/mandos/trunk : revision 341

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() */

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));

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

/* Spurious warnings from -Wint-to-pointer-cast */

746

675

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

747

676

748

if(quit_now){

749

errno = EINTR;

750

goto mandos_end;

751

}

752

753

do {

677

do{

754

678

ret = gnutls_handshake(session);

755

if(quit_now){

756

errno = EINTR;

757

goto mandos_end;

758

}

759

679

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

760

680

761

681

if(ret != GNUTLS_E_SUCCESS){

763

683

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

764

684

gnutls_perror(ret);

765

685

}

766

errno = EPROTO;

686

retval = -1;

767

687

goto mandos_end;

768

688

}

769

689

775

695

}

776

696

777

697

while(true){

778

779

if(quit_now){

780

errno = EINTR;

781

goto mandos_end;

782

}

783

784

698

buffer_capacity = incbuffer(&buffer, buffer_length,

785

699

buffer_capacity);

786

700

if(buffer_capacity == 0){

787

int e = errno;

788

701

perror("incbuffer");

789

errno = e;

790

goto mandos_end;

791

}

792

793

if(quit_now){

794

errno = EINTR;

702

retval = -1;

795

703

goto mandos_end;

796

704

}

797

705

806

714

case GNUTLS_E_AGAIN:

807

715

break;

808

716

case GNUTLS_E_REHANDSHAKE:

809

do {

717

do{

810

718

ret = gnutls_handshake(session);

811

812

if(quit_now){

813

errno = EINTR;

814

goto mandos_end;

815

}

816

719

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

817

720

if(ret < 0){

818

721

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

819

722

gnutls_perror(ret);

820

errno = EPROTO;

723

retval = -1;

821

724

goto mandos_end;

822

725

}

823

726

break;

824

727

default:

825

728

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

826

729

" encrypted session with Mandos server\n");

730

retval = -1;

827

731

gnutls_bye(session, GNUTLS_SHUT_RDWR);

828

errno = EIO;

829

732

goto mandos_end;

830

733

}

831

734

} else {

837

740

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

838

741

}

839

742

840

if(quit_now){

841

errno = EINTR;

842

goto mandos_end;

843

}

844

845

do {

846

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

847

if(quit_now){

848

errno = EINTR;

849

goto mandos_end;

850

}

851

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

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

852

744

853

745

if(buffer_length > 0){

854

ssize_t decrypted_buffer_size;

855

746

decrypted_buffer_size = pgp_packet_decrypt(buffer,

856

747

buffer_length,

857

748

&decrypted_buffer);

858

749

if(decrypted_buffer_size >= 0){

859

860

750

written = 0;

861

751

while(written < (size_t) decrypted_buffer_size){

862

if(quit_now){

863

errno = EINTR;

864

goto mandos_end;

865

}

866

867

752

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

868

753

(size_t)decrypted_buffer_size - written,

869

754

stdout);

870

755

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

871

int e = errno;

872

756

if(debug){

873

757

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

874

758

strerror(errno));

875

759

}

876

errno = e;

877

goto mandos_end;

760

retval = -1;

761

break;

878

762

}

879

763

written += (size_t)ret;

880

764

}

881

retval = 0;

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

882

768

}

769

} else {

770

retval = -1;

883

771

}

884

772

885

773

/* Shutdown procedure */

886

774

887

775

mandos_end:

888

{

889

int e = errno;

890

free(decrypted_buffer);

891

free(buffer);

892

if(tcp_sd >= 0){

893

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

894

}

895

if(ret == -1){

896

if(e == 0){

897

e = errno;

898

}

899

perror("close");

900

}

901

gnutls_deinit(session);

902

if(quit_now){

903

e = EINTR;

904

retval = -1;

905

}

906

errno = e;

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

907

780

}

781

gnutls_deinit(session);

908

782

return retval;

909

783

}

910

784

927

801

/* Called whenever a service has been resolved successfully or

928

802

timed out */

929

803

930

if(quit_now){

931

return;

