/*
* Copyright (C) 1999-2001 Tommi Komulainen <Tommi.Komulainen@iki.fi>
- *
+ *
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
- *
+ *
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
- *
+ *
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
#include <openssl/ssl.h>
#include <openssl/x509.h>
+#include <openssl/x509v3.h>
#include <openssl/err.h>
#include <openssl/rand.h>
#include "mutt_menu.h"
#include "mutt_curses.h"
#include "mutt_ssl.h"
+#include "mutt_idna.h"
#if OPENSSL_VERSION_NUMBER >= 0x00904000L
#define READ_X509_KEY(fp, key) PEM_read_X509(fp, key, NULL, NULL)
#define HAVE_ENTROPY() (!access(DEVRANDOM, R_OK) || entropy_byte_count >= 16)
#endif
+/* keep a handle on accepted certificates in case we want to
+ * open up another connection to the same server in this session */
+static STACK_OF(X509) *SslSessionCerts = NULL;
+
typedef struct _sslsockdata
{
SSL_CTX *ctx;
sslsockdata;
/* local prototypes */
-int ssl_init (void);
+static int ssl_init (void);
static int add_entropy (const char *file);
static int ssl_socket_read (CONNECTION* conn, char* buf, size_t len);
static int ssl_socket_write (CONNECTION* conn, const char* buf, size_t len);
static int ssl_socket_open (CONNECTION * conn);
static int ssl_socket_close (CONNECTION * conn);
static int tls_close (CONNECTION* conn);
-static int ssl_check_certificate (sslsockdata * data);
+static int ssl_cache_trusted_cert (X509 *cert);
+static int ssl_check_certificate (CONNECTION *conn, sslsockdata * data);
+static int interactive_check_cert (X509 *cert, int idx, int len);
static void ssl_get_client_cert(sslsockdata *ssldata, CONNECTION *conn);
static int ssl_passwd_cb(char *buf, int size, int rwflag, void *userdata);
-static int ssl_negotiate (sslsockdata*);
+static int ssl_negotiate (CONNECTION *conn, sslsockdata*);
/* mutt_ssl_starttls: Negotiate TLS over an already opened connection.
* TODO: Merge this code better with ssl_socket_open. */
goto bail_ssl;
}
- if (ssl_negotiate (ssldata))
+ if (ssl_negotiate (conn, ssldata))
goto bail_ssl;
/* hmm. watch out if we're starting TLS over any method other than raw. */
return -1;
}
-/*
+/*
* OpenSSL library needs to be fed with sufficient entropy. On systems
* with /dev/urandom, this is done transparently by the library itself,
* on other systems we need to fill the entropy pool ourselves.
* versions also. (That's the reason for the ugly #ifdefs and macros,
* otherwise I could have simply #ifdef'd the whole ssl_init funcion)
*/
-int ssl_init (void)
+static int ssl_init (void)
{
char path[_POSIX_PATH_MAX];
static unsigned char init_complete = 0;
/* load entropy from files */
add_entropy (SslEntropyFile);
add_entropy (RAND_file_name (path, sizeof (path)));
-
+
/* load entropy from egd sockets */
#ifdef HAVE_RAND_EGD
add_entropy (getenv ("EGDSOCKET"));
mutt_message (_("Filling entropy pool: %s...\n"),
file);
-
+
/* check that the file permissions are secure */
- if (st.st_uid != getuid () ||
+ if (st.st_uid != getuid () ||
((st.st_mode & (S_IWGRP | S_IRGRP)) != 0) ||
((st.st_mode & (S_IWOTH | S_IROTH)) != 0))
{
data->ctx = SSL_CTX_new (SSLv23_client_method ());
/* disable SSL protocols as needed */
- if (!option(OPTTLSV1))
+ if (!option(OPTTLSV1))
{
SSL_CTX_set_options(data->ctx, SSL_OP_NO_TLSv1);
}
- if (!option(OPTSSLV2))
+ if (!option(OPTSSLV2))
{
SSL_CTX_set_options(data->ctx, SSL_OP_NO_SSLv2);
}
- if (!option(OPTSSLV3))
+ if (!option(OPTSSLV3))
{
SSL_CTX_set_options(data->ctx, SSL_OP_NO_SSLv3);
}
data->ssl = SSL_new (data->ctx);
SSL_set_fd (data->ssl, conn->fd);
- if (ssl_negotiate(data))
