/mandos/release : revision 256

43

stdout, ferror(), remove() */

44

#include <stdint.h> /* uint16_t, uint32_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

47

strtof(), abort() */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, EXIT_FAILURE,

47

srand(), strtof() */

48

#include <stdbool.h> /* bool, false, true */

49

#include <string.h> /* memset(), strcmp(), strlen(),

50

strerror(), asprintf(), strcpy() */

63

strtoimax() */

64

#include <assert.h> /* assert() */

65

#include <errno.h> /* perror(), errno */

66

#include <time.h> /* nanosleep(), time(), sleep() */

66

#include <time.h> /* nanosleep(), time() */

67

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

68

SIOCSIFFLAGS, if_indextoname(),

69

if_nametoindex(), IF_NAMESIZE */

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

73

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

74

getuid(), getgid(), seteuid(),

75

setgid(), pause() */

74

getuid(), getgid(), setuid(),

75

setgid() */

76

#include <arpa/inet.h> /* inet_pton(), htons */

77

#include <iso646.h> /* not, or, and */

78

#include <argp.h> /* struct argp_option, error_t, struct

80

argp_parse(), ARGP_KEY_ARG,

81

ARGP_KEY_END, ARGP_ERR_UNKNOWN */

82

#include <signal.h> /* sigemptyset(), sigaddset(),

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

83

sigaction(), SIGTERM, sigaction,

84

sig_atomic_t */

87

85

88

86

#ifdef __linux__

89

87

#include <sys/klog.h> /* klogctl() */

127

125

static const char mandos_protocol_version[] = "1";

128

126

const char *argp_program_version = "mandos-client " VERSION;

129

127

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

130

static const char sys_class_net[] = "/sys/class/net";

131

char *connect_to = NULL;

132

128

133

129

/* Used for passing in values through the Avahi callback functions */

134

130

typedef struct {

146

142

.dh_bits = 1024, .priority = "SECURE256"

147

143

":!CTYPE-X.509:+CTYPE-OPENPGP" };

148

144

149

sig_atomic_t quit_now = 0;

150

int signal_received = 0;

151

152

145

/*

153

146

* Make additional room in "buffer" for at least BUFFER_SIZE more

154

147

* bytes. "buffer_capacity" is how much is currently allocated,

171

164

*/

172

165

static bool init_gpgme(const char *seckey,

173

166

const char *pubkey, const char *tempdir){

167

int ret;

174

168

gpgme_error_t rc;

175

169

gpgme_engine_info_t engine_info;

176

170

179

173

* Helper function to insert pub and seckey to the engine keyring.

180

174

*/

181

175

bool import_key(const char *filename){

182

int ret;

183

176

int fd;

184

177

gpgme_data_t pgp_data;

185

178

256

249

return false;

257

250

}

258

251

259

return true;

252

return true;

260

253

}

261

254

262

255

/*

316

309

}

317

310

gpgme_recipient_t recipient;

318

311

recipient = result->recipients;

319

while(recipient != NULL){

320

fprintf(stderr, "Public key algorithm: %s\n",

321

gpgme_pubkey_algo_name(recipient->pubkey_algo));

322

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

323

fprintf(stderr, "Secret key available: %s\n",

324

recipient->status == GPG_ERR_NO_SECKEY

325

? "No" : "Yes");

326

recipient = recipient->next;

312

if(recipient){

313

while(recipient != NULL){

314

fprintf(stderr, "Public key algorithm: %s\n",

315

gpgme_pubkey_algo_name(recipient->pubkey_algo));

316

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

317

fprintf(stderr, "Secret key available: %s\n",

318

recipient->status == GPG_ERR_NO_SECKEY

319

? "No" : "Yes");

320

recipient = recipient->next;

321

}

327

322

}

328

323

}

329

324

}

481

476

static int init_gnutls_session(gnutls_session_t *session){

482

477

int ret;

483

478

/* GnuTLS session creation */

484

do {

485

ret = gnutls_init(session, GNUTLS_SERVER);

486

if(quit_now){

487

return -1;

488

}

489

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

479

ret = gnutls_init(session, GNUTLS_SERVER);

