4 * Copyright (C) 2003 Paul Jakma.
5 * Copyright (c) 2005, 2011, Oracle and/or its affiliates. All rights reserved.
7 * This file is part of GNU Zebra.
9 * GNU Zebra is free software; you can redistribute it and/or modify it
10 * under the terms of the GNU General Public License as published by the
11 * Free Software Foundation; either version 2, or (at your option) any
14 * GNU Zebra is distributed in the hope that it will be useful, but
15 * WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
17 * General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with GNU Zebra; see the file COPYING. If not, write to the Free
21 * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
29 #ifdef HAVE_CAPABILITIES
30 /* sort out some generic internal types for:
32 * privilege values (cap_value_t, priv_t) -> pvalue_t
33 * privilege set (..., priv_set_t) -> pset_t
34 * privilege working storage (cap_t, ...) -> pstorage_t
36 * values we think of as numeric (they're ints really, but we dont know)
37 * sets are mostly opaque, to hold a set of privileges, related in some way.
38 * storage binds together a set of sets we're interested in.
39 * (in reality: cap_value_t and priv_t are ints)
42 /* Linux doesn't have a 'set' type: a set of related privileges */
47 typedef cap_value_t pvalue_t
;
48 typedef struct _pset pset_t
;
49 typedef cap_t pstorage_t
;
51 #elif defined (HAVE_SOLARIS_CAPABILITIES)
52 typedef priv_t pvalue_t
;
53 typedef priv_set_t pset_t
;
54 typedef priv_set_t
*pstorage_t
;
55 #else /* neither LCAPS nor SOLARIS_CAPABILITIES */
56 #error "HAVE_CAPABILITIES defined, but neither LCAPS nor Solaris Capabilties!"
57 #endif /* HAVE_LCAPS */
58 #endif /* HAVE_CAPABILITIES */
60 /* the default NULL state we report is RAISED, but could be LOWERED if
61 * zprivs_terminate is called and the NULL handler is installed.
63 static zebra_privs_current_t zprivs_null_state
= ZPRIVS_RAISED
;
65 /* internal privileges state */
66 static struct _zprivs_t
68 #ifdef HAVE_CAPABILITIES
69 pstorage_t caps
; /* working storage */
70 pset_t
*syscaps_p
; /* system-type requested permitted caps */
71 pset_t
*syscaps_i
; /* system-type requested inheritable caps */
72 #endif /* HAVE_CAPABILITIES */
73 uid_t zuid
, /* uid to run as */
74 zsuid
; /* saved uid */
75 gid_t zgid
; /* gid to run as */
76 gid_t vtygrp
; /* gid for vty sockets */
79 /* externally exported but not directly accessed functions */
80 #ifdef HAVE_CAPABILITIES
81 int zprivs_change_caps (zebra_privs_ops_t
);
82 zebra_privs_current_t
zprivs_state_caps (void);
83 #endif /* HAVE_CAPABILITIES */
84 int zprivs_change_uid (zebra_privs_ops_t
);
85 zebra_privs_current_t
zprivs_state_uid (void);
86 int zprivs_change_null (zebra_privs_ops_t
);
87 zebra_privs_current_t
zprivs_state_null (void);
89 #ifdef HAVE_CAPABILITIES
90 /* internal capability API */
91 static pset_t
*zcaps2sys (zebra_capabilities_t
*, int);
92 static void zprivs_caps_init (struct zebra_privs_t
