/mandos/trunk : revision 323

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

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() */

76

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

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

79

argp_state, struct argp,

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

}

423

418

}

424

419

425

420

/* OpenPGP credentials */

426

ret = gnutls_certificate_allocate_credentials(&mc.cred);

421

gnutls_certificate_allocate_credentials(&mc.cred);

427

422

if(ret != GNUTLS_E_SUCCESS){

428

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

423

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

424

from

425

-Wunreachable-code

426

*/

429

427

safer_gnutls_strerror(ret));

430

428

gnutls_global_deinit();

431

429

return -1;

478

476

static int init_gnutls_session(gnutls_session_t *session){

479

477

int ret;

480

478

/* GnuTLS session creation */

481

do {

482

ret = gnutls_init(session, GNUTLS_SERVER);

483

if(quit_now){

484

return -1;

485

}

486

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

479

ret = gnutls_init(session, GNUTLS_SERVER);

487

480

if(ret != GNUTLS_E_SUCCESS){

488

481

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

489

482

safer_gnutls_strerror(ret));

491

484

492

485

{

493

486

const char *err;

494

do {

495

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

496

if(quit_now){

497

gnutls_deinit(*session);

498

return -1;

499

}

500

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

487

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

501

488

if(ret != GNUTLS_E_SUCCESS){

502

489

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

503

490

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

507

494

}

508

495

}

509

496

510

do {

511

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

512

mc.cred);

513

if(quit_now){

514

gnutls_deinit(*session);

515

return -1;

516

}

517

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

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

518

499

if(ret != GNUTLS_E_SUCCESS){

519

500

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

520

501

safer_gnutls_strerror(ret));

523

504

}

524

505

525

506

/* ignore client certificate if any. */

526

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

527

509

528

510

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

529

511

538

520

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

539

521

AvahiIfIndex if_index,

540

522

int af){

541

int ret, tcp_sd = -1;

523

int ret, tcp_sd;

542

524

ssize_t sret;

543

525

union {

544

526

struct sockaddr_in in;

545

527

struct sockaddr_in6 in6;

546

528

} to;

547

529

char *buffer = NULL;

548

char *decrypted_buffer = NULL;

530

char *decrypted_buffer;

549

531

size_t buffer_length = 0;

550

532

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

551

534

size_t written;

552

int retval = -1;

535

int retval = 0;

553

536

gnutls_session_t session;

554

537

int pf; /* Protocol family */

555

538

556

errno = 0;

557

558

if(quit_now){

559

errno = EINTR;

560

return -1;

561

}

562

563

539

switch(af){

564

540

case AF_INET6:

565

541

pf = PF_INET6;

569

545

break;

570

546

default:

571

547

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

572

errno = EINVAL;

573

548

return -1;

574

549

}

575

550

585

560

586

561

tcp_sd = socket(pf, SOCK_STREAM, 0);

587

562

if(tcp_sd < 0){

588

int e = errno;

589

563

perror("socket");

590

errno = e;

591

goto mandos_end;

592

}

593

594

if(quit_now){

595

errno = EINTR;

596

goto mandos_end;

564

return -1;

597

565

}

598

566

599

567

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

600

568

if(af == AF_INET6){

601

to.in6.sin6_family = (sa_family_t)af;

569

to.in6.sin6_family = (uint16_t)af;

602

570

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

603

571

} else { /* IPv4 */

604

572

to.in.sin_family = (sa_family_t)af;

605

573

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

606

574

}

607

575

if(ret < 0 ){

608

int e = errno;

609

576

perror("inet_pton");

610

errno = e;

611

goto mandos_end;

577

return -1;

612

578

}

613

579

if(ret == 0){

614

int e = errno;

615

580

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

616

errno = e;

617

goto mandos_end;

581

return -1;

618

582

}

619

583

if(af == AF_INET6){

620

584

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

627

591

if(if_index == AVAHI_IF_UNSPEC){

628

592

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

629

593

" without a network interface\n");