932

}

933

934

804

switch(event){

935

805

default:

936

806

case AVAHI_RESOLVER_FAILURE:

973

843

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

974

844

is removed from the LAN */

975

845

976

if(quit_now){

977

return;

978

}

979

980

846

switch(event){

981

847

default:

982

848

case AVAHI_BROWSER_FAILURE:

1011

877

}

1012

878

}

1013

879

880

sig_atomic_t quit_now = 0;

881

1014

882

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

1015

static void handle_sigterm(int sig){

883

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

1016

884

if(quit_now){

1017

885

return;

1018

886

}

1019

887

quit_now = 1;

1020

signal_received = sig;

1021

888

int old_errno = errno;

1022

889

if(mc.simple_poll != NULL){

1023

890

avahi_simple_poll_quit(mc.simple_poll);

1025

892

errno = old_errno;

1026

893

}

1027

894

1028

/*

1029

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

1030

* corresponds to an acceptable network device.

1031

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

1032

*/

1033

int good_interface(const struct dirent *if_entry){

1034

ssize_t ssret;

1035

char *flagname = NULL;

1036

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

1037

return 0;

1038

}

1039

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

1040

if_entry->d_name);

1041

if(ret < 0){

1042

perror("asprintf");

1043

return 0;

1044

}

1045

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

1046

if(flags_fd == -1){

1047

perror("open");

1048

free(flagname);

1049

return 0;

1050

}

1051

free(flagname);

1052

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

1053

/* read line from flags_fd */

1054

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

1055

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

1056

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

1057

if(flagstring == NULL){

1058

perror("malloc");

1059

close(flags_fd);

1060

return 0;

1061

}

1062

while(to_read > 0){

1063

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

1064

(size_t)to_read));

1065

if(ssret == -1){

1066

perror("read");

1067

free(flagstring);

1068

close(flags_fd);

1069

return 0;

1070

}

1071

to_read -= ssret;

1072

if(ssret == 0){

1073

break;

1074

}

1075

}

1076

close(flags_fd);

1077

intmax_t tmpmax;

1078

char *tmp;

1079

errno = 0;

1080

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

1081

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

1082

and not (isspace(*tmp)))

1083

or tmpmax != (ifreq_flags)tmpmax){

1084

if(debug){

1085

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

1086

flagstring, if_entry->d_name);

1087

}

1088

free(flagstring);

1089

return 0;

1090

}

1091

free(flagstring);

1092

ifreq_flags flags = (ifreq_flags)tmpmax;

1093

/* Reject the loopback device */

1094

if(flags & IFF_LOOPBACK){

1095

if(debug){

1096

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

1097

if_entry->d_name);

1098

}

1099

return 0;

1100

}

1101

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

1102

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

1103

if(debug){

1104

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

1105

if_entry->d_name);

1106

}

1107

return 1;

1108

}

1109

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

1110

if(not (flags & IFF_BROADCAST)){

1111

if(debug){

1112

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

1113

if_entry->d_name);

1114

}

1115

return 0;

1116

}

1117

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

1118

if(flags & IFF_NOARP){

1119

if(debug){

1120

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

1121

if_entry->d_name);

1122

}

1123

return 0;

1124

}

1125

/* Accept this device */

1126

if(debug){

1127

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

1128

if_entry->d_name);

1129

}

1130

return 1;

1131

}

1132

1133

int notdotentries(const struct dirent *direntry){

1134

/* Skip "." and ".." */

1135

if(direntry->d_name[0] == '.'

1136

and (direntry->d_name[1] == '\0'

1137

or (direntry->d_name[1] == '.'