*);
93 static void zprivs_caps_terminate (void);
95 /* Map of Quagga abstract capabilities to system capabilities */
99 pvalue_t
*system_caps
;
100 } cap_map
[ZCAP_MAX
] =
102 #ifdef HAVE_LCAPS /* Quagga -> Linux capabilities mappings */
103 [ZCAP_SETID
] = { 2, (pvalue_t
[]) { CAP_SETGID
,
105 [ZCAP_BIND
] = { 2, (pvalue_t
[]) { CAP_NET_BIND_SERVICE
}, },
106 [ZCAP_NET_ADMIN
] = { 1, (pvalue_t
[]) { CAP_NET_ADMIN
}, },
107 [ZCAP_NET_RAW
] = { 1, (pvalue_t
[]) { CAP_NET_RAW
}, },
108 [ZCAP_CHROOT
] = { 1, (pvalue_t
[]) { CAP_SYS_CHROOT
, }, },
109 [ZCAP_NICE
] = { 1, (pvalue_t
[]) { CAP_SYS_NICE
}, },
110 [ZCAP_PTRACE
] = { 1, (pvalue_t
[]) { CAP_SYS_PTRACE
}, },
111 [ZCAP_DAC_OVERRIDE
] = { 1, (pvalue_t
[]) { CAP_DAC_OVERRIDE
}, },
112 [ZCAP_READ_SEARCH
] = { 1, (pvalue_t
[]) { CAP_DAC_READ_SEARCH
}, },
113 [ZCAP_SYS_ADMIN
] = { 1, (pvalue_t
[]) { CAP_SYS_ADMIN
}, },
114 [ZCAP_FOWNER
] = { 1, (pvalue_t
[]) { CAP_FOWNER
}, },
115 #elif defined(HAVE_SOLARIS_CAPABILITIES) /* HAVE_LCAPS */
116 /* Quagga -> Solaris privilege mappings */
117 [ZCAP_SETID
] = { 1, (pvalue_t
[]) { PRIV_PROC_SETID
}, },
118 [ZCAP_BIND
] = { 1, (pvalue_t
[]) { PRIV_NET_PRIVADDR
}, },
119 /* IP_CONFIG is a subset of NET_CONFIG and is allowed in zones */
120 #ifdef PRIV_SYS_IP_CONFIG
121 [ZCAP_NET_ADMIN
] = { 1, (pvalue_t
[]) { PRIV_SYS_IP_CONFIG
}, },
123 [ZCAP_NET_ADMIN
] = { 1, (pvalue_t
[]) { PRIV_SYS_NET_CONFIG
}, },
125 [ZCAP_NET_RAW
] = { 2, (pvalue_t
[]) { PRIV_NET_RAWACCESS
,
126 PRIV_NET_ICMPACCESS
}, },
127 [ZCAP_CHROOT
] = { 1, (pvalue_t
[]) { PRIV_PROC_CHROOT
}, },
128 [ZCAP_NICE
] = { 1, (pvalue_t
[]) { PRIV_PROC_PRIOCNTL
}, },
129 [ZCAP_PTRACE
] = { 1, (pvalue_t
[]) { PRIV_PROC_SESSION
}, },
130 [ZCAP_DAC_OVERRIDE
] = { 2, (pvalue_t
[]) { PRIV_FILE_DAC_EXECUTE
,
132 PRIV_FILE_DAC_SEARCH
,
134 PRIV_FILE_DAC_SEARCH
}, },
135 [ZCAP_READ_SEARCH
] = { 2, (pvalue_t
[]) { PRIV_FILE_DAC_SEARCH
,
136 PRIV_FILE_DAC_READ
}, },
137 [ZCAP_SYS_ADMIN
] = { 1, (pvalue_t
[]) { PRIV_SYS_ADMIN
}, },
138 [ZCAP_FOWNER
] = { 1, (pvalue_t
[]) { PRIV_FILE_OWNER
}, },
139 #endif /* HAVE_SOLARIS_CAPABILITIES */
143 /* Linux forms of capabilities methods */
144 /* convert zebras privileges to system capabilities */
146 zcaps2sys (zebra_capabilities_t
*zcaps
, int num
)
149 int i
, j
= 0, count
= 0;
154 /* first count up how many system caps we have */
155 for (i
= 0; i
< num
; i
++)
156 count
+= cap_map
[zcaps
[i
]].num
;
158 if ( (syscaps
= XCALLOC (MTYPE_PRIVS
, (sizeof(pset_t
) * num
))) == NULL
)
160 fprintf (stderr
, "%s: could not allocate syscaps!", __func__
);
164 syscaps
->caps
= XCALLOC (MTYPE_PRIVS
, (sizeof (pvalue_t
) * count
));
168 fprintf (stderr
, "%s: could not XCALLOC caps!", __func__
);
172 /* copy the capabilities over */
174 for (i
=0; i
< num
; i
++)
175 for (j
= 0; j
< cap_map
[zcaps
[i
]].num
; j
++)
176 syscaps
->caps
[count
++] = cap_map
[zcaps
[i
]].system_caps
