mirror of
https://github.com/omar-polo/gmid.git
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the executor forks to spawn the cgi scripts, and they inherit the socket for communication with the listener process. Make that impossible.
604 lines
12 KiB
C
604 lines
12 KiB
C
/*
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* Copyright (c) 2020 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 <sys/stat.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <limits.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <string.h>
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#include <openssl/pem.h>
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#include <openssl/x509.h>
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#include "gmid.h"
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struct vhost hosts[HOSTSLEN];
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int exfd, foreground, verbose;
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struct conf conf;
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struct tls *ctx;
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void
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fatal(const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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if (foreground) {
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vfprintf(stderr, fmt, ap);
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fprintf(stderr, "\n");
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} else
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vsyslog(LOG_DAEMON | LOG_CRIT, fmt, ap);
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va_end(ap);
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exit(1);
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}
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void
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logs(int priority, struct client *c,
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const char *fmt, ...)
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{
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char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV];
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char *fmted, *s;
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size_t len;
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int ec;
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va_list ap;
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if (foreground && !verbose) {
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if (priority == LOG_DEBUG || priority == LOG_INFO)
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return;
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}
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va_start(ap, fmt);
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if (c == NULL) {
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strncpy(hbuf, "<internal>", sizeof(hbuf));
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sbuf[0] = '\0';
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} else {
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len = sizeof(c->addr);
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ec = getnameinfo((struct sockaddr*)&c->addr, len,
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hbuf, sizeof(hbuf),
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sbuf, sizeof(sbuf),
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NI_NUMERICHOST | NI_NUMERICSERV);
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if (ec != 0)
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fatal("getnameinfo: %s", gai_strerror(ec));
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}
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if (vasprintf(&fmted, fmt, ap) == -1)
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fatal("vasprintf: %s", strerror(errno));
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if (foreground)
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fprintf(stderr, "%s:%s %s\n", hbuf, sbuf, fmted);
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else {
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if (asprintf(&s, "%s:%s %s", hbuf, sbuf, fmted) == -1)
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fatal("asprintf: %s", strerror(errno));
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syslog(priority | LOG_DAEMON, "%s", s);
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free(s);
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}
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free(fmted);
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va_end(ap);
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}
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/* strchr, but with a bound */
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static char *
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gmid_strnchr(char *s, int c, size_t len)
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{
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size_t i;
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for (i = 0; i < len; ++i)
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if (s[i] == c)
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return &s[i];
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return NULL;
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}
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void
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log_request(struct client *c, char *meta, size_t l)
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{
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char hbuf[NI_MAXHOST], sbuf[NI_MAXSERV], b[GEMINI_URL_LEN];
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char *t;
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size_t len;
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int ec;
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len = sizeof(c->addr);
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ec = getnameinfo((struct sockaddr*)&c->addr, len,
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hbuf, sizeof(hbuf),
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sbuf, sizeof(sbuf),
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NI_NUMERICHOST | NI_NUMERICSERV);
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if (ec != 0)
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fatal("getnameinfo: %s", gai_strerror(ec));
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if (c->iri.schema != NULL) {
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/* serialize the IRI */
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strlcpy(b, c->iri.schema, sizeof(b));
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strlcat(b, "://", sizeof(b));
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/* log the decoded host name, but if it was invalid
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* use the raw one. */
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if (*c->domain != '\0')
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strlcat(b, c->domain, sizeof(b));
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else
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strlcat(b, c->iri.host, sizeof(b));
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strlcat(b, "/", sizeof(b));
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strlcat(b, c->iri.path, sizeof(b)); /* TODO: sanitize UTF8 */
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if (*c->iri.query != '\0') { /* TODO: sanitize UTF8 */
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strlcat(b, "?", sizeof(b));
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strlcat(b, c->iri.query, sizeof(b));
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}
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} else {
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strlcpy(b, c->req, sizeof(b));
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}
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if ((t = gmid_strnchr(meta, '\r', l)) == NULL)
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t = meta + len;
