/mandos/trunk : revision 774

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() */

49

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

50

asprintf(), strcpy() */

51

#include <sys/ioctl.h> /* ioctl */

52

#include <sys/types.h> /* socket(), inet_pton(), sockaddr,

53

sockaddr_in6, PF_INET6,

305

return false;

306

}

307

308

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

308

ret = close(fd);

309

if(ret == -1){

310

perror_plus("close");

311

}

493

return plaintext_length;

494

}

495

496

__attribute__((warn_unused_result, const))

497

static const char *safe_string(const char *str){

498

if(str == NULL)

499

return "(unknown)";

500

return str;

501

}

502

496

503

__attribute__((warn_unused_result))

497

504

static const char *safer_gnutls_strerror(int value){

498

505

const char *ret = gnutls_strerror(value);

499

if(ret == NULL)

500

ret = "(unknown)";

501

return ret;

506

return safe_string(ret);

502

507

}

503

508

504

509

/* GnuTLS log function callback */

511

516

__attribute__((nonnull, warn_unused_result))

512

517

static int init_gnutls_global(const char *pubkeyfilename,

513

518

const char *seckeyfilename,

519

const char *dhparamsfilename,

514

520

mandos_context *mc){

515

521

int ret;

522

unsigned int uret;

516

523

517

524

if(debug){

518

525

fprintf_plus(stderr, "Initializing GnuTLS\n");

569

576

safer_gnutls_strerror(ret));

570

577

goto globalfail;

571

578

}

572

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

573

if(ret != GNUTLS_E_SUCCESS){

574

fprintf_plus(stderr, "Error in GnuTLS prime generation: %s\n",

575

safer_gnutls_strerror(ret));

576

goto globalfail;

577

}

578

579

/* If a Diffie-Hellman parameters file was given, try to use it */

580

if(dhparamsfilename != NULL){

581

gnutls_datum_t params = { .data = NULL, .size = 0 };

582

do {

583

int dhpfile = open(dhparamsfilename, O_RDONLY);

584

if(dhpfile == -1){

585

perror_plus("open");

586

dhparamsfilename = NULL;

587

break;

588

}

589

size_t params_capacity = 0;

590

while(true){

591

params_capacity = incbuffer((char **)&params.data,

592

(size_t)params.size,

593

(size_t)params_capacity);

594

if(params_capacity == 0){

595

perror_plus("incbuffer");

596

free(params.data);

597

params.data = NULL;

598

dhparamsfilename = NULL;

599

break;

600

}

601

ssize_t bytes_read = read(dhpfile,

602

params.data + params.size,

603

BUFFER_SIZE);

604

/* EOF */

605

if(bytes_read == 0){

606

break;

607

}

608

/* check bytes_read for failure */

609

if(bytes_read < 0){

610

perror_plus("read");

611

free(params.data);

612

params.data = NULL;

613

dhparamsfilename = NULL;

614

break;

615

}

616

params.size += (unsigned int)bytes_read;

617

}

618

if(params.data == NULL){

619

dhparamsfilename = NULL;

620

}

621

if(dhparamsfilename == NULL){

622

break;

623

}

624

ret = gnutls_dh_params_import_pkcs3(mc->dh_params, &params,

625

GNUTLS_X509_FMT_PEM);

626

if(ret != GNUTLS_E_SUCCESS){

627

fprintf_plus(stderr, "Failed to parse DH parameters in file"

628

" \"%s\": %s\n", dhparamsfilename,

629

safer_gnutls_strerror(ret));

630

dhparamsfilename = NULL;

631

}

632

} while(false);

633

}

634

if(dhparamsfilename == NULL){

635

if(mc->dh_bits == 0){

636

/* Find out the optimal number of DH bits */

637

/* Try to read the private key file */

638

gnutls_datum_t buffer = { .data = NULL, .size = 0 };

639

do {

640

int secfile = open(seckeyfilename, O_RDONLY);

641

if(secfile == -1){

642

perror_plus("open");

643

break;

644

}

645

size_t buffer_capacity = 0;

646

while(true){

647

buffer_capacity = incbuffer((char **)&buffer.data,

648

(size_t)buffer.size,

649

(size_t)buffer_capacity);

650

if(buffer_capacity == 0){

651

perror_plus("incbuffer");

652

free(buffer.data);

653

buffer.data = NULL;

654

break;

655

}

656

ssize_t bytes_read = read(secfile,

657

buffer.data + buffer.size,

658

BUFFER_SIZE);

659

/* EOF */

660

if(bytes_read == 0){

661

break;

662

}

663

/* check bytes_read for failure */

664

if(bytes_read < 0){

665

perror_plus("read");

666

free(buffer.data);

667

buffer.data = NULL;

668

break;

669

}

670

buffer.size += (unsigned int)bytes_read;

671

}

672

close(secfile);

673

} while(false);

674

/* If successful, use buffer to parse private key */

675

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

676

if(buffer.data != NULL){

677

{

678

gnutls_openpgp_privkey_t privkey = NULL;

