri.port))
|
|
return p;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static int
|
|
check_matching_certificate(X509_STORE *store, struct client *c)
|
|
{
|
|
const uint8_t *cert;
|
|
size_t len;
|
|
|
|
if (!tls_peer_cert_provided(c->ctx)) {
|
|
start_reply(c, CLIENT_CERT_REQ, "client certificate required");
|
|
return 1;
|
|
}
|
|
|
|
cert = tls_peer_cert_chain_pem(c->ctx, &len);
|
|
if (!validate_against_ca(store, cert, len)) {
|
|
start_reply(c, CERT_NOT_AUTH, "certificate not authorised");
|
|
return 1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
proxy_socket(struct client *c, const char *host, const char *port)
|
|
{
|
|
struct addrinfo hints, *res, *res0;
|
|
int r, sock, save_errno;
|
|
const char *cause = NULL;
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = AF_UNSPEC;
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
|
|
/* XXX: asr_run? :> */
|
|
r = getaddrinfo(host, port, &hints, &res0);
|
|
if (r != 0) {
|
|
log_warnx("getaddrinfo(\"%s\", \"%s\"): %s",
|
|
host, port, gai_strerror(r));
|
|
return -1;
|
|
}
|
|
|
|
for (res = res0; res; res = res->ai_next) {
|
|
sock = socket(res->ai_family, res->ai_socktype,
|
|
res->ai_protocol);
|
|
if (sock == -1) {
|
|
cause = "socket";
|
|
continue;
|
|
}
|
|
|
|
if (connect(sock, res->ai_addr, res->ai_addrlen) == -1) {
|
|
cause = "connect";
|
|
save_errno = errno;
|
|
close(sock);
|
|
errno = save_errno;
|
|
sock = -1;
|
|
continue;
|
|
}
|
|
|
|
break;
|
|
}
|
|
|
|
if (sock == -1)
|
|
log_warn("can't connect to %s:%s: %s", host, port, cause);
|
|
|
|
freeaddrinfo(res0);
|
|
|
|
return sock;
|
|
}
|
|
|
|
/* 1 if matching a proxy relay-to (and apply it), 0 otherwise */
|
|
static int
|
|
apply_reverse_proxy(struct client *c)
|
|
{
|
|
struct proxy *p;
|
|
|
|
if ((p = matched_proxy(c)) == NULL)
|
|
return 0;
|
|
|
|
c->proxy = p;
|
|
|
|
if (p->reqca != NULL && check_matching_certificate(p->reqca, c))
|
|
return 1;
|
|
|
|
log_debug("opening proxy connection for %s:%s",
|
|
p->host, p->port);
|
|
|
|
if ((c->pfd = proxy_socket(c, p->host, p->port)) == -1) {
|
|
start_reply(c, PROXY_ERROR, "proxy error");
|
|
return 1;
|
|
}
|
|
|
|
mark_nonblock(c->pfd);
|
|
if (proxy_init(c) == -1)
|
|
start_reply(c, PROXY_ERROR, "proxy error");
|
|
|
|
return 1;
|
|
}
|
|
|
|
static int
|
|
fcgi_open_sock(struct fcgi *f)
|
|
{
|
|
struct sockaddr_un addr;
|
|
int fd;
|
|
|
|
if ((fd = socket(AF_UNIX, SOCK_STREAM, 0)) == -1) {
|
|
log_warn("socket");
|
|
return -1;
|
|
}
|
|
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.sun_family = AF_UNIX;
|
|
strlcpy(addr.sun_path, f->path, sizeof(addr.sun_path));
|
|
|
|
if (connect(fd, (struct sockaddr*)&addr, sizeof(addr)) == -1) {
|
|
log_warn("failed to connect to %s", f->path);
|
|