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if (foreground)
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fprintf(stderr, "%s:%s GET %s %.*s\n", hbuf, sbuf, b,
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(int)(t - meta), meta);
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else
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syslog(LOG_INFO | LOG_DAEMON, "%s:%s GET %s %.*s",
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hbuf, sbuf, b, (int)(t - meta), meta);
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}
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void
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sig_handler(int sig)
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{
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(void)sig;
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}
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void
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gen_certificate(const char *host, const char *certpath, const char *keypath)
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{
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BIGNUM e;
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EVP_PKEY *pkey;
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RSA *rsa;
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X509 *x509;
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X509_NAME *name;
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FILE *f;
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const char *org = "gmid";
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LOGN(NULL, "generating new certificate for %s (it could take a while)",
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host);
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if ((pkey = EVP_PKEY_new()) == NULL)
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fatal("couldn't create a new private key");
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if ((rsa = RSA_new()) == NULL)
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fatal("could'nt generate rsa");
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BN_init(&e);
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BN_set_word(&e, 17);
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if (!RSA_generate_key_ex(rsa, 4096, &e, NULL))
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fatal("couldn't generate a rsa key");
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if (!EVP_PKEY_assign_RSA(pkey, rsa))
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fatal("couldn't assign the key");
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if ((x509 = X509_new()) == NULL)
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fatal("couldn't generate the X509 certificate");
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ASN1_INTEGER_set(X509_get_serialNumber(x509), 1);
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X509_gmtime_adj(X509_get_notBefore(x509), 0);
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X509_gmtime_adj(X509_get_notAfter(x509), 315360000L); /* 10 years */
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if (!X509_set_pubkey(x509, pkey))
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fatal("couldn't set the public key");
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name = X509_get_subject_name(x509);
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if (!X509_NAME_add_entry_by_txt(name, "O", MBSTRING_ASC, org, -1, -1, 0))
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fatal("couldn't add N to cert");
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if (!X509_NAME_add_entry_by_txt(name, "CN", MBSTRING_ASC, host, -1, -1, 0))
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fatal("couldn't add CN to cert");
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X509_set_issuer_name(x509, name);
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if (!X509_sign(x509, pkey, EVP_sha256()))
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fatal("couldn't sign the certificate");
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if ((f = fopen(keypath, "w")) == NULL)
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fatal("fopen(%s): %s", keypath, strerror(errno));
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if (!PEM_write_PrivateKey(f, pkey, NULL, NULL, 0, NULL, NULL))
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fatal("couldn't write private key");
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fclose(f);
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if ((f = fopen(certpath, "w")) == NULL)
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fatal("fopen(%s): %s", certpath, strerror(errno));
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if (!PEM_write_X509(f, x509))
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fatal("couldn't write cert");
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fclose(f);
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X509_free(x509);
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RSA_free(rsa);
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}
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/* XXX: create recursively */
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void
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mkdirs(const char *path)
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{
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if (mkdir(path, 0755) == -1 && errno != EEXIST)
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fatal("can't mkdir %s: %s", path, strerror(errno));
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}
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/* $XDG_DATA_HOME/gmid */
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char *
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data_dir(void)
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{
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const char *home, *xdg;
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char *t;
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if ((xdg = getenv("XDG_DATA_HOME")) == NULL) {
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if ((home = getenv("HOME")) == NULL)
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errx(1, "XDG_DATA_HOME and HOME both empty");
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if (asprintf(&t, "%s/.local/share/gmid", home) == -1)
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err(1, "asprintf");
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mkdirs(t);
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return t;
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}
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if (asprintf(&t, "%s/gmid", xdg) == -1)
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err(1, "asprintf");
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mkdirs(t);
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return t;
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}
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void
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load_local_cert(const char *hostname, const char *dir)
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{
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char *cert, *key;
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if (asprintf(&cert, "%s/%s.cert.pem", dir, hostname) == -1)
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errx(1, "asprintf");
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if (asprintf(&key, "%s/%s.key.pem", dir, hostname) == -1)
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errx(1, "asprintf");
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if (access(cert, R_OK) == -1 || access(key, R_OK) == -1)
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gen_certificate(hostname, cert, key);
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hosts[0].cert = cert;
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hosts[0].key = key;
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hosts[0].domain = hostname;
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}
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void
