/mandos/release : revision 237.7.309

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

46

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

47

strtof(), abort() */

48

#include <stdbool.h> /* bool, false, true */

49

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

50

asprintf(), strncpy() */

49

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

50

strerror(), asprintf(), strcpy() */

51

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

52

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

53

sockaddr_in6, PF_INET6,

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect(),

59

getnameinfo() */

60

#include <fcntl.h> /* open(), unlinkat(), AT_REMOVEDIR */

60

#include <fcntl.h> /* open(), unlinkat() */

61

#include <dirent.h> /* opendir(), struct dirent, readdir()

62

*/

63

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

64

strtoimax() */

65

#include <errno.h> /* perror(), errno, EINTR, EINVAL,

66

EAI_SYSTEM, ENETUNREACH,

67

EHOSTUNREACH, ECONNREFUSED, EPROTO,

68

EIO, ENOENT, ENXIO, ENOMEM, EISDIR,

69

ENOTEMPTY,

65

#include <errno.h> /* perror(), errno,

70

66

program_invocation_short_name */

71

67

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

72

68

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

309

305

return false;

310

306

}

311

307

312

ret = close(fd);

308

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

313

309

if(ret == -1){

314

310

perror_plus("close");

315

311

}

517

513

fprintf_plus(stderr, "GnuTLS: %s", string);

518

514

}

519

515

520

__attribute__((nonnull(1, 2, 4), warn_unused_result))

516

__attribute__((nonnull, warn_unused_result))

521

517

static int init_gnutls_global(const char *pubkeyfilename,

522

518

const char *seckeyfilename,

523

const char *dhparamsfilename,

524

519

mandos_context *mc){

525

520

int ret;

526

521

unsigned int uret;

529

524

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

530

525

}

531

526

527

ret = gnutls_global_init();

528

if(ret != GNUTLS_E_SUCCESS){

529

fprintf_plus(stderr, "GnuTLS global_init: %s\n",

530

safer_gnutls_strerror(ret));

531

return -1;

532

}

533

532

534

if(debug){

533

535

/* "Use a log level over 10 to enable all debugging options."

534

536

* - GnuTLS manual

542

544

if(ret != GNUTLS_E_SUCCESS){

543

545

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

544

546

safer_gnutls_strerror(ret));

547

gnutls_global_deinit();

545

548

return -1;

546

549

}

547

550

572

575

safer_gnutls_strerror(ret));

573

576

goto globalfail;

574

577

}

575

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

576

if(dhparamsfilename != NULL){

577

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

578

do {

579

int dhpfile = open(dhparamsfilename, O_RDONLY);

580

if(dhpfile == -1){

581

perror_plus("open");

582

dhparamsfilename = NULL;

583

break;

584

}

585

size_t params_capacity = 0;

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;

586

585

while(true){

587

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

588

(size_t)params.size,

589

(size_t)params_capacity);

590

if(params_capacity == 0){

586

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

587

(size_t)buffer.size,

588

(size_t)buffer_capacity);

589

if(buffer_capacity == 0){

591

590

perror_plus("incbuffer");

592

free(params.data);

593

params.data = NULL;

594

dhparamsfilename = NULL;

591

free(buffer.data);

592

buffer.data = NULL;

595

593

break;

596

594

}

597

ssize_t bytes_read = read(dhpfile,

598

params.data + params.size,

595

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

599

596

BUFFER_SIZE);

600

597

/* EOF */

601

598

if(bytes_read == 0){

604

601

/* check bytes_read for failure */

605

602

if(bytes_read < 0){

606

603

perror_plus("read");

607

free(params.data);

608

params.data = NULL;

609

dhparamsfilename = NULL;

610

break;

611

}

612

params.size += (unsigned int)bytes_read;

613

}

614

if(params.data == NULL){

615

dhparamsfilename = NULL;

616

}

617

if(dhparamsfilename == NULL){

618

break;

619

}

620

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

621

GNUTLS_X509_FMT_PEM);

