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Viewing changes to plugins.d/mandos-client.c

Committer: Teddy Hogeborn
Date: 2014-06-22 02:19:30 UTC
Revision ID: teddy@recompile.se-20140622021930-icl7h4cm97blhjml

mandos-keygen: Generate "checker" option to use SSH fingerprints.

To turn this off, use a new "--no-ssh" option to mandos-keygen.

* INSTALL (Mandos Server, Mandos Client): Document new suggested
                                          installation of SSH.
* Makefile (confdir/clients.conf): Use new "--no-ssh" option to
                                   "mandos-keygen".
* debian/control (mandos/Depends): Changed to "fping | ssh-client".
  (mandos-client/Recommends): New; set to "ssh".
* intro.xml (FREQUENTLY ASKED QUESTIONS): Rename and rewrite section
                                          called "Faking ping
                                          replies?" to address new
                                          default behavior.
* mandos-clients.conf.xml (OPTIONS/checker): Briefly discuss new
                                             behavior of
                                             mandos-keygen.
* mandos-keygen: Bug fix: Suppress failure output of "shred" to remove
                 "sec*", since no such files may exist.
(password mode): Scan for SSH key fingerprints and output as new
                  "checker" and "ssh_fingerprint" options, unless new
                  "--no-ssh" option is given.
* mandos-keygen.xml (SYNOPSIS/--force): Bug fix: Document short form.
  (OPTIONS/--no-ssh): New.
  (SEE ALSO): Add reference "ssh-keyscan(1)".
* plugins.d/mandos-client.xml (SECURITY): Briefly mention the
                                          possibility of using SSH key
                                          fingerprints for checking.

Show diffs side-by-side

added added

removed removed

plugins.d/mandos-client.c

234

.af = af };

235

if(new_server->ip == NULL){

236

perror_plus("strdup");

237

free(new_server);

238

237

return false;

239

238

}

240

239

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

241

240

if(ret == -1){

242

241

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

242

return false;

253

243

}

254

244

/* Special case of first server */

493

483

return plaintext_length;

494

484

}

495

485

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

503

486

__attribute__((warn_unused_result))

504

487

static const char *safer_gnutls_strerror(int value){

505

488

const char *ret = gnutls_strerror(value);

506

return safe_string(ret);

489

if(ret == NULL)

490

ret = "(unknown)";

491

return ret;

507

492

}

508

493

509

494

/* GnuTLS log function callback */

518

503

const char *seckeyfilename,

519

504

mandos_context *mc){

520

505

int ret;

521

unsigned int uret;

522

506

523

507

if(debug){

524

508

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

575

559

safer_gnutls_strerror(ret));

576

560

goto globalfail;

577

561

}

578

if(mc->dh_bits == 0){

579

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

580

/* Try to read the private key file */

581

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

582

{

583

int secfile = open(seckeyfilename, O_RDONLY);

584

size_t buffer_capacity = 0;

585

while(true){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

590

perror_plus("incbuffer");

591

free(buffer.data);

592

buffer.data = NULL;

593

break;

594

}

595

ssize_t bytes_read = read(secfile, buffer.data + buffer.size,

596

BUFFER_SIZE);

597

/* EOF */

598

if(bytes_read == 0){

599

break;

600

}

601

/* check bytes_read for failure */

602

if(bytes_read < 0){

603

perror_plus("read");

604

free(buffer.data);

605

buffer.data = NULL;

606

break;

607

}

608

buffer.size += (unsigned int)bytes_read;

609

}

610

close(secfile);

611

}

612

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

613

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

614

if(buffer.data != NULL){

615

{

616

gnutls_openpgp_privkey_t privkey = NULL;

617

ret = gnutls_openpgp_privkey_init(&privkey);

618

if(ret != GNUTLS_E_SUCCESS){

619

fprintf_plus(stderr, "Error initializing OpenPGP key"

620

" structure: %s", safer_gnutls_strerror(ret));

621

free(buffer.data);

622

buffer.data = NULL;

623

} else {

624

ret = gnutls_openpgp_privkey_import(privkey, &buffer,

625

GNUTLS_OPENPGP_FMT_BASE64,

626

"", 0);

627

if(ret != GNUTLS_E_SUCCESS){

628

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

629

safer_gnutls_strerror(ret));

630

privkey = NULL;

631

}

632

free(buffer.data);

633

buffer.data = NULL;

