resolved: basic OpenSSL support for DNS-over-TLS
This provides basic OpenSSL support without optimizations like TCP Fast Open and TLS Session Tickets. Notice only a single SSL library can be enabled at a time and therefore journald functions provided by GnuTLS will be disabled when using OpenSSL. Fixes #9531
This commit is contained in:
parent
ba6aaf5727
commit
096cbdce13
3
README
3
README
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@ -154,7 +154,8 @@ REQUIREMENTS:
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libmicrohttpd (optional)
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libmicrohttpd (optional)
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libpython (optional)
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libpython (optional)
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libidn2 or libidn (optional)
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libidn2 or libidn (optional)
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gnutls >= 3.1.4 (optional, >= 3.5.3 is necessary to support DNS-over-TLS)
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gnutls >= 3.1.4 (optional, >= 3.5.3 is required to support DNS-over-TLS with gnutls)
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openssl >= 1.1.0 (optional, required to support DNS-over-TLS with openssl)
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elfutils >= 158 (optional)
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elfutils >= 158 (optional)
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polkit (optional)
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polkit (optional)
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pkg-config
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pkg-config
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41
meson.build
41
meson.build
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@ -1013,6 +1013,18 @@ else
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endif
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endif
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conf.set10('HAVE_GNUTLS', have)
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conf.set10('HAVE_GNUTLS', have)
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want_openssl = get_option('openssl')
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if want_openssl != 'false' and not fuzzer_build
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libopenssl = dependency('openssl',
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version : '>= 1.1.0',
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required : want_openssl == 'true')
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have = libopenssl.found()
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else
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have = false
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libopenssl = []
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endif
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conf.set10('HAVE_OPENSSL', have)
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want_elfutils = get_option('elfutils')
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want_elfutils = get_option('elfutils')
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if want_elfutils != 'false' and not fuzzer_build
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if want_elfutils != 'false' and not fuzzer_build
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libdw = dependency('libdw',
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libdw = dependency('libdw',
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@ -1136,15 +1148,30 @@ substs.set('DEFAULT_DNSSEC_MODE', default_dnssec)
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dns_over_tls = get_option('dns-over-tls')
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dns_over_tls = get_option('dns-over-tls')
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if dns_over_tls != 'false'
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if dns_over_tls != 'false'
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have = (conf.get('HAVE_GNUTLS') == 1 and
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if dns_over_tls == 'openssl'
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libgnutls.version().version_compare('>=3.5.3'))
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have_gnutls = false
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if dns_over_tls == 'true' and not have
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else
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error('DNS-over-TLS support was requested, but dependencies are not available')
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have_gnutls = (conf.get('HAVE_GNUTLS') == 1 and libgnutls.version().version_compare('>= 3.5.3'))
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if dns_over_tls == 'gnutls' and not have_gnutls
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error('DNS-over-TLS support was requested with gnutls, but dependencies are not available')
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endif
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endif
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endif
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if dns_over_tls == 'gnutls' or have_gnutls
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have_openssl = false
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else
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have_openssl = conf.get('HAVE_OPENSSL') == 1
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if dns_over_tls != 'auto' and not have_openssl
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str = dns_over_tls == 'openssl' ? ' with openssl' : ''
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error('DNS-over-TLS support was requested$0$, but dependencies are not available'.format(str))
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endif
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endif
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have = have_gnutls or have_openssl
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else
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else
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have = false
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have = have_gnutls = have_openssl = false
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endif
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endif
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conf.set10('ENABLE_DNS_OVER_TLS', have)
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conf.set10('ENABLE_DNS_OVER_TLS', have)
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conf.set10('DNS_OVER_TLS_USE_GNUTLS', have_gnutls)
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conf.set10('DNS_OVER_TLS_USE_OPENSSL', have_openssl)
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default_dns_over_tls = get_option('default-dns-over-tls')
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default_dns_over_tls = get_option('default-dns-over-tls')
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if fuzzer_build
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if fuzzer_build
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@ -2950,6 +2977,7 @@ foreach tuple : [
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['qrencode'],
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['qrencode'],
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['microhttpd'],
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['microhttpd'],
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['gnutls'],
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['gnutls'],
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['openssl'],
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['libcurl'],
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['libcurl'],
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['idn'],