622

if(ret != GNUTLS_E_SUCCESS){

623

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

624

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

625

safer_gnutls_strerror(ret));

626

dhparamsfilename = NULL;

627

}

628

} while(false);

629

}

630

if(dhparamsfilename == NULL){

631

if(mc->dh_bits == 0){

632

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

633

/* Try to read the private key file */

634

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

635

do {

636

int secfile = open(seckeyfilename, O_RDONLY);

637

if(secfile == -1){

638

perror_plus("open");

639

break;

640

}

641

size_t buffer_capacity = 0;

642

while(true){

643

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

644

(size_t)buffer.size,

645

(size_t)buffer_capacity);

646

if(buffer_capacity == 0){

647

perror_plus("incbuffer");

648

free(buffer.data);

649

buffer.data = NULL;

650

break;

651

}

652

ssize_t bytes_read = read(secfile,

653

buffer.data + buffer.size,

654

BUFFER_SIZE);

655

/* EOF */

656

if(bytes_read == 0){

657

break;

658

}

659

/* check bytes_read for failure */

660

if(bytes_read < 0){

661

perror_plus("read");

662

free(buffer.data);

663

buffer.data = NULL;

664

break;

665

}

666

buffer.size += (unsigned int)bytes_read;

667

}

668

close(secfile);

669

} while(false);

670

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

671

gnutls_sec_param_t sec_param = GNUTLS_SEC_PARAM_ULTRA;

672

if(buffer.data != NULL){

673

{

674

gnutls_openpgp_privkey_t privkey = NULL;

675

ret = gnutls_openpgp_privkey_init(&privkey);

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);

676

627

if(ret != GNUTLS_E_SUCCESS){

677

fprintf_plus(stderr, "Error initializing OpenPGP key"

678

" structure: %s",

628

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

679

629

safer_gnutls_strerror(ret));

680

free(buffer.data);

681

buffer.data = NULL;

682

} else {

683

ret = gnutls_openpgp_privkey_import

684

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

685

if(ret != GNUTLS_E_SUCCESS){

686

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

687

safer_gnutls_strerror(ret));

688

privkey = NULL;

689

}

690

free(buffer.data);

691

buffer.data = NULL;

692

if(privkey != NULL){

693

/* Use private key to suggest an appropriate

694

sec_param */

695

sec_param = gnutls_openpgp_privkey_sec_param(privkey);

696

gnutls_openpgp_privkey_deinit(privkey);

697

if(debug){

698

fprintf_plus(stderr, "This OpenPGP key implies using"

699

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

700

safe_string(gnutls_sec_param_get_name

701

(sec_param)));

702

}

703

}

630

privkey = NULL;

704

631

}

705

}

706

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

707

/* Err on the side of caution */

708

sec_param = GNUTLS_SEC_PARAM_ULTRA;

709

if(debug){

710

fprintf_plus(stderr, "Falling back to security parameter"

711

" \"%s\"\n",

712

safe_string(gnutls_sec_param_get_name

713

(sec_param)));

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

}

714

644

}

715

645

}

716

646

}

717

uret = gnutls_sec_param_to_pk_bits(GNUTLS_PK_DH, sec_param);

718

if(uret != 0){

719

mc->dh_bits = uret;

647

if(sec_param == GNUTLS_SEC_PARAM_UNKNOWN){

648

/* Err on the side of caution */

649

sec_param = GNUTLS_SEC_PARAM_ULTRA;

720

650

if(debug){

721

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

722

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

651

fprintf_plus(stderr, "Falling back to security parameter"

652

" \"%s\"\n",

723

653

safe_string(gnutls_sec_param_get_name

724

(sec_param)),

725

mc->dh_bits);

654

(sec_param)));

726

655

}

727

} else {

728

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

729

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

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",

730

664

safe_string(gnutls_sec_param_get_name

731

665

(sec_param)),

732

safer_gnutls_strerror(ret));

733

goto globalfail;

666

mc->dh_bits);

734

667

}

735

} else if(debug){

736

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

737

mc->dh_bits);