1138

and direntry->d_name[2] == '\0'))){

1139

return 0;

1140

}

1141

return 1;

1142

}

1143

1144

895

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

1145

896

AvahiSServiceBrowser *sb = NULL;

1146

897

int error;

1148

899

intmax_t tmpmax;

1149

900

char *tmp;

1150

901

int exitcode = EXIT_SUCCESS;

1151

const char *interface = "";

902

const char *interface = "eth0";

1152

903

struct ifreq network;

1153

int sd = -1;

1154

bool take_down_interface = false;

904

int sd;

1155

905

uid_t uid;

1156

906

gid_t gid;

907

char *connect_to = NULL;

1157

908

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

1158

909

bool tempdir_created = false;

1159

910

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1164

915

bool gpgme_initialized = false;

1165

916

float delay = 2.5f;

1166

917

1167

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

918

struct sigaction old_sigterm_action;

1168

919

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1169

920

1170

uid = getuid();

1171

gid = getgid();

1172

1173

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

1174

errno = 0;

1175

ret = setgid(gid);

1176

if(ret == -1){

1177

perror("setgid");

1178

}

1179

1180

/* Lower user privileges (temporarily) */

1181

errno = 0;

1182

ret = seteuid(uid);

1183

if(ret == -1){

1184

perror("seteuid");

1185

}

1186

1187

if(quit_now){

1188

goto end;

1189

}

1190

1191

921

{

1192

922

struct argp_option options[] = {

1193

923

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

1222

952

.arg = "SECONDS",

1223

953

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

1224

954

.group = 2 },

1225

/*

1226

* These reproduce what we would get without ARGP_NO_HELP

1227

*/

1228

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

1229

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

1230

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

1231

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

1232

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

1233

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

1234

955

{ .name = NULL }

1235

956

};

1236

957

1237

958

error_t parse_opt(int key, char *arg,

1238

959

struct argp_state *state){

1239

errno = 0;

1240

960

switch(key){

1241

961

case 128: /* --debug */

1242

962

debug = true;

1258

978

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

1259

979

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

1260

980

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

1261

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

981

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

982

exit(EXIT_FAILURE);

1262

983

}

1263

984

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

1264

985

break;

1269

990

errno = 0;

1270

991

delay = strtof(arg, &tmp);

1271

992

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

1272

argp_error(state, "Bad delay");

993

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

994

exit(EXIT_FAILURE);

1273

995

}

1274

996

break;

1275

/*

1276

* These reproduce what we would get without ARGP_NO_HELP

1277

*/

1278

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

1279

argp_state_help(state, state->out_stream,

1280

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1281

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1282

case -3: /* --usage */

1283

argp_state_help(state, state->out_stream,

1284

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1285

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

1286

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

1287

exit(argp_err_exit_status);

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

1288

1000

break;

1289

1001

default:

1290

1002

return ARGP_ERR_UNKNOWN;

1291

1003

}

1292

return errno;

1004

return 0;

1293

1005

}

1294

1006

1295

1007

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

1296

1008

.args_doc = "",

1297

1009

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

1298

1010

" passwords from a Mandos server" };

1299

ret = argp_parse(&argp, argc, argv,

1300

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1301

switch(ret){

1302

case 0:

1303

break;

1304

case ENOMEM:

1305

default:

1306

errno = ret;

1307

perror("argp_parse");

1308

exitcode = EX_OSERR;

1309

goto end;

1310

case EINVAL:

1311

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;

1312

1015

goto end;

1313

1016

}

1314

1017

}

1316

1019

if(not debug){

1317

1020

avahi_set_log_function(empty_log);

1318

1021

}

1319

1320

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

1321

struct dirent **direntries;

1322

ret = scandir(sys_class_net, &direntries, good_interface,

1323

alphasort);

1324

if(ret >= 1){

1325

/* Pick the first good interface */

1326

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

1327

if(debug){

1328

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

1329

}

1330

if(interface == NULL){

1331

perror("malloc");

1332

free(direntries);

1333

exitcode = EXIT_FAILURE;

1334

goto end;

1335

}

1336

free(direntries);

1337

} else {

1338

free(direntries);

1339

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

1340

exitcode = EXIT_FAILURE;

1341

goto end;

1342

}

1343

}

1344

1022

1345

1023

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

1346

1024

from the signal handler */

1349

1027

mc.simple_poll = avahi_simple_poll_new();