close(fd);
|
|
return -1;
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
static int
|
|
fcgi_open_conn(struct fcgi *f)
|
|
{
|
|
struct addrinfo hints, *servinfo, *p;
|
|
int r, sock, save_errno;
|
|
const char *cause = NULL;
|
|
|
|
memset(&hints, 0, sizeof(hints));
|
|
hints.ai_family = AF_UNSPEC;
|
|
hints.ai_socktype = SOCK_STREAM;
|
|
hints.ai_flags = AI_ADDRCONFIG;
|
|
|
|
if ((r = getaddrinfo(f->path, f->port, &hints, &servinfo)) != 0) {
|
|
log_warnx("getaddrinfo %s:%s: %s", f->path, f->port,
|
|
gai_strerror(r));
|
|
return -1;
|
|
}
|
|
|
|
for (p = servinfo; p != NULL; p = p->ai_next) {
|
|
sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol);
|
|
if (sock == -1) {
|
|
cause = "socket";
|
|
continue;
|
|
}
|
|
if (connect(sock, p->ai_addr, p->ai_addrlen) == -1) {
|
|
cause = "connect";
|
|
save_errno = errno;
|
|
close(sock);
|
|
errno = save_errno;
|
|
continue;
|
|
}
|
|
break;
|
|
}
|
|
|
|
if (p == NULL) {
|
|
log_warn("couldn't connect to %s:%s: %s", f->path, f->port,
|
|
cause);
|
|
sock = -1;
|
|
}
|
|
|
|
freeaddrinfo(servinfo);
|
|
return sock;
|
|
}
|
|
|
|
/* 1 if matching `fcgi' (and apply it), 0 otherwise */
|
|
static int
|
|
apply_fastcgi(struct client *c)
|
|
{
|
|
int id, i = 0;
|
|
struct fcgi *f;
|
|
|
|
if ((id = vhost_fastcgi(c->host, c->iri.path)) == -1)
|
|
return 0;
|
|
|
|
TAILQ_FOREACH(f, &c->conf->fcgi, fcgi) {
|
|
if (i == id)
|
|
break;
|
|
++i;
|
|
}
|
|
|
|
if (f == NULL) {
|
|
log_warnx("can't find fcgi #%d", id);
|
|
return 0;
|
|
}
|
|
|
|
log_debug("opening fastcgi connection for (%s,%s)",
|
|
f->path, f->port);
|
|
|
|
if (*f->port == '\0')
|
|
c->pfd = fcgi_open_sock(f);
|
|
else
|
|
c->pfd = fcgi_open_conn(f);
|
|
|
|
if (c->pfd == -1) {
|
|
start_reply(c, CGI_ERROR, "CGI error");
|
|
return 1;
|
|
}
|
|
|
|
mark_nonblock(c->pfd);
|
|
|
|
c->cgibev = bufferevent_new(c->pfd, fcgi_read, fcgi_write,
|
|
fcgi_error, c);
|
|
if (c->cgibev == NULL) {
|
|
start_reply(c, TEMP_FAILURE, "internal server error");
|
|
return 1;
|
|
}
|
|
|
|
bufferevent_enable(c->cgibev, EV_READ|EV_WRITE);
|
|
fcgi_req(c);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/* 1 if matching `require client ca' fails (and apply it), 0 otherwise */
|
|
static int
|
|
apply_require_ca(struct client *c)
|
|
{
|
|
X509_STORE *store;
|
|
|
|
if ((store = vhost_require_ca(c->host, c->iri.path)) == NULL)
|
|
return 0;
|
|
return check_matching_certificate(store, c);
|
|
}
|
|
|
|
static void
|
|
server_dir_listing(struct client *c)
|
|
{
|
|
int root;
|
|
|
|
root = !strcmp(c->iri.path, "/") || *c->iri.path == '\0';
|
|
|
|
if (!vhost_auto_index(c->host, c->iri.path)) {
|
|
start_reply(c, NOT_FOUND, "not found");
|
|
return;
|
|
}
|
|
|
|
c->dirlen = scandir_fd(c->pfd, &c->dir,