490

480

if(ret != GNUTLS_E_SUCCESS){

491

481

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

492

482

safer_gnutls_strerror(ret));

494

484

495

485

{

496

486

const char *err;

497

do {

498

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

499

if(quit_now){

500

gnutls_deinit(*session);

501

return -1;

502

}

503

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

487

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

504

488

if(ret != GNUTLS_E_SUCCESS){

505

489

fprintf(stderr, "Syntax error at: %s\n", err);

506

490

fprintf(stderr, "GnuTLS error: %s\n",

510

494

}

511

495

}

512

496

513

do {

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

mc.cred);

516

if(quit_now){

517

gnutls_deinit(*session);

518

return -1;

519

}

520

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

521

499

if(ret != GNUTLS_E_SUCCESS){

522

500

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

523

501

safer_gnutls_strerror(ret));

526

504

}

527

505

528

506

/* ignore client certificate if any. */

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

530

509

531

510

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

532

511

541

520

static int start_mandos_communication(const char *ip, uint16_t port,

542

521

AvahiIfIndex if_index,

543

522

int af){

544

int ret, tcp_sd = -1;

523

int ret, tcp_sd;

545

524

ssize_t sret;

546

525

union {

547

526

struct sockaddr_in in;

548

527

struct sockaddr_in6 in6;

549

528

} to;

550

529

char *buffer = NULL;

551

char *decrypted_buffer = NULL;

530

char *decrypted_buffer;

552

531

size_t buffer_length = 0;

553

532

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

554

534

size_t written;

555

int retval = -1;

535

int retval = 0;

556

536

gnutls_session_t session;

557

537

int pf; /* Protocol family */

558

538

559

errno = 0;

560

561

if(quit_now){

562

errno = EINTR;

563

return -1;

564

}

565

566

539

switch(af){

567

540

case AF_INET6:

568

541

pf = PF_INET6;

572

545

break;

573

546

default:

574

547

fprintf(stderr, "Bad address family: %d\n", af);

575

errno = EINVAL;

576

548

return -1;

577

549

}

578

550

588

560

589

561

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

562

if(tcp_sd < 0){

591

int e = errno;

592

563

perror("socket");

593

errno = e;

594

goto mandos_end;

595

}

596

597

if(quit_now){

598

errno = EINTR;

599

goto mandos_end;

564

return -1;

600

565

}

601

566

602

567

memset(&to, 0, sizeof(to));

603

568

if(af == AF_INET6){

604

to.in6.sin6_family = (sa_family_t)af;

569

to.in6.sin6_family = (uint16_t)af;

605

570

ret = inet_pton(af, ip, &to.in6.sin6_addr);

606

571

} else { /* IPv4 */

607

572

to.in.sin_family = (sa_family_t)af;

608

573

ret = inet_pton(af, ip, &to.in.sin_addr);

609

574

}

610

575

if(ret < 0 ){

611

int e = errno;

612

576

perror("inet_pton");

613

errno = e;

614

goto mandos_end;

577

return -1;

615

578

}

616

579

if(ret == 0){

617

int e = errno;

618

580

fprintf(stderr, "Bad address: %s\n", ip);

619

errno = e;

620

goto mandos_end;

581

return -1;

621

582

}

622

583

if(af == AF_INET6){

623

584

to.in6.sin6_port = htons(port); /* Spurious warnings from

630

591

if(if_index == AVAHI_IF_UNSPEC){

631

592

fprintf(stderr, "An IPv6 link-local address is incomplete"

632

593

" without a network interface\n");

633

errno = EINVAL;

634

goto mandos_end;

594

return -1;

635

595

}

636

596

/* Set the network interface number as scope */

637

597

to.in6.sin6_scope_id = (uint32_t)if_index;

642

602

-Wunreachable-code */

643

603

}

644

604

645

if(quit_now){

646

errno = EINTR;

647

goto mandos_end;

648

}

649

650

605

if(debug){

651

606

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

652

607

char interface[IF_NAMESIZE];

679

634

}

680

635

}

681

636

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

687

637

if(af == AF_INET6){

688

638

ret = connect(tcp_sd, &to.in6, sizeof(to));

689

639

} else {

690

640

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

691

641

}

692

642

if(ret < 0){

693

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

698

goto mandos_end;