630

errno = EINVAL;

631

goto mandos_end;

594

return -1;

632

595

}

633

596

/* Set the network interface number as scope */

634

597

to.in6.sin6_scope_id = (uint32_t)if_index;

639

602

-Wunreachable-code */

640

603

}

641

604

642

if(quit_now){

643

errno = EINTR;

644

goto mandos_end;

645

}

646

647

605

if(debug){

648

606

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

649

607

char interface[IF_NAMESIZE];

676

634

}

677

635

}

678

636

679

if(quit_now){

680

errno = EINTR;

681

goto mandos_end;

682

}

683

684

637

if(af == AF_INET6){

685

638

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

686

639

} else {

687

640

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

688

641

}

689

642

if(ret < 0){

690

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

691

int e = errno;

692

perror("connect");

693

errno = e;

694

}

695

goto mandos_end;

696

}

697

698

if(quit_now){

699

errno = EINTR;

700

goto mandos_end;

643

perror("connect");

644

return -1;

701

645

}

702

646

703

647

const char *out = mandos_protocol_version;

707

651

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

708

652

out_size - written));

709

653

if(ret == -1){

710

int e = errno;

711

654

perror("write");

712

errno = e;

655

retval = -1;

713

656

goto mandos_end;

714

657

}

715

658

written += (size_t)ret;

723

666

break;

724

667

}

725

668

}

726

727

if(quit_now){

728

errno = EINTR;

729

goto mandos_end;

730

}

731

669

}

732

670

733

671

if(debug){

734

672

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

735

673

}

736

674

737

if(quit_now){

738

errno = EINTR;

739

goto mandos_end;

740

}

741

742

675

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

743

676

744

if(quit_now){

745

errno = EINTR;

746

goto mandos_end;

747

}

748

749

do {

677

do{

750

678

ret = gnutls_handshake(session);

751

if(quit_now){

752

errno = EINTR;

753

goto mandos_end;

754

}

755

679

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

756

680

757

681

if(ret != GNUTLS_E_SUCCESS){

759

683

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

760

684

gnutls_perror(ret);

761

685

}

762

errno = EPROTO;

686

retval = -1;

763

687

goto mandos_end;

764

688

}

765

689

771

695

}

772

696

773

697

while(true){

774

775

if(quit_now){

776

errno = EINTR;

777

goto mandos_end;

778

}

779

780

698

buffer_capacity = incbuffer(&buffer, buffer_length,

781

699

buffer_capacity);

782

700

if(buffer_capacity == 0){

783

int e = errno;

784

701

perror("incbuffer");

785

errno = e;

786

goto mandos_end;

787

}

788

789

if(quit_now){

790

errno = EINTR;

702

retval = -1;

791

703

goto mandos_end;

792

704

}

793

705

802

714

case GNUTLS_E_AGAIN:

803

715

break;

804

716

case GNUTLS_E_REHANDSHAKE:

805

do {

717

do{

806

718

ret = gnutls_handshake(session);

807

808

if(quit_now){

809

errno = EINTR;

810

goto mandos_end;

811

}

812

719

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

813

720

if(ret < 0){

814

721

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

815

722

gnutls_perror(ret);

816

errno = EPROTO;

723

retval = -1;

817

724

goto mandos_end;

818

725

}

819

726

break;

820

727

default:

821

728

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

822

729

" encrypted session with Mandos server\n");

730

retval = -1;

823

731

gnutls_bye(session, GNUTLS_SHUT_RDWR);

824

errno = EIO;

825

732

goto mandos_end;

826

733

}

827

734

} else {

833

740

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

834

741

}

835

742

836

if(quit_now){

837

errno = EINTR;

838

goto mandos_end;

839

}

840

841

do {

842

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

843

if(quit_now){

844

errno = EINTR;

845

goto mandos_end;