|
|
root ? select_non_dotdot : select_non_dot,
|
|
alphasort);
|
|
if (c->dirlen == -1) {
|
|
log_warn("scandir_fd(%d) (vhost:%s) %s",
|
|
c->pfd, c->host->domain, c->iri.path);
|
|
start_reply(c, TEMP_FAILURE, "internal server error");
|
|
return;
|
|
}
|
|
|
|
c->type = REQUEST_DIR;
|
|
start_reply(c, SUCCESS, "text/gemini");
|
|
evbuffer_add_printf(EVBUFFER_OUTPUT(c->bev),
|
|
"# Index of /%s\n\n", c->iri.path);
|
|
}
|
|
|
|
static void
|
|
open_dir(struct client *c)
|
|
{
|
|
struct stat sb;
|
|
const char *index;
|
|
char path[PATH_MAX];
|
|
int fd = -1;
|
|
|
|
if (*c->iri.path != '\0' && !ends_with(c->iri.path, "/")) {
|
|
redirect_canonical_dir(c);
|
|
return;
|
|
}
|
|
|
|
index = vhost_index(c->host, c->iri.path);
|
|
fd = openat(c->pfd, index, O_RDONLY);
|
|
if (fd == -1) {
|
|
server_dir_listing(c);
|
|
return;
|
|
}
|
|
|
|
if (fstat(fd, &sb) == -1) {
|
|
log_warn("fstat");
|
|
close(fd);
|
|
start_reply(c, TEMP_FAILURE, "internal server error");
|
|
return;
|
|
}
|
|
|
|
if (!S_ISREG(sb.st_mode)) {
|
|
close(fd);
|
|
server_dir_listing(c);
|
|
return;
|
|
}
|
|
|
|
strlcpy(path, c->iri.path, sizeof(path));
|
|
strlcat(path, index, sizeof(path));
|
|
|
|
close(c->pfd);
|
|
c->pfd = fd;
|
|
c->type = REQUEST_FILE;
|
|
start_reply(c, SUCCESS, mime(c->conf, c->host, path));
|
|
}
|
|
|
|
static void
|
|
redirect_canonical_dir(struct client *c)
|
|
{
|
|
char buf[GEMINI_URL_LEN];
|
|
int r;
|
|
|
|
r = snprintf(buf, sizeof(buf), "/%s/", c->iri.path);
|
|
if (r < 0 || (size_t)r >= sizeof(buf)) {
|
|
start_reply(c, TEMP_FAILURE, "internal server error");
|
|
return;
|
|
}
|
|
|
|
start_reply(c, TEMP_REDIRECT, buf);
|
|
}
|
|
|
|
static void
|
|
client_tls_readcb(int fd, short event, void *d)
|
|
{
|
|
struct bufferevent *bufev = d;
|
|
struct client *client = bufev->cbarg;
|
|
ssize_t ret;
|
|
size_t len;
|
|
int what = EVBUFFER_READ;
|
|
int howmuch = IBUF_READ_SIZE;
|
|
char buf[IBUF_READ_SIZE];
|
|
|
|
if (event == EV_TIMEOUT) {
|
|
what |= EVBUFFER_TIMEOUT;
|
|
goto err;
|
|
}
|
|
|
|
if (bufev->wm_read.high != 0)
|
|
howmuch = MIN(sizeof(buf), bufev->wm_read.high);
|
|
|
|
switch (ret = tls_read(client->ctx, buf, howmuch)) {
|
|
case TLS_WANT_POLLIN:
|
|
case TLS_WANT_POLLOUT:
|
|
goto retry;
|
|
case -1:
|
|
what |= EVBUFFER_ERROR;
|
|
goto err;
|
|
}
|
|
len = ret;
|
|
|
|
if (len == 0) {
|
|
what |= EVBUFFER_EOF;
|
|
goto err;
|
|
}
|
|
|
|
if (evbuffer_add(bufev->input, buf, len) == -1) {
|
|
what |= EVBUFFER_ERROR;
|
|
goto err;
|
|
}
|
|
|
|
event_add(&bufev->ev_read, NULL);
|
|
if (bufev->wm_read.low != 0 && len < bufev->wm_read.low)
|
|
return;
|
|
if (bufev->wm_read.high != 0 && len > bufev->wm_read.high) {
|
|
/*
|
|
* here we could implement a read pressure policy.