699

}

700

701

if(quit_now){

702

errno = EINTR;

703

goto mandos_end;

643

perror("connect");

644

return -1;

704

645

}

705

646

706

647

const char *out = mandos_protocol_version;

710

651

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

711

652

out_size - written));

712

653

if(ret == -1){

713

int e = errno;

714

654

perror("write");

715

errno = e;

655

retval = -1;

716

656

goto mandos_end;

717

657

}

718

658

written += (size_t)ret;

726

666

break;

727

667

}

728

668

}

729

730

if(quit_now){

731

errno = EINTR;

732

goto mandos_end;

733

}

734

669

}

735

670

736

671

if(debug){

737

672

fprintf(stderr, "Establishing TLS session with %s\n", ip);

738

673

}

739

674

740

if(quit_now){

741

errno = EINTR;

742

goto mandos_end;

743

}

744

745

675

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

676

747

if(quit_now){

748

errno = EINTR;

749

goto mandos_end;

750

}

751

752

do {

677

do{

753

678

ret = gnutls_handshake(session);

754

if(quit_now){

755

errno = EINTR;

756

goto mandos_end;

757

}

758

679

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

759

680

760

681

if(ret != GNUTLS_E_SUCCESS){

762

683

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

763

684

gnutls_perror(ret);

764

685

}

765

errno = EPROTO;

686

retval = -1;

766

687

goto mandos_end;

767

688

}

768

689

774

695

}

775

696

776

697

while(true){

777

778

if(quit_now){

779

errno = EINTR;

780

goto mandos_end;

781

}

782

783

698

buffer_capacity = incbuffer(&buffer, buffer_length,

784

699

buffer_capacity);

785

700

if(buffer_capacity == 0){

786

int e = errno;

787

701

perror("incbuffer");

788

errno = e;

789

goto mandos_end;

790

}

791

792

if(quit_now){

793

errno = EINTR;

702

retval = -1;

794

703

goto mandos_end;

795

704

}

796

705

805

714

case GNUTLS_E_AGAIN:

806

715

break;

807

716

case GNUTLS_E_REHANDSHAKE:

808

do {

717

do{

809

718

ret = gnutls_handshake(session);

810

811

if(quit_now){

812

errno = EINTR;

813

goto mandos_end;

814

}

815

719

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

816

720

if(ret < 0){

817

721

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

818

722

gnutls_perror(ret);

819

errno = EPROTO;

723

retval = -1;

820

724

goto mandos_end;

821

725

}

822

726

break;

823

727

default:

824

728

fprintf(stderr, "Unknown error while reading data from"

825

729

" encrypted session with Mandos server\n");

730

retval = -1;

826

731

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

errno = EIO;

828

732

goto mandos_end;

829

733

}

830

734

} else {

836

740

fprintf(stderr, "Closing TLS session\n");

837

741

}

838

742

839

if(quit_now){

840

errno = EINTR;

841

goto mandos_end;

842

}

843

844

do {

845

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

846

if(quit_now){

847

errno = EINTR;

848

goto mandos_end;

849

}

850

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

851

744

852

745

if(buffer_length > 0){

853

ssize_t decrypted_buffer_size;

854

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

855

747

buffer_length,

856

748

&decrypted_buffer);

857

749

if(decrypted_buffer_size >= 0){

858

859

750

written = 0;

860

751

while(written < (size_t) decrypted_buffer_size){

861

if(quit_now){

862

errno = EINTR;

863

goto mandos_end;

864

}

865

866

752

ret = (int)fwrite(decrypted_buffer + written, 1,

867

753

(size_t)decrypted_buffer_size - written,

868

754

stdout);

869

755

if(ret == 0 and ferror(stdout)){

870

int e = errno;

871

756

if(debug){

872

757

fprintf(stderr, "Error writing encrypted data: %s\n",

873

758

strerror(errno));

874

759

}

875

errno = e;

876

goto mandos_end;

760

retval = -1;

761

break;

877

762

}

878

763

written += (size_t)ret;

879

764

}

880

retval = 0;

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

881

768

}

769

} else {

770

retval = -1;