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['idn'],
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['libidn2'],
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['libidn2'],
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@ -2976,7 +3004,8 @@ foreach tuple : [
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['localed'],
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['localed'],
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['networkd'],
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['networkd'],
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['resolve'],
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['resolve'],
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['DNS-over-TLS'],
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['DNS-over-TLS(gnutls)', conf.get('DNS_OVER_TLS_USE_GNUTLS') == 1],
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['DNS-over-TLS(openssl)', conf.get('DNS_OVER_TLS_USE_OPENSSL') == 1],
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['coredump'],
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['coredump'],
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['polkit'],
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['polkit'],
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['legacy pkla', install_polkit_pkla],
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['legacy pkla', install_polkit_pkla],
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@ -195,7 +195,7 @@ option('default-dns-over-tls', type : 'combo',
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description : 'default DNS-over-TLS mode',
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description : 'default DNS-over-TLS mode',
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choices : ['opportunistic', 'no'],
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choices : ['opportunistic', 'no'],
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value : 'no')
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value : 'no')
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option('dns-over-tls', type : 'combo', choices : ['auto', 'true', 'false'],
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option('dns-over-tls', type : 'combo', choices : ['auto', 'gnutls', 'openssl', 'true', 'false'],
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description : 'DNS-over-TLS support')
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description : 'DNS-over-TLS support')
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option('dns-servers', type : 'string',
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option('dns-servers', type : 'string',
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description : 'space-separated list of default DNS servers',
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description : 'space-separated list of default DNS servers',
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@ -255,6 +255,8 @@ option('gcrypt', type : 'combo', choices : ['auto', 'true', 'false'],
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description : 'gcrypt support')
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description : 'gcrypt support')
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option('gnutls', type : 'combo', choices : ['auto', 'true', 'false'],
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option('gnutls', type : 'combo', choices : ['auto', 'true', 'false'],
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description : 'gnutls support')
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description : 'gnutls support')
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option('openssl', type : 'combo', choices : ['auto', 'true', 'false'],
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description : 'openssl support')
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option('elfutils', type : 'combo', choices : ['auto', 'true', 'false'],
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option('elfutils', type : 'combo', choices : ['auto', 'true', 'false'],
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description : 'elfutils support')
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description : 'elfutils support')
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option('zlib', type : 'combo', choices : ['auto', 'true', 'false'],
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option('zlib', type : 'combo', choices : ['auto', 'true', 'false'],
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@ -142,8 +142,15 @@ systemd_resolved_sources += [resolved_gperf_c, resolved_dnssd_gperf_c]
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systemd_resolved_dependencies = [threads, libgpg_error, libm, libidn]
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systemd_resolved_dependencies = [threads, libgpg_error, libm, libidn]
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if conf.get('ENABLE_DNS_OVER_TLS') == 1
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if conf.get('ENABLE_DNS_OVER_TLS') == 1
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systemd_resolved_sources += [files(['resolved-dnstls-gnutls.c', 'resolved-dnstls-gnutls.h'])]
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if conf.get('DNS_OVER_TLS_USE_GNUTLS') == 1
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systemd_resolved_dependencies += [libgnutls]
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systemd_resolved_sources += [files(['resolved-dnstls-gnutls.c', 'resolved-dnstls-gnutls.h'])]
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systemd_resolved_dependencies += [libgnutls]
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elif conf.get('DNS_OVER_TLS_USE_OPENSSL') == 1
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systemd_resolved_sources += [files(['resolved-dnstls-openssl.c', 'resolved-dnstls-openssl.h'])]
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systemd_resolved_dependencies += [libopenssl]
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else
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error('unknown dependency for supporting DNS-over-TLS')
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endif
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endif
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endif
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if conf.get('ENABLE_RESOLVE') == 1
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if conf.get('ENABLE_RESOLVE') == 1
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@ -234,6 +234,8 @@ ssize_t dns_stream_writev(DnsStream *s, const struct iovec *iov, size_t iovcnt,
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r = -EAGAIN;
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r = -EAGAIN;
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} else if (errno == EINPROGRESS)
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} else if (errno == EINPROGRESS)
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r = -EAGAIN;
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r = -EAGAIN;
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else
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r = -errno;
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} else
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} else
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s->tfo_salen = 0; /* connection is made */
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s->tfo_salen = 0; /* connection is made */
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} else {
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} else {
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@ -1,6 +1,6 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#if !ENABLE_DNS_OVER_TLS || !HAVE_GNUTLS
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#if !ENABLE_DNS_OVER_TLS || !DNS_OVER_TLS_USE_GNUTLS
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#error This source file requires DNS-over-TLS to be enabled and GnuTLS to be available.