|
|
*/
|
|
}
|
|
|
|
if (bufev->readcb != NULL)
|
|
(*bufev->readcb)(bufev, bufev->cbarg);
|
|
|
|
return;
|
|
|
|
retry:
|
|
event_add(&bufev->ev_read, NULL);
|
|
return;
|
|
|
|
err:
|
|
(*bufev->errorcb)(bufev, what, bufev->cbarg);
|
|
}
|
|
|
|
static void
|
|
client_tls_writecb(int fd, short event, void *d)
|
|
{
|
|
struct bufferevent *bufev = d;
|
|
struct client *client = bufev->cbarg;
|
|
ssize_t ret;
|
|
size_t len;
|
|
short what = EVBUFFER_WRITE;
|
|
|
|
if (event == EV_TIMEOUT) {
|
|
what |= EVBUFFER_TIMEOUT;
|
|
goto err;
|
|
}
|
|
|
|
if (EVBUFFER_LENGTH(bufev->output) != 0) {
|
|
ret = tls_write(client->ctx,
|
|
EVBUFFER_DATA(bufev->output),
|
|
EVBUFFER_LENGTH(bufev->output));
|
|
switch (ret) {
|
|
case TLS_WANT_POLLIN:
|
|
case TLS_WANT_POLLOUT:
|
|
goto retry;
|
|
case -1:
|
|
what |= EVBUFFER_ERROR;
|
|
goto err;
|
|
}
|
|
len = ret;
|
|
evbuffer_drain(bufev->output, len);
|
|
}
|
|
|
|
if (EVBUFFER_LENGTH(bufev->output) != 0)
|
|
event_add(&bufev->ev_write, NULL);
|
|
|
|
if (bufev->writecb != NULL &&
|
|
EVBUFFER_LENGTH(bufev->output) <= bufev->wm_write.low)
|
|
(*bufev->writecb)(bufev, bufev->cbarg);
|
|
return;
|
|
|
|
retry:
|
|
event_add(&bufev->ev_write, NULL);
|
|
return;
|
|
err:
|
|
log_warnx("tls error: %s", tls_error(client->ctx));
|
|
(*bufev->errorcb)(bufev, what, bufev->cbarg);
|
|
}
|
|
|
|
static void
|
|
client_read(struct bufferevent *bev, void *d)
|
|
{
|
|
struct stat sb;
|
|
struct client *c = d;
|
|
struct evbuffer *src = EVBUFFER_INPUT(bev);
|
|
const char *path, *p, *parse_err = "invalid request";
|
|
char decoded[DOMAIN_NAME_LEN];
|
|
|
|
bufferevent_disable(bev, EVBUFFER_READ);
|
|
|
|
/*
|
|
* libevent2 can still somehow call this function, even
|
|
* though I never enable EV_READ in the bufferevent. If
|
|
* that's the case, bail out.
|
|
*/
|
|
if (c->type != REQUEST_UNDECIDED)
|
|
return;
|
|
|
|
/* max url len + \r\n */
|
|
if (EVBUFFER_LENGTH(src) > 1024 + 2) {
|
|
log_debug("too much data received");
|
|
start_reply(c, BAD_REQUEST, "bad request");
|
|
return;
|
|
}
|
|
|
|
c->req = evbuffer_readln(src, &c->reqlen, EVBUFFER_EOL_CRLF_STRICT);
|
|
if (c->req == NULL) {
|
|
/* not enough data yet. */
|
|
bufferevent_enable(bev, EVBUFFER_READ);
|
|
return;
|
|
}
|
|
if (c->reqlen > 1024+2) {
|
|
log_debug("URL too long");
|
|
start_reply(c, BAD_REQUEST, "bad request");
|
|
return;
|
|
}
|
|
|
|
if (!parse_iri(c->req, &c->iri, &parse_err) ||
|
|
!puny_decode(c->iri.host, decoded, sizeof(decoded), &parse_err)) {
|
|
log_debug("IRI parse error: %s", parse_err);
|
|
start_reply(c, BAD_REQUEST, "bad request");
|
|
return;
|
|
}
|
|
|
|
if (apply_reverse_proxy(c))
|
|
return;
|
|
|
|
/* ignore the port number */
|
|
if (strcmp(c->iri.schema, "gemini") ||
|
|
strcmp(decoded, c->domain)) {
|
|
start_reply(c, PROXY_REFUSED, "won't proxy request");
|
|
return;
|
|
}
|
|
|
|
if (apply_require_ca(c) ||
|
|
apply_block_return(c)||
|
|
apply_fastcgi(c))
|
|
return;
|
|
|
|
path = c->iri.path;
|
|
p = strip_path(path, vhost_strip(c->host, path));
|
|
while (*p == '/')
|
|
p++;
|
|
if (*p == '\0')
|
|
p = ".";
|
|
|
|
c->pfd = openat(vhost_dirfd(c->host, path, &c->loc), p, O_RDONLY);
|
|
if (c->pfd == -1) {
|
|
if (errno == EACCES)
|
|
log_info("can't open %s: %s", p, strerror(errno));
|
|
start_reply(c, NOT_FOUND, "not found");
|
|
return;
|
|
}
|
|
|
|
if (fstat(c->pfd, &sb) == -1) {
|
|
log_warnx("fstat %s", path);
|
|
start_reply(c, TEMP_FAILURE, "internal server error");
|
|
return;
|
|
}
|
|
|
|
if (S_ISDIR(sb.st_mode)) {
|
|
open_dir(c);
|
|
return;
|
|
}
|
|
|
|
c->type = REQUEST_FILE;
|
|
start_reply(c, SUCCESS, mime(c->conf, c->host, p));
|
|
}
|
|
|
|
void
|
|
client_write(struct bufferevent *bev, void *d)
|
|
{
|
|
struct client *c = d;
|
|
struct evbuffer *out = EVBUFFER_OUTPUT(bev);
|
|
char nam[PATH_MAX];
|
|
char buf[BUFSIZ];
|
|
ssize_t r;
|
|
|
|
switch (c->type) {
|
|
case REQUEST_UNDECIDED:
|
|
/*
|
|
* Ignore spurious calls when we still don't have idea
|
|
* what to do with the request.