882

771

}

883

772

884

773

/* Shutdown procedure */

885

774

886

775

mandos_end:

887

{

888

int e = errno;

889

free(decrypted_buffer);

890

free(buffer);

891

if(tcp_sd >= 0){

892

ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));

893

}

894

if(ret == -1){

895

if(e == 0){

896

e = errno;

897

}

898

perror("close");

899

}

900

gnutls_deinit(session);

901

if(quit_now){

902

e = EINTR;

903

retval = -1;

904

}

905

errno = e;

776

free(buffer);

777

ret = (int)TEMP_FAILURE_RETRY(close(tcp_sd));

778

if(ret == -1){

779

perror("close");

906

780

}

781

gnutls_deinit(session);

907

782

return retval;

908

783

}

909

784

926

801

/* Called whenever a service has been resolved successfully or

927

802

timed out */

928

803

929

if(quit_now){

930

return;

931

}

932

933

804

switch(event){

934

805

default:

935

806

case AVAHI_RESOLVER_FAILURE:

972

843

/* Called whenever a new services becomes available on the LAN or

973

844

is removed from the LAN */

974

845

975

if(quit_now){

976

return;

977

}

978

979

846

switch(event){

980

847

default:

981

848

case AVAHI_BROWSER_FAILURE:

1010

877

}

1011

878

}

1012

879

880

sig_atomic_t quit_now = 0;

881

1013

882

/* stop main loop after sigterm has been called */

1014

static void handle_sigterm(int sig){

883

static void handle_sigterm(__attribute__((unused)) int sig){

1015

884

if(quit_now){

1016

885

return;

1017

886

}

1018

887

quit_now = 1;

1019

signal_received = sig;

1020

888

int old_errno = errno;

1021

889

if(mc.simple_poll != NULL){

1022

890

avahi_simple_poll_quit(mc.simple_poll);

1024

892

errno = old_errno;

1025

893

}

1026

894

1027

/*

1028

* This function determines if a directory entry in /sys/class/net

1029

* corresponds to an acceptable network device.

1030

* (This function is passed to scandir(3) as a filter function.)

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

if(if_entry->d_name[0] == '.'){

1042

return 0;

1043

}

1044

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1050

/* read line from flags_fd */

1051

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1052

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1053

flagstring[(size_t)to_read] = '\0';

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

tmpmax = strtoimax(flagstring, &tmp, 0);

1078

if(errno != 0 or tmp == flagstring or (*tmp != '\0'

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1081

if(debug){

1082

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1083

flagstring, if_entry->d_name);

1084

}

1085

free(flagstring);

1086

return 0;

1087

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1090

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1092

if(debug){

1093

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1094

if_entry->d_name);

1095

}

1096

return 0;

1097

}

1098

/* Accept point-to-point devices only if connect_to is specified */

1099

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1100

if(debug){

1101

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1102

if_entry->d_name);

1103

}

1104

return 1;

1105

}

1106

/* Otherwise, reject non-broadcast-capable devices */

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

fprintf(stderr, "Rejecting non-broadcast interface \"%s\"\n",

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1114

/* Accept this device */

1115

if(debug){

1116

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1117

if_entry->d_name);

1118

}

1119

return 1;

1120

}

1121

1122

895

int main(int argc, char *argv[]){

1123

896

AvahiSServiceBrowser *sb = NULL;

1124

897

int error;

1126

899

intmax_t tmpmax;

1127

900

char *tmp;

1128

901

int exitcode = EXIT_SUCCESS;

1129

const char *interface = "";

902

const char *interface = "eth0";

1130

903

struct ifreq network;

1131

int sd = -1;

1132

bool take_down_interface = false;

904

int sd;

1133

905

uid_t uid;

1134

906

gid_t gid;

907

char *connect_to = NULL;

1135

908

char tempdir[] = "/tmp/mandosXXXXXX";

1136

909

bool tempdir_created = false;

1137

910

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1142

915

bool gpgme_initialized = false;

1143

916

float delay = 2.5f;

1144

917

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

struct sigaction old_sigterm_action;

1146

919

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1147

920

1148

uid = getuid();

1149

gid = getgid();

1150

1151

/* Lower any group privileges we might have, just to be safe */

1152

errno = 0;