[j
];
178 /* iterations above should be exact same as previous count, obviously.. */
179 syscaps
->num
= count
;
184 /* set or clear the effective capabilities to/from permitted */
186 zprivs_change_caps (zebra_privs_ops_t op
)
188 cap_flag_value_t cflag
;
190 /* should be no possibility of being called without valid caps */
191 assert (zprivs_state
.syscaps_p
&& zprivs_state
.caps
);
192 if (! (zprivs_state
.syscaps_p
&& zprivs_state
.caps
))
195 if (op
== ZPRIVS_RAISE
)
197 else if (op
== ZPRIVS_LOWER
)
202 if ( !cap_set_flag (zprivs_state
.caps
, CAP_EFFECTIVE
,
203 zprivs_state
.syscaps_p
->num
,
204 zprivs_state
.syscaps_p
->caps
,
206 return cap_set_proc (zprivs_state
.caps
);
210 zebra_privs_current_t
211 zprivs_state_caps (void)
214 cap_flag_value_t val
;
216 /* should be no possibility of being called without valid caps */
217 assert (zprivs_state
.syscaps_p
&& zprivs_state
.caps
);
218 if (! (zprivs_state
.syscaps_p
&& zprivs_state
.caps
))
221 for (i
=0; i
< zprivs_state
.syscaps_p
->num
; i
++)
223 if ( cap_get_flag (zprivs_state
.caps
, zprivs_state
.syscaps_p
->caps
[i
],
224 CAP_EFFECTIVE
, &val
) )
226 zlog_warn ("zprivs_state_caps: could not cap_get_flag, %s",
227 safe_strerror (errno
) );
228 return ZPRIVS_UNKNOWN
;
231 return ZPRIVS_RAISED
;
233 return ZPRIVS_LOWERED
;
237 zprivs_caps_init (struct zebra_privs_t
*zprivs
)
239 zprivs_state
.syscaps_p
= zcaps2sys (zprivs
->caps_p
, zprivs
->cap_num_p
);
240 zprivs_state
.syscaps_i
= zcaps2sys (zprivs
->caps_i
, zprivs
->cap_num_i
);
242 /* Tell kernel we want caps maintained across uid changes */
243 if ( prctl(PR_SET_KEEPCAPS
, 1, 0, 0, 0) == -1 )
245 fprintf (stderr
, "privs_init: could not set PR_SET_KEEPCAPS, %s\n",
246 safe_strerror (errno
) );
250 if ( !zprivs_state
.syscaps_p
)
252 fprintf (stderr
, "privs_init: capabilities enabled, "
253 "but no capabilities supplied\n");
256 /* we have caps, we have no need to ever change back the original user */
257 if (zprivs_state
.zuid
)
259 if ( setreuid (zprivs_state
.zuid
, zprivs_state
.zuid
) )
261 fprintf (stderr
, "zprivs_init (cap): could not setreuid, %s\n",
262 safe_strerror (errno
));
267 if ( !(zprivs_state
.caps
= cap_init()) )
269 fprintf (stderr
, "privs_init: failed to cap_init, %s\n",
270 safe_strerror (errno
));
274 if ( cap_clear (zprivs_state
.caps
) )
276 fprintf (stderr
, "privs_init: failed to cap_clear, %s\n",
277 safe_strerror (errno
));
281 /* set permitted caps */
282 cap_set_flag(zprivs_state
.caps
, CAP_PERMITTED
,
283 zprivs_state
.syscaps_p
->num
,
284 zprivs_state
.syscaps_p
->caps
,
287 /* set inheritable caps, if any */
288 if (zprivs_state
.syscaps_i
&& zprivs_state
.syscaps_i
->num
)
290 cap_set_flag(zprivs_state
.caps
, CAP_INHERITABLE
,
291 zprivs_state
.syscaps_i
->num
,
292 zprivs_state
.syscaps_i
->caps
,
296 /* apply caps. CAP_EFFECTIVE is cleared. we'll raise the caps as
297 * and when, and only when, they are needed.