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load_vhosts(void)
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{
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struct vhost *h;
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for (h = hosts; h->domain != NULL; ++h) {
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if ((h->dirfd = open(h->dir, O_RDONLY | O_DIRECTORY)) == -1)
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fatal("open %s for domain %s", h->dir, h->domain);
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}
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}
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int
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make_socket(int port, int family)
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{
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int sock, v;
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struct sockaddr_in addr4;
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struct sockaddr_in6 addr6;
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struct sockaddr *addr;
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socklen_t len;
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switch (family) {
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case AF_INET:
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bzero(&addr4, sizeof(addr4));
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addr4.sin_family = family;
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addr4.sin_port = htons(port);
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addr4.sin_addr.s_addr = INADDR_ANY;
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addr = (struct sockaddr*)&addr4;
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len = sizeof(addr4);
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break;
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case AF_INET6:
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bzero(&addr6, sizeof(addr6));
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addr6.sin6_family = AF_INET6;
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addr6.sin6_port = htons(port);
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addr6.sin6_addr = in6addr_any;
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addr = (struct sockaddr*)&addr6;
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len = sizeof(addr6);
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break;
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default:
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/* unreachable */
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abort();
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}
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if ((sock = socket(family, SOCK_STREAM, 0)) == -1)
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fatal("socket: %s", strerror(errno));
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v = 1;
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &v, sizeof(v)) == -1)
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fatal("setsockopt(SO_REUSEADDR): %s", strerror(errno));
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v = 1;
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if (setsockopt(sock, SOL_SOCKET, SO_REUSEPORT, &v, sizeof(v)) == -1)
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fatal("setsockopt(SO_REUSEPORT): %s", strerror(errno));
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mark_nonblock(sock);
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if (bind(sock, addr, len) == -1)
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fatal("bind: %s", strerror(errno));
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if (listen(sock, 16) == -1)
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fatal("listen: %s", strerror(errno));
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return sock;
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}
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void
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setup_tls(void)
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{
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struct tls_config *tlsconf;
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struct vhost *h;
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if ((tlsconf = tls_config_new()) == NULL)
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fatal("tls_config_new");
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/* optionally accept client certs, but don't try to verify them */
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tls_config_verify_client_optional(tlsconf);
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tls_config_insecure_noverifycert(tlsconf);
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if (tls_config_set_protocols(tlsconf, conf.protos) == -1)
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fatal("tls_config_set_protocols");
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if ((ctx = tls_server()) == NULL)
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fatal("tls_server failure");
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/* we need to set something, then we can add how many key we want */
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if (tls_config_set_keypair_file(tlsconf, hosts->cert, hosts->key))
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fatal("tls_config_set_keypair_file failed");
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for (h = &hosts[1]; h->domain != NULL; ++h) {
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if (tls_config_add_keypair_file(tlsconf, h->cert, h->key) == -1)
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fatal("failed to load the keypair (%s, %s)",
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h->cert, h->key);
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}
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if (tls_configure(ctx, tlsconf) == -1)
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fatal("tls_configure: %s", tls_error(ctx));
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}
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int
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listener_main(void)
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{
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int sock4, sock6;
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load_default_mime(&conf.mime);
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sock4 = make_socket(conf.port, AF_INET);
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sock6 = -1;
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if (conf.ipv6)
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sock6 = make_socket(conf.port, AF_INET6);
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load_vhosts();
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sandbox();
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loop(ctx, sock4, sock6);
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return 0;
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}
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void
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init_config(void)
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{
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size_t i;
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bzero(hosts, sizeof(hosts));
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for (i = 0; i < HOSTSLEN; ++i)
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hosts[i].dirfd = -1;
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conf.port = 1965;
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conf.ipv6 = 0;
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conf.protos = TLS_PROTOCOL_TLSv1_2 | TLS_PROTOCOL_TLSv1_3;
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init_mime(&conf.mime);
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conf.chroot = NULL;
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conf.user = NULL;
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}
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void
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drop_priv(void)
