/mandos/trunk : revision 24.1.173

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, EXIT_FAILURE,

47

srand(), strtof() */

46

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

47

strtof(), abort() */

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() */

66

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

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(), setuid(),

75

setgid() */

74

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

75

setgid(), pause() */

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, sigaction,

84

sig_atomic_t */

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 */

85

87

86

88

#ifdef __linux__

87

89

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

125

127

static const char mandos_protocol_version[] = "1";

126

128

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

127

129

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;

128

132

129

133

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

130

134

typedef struct {

142

146

.dh_bits = 1024, .priority = "SECURE256"

143

147

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

144

148

149

sig_atomic_t quit_now = 0;

150

int signal_received = 0;

151

145

152

/*

146

153

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

147

154

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

164

171

*/

165

172

static bool init_gpgme(const char *seckey,

166

173

const char *pubkey, const char *tempdir){

167

int ret;

168

174

gpgme_error_t rc;

169

175

gpgme_engine_info_t engine_info;

170

176

173

179

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

174

180

*/

175

181

bool import_key(const char *filename){

182

int ret;

176

183

int fd;

177

184

gpgme_data_t pgp_data;

178

185

249

256

return false;

250

257

}

251

258

252

return true;

259

return true;

253

260

}

254

261

255

262

/*

309

316

}

310

317

gpgme_recipient_t recipient;

311

318

recipient = result->recipients;

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

}

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;

322

327

}

323

328

}

324

329

}

476

481

static int init_gnutls_session(gnutls_session_t *session){

477

482

int ret;

478

483

/* GnuTLS session creation */

479

ret = gnutls_init(session, GNUTLS_SERVER);

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);

480

490

if(ret != GNUTLS_E_SUCCESS){

481

491

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

482

492

safer_gnutls_strerror(ret));

484

494

485

495

{

486

496

const char *err;

487

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

488

504

if(ret != GNUTLS_E_SUCCESS){

489

505

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

490

506

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

494

510

}

495

511

}

496

512

497

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

498

mc.cred);

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);

499

521

if(ret != GNUTLS_E_SUCCESS){

500

522

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

501

523

safer_gnutls_strerror(ret));

504

526

}

505

527

506

528

/* ignore client certificate if any. */

507

gnutls_certificate_server_set_request(*session,

508

GNUTLS_CERT_IGNORE);

529

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

509

530

510

531

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

511

532

520

541

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

521

542

AvahiIfIndex if_index,

522

543

int af){

523

int ret, tcp_sd;

544

int ret, tcp_sd = -1;

524

545

ssize_t sret;

525

546

union {

526

547

struct sockaddr_in in;

527

548

struct sockaddr_in6 in6;

528

549

} to;

529

550

char *buffer = NULL;

530

char *decrypted_buffer;

551

char *decrypted_buffer = NULL;

531

552

size_t buffer_length = 0;

532

553

size_t buffer_capacity = 0;

533

ssize_t decrypted_buffer_size;

534

554

size_t written;

535

int retval = 0;

555

int retval = -1;

536

556

gnutls_session_t session;

537

557

int pf; /* Protocol family */

538

558

559

errno = 0;

560

561

if(quit_now){

562

errno = EINTR;

563

return -1;

564

}

565

539

566

switch(af){

540

567

case AF_INET6:

541

568

pf = PF_INET6;

545

572

break;

546

573

default:

547

574

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

575

errno = EINVAL;

548

576

return -1;

549

577

}

550

578

560

588

561

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

562

590

if(tcp_sd < 0){

591

int e = errno;

563

592

perror("socket");

564

return -1;

593

errno = e;

594

goto mandos_end;

595

}

596

597

if(quit_now){

598

errno = EINTR;

599

goto mandos_end;

565

600

}

566

601

567

602

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

568

603

if(af == AF_INET6){

569

to.in6.sin6_family = (uint16_t)af;

604

to.in6.sin6_family = (sa_family_t)af;

570

605

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

571

606

} else { /* IPv4 */

572

607

to.in.sin_family = (sa_family_t)af;