1153

ret = setgid(gid);

1154

if(ret == -1){

1155

perror("setgid");

1156

}

1157

1158

/* Lower user privileges (temporarily) */

1159

errno = 0;

1160

ret = seteuid(uid);

1161

if(ret == -1){

1162

perror("seteuid");

1163

}

1164

1165

if(quit_now){

1166

goto end;

1167

}

1168

1169

921

{

1170

922

struct argp_option options[] = {

1171

923

{ .name = "debug", .key = 128,

1200

952

.arg = "SECONDS",

1201

953

.doc = "Maximum delay to wait for interface startup",

1202

954

.group = 2 },

1203

/*

1204

* These reproduce what we would get without ARGP_NO_HELP

1205

*/

1206

{ .name = "help", .key = '?',

1207

.doc = "Give this help list", .group = -1 },

1208

{ .name = "usage", .key = -3,

1209

.doc = "Give a short usage message", .group = -1 },

1210

{ .name = "version", .key = 'V',

1211

.doc = "Print program version", .group = -1 },

1212

955

{ .name = NULL }

1213

956

};

1214

957

1215

958

error_t parse_opt(int key, char *arg,

1216

959

struct argp_state *state){

1217

errno = 0;

1218

960

switch(key){

1219

961

case 128: /* --debug */

1220

962

debug = true;

1236

978

tmpmax = strtoimax(arg, &tmp, 10);

1237

979

if(errno != 0 or tmp == arg or *tmp != '\0'

1238

980

or tmpmax != (typeof(mc.dh_bits))tmpmax){

1239

argp_error(state, "Bad number of DH bits");

981

fprintf(stderr, "Bad number of DH bits\n");

982

exit(EXIT_FAILURE);

1240

983

}

1241

984

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

1242

985

break;

1247

990

errno = 0;

1248

991

delay = strtof(arg, &tmp);

1249

992

if(errno != 0 or tmp == arg or *tmp != '\0'){

1250

argp_error(state, "Bad delay");

993

fprintf(stderr, "Bad delay\n");

994

exit(EXIT_FAILURE);

1251

995

}

1252

996

break;

1253

/*

1254

* These reproduce what we would get without ARGP_NO_HELP

1255

*/

1256

case '?': /* --help */

1257

argp_state_help(state, state->out_stream,

1258

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1259

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1260

case -3: /* --usage */

1261

argp_state_help(state, state->out_stream,

1262

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

case 'V': /* --version */

1264

fprintf(state->out_stream, "%s\n", argp_program_version);

1265

exit(argp_err_exit_status);

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1266

1000

break;

1267

1001

default:

1268

1002

return ARGP_ERR_UNKNOWN;

1269

1003

}

1270

return errno;

1004

return 0;

1271

1005

}

1272

1006

1273

1007

struct argp argp = { .options = options, .parser = parse_opt,

1274

1008

.args_doc = "",

1275

1009

.doc = "Mandos client -- Get and decrypt"

1276

1010

" passwords from a Mandos server" };

1277

ret = argp_parse(&argp, argc, argv,

1278

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1279

switch(ret){

1280

case 0:

1281

break;

1282

case ENOMEM:

1283

default:

1284

errno = ret;

1285

perror("argp_parse");

1286

exitcode = EX_OSERR;

1287

goto end;

1288

case EINVAL:

1289

exitcode = EX_USAGE;

1011

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1012

if(ret == ARGP_ERR_UNKNOWN){

1013

fprintf(stderr, "Unknown error while parsing arguments\n");

1014

exitcode = EXIT_FAILURE;

1290

1015

goto end;

1291

1016

}

1292

1017

}

1294

1019

if(not debug){

1295

1020

avahi_set_log_function(empty_log);

1296

1021

}

1297

1298

if(interface[0] == '\0'){

1299

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1301

alphasort);

1302

if(ret >= 1){

1303

/* Pick the first good interface */

1304

interface = strdup(direntries[0]->d_name);

1305

if(debug){

1306

fprintf(stderr, "Using interface \"%s\"\n", interface);

1307

}

1308

if(interface == NULL){

1309

perror("malloc");

1310

free(direntries);