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#error This source file requires DNS-over-TLS to be enabled and GnuTLS to be available.
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#endif
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#endif
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@ -1,7 +1,7 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#pragma once
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#pragma once
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#if !ENABLE_DNS_OVER_TLS || !HAVE_GNUTLS
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#if !ENABLE_DNS_OVER_TLS || !DNS_OVER_TLS_USE_GNUTLS
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#error This source file requires DNS-over-TLS to be enabled and GnuTLS to be available.
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#error This source file requires DNS-over-TLS to be enabled and GnuTLS to be available.
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#endif
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#endif
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@ -0,0 +1,216 @@
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/* SPDX-License-Identifier: LGPL-2.1+ */
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#if !ENABLE_DNS_OVER_TLS || !DNS_OVER_TLS_USE_OPENSSL
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#error This source file requires DNS-over-TLS to be enabled and OpenSSL to be available.
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#endif
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#include "resolved-dnstls.h"
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#include "resolved-dns-stream.h"
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#include <openssl/bio.h>
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#include <openssl/err.h>
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DEFINE_TRIVIAL_CLEANUP_FUNC(SSL*, SSL_free);
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DEFINE_TRIVIAL_CLEANUP_FUNC(BIO*, BIO_free);
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int dnstls_stream_connect_tls(DnsStream *stream, DnsServer *server) {
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_cleanup_(SSL_freep) SSL *s = NULL;
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_cleanup_(BIO_freep) BIO *b = NULL;
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assert(stream);
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assert(server);
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b = BIO_new_socket(stream->fd, 0);
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if (!b)
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return -ENOMEM;
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s = SSL_new(server->dnstls_data.ctx);
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if (!s)
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return -ENOMEM;
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SSL_set_connect_state(s);
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SSL_set_bio(s, b, b);
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b = NULL;
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/* DNS-over-TLS using OpenSSL doesn't support TCP Fast Open yet */
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connect(stream->fd, &stream->tfo_address.sa, stream->tfo_salen);
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stream->tfo_salen = 0;
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stream->encrypted = true;
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stream->dnstls_events = EPOLLOUT;
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stream->dnstls_data.ssl = TAKE_PTR(s);
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return 0;
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}
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void dnstls_stream_free(DnsStream *stream) {
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assert(stream);
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assert(stream->encrypted);
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if (stream->dnstls_data.ssl)
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SSL_free(stream->dnstls_data.ssl);
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}
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int dnstls_stream_on_io(DnsStream *stream) {
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int r;
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int error;
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assert(stream);
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assert(stream->encrypted);
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assert(stream->dnstls_data.ssl);
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if (stream->dnstls_data.shutdown) {
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r = SSL_shutdown(stream->dnstls_data.ssl);
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if (r == 0)
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return -EAGAIN;
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else if (r < 0) {
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error = SSL_get_error(stream->dnstls_data.ssl, r);