+ if (ssl_negotiate(conn, data))
{
mutt_socket_close (conn);
return -1;
}
-
+
conn->ssf = SSL_CIPHER_get_bits (SSL_get_current_cipher (data->ssl),
&maxbits);
/* ssl_negotiate: After SSL state has been initialised, attempt to negotiate
* SSL over the wire, including certificate checks. */
-static int ssl_negotiate (sslsockdata* ssldata)
+static int ssl_negotiate (CONNECTION *conn, sslsockdata* ssldata)
{
int err;
const char* errmsg;
default:
errmsg = _("unknown error");
}
-
+
mutt_error (_("SSL failed: %s"), errmsg);
mutt_sleep (1);
return -1;
}
- if (!ssl_check_certificate (ssldata))
+ if (!ssl_check_certificate (conn, ssldata))
return -1;
- mutt_message (_("SSL connection using %s (%s)"),
+ mutt_message (_("SSL connection using %s (%s)"),
SSL_get_cipher_version (ssldata->ssl), SSL_get_cipher_name (ssldata->ssl));
mutt_sleep (0);
BIO *bio;
strfcpy (buf, _("[invalid date]"), sizeof (buf));
-
+
bio = BIO_new (BIO_s_mem());
if (bio)
{
{
X509_STORE_CTX xsc;
X509_STORE *ctx;
- int pass = 0;
+ int pass = 0, i;
ctx = X509_STORE_new ();
if (ctx == NULL) return 0;
else
dprint (2, (debugfile, "X509_STORE_load_locations_failed\n"));
+ for (i = 0; i < sk_X509_num (SslSessionCerts); i++)
+ pass += (X509_STORE_add_cert (ctx, sk_X509_value (SslSessionCerts, i)) != 0);
+
if (pass == 0)
{
/* nothing to do */
return 0;
}
- X509_STORE_CTX_init (&xsc, ctx, peercert, NULL);
+ X509_STORE_CTX_init (&xsc, ctx, peercert, SslSessionCerts);
pass = (X509_verify_cert (&xsc) > 0);
#ifdef DEBUG
int err;
err = X509_STORE_CTX_get_error (&xsc);
- snprintf (buf, sizeof (buf), "%s (%d)",
+ snprintf (buf, sizeof (buf), "%s (%d)",
X509_verify_cert_error_string(err), err);
dprint (2, (debugfile, "X509_verify_cert: %s\n", buf));
+ dprint (2, (debugfile, " [%s]\n", peercert->name));
}
#endif
X509_STORE_CTX_cleanup (&xsc);
{
unsigned char md[EVP_MAX_MD_SIZE];
unsigned int mdlen;
-
+
/* Avoid CPU-intensive digest calculation if the certificates are
* not even remotely equal.
*/
if (X509_subject_name_cmp (cert, peercert) != 0 ||
X509_issuer_name_cmp (cert, peercert) != 0)
return -1;
-
+
if (!X509_digest (cert, EVP_sha1(), md, &mdlen) || peermdlen != mdlen)
return -1;
-
+
if (memcmp(peermd, md, mdlen) != 0)
return -1;
unsigned char peermd[EVP_MAX_MD_SIZE];
unsigned int peermdlen;
X509 *cert;
- LIST *scert;
+ int i;
- if (!X509_digest (peercert, EVP_sha1(), peermd, &peermdlen))
+ if (!X509_digest (peercert, EVP_sha1(), peermd, &peermdlen)
+ || !SslSessionCerts)
{
return 0;
}
-
- for (scert = SslSessionCerts; scert; scert = scert->next)
+
+ for (i = sk_X509_num (SslSessionCerts); i-- > 0;)
{
- cert = *(X509**)scert->data;
+ cert = sk_X509_value (SslSessionCerts, i);
if (!compare_certificates (cert, peercert, peermd, peermdlen))
{
return 1;
}
}
-
+
return 0;
}
FILE *fp;
/* expiration check */
- if (X509_cmp_current_time (X509_get_notBefore (peercert)) >= 0)
- {
- dprint (2, (debugfile, "Server certificate is not yet valid\n"));
- mutt_error (_("Server certificate is not yet valid"));
- mutt_sleep (2);
- return 0;
- }
- if (X509_cmp_current_time (X509_get_notAfter (peercert)) <= 0)
+ if (option (OPTSSLVERIFYDATES) != M_NO)
{
- dprint (2, (debugfile, "Server certificate has expired"));
- mutt_error (_("Server certificate has expired"));
- mutt_sleep (2);
- return 0;
+ if (X509_cmp_current_time (X509_get_notBefore (peercert)) >= 0)
+ {
+ dprint (2, (debugfile, "Server certificate is not yet valid\n"));
+ mutt_error (_("Server certificate is not yet valid"));
+ mutt_sleep (2);
+ return 0;
+ }
+ if (X509_cmp_current_time (X509_get_notAfter (peercert)) <= 0)