299 if ( cap_set_proc (zprivs_state
.caps
) )
302 char *current_caps_text
= NULL
;
303 char *wanted_caps_text
= NULL
;
305 fprintf(stderr
, "privs_init: initial cap_set_proc failed: %s\n",
306 safe_strerror(errno
));
308 current_caps
= cap_get_proc();
310 current_caps_text
= cap_to_text(current_caps
, NULL
);
312 wanted_caps_text
= cap_to_text(zprivs_state
.caps
, NULL
);
313 fprintf(stderr
, "Wanted caps: %s\n", wanted_caps_text
? wanted_caps_text
: "???");
314 fprintf(stderr
, "Have caps: %s\n", current_caps_text
? current_caps_text
: "???");
319 /* set methods for the caller to use */
320 zprivs
->change
= zprivs_change_caps
;
321 zprivs
->current_state
= zprivs_state_caps
;
325 zprivs_caps_terminate (void)
327 /* clear all capabilities */
328 if (zprivs_state
.caps
)
329 cap_clear (zprivs_state
.caps
);
331 /* and boom, capabilities are gone forever */
332 if ( cap_set_proc (zprivs_state
.caps
) )
334 fprintf (stderr
, "privs_terminate: cap_set_proc failed, %s",
335 safe_strerror (errno
) );
339 /* free up private state */
340 if (zprivs_state
.syscaps_p
->num
)
342 XFREE (MTYPE_PRIVS
, zprivs_state
.syscaps_p
->caps
);
343 XFREE (MTYPE_PRIVS
, zprivs_state
.syscaps_p
);
346 if (zprivs_state
.syscaps_i
&& zprivs_state
.syscaps_i
->num
)
348 XFREE (MTYPE_PRIVS
, zprivs_state
.syscaps_i
->caps
);
349 XFREE (MTYPE_PRIVS
, zprivs_state
.syscaps_i
);
352 cap_free (zprivs_state
.caps
);
354 #elif defined (HAVE_SOLARIS_CAPABILITIES) /* !HAVE_LCAPS */
356 /* Solaris specific capability/privilege methods
359 * - the 'privileges' man page
360 * - http://cvs.opensolaris.org
361 * - http://blogs.sun.com/roller/page/gbrunett?entry=privilege_enabling_set_id_programs1
365 zprivs_caps_minimal ()
369 if ((minimal
= priv_str_to_set("basic", ",", NULL
)) == NULL
)
371 fprintf (stderr
, "%s: couldn't get basic set!\n", __func__
);
375 /* create a minimal privilege set from the basic set */
376 (void) priv_delset(minimal
, PRIV_PROC_EXEC
);
377 (void) priv_delset(minimal
, PRIV_PROC_INFO
);
378 (void) priv_delset(minimal
, PRIV_PROC_SESSION
);
379 (void) priv_delset(minimal
, PRIV_FILE_LINK_ANY
);
384 /* convert zebras privileges to system capabilities */
386 zcaps2sys (zebra_capabilities_t
*zcaps
, int num
)
391 if ((syscaps
= priv_allocset()) == NULL
)
393 fprintf (stderr
, "%s: could not allocate syscaps!\n", __func__
);
397 priv_emptyset (syscaps
);
399 for (i
=0; i
< num
; i
++)
400 for (j
= 0; j
< cap_map
[zcaps
[i
]].num
; j
++)
401 priv_addset (syscaps
, cap_map
[zcaps
[i
]].system_caps
[j
]);
406 /* callback exported to users to RAISE and LOWER effective privileges
407 * from nothing to the given permitted set and back down
410 zprivs_change_caps (zebra_privs_ops_t op
)
414 /* should be no possibility of being called without valid caps */