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if (IN_SET(error, SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE)) {
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stream->dnstls_events = error == SSL_ERROR_WANT_READ ? EPOLLIN : EPOLLOUT;
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return -EAGAIN;
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} else {
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char errbuf[256];
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ERR_error_string_n(error, errbuf, sizeof(errbuf));
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log_debug("Failed to invoke SSL_shutdown: %s", errbuf);
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}
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}
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stream->dnstls_events = 0;
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stream->dnstls_data.shutdown = false;
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dns_stream_unref(stream);
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return DNSTLS_STREAM_CLOSED;
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} else if (stream->dnstls_data.handshake <= 0) {
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stream->dnstls_data.handshake = SSL_do_handshake(stream->dnstls_data.ssl);
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if (stream->dnstls_data.handshake <= 0) {
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error = SSL_get_error(stream->dnstls_data.ssl, stream->dnstls_data.handshake);
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if (IN_SET(error, SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE)) {
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stream->dnstls_events = error == SSL_ERROR_WANT_READ ? EPOLLIN : EPOLLOUT;
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return -EAGAIN;
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} else {
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char errbuf[256];
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ERR_error_string_n(error, errbuf, sizeof(errbuf));
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log_debug("Failed to invoke SSL_do_handshake: %s", errbuf);
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return -ECONNREFUSED;
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}
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}
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stream->dnstls_events = 0;
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}
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return 0;
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}
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int dnstls_stream_shutdown(DnsStream *stream, int error) {
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int r;
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int ssl_error;
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SSL_SESSION *s;
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assert(stream);
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assert(stream->encrypted);
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assert(stream->dnstls_data.ssl);
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if (error == ETIMEDOUT) {
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r = SSL_shutdown(stream->dnstls_data.ssl);
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if (r == 0) {
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if (!stream->dnstls_data.shutdown) {
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stream->dnstls_data.shutdown = true;
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dns_stream_ref(stream);
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}
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return -EAGAIN;
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} else if (r < 0) {
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ssl_error = SSL_get_error(stream->dnstls_data.ssl, r);
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if (IN_SET(ssl_error, SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE)) {
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stream->dnstls_events = ssl_error == SSL_ERROR_WANT_READ ? EPOLLIN : EPOLLOUT;
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if (!stream->dnstls_data.shutdown) {
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stream->dnstls_data.shutdown = true;
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dns_stream_ref(stream);
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}
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return -EAGAIN;
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} else {
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char errbuf[256];
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ERR_error_string_n(ssl_error, errbuf, sizeof(errbuf));
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log_debug("Failed to invoke SSL_shutdown: %s", errbuf);
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}
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}
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}
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return 0;