1350

1028

if(mc.simple_poll == NULL){

1351

1029

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

1352

exitcode = EX_UNAVAILABLE;

1030

exitcode = EXIT_FAILURE;

1353

1031

goto end;

1354

1032

}

1355

1033

1357

1035

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

1358

1036

if(ret == -1){

1359

1037

perror("sigaddset");

1360

exitcode = EX_OSERR;

1038

exitcode = EXIT_FAILURE;

1361

1039

goto end;

1362

1040

}

1363

1041

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

1364

1042

if(ret == -1){

1365

1043

perror("sigaddset");

1366

exitcode = EX_OSERR;

1044

exitcode = EXIT_FAILURE;

1367

1045

goto end;

1368

1046

}

1369

1047

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

1370

1048

if(ret == -1){

1371

1049

perror("sigaddset");

1372

exitcode = EX_OSERR;

1373

goto end;

1374

}

1375

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

1376

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

1377

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

1378

*/

1379

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

1380

if(ret == -1){

1381

perror("sigaction");

1382

return EX_OSERR;

1383

}

1384

if(old_sigterm_action.sa_handler != SIG_IGN){

1385

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

1386

if(ret == -1){

1387

perror("sigaction");

1388

exitcode = EX_OSERR;

1389

goto end;

1390

}

1391

}

1392

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

1393

if(ret == -1){

1394

perror("sigaction");

1395

return EX_OSERR;

1396

}

1397

if(old_sigterm_action.sa_handler != SIG_IGN){

1398

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

1399

if(ret == -1){

1400

perror("sigaction");

1401

exitcode = EX_OSERR;

1402

goto end;

1403

}

1404

}

1405

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

1406

if(ret == -1){

1407

perror("sigaction");

1408

return EX_OSERR;

1409

}

1410

if(old_sigterm_action.sa_handler != SIG_IGN){

1411

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

1412

if(ret == -1){

1413

perror("sigaction");

1414

exitcode = EX_OSERR;

1415

goto end;

1416

}

1417

}

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

}

1418

1059

1419

1060

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

1420

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

1421

if_index = (AvahiIfIndex) if_nametoindex(interface);

1422

if(if_index == 0){

1423

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

1424

exitcode = EX_UNAVAILABLE;

1425

goto end;

1426

}

1427

1428

if(quit_now){

1429

goto end;

1430

}

1431

1432

/* Re-raise priviliges */

1433

errno = 0;

1434

ret = seteuid(0);

1435

if(ret == -1){

1436

perror("seteuid");

1437

}

1438

1061

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

1439

1062

#ifdef __linux__

1440

1063

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1441

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

1064

messages to mess up the prompt */

1442

1065

ret = klogctl(8, NULL, 5);

1443

1066

bool restore_loglevel = true;

1444

1067

if(ret == -1){

1450

1073

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1451

1074

if(sd < 0){

1452

1075

perror("socket");

1453

exitcode = EX_OSERR;

1076

exitcode = EXIT_FAILURE;

1454

1077

#ifdef __linux__

1455

1078

if(restore_loglevel){

1456

1079

ret = klogctl(7, NULL, 0);

1459

1082

}

1460

1083

}

1461

1084

#endif /* __linux__ */

1462

/* Lower privileges */

1463

errno = 0;

1464

ret = seteuid(uid);

1465

if(ret == -1){

1466

perror("seteuid");

1467

}

1468

1085

goto end;

1469

1086

}

1470

1087

strcpy(network.ifr_name, interface);

1479

1096

}

1480

1097

}

1481

1098

#endif /* __linux__ */

1482

exitcode = EX_OSERR;

1483

/* Lower privileges */

1484

errno = 0;

1485

ret = seteuid(uid);

1486

if(ret == -1){

1487

perror("seteuid");

1488

}

1099

exitcode = EXIT_FAILURE;

1489

1100

goto end;