573

608

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

574

609

}

575

610

if(ret < 0 ){

611

int e = errno;

576

612

perror("inet_pton");

577

return -1;

613

errno = e;

614

goto mandos_end;

578

615

}

579

616

if(ret == 0){

617

int e = errno;

580

618

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

581

return -1;

619

errno = e;

620

goto mandos_end;

582

621

}

583

622

if(af == AF_INET6){

584

623

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

591

630

if(if_index == AVAHI_IF_UNSPEC){

592

631

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

593

632

" without a network interface\n");

594

return -1;

633

errno = EINVAL;

634

goto mandos_end;

595

635

}

596

636

/* Set the network interface number as scope */

597

637

to.in6.sin6_scope_id = (uint32_t)if_index;

602

642

-Wunreachable-code */

603

643

}

604

644

645

if(quit_now){

646

errno = EINTR;

647

goto mandos_end;

648

}

649

605

650

if(debug){

606

651

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

607

652

char interface[IF_NAMESIZE];

634

679

}

635

680

}

636

681

682

if(quit_now){

683

errno = EINTR;

684

goto mandos_end;

685

}

686

637

687

if(af == AF_INET6){

638

688

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

639

689

} else {

640

690

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

641

691

}

642

692

if(ret < 0){

643

perror("connect");

644

return -1;

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;

645

704

}

646

705

647

706

const char *out = mandos_protocol_version;

651

710

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

652

711

out_size - written));

653

712

if(ret == -1){

713

int e = errno;

654

714

perror("write");

655

retval = -1;

715

errno = e;

656

716

goto mandos_end;

657

717

}

658

718

written += (size_t)ret;

666

726

break;

667

727

}

668

728

}

729

730

if(quit_now){

731

errno = EINTR;

732

goto mandos_end;

733

}

669

734

}

670

735

671

736

if(debug){

672

737

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

673

738

}

674

739

740

if(quit_now){

741

errno = EINTR;

742

goto mandos_end;

743

}

744

745

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

675

746

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

676

747

677

do{

748

if(quit_now){

749

errno = EINTR;

750

goto mandos_end;

751

}

752

753

do {

678

754

ret = gnutls_handshake(session);

755

if(quit_now){

756

errno = EINTR;

757

goto mandos_end;

758

}

679

759

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

680

760

681

761

if(ret != GNUTLS_E_SUCCESS){

683

763

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

684

764

gnutls_perror(ret);

685

765

}

686

retval = -1;

766

errno = EPROTO;

687

767

goto mandos_end;

688

768

}

689

769

695

775

}

696

776

697

777

while(true){

778

779

if(quit_now){

780

errno = EINTR;

781

goto mandos_end;

782

}

783

698

784

buffer_capacity = incbuffer(&buffer, buffer_length,

699

785

buffer_capacity);

700

786

if(buffer_capacity == 0){

787

int e = errno;

701

788

perror("incbuffer");

702

retval = -1;

789

errno = e;

790

goto mandos_end;

791

}

792

793

if(quit_now){

794

errno = EINTR;

703

795

goto mandos_end;

704

796

}

705

797

714

806

case GNUTLS_E_AGAIN:

715

807

break;

716

808

case GNUTLS_E_REHANDSHAKE:

717

do{

809

do {

718

810

ret = gnutls_handshake(session);

811

812

if(quit_now){

813

errno = EINTR;

814

goto mandos_end;

815

}

719

816

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

720

817

if(ret < 0){

721

818

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

722

819

gnutls_perror(ret);

723

retval = -1;

820

errno = EPROTO;

724

821

goto mandos_end;

725

822

}

726

823

break;

727

824

default:

728

825

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

729

826

" encrypted session with Mandos server\n");

730

retval = -1;

731

827

gnutls_bye(session, GNUTLS_SHUT_RDWR);

828

errno = EIO;

732

829

goto mandos_end;

733

830

}

734

831

} else {

740

837

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

741

838

}

742

839

743

gnutls_bye(session, GNUTLS_SHUT_RDWR);

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);