|
|
*/
|
|
break;
|
|
|
|
case REQUEST_FILE:
|
|
if ((r = read(c->pfd, buf, sizeof(buf))) == -1) {
|
|
log_warn("read");
|
|
client_error(bev, EVBUFFER_ERROR, c);
|
|
return;
|
|
} else if (r == 0) {
|
|
client_close(c);
|
|
return;
|
|
} else if (r != sizeof(buf))
|
|
c->type = REQUEST_DONE;
|
|
bufferevent_write(bev, buf, r);
|
|
break;
|
|
|
|
case REQUEST_DIR:
|
|
/* TODO: handle big big directories better */
|
|
for (c->diroff = 0; c->diroff < c->dirlen; ++c->diroff) {
|
|
const char *sufx = "";
|
|
|
|
encode_path(nam, sizeof(nam),
|
|
c->dir[c->diroff]->d_name);
|
|
if (c->dir[c->diroff]->d_type == DT_DIR)
|
|
sufx = "/";
|
|
evbuffer_add_printf(out, "=> ./%s%s\n", nam, sufx);
|
|
free(c->dir[c->diroff]);
|
|
}
|
|
free(c->dir);
|
|
c->dir = NULL;
|
|
|
|
c->type = REQUEST_DONE;
|
|
|
|
event_add(&c->bev->ev_write, NULL);
|
|
break;
|
|
|
|
case REQUEST_FCGI:
|
|
case REQUEST_PROXY:
|
|
/*
|
|
* Here we depend on fastcgi or proxy connection to
|
|
* provide data.
|
|
*/
|
|
break;
|
|
|
|
case REQUEST_DONE:
|
|
if (EVBUFFER_LENGTH(out) == 0)
|
|
client_close(c);
|
|
break;
|
|
}
|
|
}
|
|
|
|
static void
|
|
client_error(struct bufferevent *bev, short error, void *d)
|
|
{
|
|
struct client *c = d;
|
|
|
|
c->type = REQUEST_DONE;
|
|
|
|
if (error & EVBUFFER_TIMEOUT) {
|
|
log_debug("timeout; forcefully closing the connection");
|
|
if (c->code == 0)
|
|
start_reply(c, BAD_REQUEST, "timeout");
|
|
else
|
|
client_close(c);
|
|
return;
|
|
}
|
|
|
|
if (error & EVBUFFER_EOF) {
|
|
client_close(c);
|
|
return;
|
|
}
|
|
|
|
log_warnx("unknown bufferevent error 0x%x", error);
|
|
client_close(c);
|
|
}
|
|
|
|
void
|
|
start_reply(struct client *c, int code, const char *meta)
|
|
{
|
|
struct evbuffer *evb = EVBUFFER_OUTPUT(c->bev);
|
|
const char *lang;
|
|
int r, rr;
|
|
|
|
bufferevent_enable(c->bev, EVBUFFER_WRITE);
|
|
|
|
c->code = code;
|
|
c->meta = meta;
|
|
|
|
r = evbuffer_add_printf(evb, "%d %s", code, meta);
|
|
if (r == -1)
|
|
goto err;
|
|
|
|
/* 2 digit status + space + 1024 max reply */
|
|
if (r > 1027)
|
|
goto overflow;
|
|
|
|
if (c->type != REQUEST_FCGI &&
|
|
c->type != REQUEST_PROXY &&
|
|
!strcmp(meta, "text/gemini") &&
|
|
(lang = vhost_lang(c->host, c->iri.path)) != NULL) {
|
|
rr = evbuffer_add_printf(evb, ";lang=%s", lang);
|
|
if (rr == -1)
|
|
goto err;
|
|
if (r + rr > 1027)
|
|
goto overflow;
|
|
}
|
|
|
|
bufferevent_write(c->bev, "\r\n", 2);
|
|
|
|
if (!vhost_disable_log(c->host, c->iri.path))
|
|
log_request(c, code, meta);
|
|
|
|
if (code != 20)
|
|
c->type = REQUEST_DONE;
|
|
|
|
return;
|
|
|
|
err:
|
|
log_warnx("evbuffer_add_printf error: no memory");
|
|
evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
|
|
client_close(c);
|
|
return;
|
|
|
|
overflow:
|
|
log_warnx("reply header overflow");
|
|