738

}

739

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

740

if(ret != GNUTLS_E_SUCCESS){

741

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

742

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

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)),

743

672

safer_gnutls_strerror(ret));

744

673

goto globalfail;

745

674

}

746

}

675

} else if(debug){

676

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

677

mc->dh_bits);

678

}

679

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

680

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));

683

goto globalfail;

684

}

685

747

686

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

748

687

749

688

return 0;

751

690

globalfail:

752

691

753

692

gnutls_certificate_free_credentials(mc->cred);

693

gnutls_global_deinit();

754

694

gnutls_dh_params_deinit(mc->dh_params);

755

695

return -1;

756

696

}

808

748

/* ignore client certificate if any. */

809

749

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

810

750

751

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

752

811

753

return 0;

812

754

}

813

755

817

759

818

760

/* Set effective uid to 0, return errno */

819

761

__attribute__((warn_unused_result))

820

int raise_privileges(void){

821

int old_errno = errno;

822

int ret = 0;

762

error_t raise_privileges(void){

763

error_t old_errno = errno;

764

error_t ret_errno = 0;

823

765

if(seteuid(0) == -1){

824

ret = errno;

766

ret_errno = errno;

825

767

}

826

768

errno = old_errno;

827

return ret;

769

return ret_errno;

828

770

}

829

771

830

772

/* Set effective and real user ID to 0. Return errno. */

831

773

__attribute__((warn_unused_result))

832

int raise_privileges_permanently(void){

833

int old_errno = errno;

834

int ret = raise_privileges();

835

if(ret != 0){

774

error_t raise_privileges_permanently(void){

775

error_t old_errno = errno;

776

error_t ret_errno = raise_privileges();

777

if(ret_errno != 0){

836

778

errno = old_errno;

837

return ret;

779

return ret_errno;

838

780

}

839

781

if(setuid(0) == -1){

840

ret = errno;

782

ret_errno = errno;

841

783

}

842

784

errno = old_errno;

843

return ret;

785

return ret_errno;

844

786

}

845

787

846

788

/* Set effective user ID to unprivileged saved user ID */

847

789

__attribute__((warn_unused_result))

848

int lower_privileges(void){

849

int old_errno = errno;

850

int ret = 0;

790

error_t lower_privileges(void){

791

error_t old_errno = errno;

792

error_t ret_errno = 0;

851

793

if(seteuid(uid) == -1){

852

ret = errno;

794

ret_errno = errno;

853

795

}

854

796

errno = old_errno;

855

return ret;

797

return ret_errno;

856

798

}

857

799

858

800

/* Lower privileges permanently */

859

801

__attribute__((warn_unused_result))

860

int lower_privileges_permanently(void){

861

int old_errno = errno;

862

int ret = 0;

802

error_t lower_privileges_permanently(void){

803

error_t old_errno = errno;

804

error_t ret_errno = 0;

863

805

if(setuid(uid) == -1){

864

ret = errno;

806

ret_errno = errno;

865

807

}

866

808

errno = old_errno;

867

return ret;

809

return ret_errno;

868

810

}

869

811

870

812

/* Helper function to add_local_route() and delete_local_route() */

926

868

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

927

869

_exit(EX_OSERR);

928

870

}

929

ret = close(devnull);

871

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

930

872

if(ret == -1){

931

873

perror_plus("close");

932

874

_exit(EX_OSERR);

949

891

helper, O_RDONLY));

950

892

if(helper_fd == -1){

951

893

perror_plus("openat");

952

close(helperdir_fd);

953

894

_exit(EX_UNAVAILABLE);

954

895

}

955

close(helperdir_fd);

896

TEMP_FAILURE_RETRY(close(helperdir_fd));

956

897

#ifdef __GNUC__

957

898

#pragma GCC diagnostic push

958

899

#pragma GCC diagnostic ignored "-Wcast-qual"

1126

1067

goto mandos_end;