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{
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struct passwd *pw = NULL;
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if (conf.chroot != NULL && conf.user == NULL)
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fatal("can't chroot without an user to switch to after.");
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if (conf.user != NULL) {
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if ((pw = getpwnam(conf.user)) == NULL)
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fatal("can't find user %s", conf.user);
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}
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if (conf.chroot != NULL) {
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if (chroot(conf.chroot) != 0 || chdir("/") != 0)
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fatal("%s: %s", conf.chroot, strerror(errno));
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}
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if (pw != NULL) {
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if (setresuid(pw->pw_uid, pw->pw_uid, pw->pw_uid) == -1)
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fatal("setresuid(%d): %s", pw->pw_uid,
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strerror(errno));
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}
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if (getuid() == 0)
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LOGW(NULL, "%s",
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"not a good idea to run a network daemon as root");
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}
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void
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usage(const char *me)
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{
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fprintf(stderr,
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"USAGE: %s [-fn] [-c config] | [-6h] [-d certs-dir] [-H host]"
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" [-p port] [-x cgi] [dir]",
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me);
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}
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int
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main(int argc, char **argv)
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{
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int ch, p[2];
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const char *config_path = NULL, *certs_dir = NULL, *hostname = NULL;
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int conftest = 0, configless = 0;
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init_config();
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while ((ch = getopt(argc, argv, "6c:d:fH:hnp:vx:")) != -1) {
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switch (ch) {
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case '6':
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conf.ipv6 = 1;
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configless = 1;
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break;
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case 'c':
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config_path = optarg;
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break;
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case 'd':
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certs_dir = optarg;
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configless = 1;
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break;
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case 'f':
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foreground = 1;
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break;
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case 'H':
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hostname = optarg;
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configless = 1;
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break;
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case 'h':
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usage(*argv);
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return 0;
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case 'n':
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conftest = 1;
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break;
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case 'p':
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conf.port = parse_portno(optarg);
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configless = 1;
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break;
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case 'v':
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verbose = 1;
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break;
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case 'x':
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/* drop the starting / (if any) */
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if (*optarg == '/')
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optarg++;
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hosts[0].cgi = optarg;
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configless = 1;
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break;
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default:
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usage(*argv);
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return 1;
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}
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}
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argc -= optind;
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argv += optind;
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if (config_path != NULL) {
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if (argc > 0 || configless)
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fatal("can't specify options is config mode.");
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parse_conf(config_path);
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} else {
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configless = 1;
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foreground = 1;
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if (hostname == NULL)
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hostname = "localhost";
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if (certs_dir == NULL)
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certs_dir = data_dir();
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load_local_cert(hostname, certs_dir);
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hosts[0].domain = "*";
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hosts[0].locations[0].auto_index = 1;
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|
hosts[0].locations[0].match = "*";
|
|
|
|
switch (argc) {
|
|
case 0:
|
|
hosts[0].dir = ".";
|
|
break;
|
|
case 1:
|
|
hosts[0].dir = argv[0];
|
|
break;
|
|
default:
|
|
usage(getprogname());
|
|
return 1;
|
|
}
|
|
|
|
LOGN(NULL, "serving %s on port %d", hosts[0].dir, conf.port);
|
|
}
|
|
|
|
if (conftest) {
|
|
puts("config OK");
|
|
return 0;
|
|
}
|
|
|
|
/* setup tls before dropping privileges: we don't want user
|
|
* to put private certs inside the chroot. */
|
|
setup_tls();
|
|
drop_priv();
|
|
|
|
signal(SIGPIPE, SIG_IGN);
|
|
signal(SIGCHLD, SIG_IGN);
|
|
|
|
#ifdef SIGINFO
|
|
signal(SIGINFO, sig_handler);
|
|
#endif
|
|
signal(SIGUSR2, sig_handler);
|
|
signal(SIGHUP, SIG_IGN);
|
|
|
|
if (!foreground && !configless) {
|
|
if (daemon(1, 1) == -1)
|
|
fatal("daemon: %s", strerror(errno));
|
|
}
|
|
|
|
if (socketpair(AF_UNIX, SOCK_STREAM | SOCK_CLOEXEC,
|
|
PF_UNSPEC, p) == -1)
|
|
fatal("socketpair: %s", strerror(errno));
|
|
|
|
switch (fork()) {
|
|
case -1:
|
|
fatal("fork: %s", strerror(errno));
|
|
|
|
case 0: /* child */
|
|
close(p[0]);
|
|
exfd = p[1];
|
|
listener_main();
|
|
_exit(0);
|
|
|
|
default: /* parent */
|
|
close(p[1]);
|
|
return executor_main(p[0]);
|
|
}
|
|
}
|