744

852

745

853

if(buffer_length > 0){

854

ssize_t decrypted_buffer_size;

746

855

decrypted_buffer_size = pgp_packet_decrypt(buffer,

747

856

buffer_length,

748

857

&decrypted_buffer);

749

858

if(decrypted_buffer_size >= 0){

859

750

860

written = 0;

751

861

while(written < (size_t) decrypted_buffer_size){

862

if(quit_now){

863

errno = EINTR;

864

goto mandos_end;

865

}

866

752

867

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

753

868

(size_t)decrypted_buffer_size - written,

754

869

stdout);

755

870

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

871

int e = errno;

756

872

if(debug){

757

873

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

758

874

strerror(errno));

759

875

}

760

retval = -1;

761

break;

876

errno = e;

877

goto mandos_end;

762

878

}

763

879

written += (size_t)ret;

764

880

}

765

free(decrypted_buffer);

766

} else {

767

retval = -1;

881

retval = 0;

768

882

}

769

} else {

770

retval = -1;

771

883

}

772

884

773

885

/* Shutdown procedure */

774

886

775

887

mandos_end:

776

free(buffer);

777

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

778

if(ret == -1){

779

perror("close");

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;

780

907

}

781

gnutls_deinit(session);

782

908

return retval;

783

909

}

784

910

801

927

/* Called whenever a service has been resolved successfully or

802

928

timed out */

803

929

930

if(quit_now){

931

return;

932

}

933

804

934

switch(event){

805

935

default:

806

936

case AVAHI_RESOLVER_FAILURE:

843

973

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

844

974

is removed from the LAN */

845

975

976

if(quit_now){

977

return;

978

}

979

846

980

switch(event){

847

981

default:

848

982

case AVAHI_BROWSER_FAILURE:

877

1011

}

878

1012

}

879

1013

880

sig_atomic_t quit_now = 0;

881

882

1014

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

883

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

1015

static void handle_sigterm(int sig){

884

1016

if(quit_now){

885

1017

return;

886

1018

}

887

1019

quit_now = 1;

1020

signal_received = sig;

888

1021

int old_errno = errno;

889

1022

if(mc.simple_poll != NULL){

890

1023

avahi_simple_poll_quit(mc.simple_poll);

892

1025

errno = old_errno;

893

1026

}

894

1027

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

895

1144

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

896

1145

AvahiSServiceBrowser *sb = NULL;

897

1146

int error;

899

1148

intmax_t tmpmax;

900

1149

char *tmp;

901

1150

int exitcode = EXIT_SUCCESS;

902

const char *interface = "eth0";

1151

const char *interface = "";

903

1152

struct ifreq network;

904

int sd;

1153

int sd = -1;

1154

bool take_down_interface = false;

905

1155

uid_t uid;

906

1156

gid_t gid;

907

char *connect_to = NULL;

908

1157

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

909

1158

bool tempdir_created = false;

910

1159

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

915

1164

bool gpgme_initialized = false;

916

1165

float delay = 2.5f;

917

1166

918

struct sigaction old_sigterm_action;

1167

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

919

1168

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

920

1169

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

921

1191

{

922

1192

struct argp_option options[] = {

923

1193

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

952

1222

.arg = "SECONDS",

953

1223

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

954

1224

.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 },

955

1234

{ .name = NULL }

956

1235

};

957

1236

958

1237

error_t parse_opt(int key, char *arg,

959

1238

struct argp_state *state){

1239

errno = 0;

960

1240

switch(key){

961

1241

case 128: /* --debug */

962

1242

debug = true;

978

1258

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

979

1259

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

980

1260

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

981

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

982

exit(EXIT_FAILURE);

1261

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

983

1262

}

984

1263

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

985

1264

break;

990

1269

errno = 0;

991

1270

delay = strtof(arg, &tmp);

992

1271

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

993

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

994

exit(EXIT_FAILURE);

1272

argp_error(state, "Bad delay");

995

1273

}

996

1274

break;

997

case ARGP_KEY_ARG:

998

argp_usage(state);