1127

1068

}

1128

1069

1070

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

1129

1071

if(af == AF_INET6){

1130

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

1131

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

1132

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

1072

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

1073

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

1133

1074

} else { /* IPv4 */

1134

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

1135

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

1136

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

1075

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

1076

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

1137

1077

}

1138

1078

if(ret < 0 ){

1139

1079

int e = errno;

1218

1158

sizeof(struct sockaddr_in));

1219

1159

}

1220

1160

if(ret < 0){

1221

if(((errno == ENETUNREACH) or (errno == EHOSTUNREACH))

1161

if(errno == ENETUNREACH

1222

1162

and if_index != AVAHI_IF_UNSPEC

1223

1163

and connect_to == NULL

1224

1164

and not route_added and

1462

1402

free(decrypted_buffer);

1463

1403

free(buffer);

1464

1404

if(tcp_sd >= 0){

1465

ret = close(tcp_sd);

1405

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

1466

1406

}

1467

1407

if(ret == -1){

1468

1408

if(e == 0){

1623

1563

__attribute__((nonnull, warn_unused_result))

1624

1564

bool get_flags(const char *ifname, struct ifreq *ifr){

1625

1565

int ret;

1626

int old_errno;

1566

error_t ret_errno;

1627

1567

1628

1568

int s = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1629

1569

if(s < 0){

1630

old_errno = errno;

1570

ret_errno = errno;

1631

1571

perror_plus("socket");

1632

errno = old_errno;

1572

errno = ret_errno;

1633

1573

return false;

1634

1574

}

1635

strncpy(ifr->ifr_name, ifname, IF_NAMESIZE);

1636

ifr->ifr_name[IF_NAMESIZE-1] = '\0'; /* NUL terminate */

1575

strcpy(ifr->ifr_name, ifname);

1637

1576

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1638

1577

if(ret == -1){

1639

1578

if(debug){

1640

old_errno = errno;

1579

ret_errno = errno;

1641

1580

perror_plus("ioctl SIOCGIFFLAGS");

1642

errno = old_errno;

1581

errno = ret_errno;

1643

1582

}

1644

1583

return false;

1645

1584

}

1909

1848

return;

1910

1849

}

1911

1850

}

1851

#ifdef __GLIBC__

1852

#if __GLIBC_PREREQ(2, 15)

1912

1853

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1913

1854

runnable_hook, alphasort);

1855

#else /* not __GLIBC_PREREQ(2, 15) */

1856

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1857

alphasort);

1858

#endif /* not __GLIBC_PREREQ(2, 15) */

1859

#else /* not __GLIBC__ */

1860

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1861

alphasort);

1862

#endif /* not __GLIBC__ */

1914

1863

if(numhooks == -1){

1915

1864

perror_plus("scandir");

1916

1865

return;

1998

1947

perror_plus("openat");

1999

1948

_exit(EXIT_FAILURE);

2000

1949

}

2001

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

1950

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

2002

1951

perror_plus("close");

2003

1952

_exit(EXIT_FAILURE);

2004

1953

}

2007

1956

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

2008

1957

_exit(EX_OSERR);

2009

1958

}

2010

ret = close(devnull);

1959

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

2011

1960

if(ret == -1){

2012

1961

perror_plus("close");

2013

1962

_exit(EX_OSERR);

2062

2011

free(direntry);

2063

2012

}

2064

2013

free(direntries);

2065

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

2014

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

2066

2015

perror_plus("close");

2067

2016

} else {

2068

2017

hookdir_fd = -1;

2071

2020

}

2072

2021

2073

2022

__attribute__((nonnull, warn_unused_result))

2074

int bring_up_interface(const char *const interface,

2075

const float delay){

2076

int old_errno = errno;

2023

error_t bring_up_interface(const char *const interface,

2024

const float delay){

2025

error_t old_errno = errno;

2077

2026

int ret;

2078

2027

struct ifreq network;

2079

2028

unsigned int if_index = if_nametoindex(interface);

2089

2038

}

2090

2039

2091

2040

if(not interface_is_up(interface)){

2092

int ret_errno = 0;

2093

int ioctl_errno = 0;