1311

exitcode = EXIT_FAILURE;

1312

goto end;

1313

}

1314

free(direntries);

1315

} else {

1316

free(direntries);

1317

fprintf(stderr, "Could not find a network interface\n");

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

}

1322

1022

1323

1023

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1324

1024

from the signal handler */

1327

1027

mc.simple_poll = avahi_simple_poll_new();

1328

1028

if(mc.simple_poll == NULL){

1329

1029

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1330

exitcode = EX_UNAVAILABLE;

1030

exitcode = EXIT_FAILURE;

1331

1031

goto end;

1332

1032

}

1333

1033

1335

1035

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1336

1036

if(ret == -1){

1337

1037

perror("sigaddset");

1338

exitcode = EX_OSERR;

1038

exitcode = EXIT_FAILURE;

1339

1039

goto end;

1340

1040

}

1341

1041

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1342

1042

if(ret == -1){

1343

1043

perror("sigaddset");

1344

exitcode = EX_OSERR;

1044

exitcode = EXIT_FAILURE;

1345

1045

goto end;

1346

1046

}

1347

1047

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1348

1048

if(ret == -1){

1349

1049

perror("sigaddset");

1350

exitcode = EX_OSERR;

1351

goto end;

1352

}

1353

/* Need to check if the handler is SIG_IGN before handling:

1354

| [[info:libc:Initial Signal Actions]] |

1355

| [[info:libc:Basic Signal Handling]] |

1356

*/

1357

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1358

if(ret == -1){

1359

perror("sigaction");

1360

return EX_OSERR;

1361

}

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

ret = sigaction(SIGINT, &sigterm_action, NULL);

1364

if(ret == -1){

1365

perror("sigaction");

1366

exitcode = EX_OSERR;

1367

goto end;

1368

}

1369

}

1370

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1371

if(ret == -1){

1372

perror("sigaction");

1373

return EX_OSERR;

1374

}

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1377

if(ret == -1){

1378

perror("sigaction");

1379

exitcode = EX_OSERR;

1380

goto end;

1381

}

1382

}

1383

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1384

if(ret == -1){

1385

perror("sigaction");

1386

return EX_OSERR;

1387

}

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1390

if(ret == -1){

1391

perror("sigaction");

1392

exitcode = EX_OSERR;

1393

goto end;

1394

}

1395

}

1050

exitcode = EXIT_FAILURE;

1051

goto end;

1052

}

1053

ret = sigaction(SIGTERM, &sigterm_action, &old_sigterm_action);

1054

if(ret == -1){

1055

perror("sigaction");

1056

exitcode = EXIT_FAILURE;

1057

goto end;

1058

}

1396

1059

1397

1060

/* If the interface is down, bring it up */

1398

if(strcmp(interface, "none") != 0){

1399

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

if(if_index == 0){

1401

fprintf(stderr, "No such interface: \"%s\"\n", interface);

1402

exitcode = EX_UNAVAILABLE;

1403

goto end;

1404

}

1405

1406

if(quit_now){

1407

goto end;

1408

}

1409

1410

/* Re-raise priviliges */

1411

errno = 0;

1412

ret = seteuid(0);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

1061

if(interface[0] != '\0'){

1417

1062

#ifdef __linux__

1418

1063

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1419

messages about the network interface to mess up the prompt */

1064

messages to mess up the prompt */

1420

1065

ret = klogctl(8, NULL, 5);

1421

1066

bool restore_loglevel = true;

1422

1067

if(ret == -1){

1428

1073

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1074

if(sd < 0){

1430

1075

perror("socket");

1431

exitcode = EX_OSERR;

1076

exitcode = EXIT_FAILURE;

1432

1077

#ifdef __linux__

1433

1078

if(restore_loglevel){

1434

1079

ret = klogctl(7, NULL, 0);

1437

1082

}

1438

1083

}

1439

1084

#endif /* __linux__ */

1440

/* Lower privileges */

1441

errno = 0;

1442

ret = seteuid(uid);

1443

if(ret == -1){

1444

perror("seteuid");

1445

}

1446

1085

goto end;

1447

1086

}

1448

1087

strcpy(network.ifr_name, interface);