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}
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ssize_t dnstls_stream_write(DnsStream *stream, const char *buf, size_t count) {
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int r;
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int error;
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ssize_t ss;
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assert(stream);
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assert(stream->encrypted);
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assert(stream->dnstls_data.ssl);
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assert(buf);
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ss = r = SSL_write(stream->dnstls_data.ssl, buf, count);
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if (r <= 0) {
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error = SSL_get_error(stream->dnstls_data.ssl, ss);
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if (IN_SET(error, SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE)) {
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stream->dnstls_events = error == SSL_ERROR_WANT_READ ? EPOLLIN : EPOLLOUT;
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ss = -EAGAIN;
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} else {
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char errbuf[256];
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ERR_error_string_n(error, errbuf, sizeof(errbuf));
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log_debug("Failed to invoke SSL_read: %s", errbuf);
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ss = -EPIPE;
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}
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}
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stream->dnstls_events = 0;
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return ss;
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}
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ssize_t dnstls_stream_read(DnsStream *stream, void *buf, size_t count) {
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int r;
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int error;
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ssize_t ss;
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assert(stream);
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assert(stream->encrypted);
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assert(stream->dnstls_data.ssl);
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||||||
|
assert(buf);
|
||||||
|
|
||||||
|
ss = r = SSL_read(stream->dnstls_data.ssl, buf, count);
|
||||||
|
if (r <= 0) {
|
||||||
|
error = SSL_get_error(stream->dnstls_data.ssl, ss);
|
||||||
|
if (IN_SET(error, SSL_ERROR_WANT_READ, SSL_ERROR_WANT_WRITE)) {
|
||||||
|
stream->dnstls_events = error == SSL_ERROR_WANT_READ ? EPOLLIN : EPOLLOUT;
|
||||||
|
ss = -EAGAIN;
|
||||||
|
} else {
|
||||||
|
char errbuf[256];
|
||||||
|
|
||||||
|
ERR_error_string_n(error, errbuf, sizeof(errbuf));
|
||||||
|
log_debug("Failed to invoke SSL_read: %s", errbuf);
|
||||||
|
ss = -EPIPE;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
stream->dnstls_events = 0;
|
||||||
|
return ss;
|
||||||
|
}
|
||||||
|
|
||||||
|
void dnstls_server_init(DnsServer *server) {
|
||||||
|
assert(server);
|
||||||
|
|
||||||
|
server->dnstls_data.ctx = SSL_CTX_new(TLS_client_method());
|
||||||
|
if (server->dnstls_data.ctx) {
|
||||||
|
SSL_CTX_set_min_proto_version(server->dnstls_data.ctx, TLS1_2_VERSION);
|
||||||
|
SSL_CTX_set_options(server->dnstls_data.ctx, SSL_OP_NO_COMPRESSION);
|
||||||
|
}
|
||||||
|
}
|
||||||
|
|
||||||
|
void dnstls_server_free(DnsServer *server) {
|
||||||
|
assert(server);
|
||||||
|
|
||||||
|
if (server->dnstls_data.ctx)
|
||||||
|
SSL_CTX_free(server->dnstls_data.ctx);
|
||||||
|
}
|
|
@ -0,0 +1,20 @@
|
||||||
|
/* SPDX-License-Identifier: LGPL-2.1+ */
|
||||||
|
#pragma once
|
||||||
|
|
||||||
|
#if !ENABLE_DNS_OVER_TLS || !DNS_OVER_TLS_USE_OPENSSL
|
||||||
|
#error This source file requires DNS-over-TLS to be enabled and OpenSSL to be available.
|
||||||
|
#endif
|
||||||
|
|
||||||
|
#include <stdbool.h>
|
||||||
|
|
||||||
|
#include <openssl/ssl.h>
|
||||||
|
|
||||||
|
struct DnsTlsServerData {
|
||||||
|
SSL_CTX *ctx;
|
||||||
|
};
|
||||||
|
|
||||||
|
struct DnsTlsStreamData {
|
||||||
|
int handshake;
|
||||||
|
bool shutdown;
|
||||||
|
SSL *ssl;
|
||||||
|
};
|
|
@ -8,8 +8,12 @@
|
||||||
typedef struct DnsTlsServerData DnsTlsServerData;
|
typedef struct DnsTlsServerData DnsTlsServerData;
|
||||||
typedef struct DnsTlsStreamData DnsTlsStreamData;
|
typedef struct DnsTlsStreamData DnsTlsStreamData;
|
||||||
|
|
||||||
#if HAVE_GNUTLS
|
#if DNS_OVER_TLS_USE_GNUTLS
|
||||||
#include "resolved-dnstls-gnutls.h"
|
#include "resolved-dnstls-gnutls.h"
|
||||||
|
#elif DNS_OVER_TLS_USE_OPENSSL
|
||||||
|
#include "resolved-dnstls-openssl.h"
|
||||||
|
#else
|
||||||
|
#error Unknown dependency for supporting DNS-over-TLS
|
||||||
#endif
|
#endif
|
||||||
|
|
||||||
#include "resolved-dns-stream.h"
|
#include "resolved-dns-stream.h"
|
||||||
|
|
Loading…
Reference in New Issue