634

if(privkey != NULL){

635

/* Use private key to suggest an appropriate sec_param */

636

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

637

gnutls_openpgp_privkey_deinit(privkey);

638

if(debug){

639

fprintf_plus(stderr, "This OpenPGP key implies using a"

640

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

641

safe_string(gnutls_sec_param_get_name

642

(sec_param)));

643

}

644

}

645

}

646

}

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

650

if(debug){

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

653

safe_string(gnutls_sec_param_get_name

654

(sec_param)));

655

}

656

}

657

}

658

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

659

if(uret != 0){

660

mc->dh_bits = uret;

661

if(debug){

662

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

663

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

664

safe_string(gnutls_sec_param_get_name

665

(sec_param)),

666

mc->dh_bits);

667

}

668

} else {

669

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

670

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

671

safe_string(gnutls_sec_param_get_name(sec_param)),

672

safer_gnutls_strerror(ret));

673

goto globalfail;

674

}

675

} else if(debug){

676

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

677

mc->dh_bits);

678

}

679

562

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

680

563

if(ret != GNUTLS_E_SUCCESS){

681

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

682

" %s\n", mc->dh_bits, safer_gnutls_strerror(ret));

564

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

565

safer_gnutls_strerror(ret));

683

566

goto globalfail;

684

567

}

685

568

1183

1066

timed out */

1184

1067

1185

1068

if(quit_now){

1186

avahi_s_service_resolver_free(r);

1187

1069

return;

1188

1070

}

1189

1071

1757

1639

_exit(EXIT_FAILURE);

1758

1640

}

1759

1641

} else {

1760

if(hook_pid == -1){

1761

perror_plus("fork");

1762

free(direntry);

1763

continue;

1764

}

1765

1642

int status;

1766

1643

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1767

1644

perror_plus("waitpid");

1768

free(direntry);

1769

1645

continue;

1770

1646

}

1771

1647

if(WIFEXITED(status)){

1773

1649

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1774

1650

" with status %d\n", direntry->d_name,

1775

1651

WEXITSTATUS(status));

1776

free(direntry);

1777

1652

continue;

1778

1653

}

1779

1654

} else if(WIFSIGNALED(status)){

1780

1655

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1781

1656

" signal %d\n", direntry->d_name,

1782

1657

WTERMSIG(status));

1783

free(direntry);

1784

1658

continue;

1785

1659

} else {

1786

1660

fprintf_plus(stderr, "Warning: network hook \"%s\""

1787

1661

" crashed\n", direntry->d_name);

1788

free(direntry);

1789

1662

continue;

1790

1663

}

1791

1664

}

1793

1666

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1794

1667

direntry->d_name);

1795

1668

}

1796

free(direntry);

1797

1669

}

1798

1670

free(direntries);

1799

1671

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

2007

1879

}

2008

1880

2009

1881

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

2010

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

1882

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

2011

1883

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

2012

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

1884

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

2013

1885

.interfaces = NULL, .interfaces_size = 0 };

2014

1886

AvahiSServiceBrowser *sb = NULL;

2015

1887

error_t ret_errno;

2393

2265

if(ret_errno != 0){

2394

2266

errno = ret_errno;

2395

2267

perror_plus("argz_add");

2396

free(direntries[i]);

2397

2268

continue;

2398

2269

}

2399

2270

if(debug){

2400

2271

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2401

2272

direntries[i]->d_name);

2402

2273

}

2403

free(direntries[i]);

2404

2274

}

2405

2275

free(direntries);

2406

2276

} else {

2676

2546

mc.current_server->prev->next = NULL;

2677

2547

while(mc.current_server != NULL){

2678

2548

server *next = mc.current_server->next;

2679

#ifdef __GNUC__

2680

#pragma GCC diagnostic push

2681

#pragma GCC diagnostic ignored "-Wcast-qual"

2682

#endif

2683

free((char *)(mc.current_server->ip));

2684

#ifdef __GNUC__

2685

#pragma GCC diagnostic pop

2686

#endif

2687

2549

free(mc.current_server);

2688

2550

mc.current_server = next;

2689

2551

}

2758

2620

" \"%s\", 0): %s\n", tempdir,

2759

2621

direntries[i]->d_name, strerror(errno));

2760

2622

}

2761

free(direntries[i]);

2762

2623

}

2763

2624

2764

2625

/* need to clean even if 0 because man page doesn't specify */

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