evbuffer_drain(evb, EVBUFFER_LENGTH(evb));
|
|
start_reply(c, TEMP_FAILURE, "internal error");
|
|
}
|
|
|
|
static void
|
|
client_close_ev(int fd, short event, void *d)
|
|
{
|
|
struct client *c = d;
|
|
|
|
switch (tls_close(c->ctx)) {
|
|
case TLS_WANT_POLLIN:
|
|
event_once(c->fd, EV_READ, client_close_ev, c, NULL);
|
|
return;
|
|
case TLS_WANT_POLLOUT:
|
|
event_once(c->fd, EV_WRITE, client_close_ev, c, NULL);
|
|
return;
|
|
}
|
|
|
|
connected_clients--;
|
|
|
|
free(c->req);
|
|
|
|
tls_free(c->ctx);
|
|
c->ctx = NULL;
|
|
|
|
free(c->header);
|
|
|
|
if (c->pfd != -1)
|
|
close(c->pfd);
|
|
|
|
if (c->dir != NULL)
|
|
free(c->dir);
|
|
|
|
close(c->fd);
|
|
c->fd = -1;
|
|
|
|
free(c);
|
|
}
|
|
|
|
static void
|
|
client_proxy_close(int fd, short event, void *d)
|
|
{
|
|
struct tls *ctx = d;
|
|
|
|
if (ctx == NULL) {
|
|
close(fd);
|
|
return;
|
|
}
|
|
|
|
switch (tls_close(ctx)) {
|
|
case TLS_WANT_POLLIN:
|
|
event_once(fd, EV_READ, client_proxy_close, d, NULL);
|
|
break;
|
|
case TLS_WANT_POLLOUT:
|
|
event_once(fd, EV_WRITE, client_proxy_close, d, NULL);
|
|
break;
|
|
}
|
|
|
|
tls_free(ctx);
|
|
close(fd);
|
|
}
|
|
|
|
void
|
|
client_close(struct client *c)
|
|
{
|
|
/*
|
|
* We may end up calling client_close in various situations
|
|
* and for the most unexpected reasons. Therefore, we need to
|
|
* ensure that everything gets properly released once we reach
|
|
* this point.
|
|
*/
|
|
|
|
SPLAY_REMOVE(client_tree_id, &clients, c);
|
|
|
|
if (c->cgibev != NULL) {
|
|
bufferevent_disable(c->cgibev, EVBUFFER_READ|EVBUFFER_WRITE);
|
|
bufferevent_free(c->cgibev);
|
|
c->cgibev = NULL;
|
|
close(c->pfd);
|
|
c->pfd = -1;
|
|
}
|
|
|
|
if (c->bev != NULL) {
|
|
bufferevent_disable(c->bev, EVBUFFER_READ|EVBUFFER_WRITE);
|
|
bufferevent_free(c->bev);
|
|
}
|
|
|
|
if (c->proxyevset &&
|
|
event_pending(&c->proxyev, EV_READ|EV_WRITE, NULL)) {
|
|
c->proxyevset = 0;
|
|
event_del(&c->proxyev);
|
|
}
|
|
|
|
if (c->pfd != -1 && c->proxyctx != NULL) {
|
|
/* shut down the proxy TLS connection */
|
|
client_proxy_close(c->pfd, 0, c->proxyctx);
|
|
c->pfd = -1;
|
|
}
|
|
|
|
if (c->proxybev != NULL)
|
|
bufferevent_free(c->proxybev);
|
|
|
|
client_close_ev(c->fd, 0, c);
|
|
}
|
|
|
|
void
|
|
do_accept(int sock, short et, void *d)
|
|
{
|
|
struct address *addr = d;
|
|
struct client *c;
|
|
struct sockaddr_storage raddr;
|
|
struct sockaddr *sraddr;
|
|
socklen_t len;
|
|
int e, fd;
|
|
|
|
sraddr = (struct sockaddr *)&raddr;
|
|
len = sizeof(raddr);
|
|
if ((fd = accept(sock, sraddr, &len)) == -1) {
|
|
if (errno == EWOULDBLOCK || errno == EAGAIN ||
|
|
errno == ECONNABORTED)
|
|
return;
|
|
fatal("accept");
|
|
}
|
|
|
|
mark_nonblock(fd);
|
|
|
|
c = xcalloc(1, sizeof(*c));
|
|
c->conf = addr->conf;
|
|
c->addr = addr;
|
|
c->id = ++server_client_id;