846

}

847

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

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

848

744

849

745

if(buffer_length > 0){

850

ssize_t decrypted_buffer_size;

851

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

852

747

buffer_length,

853

748

&decrypted_buffer);

854

749

if(decrypted_buffer_size >= 0){

855

856

750

written = 0;

857

751

while(written < (size_t) decrypted_buffer_size){

858

if(quit_now){

859

errno = EINTR;

860

goto mandos_end;

861

}

862

863

752

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

864

753

(size_t)decrypted_buffer_size - written,

865

754

stdout);

866

755

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

867

int e = errno;

868

756

if(debug){

869

757

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

870

758

strerror(errno));

871

759

}

872

errno = e;

873

goto mandos_end;

760

retval = -1;

761

break;

874

762

}

875

763

written += (size_t)ret;

876

764

}

877

retval = 0;

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

878

768

}

769

} else {

770

retval = -1;

879

771

}

880

772

881

773

/* Shutdown procedure */

882

774

883

775

mandos_end:

884

{

885

int e = errno;

886

free(decrypted_buffer);

887

free(buffer);

888

if(tcp_sd >= 0){

889

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

890

}

891

if(ret == -1){

892

if(e == 0){

893

e = errno;

894

}

895

perror("close");

896

}

897

gnutls_deinit(session);

898

if(quit_now){

899

e = EINTR;

900

retval = -1;

901

}

902

errno = e;

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

903

780

}

781

gnutls_deinit(session);

904

782

return retval;

905

783

}

906

784

923

801

/* Called whenever a service has been resolved successfully or

924

802

timed out */

925

803

926

if(quit_now){

927

return;

928

}

929

930

804

switch(event){

931

805

default:

932

806

case AVAHI_RESOLVER_FAILURE:

969

843

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

970

844

is removed from the LAN */

971

845

972

if(quit_now){

973

return;

974

}

975

976

846

switch(event){

977

847

default:

978

848

case AVAHI_BROWSER_FAILURE:

1007

877

}

1008

878

}

1009

879

880

sig_atomic_t quit_now = 0;

881

1010

882

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

1011

static void handle_sigterm(int sig){

883

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

1012

884

if(quit_now){

1013

885

return;

1014

886

}

1015

887

quit_now = 1;

1016

signal_received = sig;

1017

888

int old_errno = errno;

1018

889

if(mc.simple_poll != NULL){

1019

890

avahi_simple_poll_quit(mc.simple_poll);

1021

892

errno = old_errno;

1022

893

}

1023

894

1024

/*

1025

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

1026

* corresponds to an acceptable network device.

1027

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

1028

*/

1029

int good_interface(const struct dirent *if_entry){

1030

ssize_t ssret;

1031

char *flagname = NULL;

1032

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

1033

return 0;

1034

}

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

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

1042

if(flags_fd == -1){

1043

perror("open");

1044

free(flagname);

1045

return 0;

1046

}

1047

free(flagname);

1048

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

1049

/* read line from flags_fd */

1050

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1051

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

1052

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

1053

if(flagstring == NULL){

1054

perror("malloc");

1055

close(flags_fd);

1056

return 0;

1057

}

1058

while(to_read > 0){

1059

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

1060

(size_t)to_read));

1061

if(ssret == -1){

1062

perror("read");

1063

free(flagstring);

1064

close(flags_fd);

1065

return 0;

1066

}

1067

to_read -= ssret;

1068

if(ssret == 0){

1069

break;

1070

}

1071

}

1072

close(flags_fd);

1073

intmax_t tmpmax;

1074

char *tmp;

1075

errno = 0;

1076

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

1077

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

1078

and not (isspace(*tmp)))

1079

or tmpmax != (ifreq_flags)tmpmax){

1080

if(debug){

1081

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

1082

flagstring, if_entry->d_name);

1083

}

1084

free(flagstring);

1085

return 0;

1086

}

1087

free(flagstring);