415 assert (zprivs_state
.syscaps_p
);
416 if (!zprivs_state
.syscaps_p
)
418 fprintf (stderr
, "%s: Eek, missing privileged caps!", __func__
);
422 assert (zprivs_state
.caps
);
423 if (!zprivs_state
.caps
)
425 fprintf (stderr
, "%s: Eek, missing caps!", __func__
);
429 /* to raise: copy original permitted as our working effective set
430 * to lower: copy regular effective set stored in zprivs_state.caps
432 if (op
== ZPRIVS_RAISE
)
433 privset
= zprivs_state
.syscaps_p
;
434 else if (op
== ZPRIVS_LOWER
)
435 privset
= zprivs_state
.caps
;
439 if (setppriv (PRIV_SET
, PRIV_EFFECTIVE
, privset
) != 0)
445 /* Retrieve current privilege state, is it RAISED or LOWERED? */
446 zebra_privs_current_t
447 zprivs_state_caps (void)
449 zebra_privs_current_t result
;
452 if ( (effective
= priv_allocset()) == NULL
)
454 fprintf (stderr
, "%s: failed to get priv_allocset! %s\n", __func__
,
455 safe_strerror (errno
));
456 return ZPRIVS_UNKNOWN
;
459 if (getppriv (PRIV_EFFECTIVE
, effective
))
461 fprintf (stderr
, "%s: failed to get state! %s\n", __func__
,
462 safe_strerror (errno
));
463 result
= ZPRIVS_UNKNOWN
;
467 if (priv_isequalset (effective
, zprivs_state
.syscaps_p
))
468 result
= ZPRIVS_RAISED
;
469 else if (priv_isequalset (effective
, zprivs_state
.caps
))
470 result
= ZPRIVS_LOWERED
;
472 result
= ZPRIVS_UNKNOWN
;
475 priv_freeset (effective
);
480 zprivs_caps_init (struct zebra_privs_t
*zprivs
)
485 /* the specified sets */
486 zprivs_state
.syscaps_p
= zcaps2sys (zprivs
->caps_p
, zprivs
->cap_num_p
);
487 zprivs_state
.syscaps_i
= zcaps2sys (zprivs
->caps_i
, zprivs
->cap_num_i
);
489 /* nonsensical to have gotten here but not have capabilities */
490 if (!zprivs_state
.syscaps_p
)
492 fprintf (stderr
, "%s: capabilities enabled, "
493 "but no valid capabilities supplied\n",
497 /* We retain the basic set in our permitted set, as Linux has no
498 * equivalent. The basic set on Linux hence is implicit, always
501 if ((basic
= priv_str_to_set("basic", ",", NULL
)) == NULL
)
503 fprintf (stderr
, "%s: couldn't get basic set!\n", __func__
);
507 /* Add the basic set to the permitted set */
508 priv_union (basic
, zprivs_state
.syscaps_p
);
509 priv_freeset (basic
);
511 /* Hey kernel, we know about privileges!
512 * this isn't strictly required, use of setppriv should have same effect
514 if (setpflags (PRIV_AWARE
, 1))
516 fprintf (stderr
, "%s: error setting PRIV_AWARE!, %s\n", __func__
,
517 safe_strerror (errno
) );
521 /* need either valid or empty sets for both p and i.. */
522 assert (zprivs_state
.syscaps_i
&& zprivs_state
.syscaps_p
);
524 /* we have caps, we have no need to ever change back the original user
525 * change real, effective and saved to the specified user.