679

ret = gnutls_openpgp_privkey_init(&privkey);

680

if(ret != GNUTLS_E_SUCCESS){

681

fprintf_plus(stderr, "Error initializing OpenPGP key"

682

" structure: %s",

683

safer_gnutls_strerror(ret));

684

free(buffer.data);

685

buffer.data = NULL;

686

} else {

687

ret = gnutls_openpgp_privkey_import

688

(privkey, &buffer, GNUTLS_OPENPGP_FMT_BASE64, "", 0);

689

if(ret != GNUTLS_E_SUCCESS){

690

fprintf_plus(stderr, "Error importing OpenPGP key : %s",

691

safer_gnutls_strerror(ret));

692

privkey = NULL;

693

}

694

free(buffer.data);

695

buffer.data = NULL;

696

if(privkey != NULL){

697

/* Use private key to suggest an appropriate

698

sec_param */

699

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

700

gnutls_openpgp_privkey_deinit(privkey);

701

if(debug){

702

fprintf_plus(stderr, "This OpenPGP key implies using"

703

" a GnuTLS security parameter \"%s\".\n",

704

safe_string(gnutls_sec_param_get_name

705

(sec_param)));

706

}

707

}

708

}

709

}

710

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

711

/* Err on the side of caution */

712

sec_param = GNUTLS_SEC_PARAM_ULTRA;

713

if(debug){

714

fprintf_plus(stderr, "Falling back to security parameter"

715

" \"%s\"\n",

716

safe_string(gnutls_sec_param_get_name

717

(sec_param)));

718

}

719

}

720

}

721

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

722

if(uret != 0){

723

mc->dh_bits = uret;

724

if(debug){

725

fprintf_plus(stderr, "A \"%s\" GnuTLS security parameter"

726

" implies %u DH bits; using that.\n",

727

safe_string(gnutls_sec_param_get_name

728

(sec_param)),

729

mc->dh_bits);

730

}

731

} else {

732

fprintf_plus(stderr, "Failed to get implied number of DH"

733

" bits for security parameter \"%s\"): %s\n",

734

safe_string(gnutls_sec_param_get_name

735

(sec_param)),

736

safer_gnutls_strerror(ret));

737

goto globalfail;

738

}

739

} else if(debug){

740

fprintf_plus(stderr, "DH bits explicitly set to %u\n",

741

mc->dh_bits);

742

}

743

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

744

if(ret != GNUTLS_E_SUCCESS){

745

fprintf_plus(stderr, "Error in GnuTLS prime generation (%u"

746

" bits): %s\n", mc->dh_bits,

747

safer_gnutls_strerror(ret));

748

goto globalfail;

749

}

750

}

579

751

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

580

752

581

753

return 0;

641

813

/* ignore client certificate if any. */

642

814

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

643

815

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

645

646

816

return 0;

647

817

}

648

818

761

931

perror_plus("dup2(devnull, STDIN_FILENO)");

762

932

_exit(EX_OSERR);

763

933

}

764

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

934

ret = close(devnull);

765

935

if(ret == -1){

766

936

perror_plus("close");

767

937

_exit(EX_OSERR);

786

956

perror_plus("openat");

787

957

_exit(EX_UNAVAILABLE);

788

958

}

789

TEMP_FAILURE_RETRY(close(helperdir_fd));

959

close(helperdir_fd);

790

960

#ifdef __GNUC__

791

961

#pragma GCC diagnostic push

792

962

#pragma GCC diagnostic ignored "-Wcast-qual"

960

1130

goto mandos_end;

961

1131

}

962

1132

963

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

964

1133

if(af == AF_INET6){

965

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

966

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

1134

struct sockaddr_in6 *to6 = (struct sockaddr_in6 *)&to;

1135

*to6 = (struct sockaddr_in6){ .sin6_family = (sa_family_t)af };

1136

ret = inet_pton(af, ip, &to6->sin6_addr);

967

1137

} else { /* IPv4 */

968

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

969

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

1138

struct sockaddr_in *to4 = (struct sockaddr_in *)&to;

1139

*to4 = (struct sockaddr_in){ .sin_family = (sa_family_t)af };

1140

ret = inet_pton(af, ip, &to4->sin_addr);

970

1141

}

971

1142

if(ret < 0 ){

972

1143

int e = errno;

1295

1466

free(decrypted_buffer);

1296

1467

free(buffer);

1297

1468

if(tcp_sd >= 0){

1298

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

1469

ret = close(tcp_sd);

1299

1470

}

1300

1471

if(ret == -1){

1301

1472

if(e == 0){

1840

2011

perror_plus("openat");

1841

2012

_exit(EXIT_FAILURE);

1842

2013

}

1843

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

2014

if(close(hookdir_fd) == -1){

1844

2015

perror_plus("close");

1845

2016

_exit(EXIT_FAILURE);

1846

2017

}

1849

2020

perror_plus("dup2(devnull, STDIN_FILENO)");

1850

2021

_exit(EX_OSERR);

1851

2022

}

1852

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

2023

ret = close(devnull);