1088

ifreq_flags flags = (ifreq_flags)tmpmax;

1089

/* Reject the loopback device */

1090

if(flags & IFF_LOOPBACK){

1091

if(debug){

1092

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

1093

if_entry->d_name);

1094

}

1095

return 0;

1096

}

1097

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

1098

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

1099

if(debug){

1100

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

1101

if_entry->d_name);

1102

}

1103

return 1;

1104

}

1105

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

1106

if(not (flags & IFF_BROADCAST)){

1107

if(debug){

1108

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

1109

if_entry->d_name);

1110

}

1111

return 0;

1112

}

1113

/* Reject non-ARP interfaces (including dummy interfaces) */

1114

if(flags & IFF_NOARP){

1115

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 0;

1120

}

1121

/* Accept this device */

1122

if(debug){

1123

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

1124

if_entry->d_name);

1125

}

1126

return 1;

1127

}

1128

1129

895

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

1130

896

AvahiSServiceBrowser *sb = NULL;

1131

897

int error;

1133

899

intmax_t tmpmax;

1134

900

char *tmp;

1135

901

int exitcode = EXIT_SUCCESS;

1136

const char *interface = "";

902

const char *interface = "eth0";

1137

903

struct ifreq network;

1138

int sd = -1;

1139

bool take_down_interface = false;

904

int sd;

1140

905

uid_t uid;

1141

906

gid_t gid;

907

char *connect_to = NULL;

1142

908

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

1143

909

bool tempdir_created = false;

1144

910

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1149

915

bool gpgme_initialized = false;

1150

916

float delay = 2.5f;

1151

917

1152

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

struct sigaction old_sigterm_action;

1153

919

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1154

920

1155

uid = getuid();

1156

gid = getgid();

1157

1158

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

1159

errno = 0;

1160

ret = setgid(gid);

1161

if(ret == -1){

1162

perror("setgid");

1163

}

1164

1165

/* Lower user privileges (temporarily) */

1166

errno = 0;

1167

ret = seteuid(uid);

1168

if(ret == -1){

1169

perror("seteuid");

1170

}

1171

1172

if(quit_now){

1173

goto end;

1174

}

1175

1176

921

{

1177

922

struct argp_option options[] = {

1178

923

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

1207

952

.arg = "SECONDS",

1208

953

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

1209

954

.group = 2 },

1210

/*

1211

* These reproduce what we would get without ARGP_NO_HELP

1212

*/

1213

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

1214

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

1215

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

1216

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

1217

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

1218

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

1219

955

{ .name = NULL }

1220

956

};

1221

957

1222

958

error_t parse_opt(int key, char *arg,

1223

959

struct argp_state *state){

1224

errno = 0;

1225

960

switch(key){

1226

961

case 128: /* --debug */

1227

962

debug = true;

1243

978

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

1244

979

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

1245

980

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

1246

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

981

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

982

exit(EXIT_FAILURE);

1247

983

}

1248

984

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

1249

985

break;

1254

990

errno = 0;

1255

991

delay = strtof(arg, &tmp);

1256

992

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

1257

argp_error(state, "Bad delay");

993

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

994

exit(EXIT_FAILURE);

1258

995

}

1259

996

break;

1260

/*

1261

* These reproduce what we would get without ARGP_NO_HELP

1262

*/

1263

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

1264

argp_state_help(state, state->out_stream,

1265

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1266

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1267

case -3: /* --usage */

1268

argp_state_help(state, state->out_stream,

1269

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1270

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

1271

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

1272

exit(argp_err_exit_status);

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1273

1000

break;

1274

1001

default:

1275

1002

return ARGP_ERR_UNKNOWN;

1276

1003

}

1277

return errno;

1004

return 0;

1278

1005

}

1279

1006

1280

1007

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

1281

1008

.args_doc = "",

1282

1009

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

1283

1010

" passwords from a Mandos server" };