+ {
+ dprint (2, (debugfile, "Server certificate has expired"));
+ mutt_error (_("Server certificate has expired"));
+ mutt_sleep (2);
+ return 0;
+ }
}
if ((fp = fopen (SslCertFile, "rt")) == NULL)
if (!X509_digest (peercert, EVP_sha1(), peermd, &peermdlen))
{
- fclose (fp);
+ safe_fclose (&fp);
return 0;
}
while ((cert = READ_X509_KEY (fp, &cert)) != NULL)
{
pass = compare_certificates (cert, peercert, peermd, peermdlen) ? 0 : 1;
-
+
if (pass)
break;
}
X509_free (cert);
- fclose (fp);
+ safe_fclose (&fp);
return pass;
}
-static int ssl_check_certificate (sslsockdata * data)
+/* port to mutt from msmtp's tls.c */
+static int hostname_match (const char *hostname, const char *certname)
+{
+ const char *cmp1, *cmp2;
+
+ if (strncmp(certname, "*.", 2) == 0)
+ {
+ cmp1 = certname + 2;
+ cmp2 = strchr(hostname, '.');
+ if (!cmp2)
+ {
+ return 0;
+ }
+ else
+ {
+ cmp2++;
+ }
+ }
+ else
+ {
+ cmp1 = certname;
+ cmp2 = hostname;
+ }
+
+ if (*cmp1 == '\0' || *cmp2 == '\0')
+ {
+ return 0;
+ }
+
+ if (strcasecmp(cmp1, cmp2) != 0)
+ {
+ return 0;
+ }
+
+ return 1;
+}
+
+/* port to mutt from msmtp's tls.c */
+static int check_host (X509 *x509cert, const char *hostname, char *err, size_t errlen)
+{
+ int i, rc = 0;
+ /* hostname in ASCII format: */
+ char *hostname_ascii = NULL;
+ /* needed to get the common name: */
+ X509_NAME *x509_subject;
+ char *buf = NULL;
+ int bufsize;
+ /* needed to get the DNS subjectAltNames: */
+ STACK *subj_alt_names;
+ int subj_alt_names_count;
+ GENERAL_NAME *subj_alt_name;
+ /* did we find a name matching hostname? */
+ int match_found;
+
+ /* Check if 'hostname' matches the one of the subjectAltName extensions of
+ * type DNS or the Common Name (CN). */
+
+#ifdef HAVE_LIBIDN
+ if (idna_to_ascii_lz(hostname, &hostname_ascii, 0) != IDNA_SUCCESS)
+ {
+ hostname_ascii = safe_strdup(hostname);
+ }
+#else
+ hostname_ascii = safe_strdup(hostname);
+#endif
+
+ /* Try the DNS subjectAltNames. */
+ match_found = 0;
+ if ((subj_alt_names = X509_get_ext_d2i(x509cert, NID_subject_alt_name,
+ NULL, NULL)))
+ {
+ subj_alt_names_count = sk_GENERAL_NAME_num(subj_alt_names);
+ for (i = 0; i < subj_alt_names_count; i++)
+ {
+ subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
+ if (subj_alt_name->type == GEN_DNS)
+ {
+ if ((match_found = hostname_match(hostname_ascii,
+ (char *)(subj_alt_name->d.ia5->data))))
+ {
+ break;
+ }
+ }
+ }
+ }
+
+ if (!match_found)
+ {
+ /* Try the common name */
+ if (!(x509_subject = X509_get_subject_name(x509cert)))
+ {
+ if (err && errlen)
+ strfcpy (err, _("cannot get certificate subject"), errlen);
+ goto out;
+ }
+
+ bufsize = X509_NAME_get_text_by_NID(x509_subject, NID_commonName,
+ NULL, 0);
+ bufsize++;
+ buf = safe_malloc((size_t)bufsize);
+ if (X509_NAME_get_text_by_NID(x509_subject, NID_commonName,
+ buf, bufsize) == -1)
+ {
+ if (err && errlen)
+ strfcpy (err, _("cannot get certificate common name"), errlen);
+ goto out;
+ }
+ match_found = hostname_match(hostname_ascii, buf);
+ }
+
+ if (!match_found)
+ {
+ if (err && errlen)
+ snprintf (err, errlen, _("certificate owner does not match hostname %s"),
+ hostname);
+ goto out;
+ }
+
+ rc = 1;
+
+out:
+ FREE(&buf);
+ FREE(&hostname_ascii);
+
+ return rc;
+}
+
+static int ssl_cache_trusted_cert (X509 *c)
+{
+ dprint (1, (debugfile, "trusted: %s\n", c->name));
+ if (!SslSessionCerts)
+ SslSessionCerts = sk_new_null();
+ return (sk_X509_push (SslSessionCerts, X509_dup(c)));
+}
+
+/* check whether cert is preauthorized. If host is not null, verify that
+ * it matches the certificate.
