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  • Committer: Teddy Hogeborn
  • Date: 2024-11-24 00:44:25 UTC
  • Revision ID: teddy@recompile.se-20241124004425-6k3y0ir1ksyjq3c4
mandos-keygen: Show warning about old OpenSSH versions

When generating a config file snippet on the Mandos client system
using mandos-keygen, and the default ssh-keyscan checker is used, and
if the OpenSSH version is 9.8 or later, the "checker" command
generated for the config file on the Mandos server will include the
"-q" option for ssh-keyscan.  This option did not exist on ssh-keyscan
from OpenSSH older than version 9.8.  Therefore, if the Mandos
*server* is running an older version of OpenSSH, where ssh-keyscan
does not support the "-q" option, this option must be removed from the
generated "checker" setting.  Since we cannot know if this is the case
when running mandos-keygen on the Mandos client system, we print this
information as a comment above the generated "checker" setting.

* mandos-keygen: Show warning if the new "-q" options was used with
  ssh-keyscan in the generated "checker" setting.

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Lines of Context:
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 * "browse_callback", and parts of "main".
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 * 
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 * Everything else is
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 * Copyright © 2008-2020 Teddy Hogeborn
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 * Copyright © 2008-2020 Björn Påhlsson
 
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 * Copyright © 2008-2022 Teddy Hogeborn
 
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 * Copyright © 2008-2022 Björn Påhlsson
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 * 
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 * This file is part of Mandos.
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 * 
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#define _FILE_OFFSET_BITS 64
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#endif  /* not _FILE_OFFSET_BITS */
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#define _GNU_SOURCE             /* TEMP_FAILURE_RETRY(), asprintf() */
42
 
 
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#include <stdio.h>              /* fprintf(), stderr, fwrite(),
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                                   stdout, ferror() */
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#include <stdint.h>             /* uint16_t, uint32_t, intptr_t */
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#include <stddef.h>             /* NULL, size_t, ssize_t */
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#include <stdlib.h>             /* free(), EXIT_SUCCESS, srand(),
48
 
                                   strtof(), abort() */
 
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#define _GNU_SOURCE             /* program_invocation_short_name,
 
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                                   TEMP_FAILURE_RETRY(), O_CLOEXEC,
 
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                                   scandirat(), asprintf() */
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#include <stdbool.h>            /* bool, false, true */
50
 
#include <string.h>             /* strcmp(), strlen(), strerror(),
51
 
                                   asprintf(), strncpy(), strsignal()
52
 
                                */
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#include <sys/ioctl.h>          /* ioctl */
54
 
#include <sys/types.h>          /* socket(), inet_pton(), sockaddr,
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                                   sockaddr_in6, PF_INET6,
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                                   SOCK_STREAM, uid_t, gid_t, open(),
57
 
                                   opendir(), DIR */
58
 
#include <sys/stat.h>           /* open(), S_ISREG */
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#include <sys/socket.h>         /* socket(), struct sockaddr_in6,
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                                   inet_pton(), connect(),
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                                   getnameinfo() */
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#include <fcntl.h>              /* open(), unlinkat(), AT_REMOVEDIR */
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#include <dirent.h>             /* opendir(), struct dirent, readdir()
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                                 */
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#include <inttypes.h>           /* PRIu16, PRIdMAX, intmax_t,
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                                   strtoimax() */
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#include <errno.h>              /* perror(), errno, EINTR, EINVAL,
68
 
                                   EAI_SYSTEM, ENETUNREACH,
 
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#include <argp.h>               /* argp_program_version,
 
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                                   argp_program_bug_address,
 
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                                   struct argp_option,
 
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                                   struct argp_state, argp_error(),
 
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                                   argp_state_help,
 
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                                   ARGP_HELP_STD_HELP,
 
51
                                   ARGP_HELP_EXIT_ERR,
 
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                                   ARGP_HELP_EXIT_OK, ARGP_HELP_USAGE,
 
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                                   argp_err_exit_status,
 
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                                   ARGP_ERR_UNKNOWN, struct argp,
 
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                                   argp_parse(), ARGP_IN_ORDER,
 