1284

ret = argp_parse(&argp, argc, argv,

1285

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1286

switch(ret){

1287

case 0:

1288

break;

1289

case ENOMEM:

1290

default:

1291

errno = ret;

1292

perror("argp_parse");

1293

exitcode = EX_OSERR;

1294

goto end;

1295

case EINVAL:

1296

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;

1297

1015

goto end;

1298

1016

}

1299

1017

}

1301

1019

if(not debug){

1302

1020

avahi_set_log_function(empty_log);

1303

1021

}

1304

1305

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

1306

struct dirent **direntries;

1307

ret = scandir(sys_class_net, &direntries, good_interface,

1308

alphasort);

1309

if(ret >= 1){

1310

/* Pick the first good interface */

1311

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

1312

if(debug){

1313

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

1314

}

1315

if(interface == NULL){

1316

perror("malloc");

1317

free(direntries);

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

free(direntries);

1322

} else {

1323

free(direntries);

1324

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

1325

exitcode = EXIT_FAILURE;

1326

goto end;

1327

}

1328

}

1329

1022

1330

1023

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

1331

1024

from the signal handler */

1334

1027

mc.simple_poll = avahi_simple_poll_new();

1335

1028

if(mc.simple_poll == NULL){

1336

1029

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

1337

exitcode = EX_UNAVAILABLE;

1030

exitcode = EXIT_FAILURE;

1338

1031

goto end;

1339

1032

}

1340

1033

1342

1035

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

1343

1036

if(ret == -1){

1344

1037

perror("sigaddset");

1345

exitcode = EX_OSERR;

1038

exitcode = EXIT_FAILURE;

1346

1039

goto end;

1347

1040

}

1348

1041

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

1349

1042

if(ret == -1){

1350

1043

perror("sigaddset");

1351

exitcode = EX_OSERR;

1044

exitcode = EXIT_FAILURE;

1352

1045

goto end;

1353

1046

}

1354

1047

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

1355

1048

if(ret == -1){

1356

1049

perror("sigaddset");

1357

exitcode = EX_OSERR;

1358

goto end;

1359

}

1360

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

1361

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

1362

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

1363

*/

1364

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

1365

if(ret == -1){

1366

perror("sigaction");

1367

return EX_OSERR;

1368

}

1369

if(old_sigterm_action.sa_handler != SIG_IGN){

1370

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

1371

if(ret == -1){

1372

perror("sigaction");

1373

exitcode = EX_OSERR;

1374

goto end;

1375

}

1376

}

1377

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

1378

if(ret == -1){

1379

perror("sigaction");

1380

return EX_OSERR;

1381

}

1382

if(old_sigterm_action.sa_handler != SIG_IGN){

1383

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

1384

if(ret == -1){

1385

perror("sigaction");

1386

exitcode = EX_OSERR;

1387

goto end;

1388

}

1389

}

1390

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

1391

if(ret == -1){

1392

perror("sigaction");

1393

return EX_OSERR;

1394

}

1395

if(old_sigterm_action.sa_handler != SIG_IGN){

1396

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

1397

if(ret == -1){

1398

perror("sigaction");

1399

exitcode = EX_OSERR;

1400

goto end;

1401

}

1402

}

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

}

1403

1059

1404

1060

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

1405

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

1406

if_index = (AvahiIfIndex) if_nametoindex(interface);

1407

if(if_index == 0){

1408

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

1409

exitcode = EX_UNAVAILABLE;

1410

goto end;

1411

}

1412

1413

if(quit_now){

1414

goto end;

1415

}

1416

1417

/* Re-raise priviliges */

1418

errno = 0;

1419

ret = seteuid(0);

1420

if(ret == -1){

1421

perror("seteuid");

1422

}

1423

1061

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

1424

1062

#ifdef __linux__

1425

1063

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1426

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

1064

messages to mess up the prompt */

1427

1065

ret = klogctl(8, NULL, 5);