2041

error_t ret_errno = 0, ioctl_errno = 0;

2094

2042

if(not get_flags(interface, &network)){

2095

2043

ret_errno = errno;

2096

2044

fprintf_plus(stderr, "Failed to get flags for interface "

2109

2057

}

2110

2058

2111

2059

if(quit_now){

2112

ret = close(sd);

2060

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

2113

2061

if(ret == -1){

2114

2062

perror_plus("close");

2115

2063

}

2165

2113

}

2166

2114

2167

2115

/* Close the socket */

2168

ret = close(sd);

2116

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

2169

2117

if(ret == -1){

2170

2118

perror_plus("close");

2171

2119

}

2199

2147

}

2200

2148

2201

2149

__attribute__((nonnull, warn_unused_result))

2202

int take_down_interface(const char *const interface){

2203

int old_errno = errno;

2150

error_t take_down_interface(const char *const interface){

2151

error_t old_errno = errno;

2204

2152

struct ifreq network;

2205

2153

unsigned int if_index = if_nametoindex(interface);

2206

2154

if(if_index == 0){

2209

2157

return ENXIO;

2210

2158

}

2211

2159

if(interface_is_up(interface)){

2212

int ret_errno = 0;

2213

int ioctl_errno = 0;

2160

error_t ret_errno = 0, ioctl_errno = 0;

2214

2161

if(not get_flags(interface, &network) and debug){

2215

2162

ret_errno = errno;

2216

2163

fprintf_plus(stderr, "Failed to get flags for interface "

2254

2201

}

2255

2202

2256

2203

/* Close the socket */

2257

int ret = close(sd);

2204

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

2258

2205

if(ret == -1){

2259

2206

perror_plus("close");

2260

2207

}

2276

2223

2277

2224

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

2278

2225

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

2279

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

2280

":+CTYPE-OPENPGP:!RSA:+SIGN-DSA-SHA256",

2281

.current_server = NULL, .interfaces = NULL,

2282

.interfaces_size = 0 };

2226

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

2227

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

2228

.interfaces = NULL, .interfaces_size = 0 };

2283

2229

AvahiSServiceBrowser *sb = NULL;

2284

2230

error_t ret_errno;

2285

2231

int ret;

2294

2240

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

2295

2241

const char *seckey = PATHDIR "/" SECKEY;

2296

2242

const char *pubkey = PATHDIR "/" PUBKEY;

2297

const char *dh_params_file = NULL;

2298

2243

char *interfaces_hooks = NULL;

2299

2244

2300

2245

bool gnutls_initialized = false;

2353

2298

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

2354

2299

" Diffie-Hellman key exchange",

2355

2300

.group = 2 },

2356

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

2357

.arg = "FILE",

2358

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

2359

" for the Diffie-Hellman key exchange",

2360

.group = 2 },

2361

2301

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

2362

2302

.arg = "STRING",

2363

2303

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

2418

2358

}

2419

2359

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

2420

2360

break;

2421

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

2422

dh_params_file = arg;

2423

break;

2424

2361

case 130: /* --priority */

2425

2362

mc.priority = arg;

2426

2363

break;

2466

2403

.args_doc = "",

2467

2404

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

2468

2405

" passwords from a Mandos server" };

2469

ret_errno = argp_parse(&argp, argc, argv,

2470

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2471

switch(ret_errno){

2406

ret = argp_parse(&argp, argc, argv,

2407

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

2408

switch(ret){

2472

2409

case 0:

2473

2410

break;

2474

2411

case ENOMEM:

2475

2412

default:

2476

errno = ret_errno;

2413

errno = ret;

2477

2414

perror_plus("argp_parse");

2478

2415

exitcode = EX_OSERR;

2479

2416

goto end;

2488

2425

<http://bugs.debian.org/633582> */

2489

2426

2490

2427

/* Re-raise privileges */

2491

ret = raise_privileges();

2492

if(ret != 0){

2493

errno = ret;

2428

ret_errno = raise_privileges();

