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author | Gilles Chehade <gilles@poolp.org> | 2020-05-22 14:35:25 +0200 |
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committer | Gilles Chehade <gilles@poolp.org> | 2020-05-22 14:35:25 +0200 |
commit | 054cadd5524759b57aefb39659356552091118d9 (patch) | |
tree | 8c5c4896773cf10306211ec44c6cadb88a5a2ed7 /smtpd/cert.c | |
parent | Revert "moving smtpd to usr.sbin/smtpd to ease cherry-picking of upstream" (diff) | |
download | OpenSMTPD-054cadd5524759b57aefb39659356552091118d9.tar.xz OpenSMTPD-054cadd5524759b57aefb39659356552091118d9.zip |
move smtpd to usr.sbin to ease upstream cherry-picking
Diffstat (limited to 'smtpd/cert.c')
-rw-r--r-- | smtpd/cert.c | 416 |
1 files changed, 0 insertions, 416 deletions
diff --git a/smtpd/cert.c b/smtpd/cert.c deleted file mode 100644 index 79b1df91..00000000 --- a/smtpd/cert.c +++ /dev/null @@ -1,416 +0,0 @@ -/* $OpenBSD: cert.c,v 1.2 2018/12/11 07:25:57 eric Exp $ */ - -/* - * Copyright (c) 2018 Eric Faurot <eric@openbsd.org> - * - * Permission to use, copy, modify, and distribute this software for any - * purpose with or without fee is hereby granted, provided that the above - * copyright notice and this permission notice appear in all copies. - * - * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES - * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF - * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR - * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES - * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN - * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF - * OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE. - */ - -#include "includes.h" - -#include <sys/types.h> -#include <sys/socket.h> -#include <sys/tree.h> -#include <sys/queue.h> -#include <netinet/in.h> - -#include <imsg.h> -#include <limits.h> -#include <openssl/err.h> -#include <openssl/ssl.h> -#include <stdio.h> -#include <string.h> - -#include "log.h" -#include "smtpd.h" -#include "ssl.h" - -#define p_cert p_lka - -struct request { - SPLAY_ENTRY(request) entry; - uint32_t id; - void (*cb_get_certificate)(void *, int, const char *, - const void *, size_t); - void (*cb_verify)(void *, int); - void *arg; -}; - -#define MAX_CERTS 16 -#define MAX_CERT_LEN (MAX_IMSGSIZE - (IMSG_HEADER_SIZE + sizeof(size_t))) - -struct session { - SPLAY_ENTRY(session) entry; - uint32_t id; - struct mproc *proc; - char *cert[MAX_CERTS]; - size_t cert_len[MAX_CERTS]; - int cert_count; -}; - -SPLAY_HEAD(cert_reqtree, request); -SPLAY_HEAD(cert_sestree, session); - -static int request_cmp(struct request *, struct request *); -static int session_cmp(struct session *, struct session *); -SPLAY_PROTOTYPE(cert_reqtree, request, entry, request_cmp); -SPLAY_PROTOTYPE(cert_sestree, session, entry, session_cmp); - -static void cert_do_verify(struct session *, const char *, int); -static int cert_X509_verify(struct session *, const char *, const char *); - -static struct cert_reqtree reqs = SPLAY_INITIALIZER(&reqs); -static struct cert_sestree sess = SPLAY_INITIALIZER(&sess); - -int -cert_init(const char *name, int fallback, void (*cb)(void *, int, - const char *, const void *, size_t), void *arg) -{ - struct request *req; - - req = calloc(1, sizeof(*req)); - if (req == NULL) { - cb(arg, CA_FAIL, NULL, NULL, 0); - return 0; - } - while (req->id == 0 || SPLAY_FIND(cert_reqtree, &reqs, req)) - req->id = arc4random(); - req->cb_get_certificate = cb; - req->arg = arg; - SPLAY_INSERT(cert_reqtree, &reqs, req); - - m_create(p_cert, IMSG_CERT_INIT, req->id, 0, -1); - m_add_string(p_cert, name); - m_add_int(p_cert, fallback); - m_close(p_cert); - - return 1; -} - -int -cert_verify(const void *ssl, const char *name, int fallback, - void (*cb)(void *, int), void *arg) -{ - struct request *req; - X509 *x; - STACK_OF(X509) *xchain; - unsigned char *cert_der[MAX_CERTS]; - int cert_len[MAX_CERTS]; - int i, cert_count, ret; - - x = SSL_get_peer_certificate(ssl); - if (x == NULL) { - cb(arg, CERT_NOCERT); - return 0; - } - - ret = 0; - memset(cert_der, 0, sizeof(cert_der)); - - req = calloc(1, sizeof(*req)); - if (req == NULL) - goto end; - while (req->id == 0 || SPLAY_FIND(cert_reqtree, &reqs, req)) - req->id = arc4random(); - req->cb_verify = cb; - req->arg = arg; - SPLAY_INSERT(cert_reqtree, &reqs, req); - - cert_count = 1; - if ((xchain = SSL_get_peer_cert_chain(ssl))) { - cert_count += sk_X509_num(xchain); - if (cert_count > MAX_CERTS) { - log_warnx("warn: certificate chain too long"); - goto end; - } - } - - for (i = 0; i < cert_count; ++i) { - if (i != 0) { - if ((x = sk_X509_value(xchain, i - 1)) == NULL) { - log_warnx("warn: failed to retrieve certificate"); - goto end; - } - } - - cert_len[i] = i2d_X509(x, &cert_der[i]); - if (i == 0) - X509_free(x); - - if (cert_len[i] < 0) { - log_warnx("warn: failed to encode certificate"); - goto end; - } - - log_debug("debug: certificate %i: len=%d", i, cert_len[i]); - if (cert_len[i] > (int)MAX_CERT_LEN) { - log_warnx("warn: certificate too long"); - goto end; - } - } - - /* Send the cert chain, one cert at a time */ - for (i = 0; i < cert_count; ++i) { - m_create(p_cert, IMSG_CERT_CERTIFICATE, req->id, 0, -1); - m_add_data(p_cert, cert_der[i], cert_len[i]); - m_close(p_cert); - } - - /* Tell lookup process that it can start verifying, we're done */ - m_create(p_cert, IMSG_CERT_VERIFY, req->id, 0, -1); - m_add_string(p_cert, name); - m_add_int(p_cert, fallback); - m_close(p_cert); - - ret = 1; - - end: - for (i = 0; i < MAX_CERTS; ++i) - free(cert_der[i]); - - if (ret == 0) { - if (req) - SPLAY_REMOVE(cert_reqtree, &reqs, req); - free(req); - cb(arg, CERT_ERROR); - } - - return ret; -} - - -void -cert_dispatch_request(struct mproc *proc, struct imsg *imsg) -{ - struct pki *pki; - struct session key, *s; - const char *name; - const void *data; - size_t datalen; - struct msg m; - uint32_t reqid; - char buf[LINE_MAX]; - int fallback; - - reqid = imsg->hdr.peerid; - m_msg(&m, imsg); - - switch (imsg->hdr.type) { - - case IMSG_CERT_INIT: - m_get_string(&m, &name); - m_get_int(&m, &fallback); - m_end(&m); - - xlowercase(buf, name, sizeof(buf)); - log_debug("debug: looking up pki \"%s\"", buf); - pki = dict_get(env->sc_pki_dict, buf); - if (pki == NULL && fallback) - pki = dict_get(env->sc_pki_dict, "*"); - - m_create(proc, IMSG_CERT_INIT, reqid, 0, -1); - if (pki) { - m_add_int(proc, CA_OK); - m_add_string(proc, pki->pki_name); - m_add_data(proc, pki->pki_cert, pki->pki_cert_len); - } else { - m_add_int(proc, CA_FAIL); - m_add_string(proc, NULL); - m_add_data(proc, NULL, 0); - } - m_close(proc); - return; - - case IMSG_CERT_CERTIFICATE: - m_get_data(&m, &data, &datalen); - m_end(&m); - - key.id = reqid; - key.proc = proc; - s = SPLAY_FIND(cert_sestree, &sess, &key); - if (s == NULL) { - s = calloc(1, sizeof(*s)); - s->proc = proc; - s->id = reqid; - SPLAY_INSERT(cert_sestree, &sess, s); - } - - if (s->cert_count == MAX_CERTS) - fatalx("%s: certificate chain too long", __func__); - - s->cert[s->cert_count] = xmemdup(data, datalen); - s->cert_len[s->cert_count] = datalen; - s->cert_count++; - return; - - case IMSG_CERT_VERIFY: - m_get_string(&m, &name); - m_get_int(&m, &fallback); - m_end(&m); - - key.id = reqid; - key.proc = proc; - s = SPLAY_FIND(cert_sestree, &sess, &key); - if (s == NULL) - fatalx("%s: no certificate", __func__); - - SPLAY_REMOVE(cert_sestree, &sess, s); - cert_do_verify(s, name, fallback); - return; - - default: - fatalx("%s: %s", __func__, imsg_to_str(imsg->hdr.type)); - } -} - -void -cert_dispatch_result(struct mproc *proc, struct imsg *imsg) -{ - struct request key, *req; - struct msg m; - const void *cert; - const char *name; - size_t cert_len; - int res; - - key.id = imsg->hdr.peerid; - req = SPLAY_FIND(cert_reqtree, &reqs, &key); - if (req == NULL) - fatalx("%s: unknown request %08x", __func__, imsg->hdr.peerid); - - m_msg(&m, imsg); - - switch (imsg->hdr.type) { - - case IMSG_CERT_INIT: - m_get_int(&m, &res); - m_get_string(&m, &name); - m_get_data(&m, &cert, &cert_len); - m_end(&m); - SPLAY_REMOVE(cert_reqtree, &reqs, req); - req->cb_get_certificate(req->arg, res, name, cert, cert_len); - free(req); - break; - - case IMSG_CERT_VERIFY: - m_get_int(&m, &res); - m_end(&m); - SPLAY_REMOVE(cert_reqtree, &reqs, req); - req->cb_verify(req->arg, res); - free(req); - break; - } -} - -static void -cert_do_verify(struct session *s, const char *name, int fallback) -{ - struct ca *ca; - const char *cafile; - int i, res; - - ca = dict_get(env->sc_ca_dict, name); - if (ca == NULL) - if (fallback) - ca = dict_get(env->sc_ca_dict, "*"); - cafile = ca ? ca->ca_cert_file : CA_FILE; - - if (ca == NULL && !fallback) - res = CERT_NOCA; - else if (!cert_X509_verify(s, cafile, NULL)) - res = CERT_INVALID; - else - res = CERT_OK; - - for (i = 0; i < s->cert_count; ++i) - free(s->cert[i]); - - m_create(s->proc, IMSG_CERT_VERIFY, s->id, 0, -1); - m_add_int(s->proc, res); - m_close(s->proc); - - free(s); -} - -static int -cert_X509_verify(struct session *s, const char *CAfile, - const char *CRLfile) -{ - X509 *x509; - X509 *x509_tmp; - STACK_OF(X509) *x509_chain; - const unsigned char *d2i; - int i, ret = 0; - const char *errstr; - - x509 = NULL; - x509_tmp = NULL; - x509_chain = NULL; - - d2i = s->cert[0]; - if (d2i_X509(&x509, &d2i, s->cert_len[0]) == NULL) { - x509 = NULL; - goto end; - } - - if (s->cert_count > 1) { - x509_chain = sk_X509_new_null(); - for (i = 1; i < s->cert_count; ++i) { - d2i = s->cert[i]; - if (d2i_X509(&x509_tmp, &d2i, s->cert_len[i]) == NULL) - goto end; - sk_X509_insert(x509_chain, x509_tmp, i); - x509_tmp = NULL; - } - } - if (!ca_X509_verify(x509, x509_chain, CAfile, NULL, &errstr)) - log_debug("debug: X509 verify: %s", errstr); - else - ret = 1; - -end: - X509_free(x509); - X509_free(x509_tmp); - if (x509_chain) - sk_X509_pop_free(x509_chain, X509_free); - - return ret; -} - -static int -request_cmp(struct request *a, struct request *b) -{ - if (a->id < b->id) - return -1; - if (a->id > b->id) - return 1; - return 0; -} - -SPLAY_GENERATE(cert_reqtree, request, entry, request_cmp); - -static int -session_cmp(struct session *a, struct session *b) -{ - if (a->id < b->id) - return -1; - if (a->id > b->id) - return 1; - if (a->proc < b->proc) - return -1; - if (a->proc > b->proc) - return 1; - return 0; -} - -SPLAY_GENERATE(cert_sestree, session, entry, session_cmp); |