1853

2024

if(ret == -1){

1854

2025

perror_plus("close");

1855

2026

_exit(EX_OSERR);

1904

2075

free(direntry);

1905

2076

}

1906

2077

free(direntries);

1907

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

2078

if(close(hookdir_fd) == -1){

1908

2079

perror_plus("close");

1909

2080

} else {

1910

2081

hookdir_fd = -1;

1950

2121

}

1951

2122

1952

2123

if(quit_now){

1953

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

2124

ret = close(sd);

1954

2125

if(ret == -1){

1955

2126

perror_plus("close");

1956

2127

}

2006

2177

}

2007

2178

2008

2179

/* Close the socket */

2009

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

2180

ret = close(sd);

2010

2181

if(ret == -1){

2011

2182

perror_plus("close");

2012

2183

}

2094

2265

}

2095

2266

2096

2267

/* Close the socket */

2097

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

2268

int ret = close(sd);

2098

2269

if(ret == -1){

2099

2270

perror_plus("close");

2100

2271

}

2115

2286

}

2116

2287

2117

2288

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

2118

mandos_context mc = { .server = NULL, .dh_bits = 1024,

2289

mandos_context mc = { .server = NULL, .dh_bits = 0,

2119

2290

.priority = "SECURE256:!CTYPE-X.509:"

2120

"+CTYPE-OPENPGP", .current_server = NULL,

2291

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

2121

2292

.interfaces = NULL, .interfaces_size = 0 };

2122

2293

AvahiSServiceBrowser *sb = NULL;

2123

2294

error_t ret_errno;

2133

2304

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2134

2305

const char *seckey = PATHDIR "/" SECKEY;

2135

2306

const char *pubkey = PATHDIR "/" PUBKEY;

2307

const char *dh_params_file = NULL;

2136

2308

char *interfaces_hooks = NULL;

2137

2309

2138

2310

bool gnutls_initialized = false;

2191

2363

.doc = "Bit length of the prime number used in the"

2192

2364

" Diffie-Hellman key exchange",

2193

2365

.group = 2 },

2366

{ .name = "dh-params", .key = 134,

2367

.arg = "FILE",

2368

.doc = "PEM-encoded PKCS#3 file with pre-generated parameters"

2369

" for the Diffie-Hellman key exchange",

2370

.group = 2 },

2194

2371

{ .name = "priority", .key = 130,

2195

2372

.arg = "STRING",

2196

2373

.doc = "GnuTLS priority string for the TLS handshake",

2251

2428

}

2252

2429

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

2253

2430

break;

2431

case 134: /* --dh-params */

2432

dh_params_file = arg;

2433

break;

2254

2434

case 130: /* --priority */

2255

2435

mc.priority = arg;

2256

2436

break;

2342

2522

}

2343

2523

}

2344

2524

}

2345

TEMP_FAILURE_RETRY(close(seckey_fd));

2525

close(seckey_fd);

2346

2526

}

2347

2527

}

2348

2528

2363

2543

}

2364

2544

}

2365

2545

}

2366

TEMP_FAILURE_RETRY(close(pubkey_fd));

2546

close(pubkey_fd);

2547

}

2548

}

2549

2550

if(strcmp(dh_params_file, PATHDIR "/dhparams.pem" ) == 0){

2551

int dhparams_fd = open(dh_params_file, O_RDONLY);

2552

if(dhparams_fd == -1){

2553

perror_plus("open");

2554

} else {

2555

ret = (int)TEMP_FAILURE_RETRY(fstat(dhparams_fd, &st));

2556

if(ret == -1){

2557

perror_plus("fstat");

2558

} else {

2559

if(S_ISREG(st.st_mode)

2560

and st.st_uid == 0 and st.st_gid == 0){

2561

ret = fchown(dhparams_fd, uid, gid);

2562

if(ret == -1){

2563

perror_plus("fchown");

2564

}

2565

}

2566

}

2567

close(dhparams_fd);

2367

2568

}

2368

2569

}

2369

2570

2546

2747

errno = bring_up_interface(interface, delay);

2547

2748

if(not interface_was_up){

2548

2749

if(errno != 0){

2549

perror_plus("Failed to bring up interface");

2750

fprintf_plus(stderr, "Failed to bring up interface \"%s\":"

2751

" %s\n", interface, strerror(errno));

2550

2752

} else {

2551

2753

errno = argz_add(&interfaces_to_take_down,

2552

2754

&interfaces_to_take_down_size,

2575

2777

goto end;

2576

2778

}

2577

2779

2578

ret = init_gnutls_global(pubkey, seckey, &mc);

2780

ret = init_gnutls_global(pubkey, seckey, dh_params_file, &mc);

2579

2781

if(ret == -1){

2580

2782

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

2581

2783

exitcode = EX_UNAVAILABLE;

2881

3083

perror_plus("rmdir");

2882

3084

}

2883

3085

}

2884

TEMP_FAILURE_RETRY(close(tempdir_fd));

3086

close(tempdir_fd);

2885

3087

}

2886

3088

}

2887

3089