527 if (zprivs_state
.zuid
)
529 if ( setreuid (zprivs_state
.zuid
, zprivs_state
.zuid
) )
531 fprintf (stderr
, "%s: could not setreuid, %s\n",
532 __func__
, safe_strerror (errno
));
537 /* set the permitted set */
538 if (setppriv (PRIV_SET
, PRIV_PERMITTED
, zprivs_state
.syscaps_p
))
540 fprintf (stderr
, "%s: error setting permitted set!, %s\n", __func__
,
541 safe_strerror (errno
) );
545 /* set the inheritable set */
546 if (setppriv (PRIV_SET
, PRIV_INHERITABLE
, zprivs_state
.syscaps_i
))
548 fprintf (stderr
, "%s: error setting inheritable set!, %s\n", __func__
,
549 safe_strerror (errno
) );
553 /* we need a minimal basic set for 'effective', potentially for inheritable too */
554 minimal
= zprivs_caps_minimal();
556 /* now set the effective set with a subset of basic privileges */
557 if (setppriv (PRIV_SET
, PRIV_EFFECTIVE
, minimal
))
559 fprintf (stderr
, "%s: error setting effective set!, %s\n", __func__
,
560 safe_strerror (errno
) );
564 /* we'll use the minimal set as our working-storage privset */
565 zprivs_state
.caps
= minimal
;
567 /* set methods for the caller to use */
568 zprivs
->change
= zprivs_change_caps
;
569 zprivs
->current_state
= zprivs_state_caps
;
573 zprivs_caps_terminate (void)
575 assert (zprivs_state
.caps
);
577 /* clear all capabilities by using working-storage privset */
578 setppriv (PRIV_SET
, PRIV_EFFECTIVE
, zprivs_state
.caps
);
579 setppriv (PRIV_SET
, PRIV_PERMITTED
, zprivs_state
.caps
);
580 setppriv (PRIV_SET
, PRIV_INHERITABLE
, zprivs_state
.caps
);
582 /* free up private state */
583 if (zprivs_state
.syscaps_p
)
584 priv_freeset (zprivs_state
.syscaps_p
);
585 if (zprivs_state
.syscaps_i
)
586 priv_freeset (zprivs_state
.syscaps_i
);
588 priv_freeset (zprivs_state
.caps
);
590 #else /* !HAVE_LCAPS && ! HAVE_SOLARIS_CAPABILITIES */
591 #error "Neither Solaris nor Linux capabilities, dazed and confused..."
592 #endif /* HAVE_LCAPS */
593 #endif /* HAVE_CAPABILITIES */
596 zprivs_change_uid (zebra_privs_ops_t op
)
599 if (op
== ZPRIVS_RAISE
)
600 return seteuid (zprivs_state
.zsuid
);
601 else if (op
== ZPRIVS_LOWER
)
602 return seteuid (zprivs_state
.zuid
);
607 zebra_privs_current_t
608 zprivs_state_uid (void)
610 return ( (zprivs_state
.zuid
== geteuid()) ? ZPRIVS_LOWERED
: ZPRIVS_RAISED
);
614 zprivs_change_null (zebra_privs_ops_t op
)
619 zebra_privs_current_t
620 zprivs_state_null (void)
622 return zprivs_null_state
;
626 zprivs_init(struct zebra_privs_t
*zprivs
)
628 struct passwd
*pwentry
= NULL
;
629 struct group
*grentry
= NULL
;
630 gid_t groups
[NGROUPS_MAX
];
635 fprintf (stderr
, "zprivs_init: called with NULL arg!\n");
640 if (! (zprivs
->user
|| zprivs
->group
641 || zprivs
->cap_num_p
|| zprivs
->cap_num_i
) )
643 zprivs
->change
= zprivs_change_null
;
644 zprivs
->current_state
= zprivs_state_null
;
650 if ( (pwentry
= getpwnam (zprivs
->user
)) == NULL
)
652 /* cant use log.h here as it depends on vty */
653 fprintf (stderr
, "privs_init: could not lookup user %s\n",