999

case ARGP_KEY_END:

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);

1000

1288

break;

1001

1289

default:

1002

1290

return ARGP_ERR_UNKNOWN;

1003

1291

}

1004

return 0;

1292

return errno;

1005

1293

}

1006

1294

1007

1295

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

1008

1296

.args_doc = "",

1009

1297

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

1010

1298

" passwords from a Mandos server" };

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;

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;

1015

1312

goto end;

1016

1313

}

1017

1314

}

1019

1316

if(not debug){

1020

1317

avahi_set_log_function(empty_log);

1021

1318

}

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

}

1022

1344

1023

1345

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

1024

1346

from the signal handler */

1027

1349

mc.simple_poll = avahi_simple_poll_new();

1028

1350

if(mc.simple_poll == NULL){

1029

1351

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

1030

exitcode = EXIT_FAILURE;

1352

exitcode = EX_UNAVAILABLE;

1031

1353

goto end;

1032

1354

}

1033

1355

1035

1357

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

1036

1358

if(ret == -1){

1037

1359

perror("sigaddset");

1038

exitcode = EXIT_FAILURE;

1360

exitcode = EX_OSERR;

1039

1361

goto end;

1040

1362

}

1041

1363

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

1042

1364

if(ret == -1){

1043

1365

perror("sigaddset");

1044

exitcode = EXIT_FAILURE;

1366

exitcode = EX_OSERR;

1045

1367

goto end;

1046

1368

}

1047

1369

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

1048

1370

if(ret == -1){

1049

1371

perror("sigaddset");

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

}

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

}

1059

1418

1060

1419

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

1061

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

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

1062

1439

#ifdef __linux__

1063

1440

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1064

messages to mess up the prompt */

1441

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

1065

1442

ret = klogctl(8, NULL, 5);

1066

1443

bool restore_loglevel = true;

1067

1444

if(ret == -1){

1073

1450

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1074

1451

if(sd < 0){

1075

1452

perror("socket");

1076

exitcode = EXIT_FAILURE;

1453

exitcode = EX_OSERR;

1077

1454

#ifdef __linux__

1078

1455

if(restore_loglevel){

1079

1456

ret = klogctl(7, NULL, 0);

1082

1459

}

1083

1460

}

1084

1461

#endif /* __linux__ */

1462

/* Lower privileges */

1463

errno = 0;

1464

ret = seteuid(uid);

1465

if(ret == -1){

1466

perror("seteuid");

1467

}

1085

1468

goto end;

1086

1469

}

1087

1470

strcpy(network.ifr_name, interface);

1096

1479

}

1097

1480

}

1098

1481

#endif /* __linux__ */

1099

exitcode = EXIT_FAILURE;

1482

exitcode = EX_OSERR;

1483

/* Lower privileges */

1484

errno = 0;

1485

ret = seteuid(uid);

1486

if(ret == -1){

1487

perror("seteuid");

1488

}

1100

1489

goto end;

1101

1490

}

1102

1491

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

1103

1492

network.ifr_flags |= IFF_UP;

1493

take_down_interface = true;

1104

1494

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

1105

1495

if(ret == -1){

1106

perror("ioctl SIOCSIFFLAGS");

1107

exitcode = EXIT_FAILURE;

1496

take_down_interface = false;

1497

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1498

exitcode = EX_OSERR;

1108

1499

#ifdef __linux__

1109

1500

if(restore_loglevel){

1110

1501

ret = klogctl(7, NULL, 0);

1113

1504

}

1114

1505

}

1115

1506

#endif /* __linux__ */

1507

/* Lower privileges */

1508

errno = 0;

1509

ret = seteuid(uid);

1510

if(ret == -1){

1511

perror("seteuid");

1512

}

1116

1513

goto end;

1117

1514

}

1118

1515

}

1130

1527

perror("nanosleep");

1131

1528

}

1132

1529

}

1133

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

1134

if(ret == -1){

1135

perror("close");

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

}

1136

1536

}

1137

1537

#ifdef __linux__

1138

1538

if(restore_loglevel){

1143

1543

}

1144

1544

}

1145

1545

#endif /* __linux__ */

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");