1428

1066

bool restore_loglevel = true;

1429

1067

if(ret == -1){

1435

1073

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1436

1074

if(sd < 0){

1437

1075

perror("socket");

1438

exitcode = EX_OSERR;

1076

exitcode = EXIT_FAILURE;

1439

1077

#ifdef __linux__

1440

1078

if(restore_loglevel){

1441

1079

ret = klogctl(7, NULL, 0);

1444

1082

}

1445

1083

}

1446

1084

#endif /* __linux__ */

1447

/* Lower privileges */

1448

errno = 0;

1449

ret = seteuid(uid);

1450

if(ret == -1){

1451

perror("seteuid");

1452

}

1453

1085

goto end;

1454

1086

}

1455

1087

strcpy(network.ifr_name, interface);

1464

1096

}

1465

1097

}

1466

1098

#endif /* __linux__ */

1467

exitcode = EX_OSERR;

1468

/* Lower privileges */

1469

errno = 0;

1470

ret = seteuid(uid);

1471

if(ret == -1){

1472

perror("seteuid");

1473

}

1099

exitcode = EXIT_FAILURE;

1474

1100

goto end;

1475

1101

}

1476

1102

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

1477

1103

network.ifr_flags |= IFF_UP;

1478

take_down_interface = true;

1479

1104

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

1480

1105

if(ret == -1){

1481

take_down_interface = false;

1482

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1483

exitcode = EX_OSERR;

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1484

1108

#ifdef __linux__

1485

1109

if(restore_loglevel){

1486

1110

ret = klogctl(7, NULL, 0);

1489

1113

}

1490

1114

}

1491

1115

#endif /* __linux__ */

1492

/* Lower privileges */

1493

errno = 0;

1494

ret = seteuid(uid);

1495

if(ret == -1){

1496

perror("seteuid");

1497

}

1498

1116

goto end;

1499

1117

}

1500

1118

}

1512

1130

perror("nanosleep");

1513

1131

}

1514

1132

}

1515

if(not take_down_interface){

1516

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

1517

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

1518

if(ret == -1){

1519

perror("close");

1520

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1521

1136

}

1522

1137

#ifdef __linux__

1523

1138

if(restore_loglevel){

1528

1143

}

1529

1144

}

1530

1145

#endif /* __linux__ */

1531

/* Lower privileges */

1532

errno = 0;

1533

if(take_down_interface){

1534

/* Lower privileges */

1535

ret = seteuid(uid);

1536

if(ret == -1){

1537

perror("seteuid");

1538

}

1539

} else {

1540

/* Lower privileges permanently */

1541

ret = setuid(uid);

1542

if(ret == -1){

1543

perror("setuid");

1544

}

1545

}

1546

}

1547

1548

if(quit_now){

1549

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");

1550

1160

}

1551

1161

1552

1162

ret = init_gnutls_global(pubkey, seckey);

1553

1163

if(ret == -1){

1554

1164

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

1555

exitcode = EX_UNAVAILABLE;

1165

exitcode = EXIT_FAILURE;

1556

1166

goto end;

1557

1167

} else {

1558

1168

gnutls_initialized = true;

1559

1169

}

1560

1170

1561

if(quit_now){

1562

goto end;

1563

}

1564

1565

tempdir_created = true;

1566

1171

if(mkdtemp(tempdir) == NULL){

1567

tempdir_created = false;

1568

1172

perror("mkdtemp");

1569

1173

goto end;

1570

1174

}

1571

1572

if(quit_now){

1573

goto end;

1574

}

1175

tempdir_created = true;

1575

1176

1576

1177

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

1577

1178

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

1578

exitcode = EX_UNAVAILABLE;

1179

exitcode = EXIT_FAILURE;

1579

1180

goto end;

1580

1181

} else {

1581

1182

gpgme_initialized = true;