+ * Return > 0: authorized, < 0: problems, 0: unknown validity */
+static int ssl_check_preauth (X509 *cert, const char* host)
{
- char *part[] =
- {"/CN=", "/Email=", "/O=", "/OU=", "/L=", "/ST=", "/C="};
- char helpstr[LONG_STRING];
char buf[SHORT_STRING];
- MUTTMENU *menu;
- int done, row, i;
- FILE *fp;
- char *name = NULL, *c;
/* check session cache first */
- if (check_certificate_cache (data->cert))
+ if (check_certificate_cache (cert))
{
- dprint (1, (debugfile, "ssl_check_certificate: using cached certificate\n"));
+ dprint (2, (debugfile, "ssl_check_preauth: using cached certificate\n"));
return 1;
}
- if (check_certificate_by_signer (data->cert))
+ buf[0] = 0;
+ if (host && option (OPTSSLVERIFYHOST) != M_NO)
{
- dprint (1, (debugfile, "ssl_check_certificate: signer check passed\n"));
+ if (!check_host (cert, host, buf, sizeof (buf)))
+ {
+ mutt_error (_("Certificate host check failed: %s"), buf);
+ mutt_sleep (2);
+ return -1;
+ }
+ dprint (2, (debugfile, "ssl_check_preauth: hostname check passed\n"));
+ }
+
+ if (check_certificate_by_signer (cert))
+ {
+ dprint (2, (debugfile, "ssl_check_preauth: signer check passed\n"));
return 1;
}
/* automatic check from user's database */
- if (SslCertFile && check_certificate_by_digest (data->cert))
+ if (SslCertFile && check_certificate_by_digest (cert))
{
- dprint (1, (debugfile, "ssl_check_certificate: digest check passed\n"));
+ dprint (2, (debugfile, "ssl_check_preauth: digest check passed\n"));
return 1;
}
- /* interactive check from user */
- menu = mutt_new_menu ();
+ return 0;
+}
+
+static int ssl_check_certificate (CONNECTION *conn, sslsockdata *data)
+{
+ int i, preauthrc, chain_len;
+ STACK_OF(X509) *chain;
+ X509 *cert;
+
+ if ((preauthrc = ssl_check_preauth (data->cert, conn->account.host)) > 0)
+ return preauthrc;
+
+ chain = SSL_get_peer_cert_chain (data->ssl);
+ chain_len = sk_X509_num (chain);
+ /* negative preauthrc means the certificate won't be accepted without
+ * manual override. */
+ if (preauthrc < 0 || !chain || (chain_len <= 1))
+ return interactive_check_cert (data->cert, 0, 0);
+
+ /* check the chain from root to peer. */
+ for (i = chain_len-1; i >= 0; i--)
+ {
+ cert = sk_X509_value (chain, i);
+
+ /* if the certificate validates or is manually accepted, then add it to
+ * the trusted set and recheck the peer certificate */
+ if (ssl_check_preauth (cert, NULL)
+ || interactive_check_cert (cert, i, chain_len))
+ {
+ ssl_cache_trusted_cert (cert);
+ if (ssl_check_preauth (data->cert, conn->account.host))
+ return 1;
+ }
+ }
+
+ return 0;
+}
+
+static int interactive_check_cert (X509 *cert, int idx, int len)
+{
+ char *part[] =
+ {"/CN=", "/Email=", "/O=", "/OU=", "/L=", "/ST=", "/C="};
+ char helpstr[LONG_STRING];
+ char buf[STRING];
+ char title[STRING];
+ MUTTMENU *menu = mutt_new_menu (-1);
+ int done, row, i;
+ FILE *fp;
+ char *name = NULL, *c;
+
+ dprint (2, (debugfile, "interactive_check_cert: %s\n", cert->name));
+
menu->max = 19;
menu->dialog = (char **) safe_calloc (1, menu->max * sizeof (char *));
for (i = 0; i < menu->max; i++)
row = 0;
strfcpy (menu->dialog[row], _("This certificate belongs to:"), SHORT_STRING);
row++;
- name = X509_NAME_oneline (X509_get_subject_name (data->cert),