1490

1101

}

1491

1102

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

1492

1103

network.ifr_flags |= IFF_UP;

1493

take_down_interface = true;

1494

1104

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

1495

1105

if(ret == -1){

1496

take_down_interface = false;

1497

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1498

exitcode = EX_OSERR;

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1499

1108

#ifdef __linux__

1500

1109

if(restore_loglevel){

1501

1110

ret = klogctl(7, NULL, 0);

1504

1113

}

1505

1114

}

1506

1115

#endif /* __linux__ */

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror("seteuid");

1512

}

1513

1116

goto end;

1514

1117

}

1515

1118

}

1527

1130

perror("nanosleep");

1528

1131

}

1529

1132

}

1530

if(not take_down_interface){

1531

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

1532

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

1533

if(ret == -1){

1534

perror("close");

1535

}

1133

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

1134

if(ret == -1){

1135

perror("close");

1536

1136

}

1537

1137

#ifdef __linux__

1538

1138

if(restore_loglevel){

1543

1143

}

1544

1144

}

1545

1145

#endif /* __linux__ */

1546

/* Lower privileges */

1547

errno = 0;

1548

if(take_down_interface){

1549

/* Lower privileges */

1550

ret = seteuid(uid);

1551

if(ret == -1){

1552

perror("seteuid");

1553

}

1554

} else {

1555

/* Lower privileges permanently */

1556

ret = setuid(uid);

1557

if(ret == -1){

1558

perror("setuid");

1559

}

1560

}

1561

}

1562

1563

if(quit_now){

1564

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");

1565

1160

}

1566

1161

1567

1162

ret = init_gnutls_global(pubkey, seckey);

1568

1163

if(ret == -1){

1569

1164

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

1570

exitcode = EX_UNAVAILABLE;

1165

exitcode = EXIT_FAILURE;

1571

1166

goto end;

1572

1167

} else {

1573

1168

gnutls_initialized = true;

1574

1169

}

1575

1170

1576

if(quit_now){

1577

goto end;

1578

}

1579

1580

1171

if(mkdtemp(tempdir) == NULL){

1581

1172

perror("mkdtemp");

1582

1173

goto end;

1583

1174

}

1584

1175

tempdir_created = true;

1585

1176

1586

if(quit_now){

1587

goto end;

1588

}

1589

1590

1177

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

1591

1178

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

1592

exitcode = EX_UNAVAILABLE;

1179

exitcode = EXIT_FAILURE;

1593

1180

goto end;

1594

1181

} else {

1595

1182

gpgme_initialized = true;

1596

1183

}

1597

1184

1598

if(quit_now){

1599

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

}

1600

1192

}

1601

1193

1602

1194

if(connect_to != NULL){

1605

1197

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

1606

1198

if(address == NULL){

1607

1199

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

1608

exitcode = EX_USAGE;

1609

goto end;

1610

}

1611

1612

if(quit_now){

1613

goto end;

1614

}

1615

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

1616

1203

uint16_t port;

1617

1204

errno = 0;

1618

1205

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

1619

1206

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

1620

1207

or tmpmax != (uint16_t)tmpmax){

1621

1208

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

1622

exitcode = EX_USAGE;

1623

goto end;

1624

}

1625

1626

if(quit_now){

1627

goto end;

1628

}

1629

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

1630

1212

port = (uint16_t)tmpmax;

1631

1213

*address = '\0';

1632

1214

address = connect_to;

1637

1219

} else {

1638

1220

af = AF_INET;

1639

1221

}

1640

1641

if(quit_now){

1642

goto end;

1643

}

1644

1645

while(not quit_now){

1646

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

1647

if(quit_now or ret == 0){

1648

break;

1649

}

1650

sleep(15);

1651

};

1652

1653

if (not quit_now){

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

1654

1226

exitcode = EXIT_SUCCESS;

1655

1227

}

1656

1657

goto end;

1658

}

1659

1660

if(quit_now){

1661

goto end;

1662

}

1663

1228

goto end;