1582

1183

}

1583

1184

1584

if(quit_now){

1585

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

}

1586

1192

}

1587

1193

1588

1194

if(connect_to != NULL){

1591

1197

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

1592

1198

if(address == NULL){

1593

1199

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

1594

exitcode = EX_USAGE;

1595

goto end;

1596

}

1597

1598

if(quit_now){

1599

goto end;

1600

}

1601

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

1602

1203

uint16_t port;

1603

1204

errno = 0;

1604

1205

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

1605

1206

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

1606

1207

or tmpmax != (uint16_t)tmpmax){

1607

1208

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

1608

exitcode = EX_USAGE;

1609

goto end;

1610

}

1611

1612

if(quit_now){

1613

goto end;

1614

}

1615

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

1616

1212

port = (uint16_t)tmpmax;

1617

1213

*address = '\0';

1618

1214

address = connect_to;

1623

1219

} else {

1624

1220

af = AF_INET;

1625

1221

}

1626

1627

if(quit_now){

1628

goto end;

1629

}

1630

1631

while(not quit_now){

1632

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

1633

if(quit_now or ret == 0){

1634

break;

1635

}

1636

sleep(15);

1637

};

1638

1639

if (not quit_now){

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

1640

1226

exitcode = EXIT_SUCCESS;

1641

1227

}

1642

1643

goto end;

1644

}

1645

1646

if(quit_now){

1647

goto end;

1648

}

1649

1228

goto end;

1229

}

1230

1650

1231

{

1651

1232

AvahiServerConfig config;

1652

1233

/* Do not publish any local Zeroconf records */

1669

1250

if(mc.server == NULL){

1670

1251

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

1671

1252

avahi_strerror(error));

1672

exitcode = EX_UNAVAILABLE;

1673

goto end;

1674

}

1675

1676

if(quit_now){

1253

exitcode = EXIT_FAILURE;

1677

1254

goto end;

1678

1255

}

1679

1256

1684

1261

if(sb == NULL){

1685

1262

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

1686

1263

avahi_strerror(avahi_server_errno(mc.server)));

1687

exitcode = EX_UNAVAILABLE;

1688

goto end;

1689

}

1690

1691

if(quit_now){

1264

exitcode = EXIT_FAILURE;

1692

1265

goto end;

1693

1266

}

1694

1267

1726

1299

gpgme_release(mc.ctx);

1727

1300

}

1728

1301

1729

/* Take down the network interface */

1730

if(take_down_interface){

1731

/* Re-raise priviliges */

1732

errno = 0;

1733

ret = seteuid(0);

1734

if(ret == -1){

1735

perror("seteuid");

1736

}

1737

if(geteuid() == 0){

1738

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

1739

if(ret == -1){

1740

perror("ioctl SIOCGIFFLAGS");

1741

} else if(network.ifr_flags & IFF_UP) {

1742

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

1743

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

1744

if(ret == -1){

1745

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1746

}

1747

}

1748

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

1749

if(ret == -1){

1750

perror("close");

1751

}

1752

/* Lower privileges permanently */

1753

errno = 0;

1754

ret = setuid(uid);

1755

if(ret == -1){

1756

perror("setuid");

1757

}

1758

}

1759

}

1760

1761

1302

/* Removes the temp directory used by GPGME */

1762

1303

if(tempdir_created){

1763

1304

DIR *d;

1802

1343

}

1803

1344

}

1804

1345

1805

if(quit_now){

1806

sigemptyset(&old_sigterm_action.sa_mask);

1807

old_sigterm_action.sa_handler = SIG_DFL;

1808

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1809

&old_sigterm_action,

1810

NULL));

1811

if(ret == -1){

1812

perror("sigaction");

1813

}

1814

do {

1815

ret = raise(signal_received);

1816

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

1817

if(ret != 0){

1818

perror("raise");

1819

abort();

1820

}

1821

TEMP_FAILURE_RETRY(pause());

1822

}

1823

1824

1346

return exitcode;

1825

1347

}