+ name = X509_NAME_oneline (X509_get_subject_name (cert),
buf, sizeof (buf));
+ dprint (2, (debugfile, "oneline: %s\n", name));
+
for (i = 0; i < 5; i++)
{
c = x509_get_part (name, part[i]);
row++;
strfcpy (menu->dialog[row], _("This certificate was issued by:"), SHORT_STRING);
row++;
- name = X509_NAME_oneline (X509_get_issuer_name (data->cert),
+ name = X509_NAME_oneline (X509_get_issuer_name (cert),
buf, sizeof (buf));
for (i = 0; i < 5; i++)
{
row++;
snprintf (menu->dialog[row++], SHORT_STRING, _("This certificate is valid"));
- snprintf (menu->dialog[row++], SHORT_STRING, _(" from %s"),
- asn1time_to_string (X509_get_notBefore (data->cert)));
- snprintf (menu->dialog[row++], SHORT_STRING, _(" to %s"),
- asn1time_to_string (X509_get_notAfter (data->cert)));
+ snprintf (menu->dialog[row++], SHORT_STRING, _(" from %s"),
+ asn1time_to_string (X509_get_notBefore (cert)));
+ snprintf (menu->dialog[row++], SHORT_STRING, _(" to %s"),
+ asn1time_to_string (X509_get_notAfter (cert)));
row++;
buf[0] = '\0';
- x509_fingerprint (buf, sizeof (buf), data->cert);
+ x509_fingerprint (buf, sizeof (buf), cert);
snprintf (menu->dialog[row++], SHORT_STRING, _("Fingerprint: %s"), buf);
- menu->title = _("SSL Certificate check");
- if (SslCertFile && X509_cmp_current_time (X509_get_notAfter (data->cert)) >= 0
- && X509_cmp_current_time (X509_get_notBefore (data->cert)) < 0)
+ snprintf (title, sizeof (title),
+ _("SSL Certificate check (certificate %d of %d in chain)"),
+ len - idx, len);
+ menu->title = title;
+ if (SslCertFile
+ && (option (OPTSSLVERIFYDATES) == M_NO
+ || (X509_cmp_current_time (X509_get_notAfter (cert)) >= 0
+ && X509_cmp_current_time (X509_get_notBefore (cert)) < 0)))
{
menu->prompt = _("(r)eject, accept (o)nce, (a)ccept always");
menu->keys = _("roa");
menu->prompt = _("(r)eject, accept (o)nce");
menu->keys = _("ro");
}
-
+
helpstr[0] = '\0';
mutt_make_help (buf, sizeof (buf), _("Exit "), MENU_GENERIC, OP_EXIT);
safe_strcat (helpstr, sizeof (helpstr), buf);
done = 0;
if ((fp = fopen (SslCertFile, "a")))
{
- if (PEM_write_X509 (fp, data->cert))
+ if (PEM_write_X509 (fp, cert))
done = 1;
- fclose (fp);
+ safe_fclose (&fp);
}
if (!done)
{
/* fall through */
case OP_MAX + 2: /* accept once */
done = 2;
- /* keep a handle on accepted certificates in case we want to
- * open up another connection to the same server in this session */
- SslSessionCerts = mutt_add_list_n (SslSessionCerts, &data->cert,
- sizeof (X509 **));
+ ssl_cache_trusted_cert (cert);
break;
}
}
unset_option(OPTUNBUFFEREDINPUT);
mutt_menuDestroy (&menu);
+ dprint (2, (debugfile, "ssl interactive_check_cert: done=%d\n", done));
return (done == 2);
}
SSL_CTX_set_default_passwd_cb(ssldata->ctx, ssl_passwd_cb);
SSL_CTX_use_certificate_file(ssldata->ctx, SslClientCert, SSL_FILETYPE_PEM);
SSL_CTX_use_PrivateKey_file(ssldata->ctx, SslClientCert, SSL_FILETYPE_PEM);
+
+ /* if we are using a client cert, SASL may expect an external auth name */
+ mutt_account_getuser (&conn->account);
}
}
dprint (2, (debugfile, "ssl_passwd_cb: getting password for %s@%s:%u\n",
account->user, account->host, account->port));
-
+
if (mutt_account_getpass (account))
return 0;
projects / software / mutt-debian.git / blobdiff