1457

1096

}

1458

1097

}

1459

1098

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1461

/* Lower privileges */

1462

errno = 0;

1463

ret = seteuid(uid);

1464

if(ret == -1){

1465

perror("seteuid");

1466

}

1099

exitcode = EXIT_FAILURE;

1467

1100

goto end;

1468

1101

}

1469

1102

if((network.ifr_flags & IFF_UP) == 0){

1470

1103

network.ifr_flags |= IFF_UP;

1471

take_down_interface = true;

1472

1104

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1473

1105

if(ret == -1){

1474

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1477

1108

#ifdef __linux__

1478

1109

if(restore_loglevel){

1479

1110

ret = klogctl(7, NULL, 0);

1482

1113

}

1483

1114

}

1484

1115

#endif /* __linux__ */

1485

/* Lower privileges */

1486

errno = 0;

1487

ret = seteuid(uid);

1488

if(ret == -1){

1489

perror("seteuid");

1490

}

1491

1116

goto end;

1492

1117

}

1493

1118

}

1505

1130

perror("nanosleep");

1506

1131

}

1507

1132

}

1508

if(not take_down_interface){

1509

/* We won't need the socket anymore */

1510

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1511

if(ret == -1){

1512

perror("close");

1513

}

1133

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1134

if(ret == -1){

1135

perror("close");

1514

1136

}

1515

1137

#ifdef __linux__

1516

1138

if(restore_loglevel){

1521

1143

}

1522

1144

}

1523

1145

#endif /* __linux__ */

1524

/* Lower privileges */

1525

errno = 0;

1526

if(take_down_interface){

1527

/* Lower privileges */

1528

ret = seteuid(uid);

1529

if(ret == -1){

1530

perror("seteuid");

1531

}

1532

} else {

1533

/* Lower privileges permanently */

1534

ret = setuid(uid);

1535

if(ret == -1){

1536

perror("setuid");

1537

}

1538

}

1539

}

1540

1541

if(quit_now){

1542

goto end;

1146

}

1147

1148

uid = getuid();

1149

gid = getgid();

1150

1151

errno = 0;

1152

setgid(gid);

1153

if(ret == -1){

1154

perror("setgid");

1155

}

1156

1157

ret = setuid(uid);

1158

if(ret == -1){

1159

perror("setuid");

1543

1160

}

1544

1161

1545

1162

ret = init_gnutls_global(pubkey, seckey);

1546

1163

if(ret == -1){

1547

1164

fprintf(stderr, "init_gnutls_global failed\n");

1548

exitcode = EX_UNAVAILABLE;

1165

exitcode = EXIT_FAILURE;

1549

1166

goto end;

1550

1167

} else {

1551

1168

gnutls_initialized = true;

1552

1169

}

1553

1170

1554

if(quit_now){

1555

goto end;

1556

}

1557

1558

tempdir_created = true;

1559

1171

if(mkdtemp(tempdir) == NULL){

1560

tempdir_created = false;

1561

1172

perror("mkdtemp");

1562

1173

goto end;

1563

1174

}

1564

1565

if(quit_now){

1566

goto end;

1567

}

1175

tempdir_created = true;

1568

1176

1569

1177

if(not init_gpgme(pubkey, seckey, tempdir)){

1570

1178

fprintf(stderr, "init_gpgme failed\n");

1571

exitcode = EX_UNAVAILABLE;

1179

exitcode = EXIT_FAILURE;

1572

1180

goto end;

1573

1181

} else {

1574

1182

gpgme_initialized = true;

1575

1183

}

1576

1184

1577

if(quit_now){

1578

goto end;

1185

if(interface[0] != '\0'){

1186

if_index = (AvahiIfIndex) if_nametoindex(interface);

1187

if(if_index == 0){

1188

fprintf(stderr, "No such interface: \"%s\"\n", interface);

1189

exitcode = EXIT_FAILURE;

1190

goto end;

1191

}

1579

1192

}

1580

1193

1581

1194

if(connect_to != NULL){

1584

1197

char *address = strrchr(connect_to, ':');

1585

1198

if(address == NULL){

1586

1199

fprintf(stderr, "No colon in address\n");

1587

exitcode = EX_USAGE;