56
                                   ARGP_NO_HELP */
 
57
#include <stddef.h>             /* NULL, size_t */
 
58
#include <sys/types.h>          /* uid_t, gid_t, sig_atomic_t,
 
59
                                   seteuid(), setuid(), pid_t,
 
60
                                   setgid(), getuid(), getgid() */
 
61
#include <unistd.h>             /* uid_t, gid_t, TEMP_FAILURE_RETRY(),
 
62
                                   seteuid(), setuid(), close(),
 
63
                                   ssize_t, read(), fork(), setgid(),
 
64
                                   _exit(), dup2(), STDIN_FILENO,
 
65
                                   STDERR_FILENO, STDOUT_FILENO,
 
66
                                   fexecve(), write(), getuid(),
 
67
                                   getgid(), fchown(), symlink(),
 
68
                                   sleep(), unlinkat(), pause() */
 
69
#include <netinet/in.h>         /* in_port_t, struct sockaddr_in6,
 
70
                                   sa_family_t, struct sockaddr_in,
 
71
                                   htons(), IN6_IS_ADDR_LINKLOCAL,
 
72
                                   INET_ADDRSTRLEN, INET6_ADDRSTRLEN,
 
73
                                   ntohl(), IPPROTO_IP */
 
74
#include <time.h>               /* struct timespec, clock_gettime(),
 
75
                                   CLOCK_MONOTONIC, time_t, struct tm,
 
76
                                   gmtime_r(), clock_settime(),
 
77
                                   CLOCK_REALTIME, nanosleep() */
 
78
#include <errno.h>              /* errno,
 
79
                                   program_invocation_short_name,
 
80
                                   EINTR, EINVAL, ENETUNREACH,
69
81
                                   EHOSTUNREACH, ECONNREFUSED, EPROTO,
70
 
                                   EIO, ENOENT, ENXIO, ENOMEM, EISDIR,
71
 
                                   ENOTEMPTY,
72
 
                                   program_invocation_short_name */
73
 
#include <time.h>               /* nanosleep(), time(), sleep() */
74
 
#include <net/if.h>             /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,
75
 
                                   SIOCSIFFLAGS, if_indextoname(),
76
 
                                   if_nametoindex(), IF_NAMESIZE */
77
 
#include <netinet/in.h>         /* IN6_IS_ADDR_LINKLOCAL,
78
 
                                   INET_ADDRSTRLEN, INET6_ADDRSTRLEN
79
 
                                */
80
 
#include <unistd.h>             /* close(), SEEK_SET, off_t, write(),
81
 
                                   getuid(), getgid(), seteuid(),
82
 
                                   setgid(), pause(), _exit(),
83
 
                                   unlinkat(), lstat(), symlink() */
84
 
#include <arpa/inet.h>          /* inet_pton(), htons() */
85
 
#include <iso646.h>             /* not, or, and */
86
 
#include <argp.h>               /* struct argp_option, error_t, struct
87
 
                                   argp_state, struct argp,
88
 
                                   argp_parse(), ARGP_KEY_ARG,
89
 
                                   ARGP_KEY_END, ARGP_ERR_UNKNOWN */
90
 
#include <signal.h>             /* sigemptyset(), sigaddset(),
91
 
                                   sigaction(), SIGTERM, sig_atomic_t,
92
 
                                   raise() */
93
 
#include <sysexits.h>           /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,
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                                   EX_NOHOST, EX_IOERR, EX_PROTOCOL */
 
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                                   EIO, ENOENT, ENXIO, error_t,
 
83
                                   ENOMEM, EISDIR, ENOTEMPTY */
 
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#include <stdio.h>              /* fprintf(), stderr, perror(), FILE,
 
85
                                   vfprintf(), off_t, SEEK_SET,
 
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                                   stdout, fwrite(), ferror(),
 
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                                   fflush(), asprintf() */
 
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#include <stdarg.h>             /* va_list, va_start(), vfprintf() */
 
89
#include <stdlib.h>             /* realloc(), free(), malloc(),
 
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                                   getenv(), EXIT_FAILURE, setenv(),
 
91
                                   EXIT_SUCCESS, strtof(), strtod(),
 
92
                                   srand(), mkdtemp(), abort() */
 
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#include <string.h>             /* strdup(), strcmp(), strlen(),
 
94
                                   strerror(), strncpy(), strspn(),
 
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                                   memcpy(), strrchr(), strchr(),
 
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                                   strsignal() */
 
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#include <fcntl.h>              /* open(), O_RDONLY, O_DIRECTORY,
 
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                                   O_PATH, O_CLOEXEC, openat(),
 
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                                   O_NOFOLLOW, AT_REMOVEDIR */
 
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#include <iso646.h>             /* or, and, not */
 
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#include <sys/stat.h>           /* struct stat, fstat(), fstatat(),
 
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                                   S_ISREG(), S_IXUSR, S_IXGRP,
 
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                                   S_IXOTH, lstat() */
 