2429

if(ret_errno != 0){

2430

errno = ret_errno;

2494

2431

perror_plus("Failed to raise privileges");

2495

2432

} else {

2496

2433

struct stat st;

2512

2449

}

2513

2450

}

2514

2451

}

2515

close(seckey_fd);

2452

TEMP_FAILURE_RETRY(close(seckey_fd));

2516

2453

}

2517

2454

}

2518

2455

2533

2470

}

2534

2471

}

2535

2472

}

2536

close(pubkey_fd);

2537

}

2538

}

2539

2540

if(dh_params_file != NULL

2541

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

2542

int dhparams_fd = open(dh_params_file, O_RDONLY);

2543

if(dhparams_fd == -1){

2544

perror_plus("open");

2545

} else {

2546

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

2547

if(ret == -1){

2548

perror_plus("fstat");

2549

} else {

2550

if(S_ISREG(st.st_mode)

2551

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

2552

ret = fchown(dhparams_fd, uid, gid);

2553

if(ret == -1){

2554

perror_plus("fchown");

2555

}

2556

}

2557

}

2558

close(dhparams_fd);

2473

TEMP_FAILURE_RETRY(close(pubkey_fd));

2559

2474

}

2560

2475

}

2561

2476

2562

2477

/* Lower privileges */

2563

ret = lower_privileges();

2564

if(ret != 0){

2565

errno = ret;

2478

ret_errno = lower_privileges();

2479

if(ret_errno != 0){

2480

errno = ret_errno;

2566

2481

perror_plus("Failed to lower privileges");

2567

2482

}

2568

2483

}

2738

2653

errno = bring_up_interface(interface, delay);

2739

2654

if(not interface_was_up){

2740

2655

if(errno != 0){

2741

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

2742

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

2656

perror_plus("Failed to bring up interface");

2743

2657

} else {

2744

2658

errno = argz_add(&interfaces_to_take_down,

2745

2659

&interfaces_to_take_down_size,

2768

2682

goto end;

2769

2683

}

2770

2684

2771

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

2685

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

2772

2686

if(ret == -1){

2773

2687

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

2774

2688

exitcode = EX_UNAVAILABLE;

2896

2810

2897

2811

/* Allocate a new server */

2898

2812

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2899

&config, NULL, NULL, &ret);

2813

&config, NULL, NULL, &ret_errno);

2900

2814

2901

2815

/* Free the Avahi configuration data */

2902

2816

avahi_server_config_free(&config);

2905

2819

/* Check if creating the Avahi server object succeeded */

2906

2820

if(mc.server == NULL){

2907

2821

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

2908

avahi_strerror(ret));

2822

avahi_strerror(ret_errno));

2909

2823

exitcode = EX_UNAVAILABLE;

2910

2824

goto end;

2911

2825

}

2963

2877

2964

2878

if(gnutls_initialized){

2965

2879

gnutls_certificate_free_credentials(mc.cred);

2880

gnutls_global_deinit();

2966

2881

gnutls_dh_params_deinit(mc.dh_params);

2967

2882

}

2968

2883

2991

2906

2992

2907

/* Re-raise privileges */

2993

2908

{

2994

ret = raise_privileges();

2995

if(ret != 0){

2996

errno = ret;

2909

ret_errno = raise_privileges();

2910

if(ret_errno != 0){

2911

errno = ret_errno;

2997

2912

perror_plus("Failed to raise privileges");

2998

2913

} else {

2999

2914

3007

2922

while((interface=argz_next(interfaces_to_take_down,

3008

2923

interfaces_to_take_down_size,

3009

2924

interface))){

3010

ret = take_down_interface(interface);

3011

if(ret != 0){

3012

errno = ret;

2925

ret_errno = take_down_interface(interface);

2926

if(ret_errno != 0){

2927

errno = ret_errno;

3013

2928

perror_plus("Failed to take down interface");

3014

2929

}

3015

2930

}

3020

2935

}

3021

2936

}

3022

2937

3023

ret = lower_privileges_permanently();