|
|
c->fd = fd;
|
|
c->pfd = -1;
|
|
memcpy(&c->raddr, &raddr, sizeof(raddr));
|
|
c->raddrlen = len;
|
|
|
|
e = getnameinfo(sraddr, len, c->rhost, sizeof(c->rhost),
|
|
c->rserv, sizeof(c->rserv), NI_NUMERICHOST | NI_NUMERICSERV);
|
|
if (e != 0) {
|
|
log_warnx("getnameinfo failed: %s", gai_strerror(e));
|
|
close(c->fd);
|
|
free(c);
|
|
return;
|
|
}
|
|
|
|
if (tls_accept_socket(addr->ctx, &c->ctx, fd) == -1) {
|
|
log_warnx("failed to accept socket: %s", tls_error(c->ctx));
|
|
close(c->fd);
|
|
free(c);
|
|
return;
|
|
}
|
|
|
|
SPLAY_INSERT(client_tree_id, &clients, c);
|
|
event_once(c->fd, EV_READ|EV_WRITE, handle_handshake, c, NULL);
|
|
connected_clients++;
|
|
}
|
|
|
|
struct client *
|
|
client_by_id(int id)
|
|
{
|
|
struct client find;
|
|
|
|
find.id = id;
|
|
return SPLAY_FIND(client_tree_id, &clients, &find);
|
|
}
|
|
|
|
static void
|
|
handle_siginfo(int fd, short ev, void *d)
|
|
{
|
|
log_info("%d connected clients", connected_clients);
|
|
}
|
|
|
|
static void
|
|
add_matching_kps(struct tls_config *tlsconf, struct address *addr,
|
|
struct conf *conf)
|
|
{
|
|
struct address *vaddr;
|
|
struct vhost *h;
|
|
int r, any = 0;
|
|
|
|
TAILQ_FOREACH(h, &conf->hosts, vhosts) {
|
|
TAILQ_FOREACH(vaddr, &h->addrs, addrs) {
|
|
if (!match_addr(addr, vaddr))
|
|
continue;
|
|
|
|
if (!any) {
|
|
any = 1;
|
|
r = tls_config_set_keypair_ocsp_mem(tlsconf,
|
|
h->cert, h->certlen, h->key, h->keylen,
|
|
h->ocsp, h->ocsplen);
|
|
} else {
|
|
r = tls_config_add_keypair_ocsp_mem(tlsconf,
|
|
h->cert, h->certlen, h->key, h->keylen,
|
|
h->ocsp, h->ocsplen);
|
|
}
|
|
|
|
if (r == -1)
|
|
fatalx("failed to load keypair"
|
|
" for host %s: %s", h->domain,
|
|
tls_config_error(tlsconf));
|
|
}
|
|
}
|
|
}
|
|
|
|
static void
|
|
setup_tls(struct conf *conf)
|
|
{
|
|
struct tls_config *tlsconf;
|
|
struct address *addr;
|
|
|
|
TAILQ_FOREACH(addr, &conf->addrs, addrs) {
|
|
if ((tlsconf = tls_config_new()) == NULL)
|
|
fatal("tls_config_new");
|
|
|
|
if (conf->use_privsep_crypto)
|
|
tls_config_use_fake_private_key(tlsconf);
|
|
|
|
/* optionally accept client certs but don't verify */
|
|
tls_config_verify_client_optional(tlsconf);
|
|
tls_config_insecure_noverifycert(tlsconf);
|
|
|
|
if (tls_config_set_protocols(tlsconf, conf->protos) == -1)
|
|
fatalx("tls_config_set_protocols: %s",
|
|
tls_config_error(tlsconf));
|
|
|
|
add_matching_kps(tlsconf, addr, conf);
|
|
|
|
tls_reset(addr->ctx);
|
|
if (tls_configure(addr->ctx, tlsconf) == -1)
|
|
fatalx("tls_configure: %s", tls_error(addr->ctx));
|
|
|
|
tls_config_free(tlsconf);
|
|
}
|
|
}
|
|
|
|
static void
|
|
load_vhosts(struct conf *conf)
|
|
{
|
|
struct vhost *h;
|
|
struct location *l;
|
|
|
|
TAILQ_FOREACH(h, &conf->hosts, vhosts) {
|
|
TAILQ_FOREACH(l, &h->locations, locations) {
|
|