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#include <net/if.h>             /* IF_NAMESIZE, if_indextoname(),
 
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                                   if_nametoindex(), SIOCGIFFLAGS,
 
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                                   IFF_LOOPBACK, IFF_POINTOPOINT,
 
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                                   IFF_BROADCAST, IFF_NOARP, IFF_UP,
 
108
                                   IFF_RUNNING, SIOCSIFFLAGS */
 
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#include <sysexits.h>           /* EX_NOPERM, EX_OSERR,
 
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                                   EX_UNAVAILABLE, EX_USAGE */
 
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#include <grp.h>                /* setgroups() */
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112
#include <sys/wait.h>           /* waitpid(), WIFEXITED(),
96
 
                                   WEXITSTATUS(), WTERMSIG() */
97
 
#include <grp.h>                /* setgroups() */
98
 
#include <argz.h>               /* argz_add_sep(), argz_next(),
99
 
                                   argz_delete(), argz_append(),
100
 
                                   argz_stringify(), argz_add(),
101
 
                                   argz_count() */
 
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                                   WEXITSTATUS(), WIFSIGNALED(),
 
114
                                   WTERMSIG() */
 
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#include <signal.h>             /* kill(), SIGTERM, struct sigaction,
 
116
                                   SIG_DFL, sigemptyset(),
 
117
                                   sigaddset(), SIGINT, SIGHUP,
 
118
                                   SIG_IGN, raise() */
 
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#include <sys/socket.h>         /* struct sockaddr_storage, AF_INET6,
 
120
                                   PF_INET6, AF_INET, PF_INET,
 
121
                                   socket(), SOCK_STREAM,
 
122
                                   SOCK_CLOEXEC, struct sockaddr,
 
123
                                   connect(), SOCK_DGRAM */
 
124
#include <argz.h>               /* argz_next(), argz_add_sep(),
 
125
                                   argz_delete(), argz_stringify(),
 
126
                                   argz_add(), argz_count() */
 
127
#include <inttypes.h>           /* PRIuMAX, uintmax_t, uint32_t,
 
128
                                   PRIdMAX, PRIu16, intmax_t,
 
129
                                   strtoimax() */
 
130
#include <arpa/inet.h>          /* inet_pton() */
 
131
#include <stdint.h>             /* uint32_t, intptr_t, uint16_t */
102
132
#include <netdb.h>              /* getnameinfo(), NI_NUMERICHOST,
103
133
                                   EAI_SYSTEM, gai_strerror() */
 
134
#include <sys/ioctl.h>          /* ioctl() */
 
135
#include <dirent.h>             /* struct dirent, scandirat(),
 
136
                                   alphasort(), scandir() */
 
137
#include <limits.h>             /* INT_MAX */
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138
 
105
139
#ifdef __linux__
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#include <sys/klog.h>           /* klogctl() */
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153
 
120
154
/* GnuTLS */
121
155
#include <gnutls/gnutls.h>      /* All GnuTLS types, constants and
122
 
                                   functions:
123
 
                                   gnutls_*
124
 
                                   init_gnutls_session(),
125
 
                                   GNUTLS_* */
 
156
                                   functions: gnutls_*, GNUTLS_* */
126
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#if GNUTLS_VERSION_NUMBER < 0x030600
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158
#include <gnutls/openpgp.h>
128
159
                         /* gnutls_certificate_set_openpgp_key_file(),
129
160
                            GNUTLS_OPENPGP_FMT_BASE64 */
130
161
#elif GNUTLS_VERSION_NUMBER >= 0x030606
131
 
#include <gnutls/x509.h>        /* gnutls_pkcs_encrypt_flags_t,
132
 
                                 GNUTLS_PKCS_PLAIN,
133
 
                                 GNUTLS_PKCS_NULL_PASSWORD */
 
162
#include <gnutls/x509.h>        /* GNUTLS_PKCS_PLAIN,
 
163
                                   GNUTLS_PKCS_NULL_PASSWORD */
134
164
#endif
135
165
 
136
166
/* GPGME */
137
167
#include <gpgme.h>              /* All GPGME types, constants and
138
168
                                   functions:
139
 
                                   gpgme_*
140
 
                                   GPGME_PROTOCOL_OpenPGP,
141
 
                                   GPG_ERR_NO_* */
 
169
                                   gpgme_*, GPG_ERR_NO_*,
 
170
                                   GPGME_IMPORT_*
 
171
                                   GPGME_PROTOCOL_OpenPGP */
142
172
 
143
173
#define BUFFER_SIZE 256
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