1588

goto end;

1589

}

1590

1591

if(quit_now){

1592

goto end;

1593

}

1594

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

1595

1203

uint16_t port;

1596

1204

errno = 0;

1597

1205

tmpmax = strtoimax(address+1, &tmp, 10);

1598

1206

if(errno != 0 or tmp == address+1 or *tmp != '\0'

1599

1207

or tmpmax != (uint16_t)tmpmax){

1600

1208

fprintf(stderr, "Bad port number\n");

1601

exitcode = EX_USAGE;

1602

goto end;

1603

}

1604

1605

if(quit_now){

1606

goto end;

1607

}

1608

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

1609

1212

port = (uint16_t)tmpmax;

1610

1213

*address = '\0';

1611

1214

address = connect_to;

1616

1219

} else {

1617

1220

af = AF_INET;

1618

1221

}

1619

1620

if(quit_now){

1621

goto end;

1622

}

1623

1624

while(not quit_now){

1625

ret = start_mandos_communication(address, port, if_index, af);

1626

if(quit_now or ret == 0){

1627

break;

1628

}

1629

sleep(15);

1630

};

1631

1632

if (not quit_now){

1222

ret = start_mandos_communication(address, port, if_index, af);

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

1633

1226

exitcode = EXIT_SUCCESS;

1634

1227

}

1635

1636

goto end;

1637

}

1638

1639

if(quit_now){

1640

goto end;

1641

}

1642

1228

goto end;

1229

}

1230

1643

1231

{

1644

1232

AvahiServerConfig config;

1645

1233

/* Do not publish any local Zeroconf records */

1662

1250

if(mc.server == NULL){

1663

1251

fprintf(stderr, "Failed to create Avahi server: %s\n",

1664

1252

avahi_strerror(error));

1665

exitcode = EX_UNAVAILABLE;

1666

goto end;

1667

}

1668

1669

if(quit_now){

1253

exitcode = EXIT_FAILURE;

1670

1254

goto end;

1671

1255

}

1672

1256

1677

1261

if(sb == NULL){

1678

1262

fprintf(stderr, "Failed to create service browser: %s\n",

1679

1263

avahi_strerror(avahi_server_errno(mc.server)));

1680

exitcode = EX_UNAVAILABLE;

1681

goto end;

1682

}

1683

1684

if(quit_now){

1264

exitcode = EXIT_FAILURE;

1685

1265

goto end;

1686

1266

}

1687

1267

1719

1299

gpgme_release(mc.ctx);

1720

1300

}

1721

1301

1722

/* Take down the network interface */

1723

if(take_down_interface){

1724

/* Re-raise priviliges */

1725

errno = 0;

1726

ret = seteuid(0);

1727

if(ret == -1){

1728

perror("seteuid");

1729

}

1730

if(geteuid() == 0){

1731

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1732

if(ret == -1){

1733

perror("ioctl SIOCGIFFLAGS");

1734

} else if(network.ifr_flags & IFF_UP) {

1735

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

1736

ret = ioctl(sd, SIOCSIFFLAGS, &network);

1737

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1739

}

1740

}

1741

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1742

if(ret == -1){

1743

perror("close");

1744

}

1745

/* Lower privileges permanently */

1746

errno = 0;

1747

ret = setuid(uid);

1748

if(ret == -1){

1749

perror("setuid");

1750

}

1751

}

1752

}

1753

1754

1302

/* Removes the temp directory used by GPGME */

1755

1303

if(tempdir_created){

1756

1304

DIR *d;

1795

1343

}

1796

1344

}

1797

1345

1798

if(quit_now){

1799

sigemptyset(&old_sigterm_action.sa_mask);

1800

old_sigterm_action.sa_handler = SIG_DFL;

1801

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1802

&old_sigterm_action,

1803

NULL));

1804

if(ret == -1){

1805

perror("sigaction");

1806

}

1807

do {

1808

ret = raise(signal_received);

1809

} while(ret != 0 and errno == EINTR);

1810

if(ret != 0){

1811

perror("raise");

1812

abort();

1813

}

1814

TEMP_FAILURE_RETRY(pause());

1815

}

1816

1817

1346

return exitcode;

1818

1347

}