1229

}

1230

1664

1231

{

1665

1232

AvahiServerConfig config;

1666

1233

/* Do not publish any local Zeroconf records */

1683

1250

if(mc.server == NULL){

1684

1251

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

1685

1252

avahi_strerror(error));

1686

exitcode = EX_UNAVAILABLE;

1687

goto end;

1688

}

1689

1690

if(quit_now){

1253

exitcode = EXIT_FAILURE;

1691

1254

goto end;

1692

1255

}

1693

1256

1698

1261

if(sb == NULL){

1699

1262

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

1700

1263

avahi_strerror(avahi_server_errno(mc.server)));

1701

exitcode = EX_UNAVAILABLE;

1702

goto end;

1703

}

1704

1705

if(quit_now){

1264

exitcode = EXIT_FAILURE;

1706

1265

goto end;

1707

1266

}

1708

1267

1740

1299

gpgme_release(mc.ctx);

1741

1300

}

1742

1301

1743

/* Take down the network interface */

1744

if(take_down_interface){

1745

/* Re-raise priviliges */

1746

errno = 0;

1747

ret = seteuid(0);

1748

if(ret == -1){

1749

perror("seteuid");

1750

}

1751

if(geteuid() == 0){

1752

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

1753

if(ret == -1){

1754

perror("ioctl SIOCGIFFLAGS");

1755

} else if(network.ifr_flags & IFF_UP) {

1756

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

1757

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

1758

if(ret == -1){

1759

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1760

}

1761

}

1762

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

1763

if(ret == -1){

1764

perror("close");

1765

}

1766

/* Lower privileges permanently */

1767

errno = 0;

1768

ret = setuid(uid);

1769

if(ret == -1){

1770

perror("setuid");

1771

}

1772

}

1773

}

1774

1775

/* Removes the GPGME temp directory and all files inside */

1302

/* Removes the temp directory used by GPGME */

1776

1303

if(tempdir_created){

1777

struct dirent **direntries = NULL;

1778

struct dirent *direntry = NULL;

1779

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1780

if (ret > 0){

1781

for(int i = 0; i < ret; i++){

1782

direntry = direntries[i];

1304

DIR *d;

1305

struct dirent *direntry;

1306

d = opendir(tempdir);

1307

if(d == NULL){

1308

if(errno != ENOENT){

1309

perror("opendir");

1310

}

1311

} else {

1312

while(true){

1313

direntry = readdir(d);

1314

if(direntry == NULL){

1315

break;

1316

}

1317

/* Skip "." and ".." */

1318

if(direntry->d_name[0] == '.'

1319

and (direntry->d_name[1] == '\0'

1320

or (direntry->d_name[1] == '.'

1321

and direntry->d_name[2] == '\0'))){

1322

continue;

1323

}

1783

1324

char *fullname = NULL;

1784

1325

ret = asprintf(&fullname, "%s/%s", tempdir,

1785

1326

direntry->d_name);

1794

1335

}

1795

1336

free(fullname);

1796

1337

}

1797

}

1798

1799

/* need to be cleaned even if ret == 0 because man page dont specify */

1800

free(direntries);

1801

if (ret == -1){

1802

perror("scandir");

1338

closedir(d);

1803

1339

}

1804

1340

ret = rmdir(tempdir);

1805

1341

if(ret == -1 and errno != ENOENT){

1807

1343

}

1808

1344

}

1809

1345

1810

if(quit_now){

1811

sigemptyset(&old_sigterm_action.sa_mask);

1812

old_sigterm_action.sa_handler = SIG_DFL;

1813

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1814

&old_sigterm_action,

1815

NULL));

1816

if(ret == -1){

1817

perror("sigaction");

1818

}

1819

do {

1820

ret = raise(signal_received);

1821

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

1822

if(ret != 0){

1823

perror("raise");

1824

abort();

1825

}

1826

TEMP_FAILURE_RETRY(pause());

1827

}

1828

1829

1346

return exitcode;

1830

1347

}