658 zprivs_state
.zuid
= pwentry
->pw_uid
;
659 zprivs_state
.zgid
= pwentry
->pw_gid
;
666 if ( (grentry
= getgrnam (zprivs
->group
)) == NULL
)
668 fprintf (stderr
, "privs_init: could not lookup group %s\n",
673 zprivs_state
.zgid
= grentry
->gr_gid
;
678 ngroups
= sizeof(groups
);
679 if ( (ngroups
= getgrouplist (zprivs
->user
, zprivs_state
.zgid
, groups
, &ngroups
)) < 0 )
681 /* cant use log.h here as it depends on vty */
682 fprintf (stderr
, "privs_init: could not getgrouplist for user %s\n",
688 if (zprivs
->vty_group
)
689 /* Add the vty_group to the supplementary groups so it can be chowned to */
691 if ( (grentry
= getgrnam (zprivs
->vty_group
)) )
693 zprivs_state
.vtygrp
= grentry
->gr_gid
;
695 for ( i
= 0; i
< ngroups
; i
++ )
696 if ( groups
[i
] == zprivs_state
.vtygrp
)
699 if ( i
>= ngroups
&& ngroups
< (int) ZEBRA_NUM_OF(groups
) )
701 groups
[i
] = zprivs_state
.vtygrp
;
706 fprintf (stderr
, "privs_init: could not lookup vty group %s\n",
714 if ( setgroups (ngroups
, groups
) )
716 fprintf (stderr
, "privs_init: could not setgroups, %s\n",
717 safe_strerror (errno
) );
722 if (zprivs_state
.zgid
)
724 /* change group now, forever. uid we do later */
725 if ( setregid (zprivs_state
.zgid
, zprivs_state
.zgid
) )
727 fprintf (stderr
, "zprivs_init: could not setregid, %s\n",
728 safe_strerror (errno
) );
733 #ifdef HAVE_CAPABILITIES
734 zprivs_caps_init (zprivs
);
735 #else /* !HAVE_CAPABILITIES */
736 /* we dont have caps. we'll need to maintain rid and saved uid
737 * and change euid back to saved uid (who we presume has all neccessary
738 * privileges) whenever we are asked to raise our privileges.
740 * This is not worth that much security wise, but all we can do.
742 zprivs_state
.zsuid
= geteuid();
743 if ( zprivs_state
.zuid
)
745 if ( setreuid (-1, zprivs_state
.zuid
) )
747 fprintf (stderr
, "privs_init (uid): could not setreuid, %s\n",
748 safe_strerror (errno
));
753 zprivs
->change
= zprivs_change_uid
;
754 zprivs
->current_state
= zprivs_state_uid
;
755 #endif /* HAVE_CAPABILITIES */
759 zprivs_terminate (struct zebra_privs_t
*zprivs
)
763 fprintf (stderr
, "%s: no privs struct given, terminating", __func__
);
767 #ifdef HAVE_CAPABILITIES
768 zprivs_caps_terminate();
769 #else /* !HAVE_CAPABILITIES */
770 if (zprivs_state
.zuid
)
772 if ( setreuid (zprivs_state
.zuid
, zprivs_state
.zuid
) )
774 fprintf (stderr
, "privs_terminate: could not setreuid, %s",
775 safe_strerror (errno
) );
779 #endif /* HAVE_LCAPS */
781 zprivs
->change
= zprivs_change_null
;
782 zprivs
->current_state
= zprivs_state_null
;
783 zprivs_null_state
= ZPRIVS_LOWERED
;
788 zprivs_get_ids(struct zprivs_ids_t
*ids
)
791 ids
->uid_priv
= getuid();
792 (zprivs_state
.zuid
) ? (ids
->uid_normal
= zprivs_state
.zuid
)
793 : (ids
->uid_normal
= -1);
794 (zprivs_state
.zgid
) ? (ids
->gid_normal
= zprivs_state
.zgid
)
795 : (ids
->gid_normal
= -1);
796 (zprivs_state
.vtygrp
) ? (ids
->gid_vty
= zprivs_state
.vtygrp
)
797 : (ids
->gid_vty
= -1);