if (*l->dir == '\0')
|
|
continue;
|
|
l->dirfd = open(l->dir, O_RDONLY | O_DIRECTORY);
|
|
if (l->dirfd == -1)
|
|
fatal("open %s for domain %s", l->dir,
|
|
h->domain);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
server(struct privsep *ps, struct privsep_proc *p)
|
|
{
|
|
proc_run(ps, p, procs, nitems(procs), server_init, NULL);
|
|
}
|
|
|
|
void
|
|
server_init(struct privsep *ps, struct privsep_proc *p, void *arg)
|
|
{
|
|
struct conf *c;
|
|
|
|
SPLAY_INIT(&clients);
|
|
|
|
#ifdef SIGINFO
|
|
signal_set(&siginfo, SIGINFO, &handle_siginfo, NULL);
|
|
signal_add(&siginfo, NULL);
|
|
#endif
|
|
signal_set(&sigusr2, SIGUSR2, &handle_siginfo, NULL);
|
|
signal_add(&sigusr2, NULL);
|
|
|
|
sandbox_server_process();
|
|
|
|
/*
|
|
* ge doesn't use the privsep crypto engine; it doesn't use
|
|
* privsep at all so `ps' is NULL.
|
|
*/
|
|
if (ps != NULL) {
|
|
c = ps->ps_env;
|
|
if (c->use_privsep_crypto)
|
|
crypto_engine_init(ps->ps_env);
|
|
}
|
|
}
|
|
|
|
int
|
|
server_configure_done(struct conf *conf)
|
|
{
|
|
struct address *addr;
|
|
|
|
if (load_default_mime(&conf->mime) == -1)
|
|
fatal("can't load default mime");
|
|
sort_mime(&conf->mime);
|
|
setup_tls(conf);
|
|
load_vhosts(conf);
|
|
|
|
TAILQ_FOREACH(addr, &conf->addrs, addrs) {
|
|
if (addr->sock != -1)
|
|
event_add(&addr->evsock, NULL);
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
server_dispatch_parent(int fd, struct privsep_proc *p, struct imsg *imsg)
|
|
{
|
|
struct privsep *ps = p->p_ps;
|
|
struct conf *conf = ps->ps_env;
|
|
|
|
switch (imsg->hdr.type) {
|
|
case IMSG_RECONF_START:
|
|
case IMSG_RECONF_MIME:
|
|
case IMSG_RECONF_PROTOS:
|
|
case IMSG_RECONF_SOCK:
|
|
case IMSG_RECONF_FCGI:
|
|
case IMSG_RECONF_HOST:
|
|
case IMSG_RECONF_CERT:
|
|
case IMSG_RECONF_KEY:
|
|
case IMSG_RECONF_OCSP:
|
|
case IMSG_RECONF_HOST_ADDR:
|
|
case IMSG_RECONF_LOC:
|
|
case IMSG_RECONF_ENV:
|
|
case IMSG_RECONF_ALIAS:
|
|
case IMSG_RECONF_PROXY:
|
|
case IMSG_RECONF_PROXY_CERT:
|
|
case IMSG_RECONF_PROXY_KEY:
|
|
return config_recv(conf, imsg);
|
|
case IMSG_RECONF_END:
|
|
if (config_recv(conf, imsg) == -1)
|
|
return -1;
|
|
if (server_configure_done(conf) == -1)
|
|
return -1;
|
|
break;
|
|
default:
|
|
return -1;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
server_dispatch_crypto(int fd, struct privsep_proc *p, struct imsg *imsg)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
static int
|
|
server_dispatch_logger(int fd, struct privsep_proc *p, struct imsg *imsg)
|
|
{
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
client_tree_cmp(struct client *a, struct client *b)
|
|
{
|
|
if (a->id == b->id)
|
|
return 0;
|
|
else if (a->id < b->id)
|
|
return -1;
|
|
else
|
|
return +1;
|
|
}
|
|
|
|
SPLAY_GENERATE(client_tree_id, client, entry, client_tree_cmp)
|