3024

if(ret != 0){

3025

errno = ret;

2938

ret_errno = lower_privileges_permanently();

2939

if(ret_errno != 0){

2940

errno = ret_errno;

3026

2941

perror_plus("Failed to lower privileges permanently");

3027

2942

}

3028

2943

}

3030

2945

free(interfaces_to_take_down);

3031

2946

free(interfaces_hooks);

3032

2947

3033

void clean_dir_at(int base, const char * const dirname,

3034

uintmax_t level){

3035

struct dirent **direntries = NULL;

3036

int dret;

3037

int dir_fd = (int)TEMP_FAILURE_RETRY(openat(base, dirname,

3038

O_RDONLY

3039

| O_NOFOLLOW

3040

| O_DIRECTORY

3041

| O_PATH));

3042

if(dir_fd == -1){

3043

perror_plus("open");

3044

}

3045

int numentries = scandirat(dir_fd, ".", &direntries,

3046

notdotentries, alphasort);

3047

if(numentries >= 0){

3048

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

3049

if(debug){

3050

fprintf_plus(stderr, "Unlinking \"%s/%s\"\n",

3051

dirname, direntries[i]->d_name);

3052

}

3053

dret = unlinkat(dir_fd, direntries[i]->d_name, 0);

3054

if(dret == -1){

3055

if(errno == EISDIR){

3056

dret = unlinkat(dir_fd, direntries[i]->d_name,

3057

AT_REMOVEDIR);

3058

}

3059

if((dret == -1) and (errno == ENOTEMPTY)

3060

and (strcmp(direntries[i]->d_name, "private-keys-v1.d")

3061

== 0) and (level == 0)){

3062

/* Recurse only in this special case */

3063

clean_dir_at(dir_fd, direntries[i]->d_name, level+1);

3064

dret = 0;

3065

}

3066

if(dret == -1){

3067

fprintf_plus(stderr, "unlink(\"%s/%s\"): %s\n", dirname,

3068

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

3069

}

3070

}

3071

free(direntries[i]);

3072

}

3073

3074

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

3075

free(direntries);

3076

if(numentries == -1){

3077

perror_plus("scandirat");

3078

}

3079

dret = unlinkat(base, dirname, AT_REMOVEDIR);

3080

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

3081

perror_plus("rmdir");

3082

}

3083

} else {

3084

perror_plus("scandirat");

3085

}

3086

close(dir_fd);

3087

}

3088

3089

2948

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

3090

2949

if(tempdir != NULL){

3091

clean_dir_at(-1, tempdir, 0);

2950

struct dirent **direntries = NULL;

2951

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY

2952

| O_NOFOLLOW

2953

| O_DIRECTORY

2954

| O_PATH));

2955

if(tempdir_fd == -1){

2956

perror_plus("open");

2957

} else {

2958

#ifdef __GLIBC__

2959

#if __GLIBC_PREREQ(2, 15)

2960

int numentries = scandirat(tempdir_fd, ".", &direntries,

2961

notdotentries, alphasort);

2962

#else /* not __GLIBC_PREREQ(2, 15) */

2963

int numentries = scandir(tempdir, &direntries, notdotentries,

2964

alphasort);

2965

#endif /* not __GLIBC_PREREQ(2, 15) */

2966

#else /* not __GLIBC__ */

2967

int numentries = scandir(tempdir, &direntries, notdotentries,

2968

alphasort);

2969

#endif /* not __GLIBC__ */

2970

if(numentries >= 0){

2971

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

2972

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2973

if(ret == -1){

2974

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2975

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

2976

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

2977

}

2978

free(direntries[i]);

2979

}

2980

2981

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

2982

free(direntries);

2983

if(numentries == -1){

2984

perror_plus("scandir");

2985

}

2986

ret = rmdir(tempdir);

2987

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

2988

perror_plus("rmdir");

2989

}

2990

}

2991

TEMP_FAILURE_RETRY(close(tempdir_fd));

2992

}

3092

2993

}

3093

2994

3094

2995

if(quit_now){