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;

1160

1565

}

1161

1566

1162

1567

ret = init_gnutls_global(pubkey, seckey);

1163

1568

if(ret == -1){

1164

1569

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

1165

exitcode = EXIT_FAILURE;

1570

exitcode = EX_UNAVAILABLE;

1166

1571

goto end;

1167

1572

} else {

1168

1573

gnutls_initialized = true;

1169

1574

}

1170

1575

1576

if(quit_now){

1577

goto end;

1578

}

1579

1171

1580

if(mkdtemp(tempdir) == NULL){

1172

1581

perror("mkdtemp");

1173

1582

goto end;

1174

1583

}

1175

1584

tempdir_created = true;

1176

1585

1586

if(quit_now){

1587

goto end;

1588

}

1589

1177

1590

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

1178

1591

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

1179

exitcode = EXIT_FAILURE;

1592

exitcode = EX_UNAVAILABLE;

1180

1593

goto end;

1181

1594

} else {

1182

1595

gpgme_initialized = true;

1183

1596

}

1184

1597

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

}

1598

if(quit_now){

1599

goto end;

1192

1600

}

1193

1601

1194

1602

if(connect_to != NULL){

1197

1605

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

1198

1606

if(address == NULL){

1199

1607

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

1200

exitcode = EXIT_FAILURE;

1201

goto end;

1202

}

1608

exitcode = EX_USAGE;

1609

goto end;

1610

}

1611

1612

if(quit_now){

1613

goto end;

1614

}

1615

1203

1616

uint16_t port;

1204

1617

errno = 0;

1205

1618

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

1206

1619

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

1207

1620

or tmpmax != (uint16_t)tmpmax){

1208

1621

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

1209

exitcode = EXIT_FAILURE;

1210

goto end;

1211

}

1622

exitcode = EX_USAGE;

1623

goto end;

1624

}

1625

1626

if(quit_now){

1627

goto end;

1628

}

1629

1212

1630

port = (uint16_t)tmpmax;

1213

1631

*address = '\0';

1214

1632

address = connect_to;

1219

1637

} else {

1220

1638

af = AF_INET;

1221

1639

}

1222

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

1223

if(ret < 0){

1224

exitcode = EXIT_FAILURE;

1225

} else {

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){

1226

1654

exitcode = EXIT_SUCCESS;

1227

1655

}

1228

goto end;

1229

}

1230

1656

1657

goto end;

1658

}

1659

1660

if(quit_now){

1661

goto end;

1662

}

1663

1231

1664

{

1232

1665

AvahiServerConfig config;

1233

1666

/* Do not publish any local Zeroconf records */

1250

1683

if(mc.server == NULL){

1251

1684

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

1252

1685

avahi_strerror(error));

1253

exitcode = EXIT_FAILURE;

1686

exitcode = EX_UNAVAILABLE;

1687

goto end;

1688

}

1689

1690

if(quit_now){

1254

1691

goto end;

1255

1692

}

1256

1693

1261

1698

if(sb == NULL){

1262

1699

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

1263

1700

avahi_strerror(avahi_server_errno(mc.server)));

1264

exitcode = EXIT_FAILURE;

1701

exitcode = EX_UNAVAILABLE;

1702

goto end;

1703

}

1704

1705

if(quit_now){

1265

1706

goto end;

1266

1707

}

1267

1708

1299

1740

gpgme_release(mc.ctx);

1300

1741

}

1301

1742

1302

/* Removes the temp directory used by GPGME */

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 */

1303

1776

if(tempdir_created){

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

}

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];

1324

1783

char *fullname = NULL;

1325

1784

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

1326

1785

direntry->d_name);

1335

1794

}

1336

1795

free(fullname);

1337

1796

}

1338

closedir(d);

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");

1339

1803

}

1340

1804

ret = rmdir(tempdir);

1341

1805

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

1343

1807

}

1344

1808

}

1345

1809

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

1346

1829

return exitcode;

1347

1830

}