summaryrefslogtreecommitdiff
path: root/lib
diff options
context:
space:
mode:
Diffstat (limited to 'lib')
-rw-r--r--lib/privs.c107
-rw-r--r--lib/privs.h14
-rw-r--r--lib/zebra.h9
3 files changed, 86 insertions, 44 deletions
diff --git a/lib/privs.c b/lib/privs.c
index 35e5a76b..f3a15cea 100644
--- a/lib/privs.c
+++ b/lib/privs.c
@@ -25,7 +25,6 @@
#include "log.h"
#include "privs.h"
#include "memory.h"
-
/* internal privileges state */
static struct _zprivs_t
@@ -40,6 +39,7 @@ static struct _zprivs_t
uid_t zuid, /* uid to run as */
zsuid; /* saved uid */
gid_t zgid; /* gid to run as */
+ gid_t vtygrp; /* gid for vty sockets */
} zprivs_state;
/* externally exported but not directly accessed functions */
@@ -69,11 +69,9 @@ cap_map [ZCAP_MAX] =
[ZCAP_DAC_OVERRIDE] = CAP_DAC_OVERRIDE,
[ZCAP_READ_SEARCH] = CAP_DAC_READ_SEARCH,
[ZCAP_SYS_ADMIN] = CAP_SYS_ADMIN,
- [ZCAP_FOWNER] = ZCAP_FOWNER
+ [ZCAP_FOWNER] = CAP_FOWNER
};
-static cap_value_t cap_setuid_value [] = { CAP_SETUID };
-
/* convert zebras privileges to system capabilities */
static cap_value_t *
zcaps2sys (zebra_capabilities_t *zcaps, int num)
@@ -176,6 +174,12 @@ zprivs_init(struct zebra_privs_t *zprivs)
struct passwd *pwentry = NULL;
struct group *grentry = NULL;
+ if (!zprivs)
+ {
+ zlog_err ("zprivs_init: called with NULL arg!");
+ exit (1);
+ }
+
/* NULL privs */
if (! (zprivs->user || zprivs->group
|| zprivs->cap_num_p || zprivs->cap_num_i) )
@@ -188,7 +192,31 @@ zprivs_init(struct zebra_privs_t *zprivs)
if (zprivs->user)
{
if ( (pwentry = getpwnam (zprivs->user)) )
- zprivs_state.zuid = pwentry->pw_uid;
+ {
+ zprivs_state.zuid = pwentry->pw_uid;
+ }
+ else
+ {
+ zlog_err ("privs_init: could not lookup supplied user");
+ exit (1);
+ }
+ }
+
+ grentry = NULL;
+
+ if (zprivs->vty_group)
+ /* Add the vty_group to the supplementary groups so it can be chowned to */
+ {
+ if ( (grentry = getgrnam (zprivs->vty_group)) )
+ {
+ zprivs_state.vtygrp = grentry->gr_gid;
+ if ( setgroups (1, &zprivs_state.vtygrp) )
+ {
+ zlog_err ("privs_init: could not setgroups, %s",
+ strerror (errno) );
+ exit (1);
+ }
+ }
else
{
zlog_err ("privs_init: could not lookup supplied user");
@@ -198,18 +226,20 @@ zprivs_init(struct zebra_privs_t *zprivs)
if (zprivs->group)
{
- if ( (grentry = getgrnam (zprivs->user)) )
- zprivs_state.zgid = grentry->gr_gid;
+ if ( (grentry = getgrnam (zprivs->group)) )
+ {
+ zprivs_state.zgid = grentry->gr_gid;
+ }
else
{
zlog_err ("privs_init: could not lookup supplied user");
exit (1);
}
-
/* change group now, forever. uid we do later */
if ( setregid (zprivs_state.zgid, zprivs_state.zgid) )
{
- zlog_err ("privs_init: could not setregid");
+ zlog_err ("zprivs_init: could not setregid, %s",
+ strerror (errno) );
exit (1);
}
}
@@ -238,6 +268,17 @@ zprivs_init(struct zebra_privs_t *zprivs)
zlog_err ("privs_init: failed to cap_init, %s", strerror (errno) );
exit (1);
}
+
+ /* we have caps, we have no need to ever change back the original user */
+ if (zprivs_state.zuid)
+ {
+ if ( setreuid (zprivs_state.zuid, zprivs_state.zuid) )
+ {
+ zlog_err ("zprivs_init (cap): could not setreuid, %s",
+ strerror (errno) );
+ exit (1);
+ }
+ }
if ( cap_clear (zprivs_state.caps) )
{
@@ -251,12 +292,6 @@ zprivs_init(struct zebra_privs_t *zprivs)
cap_set_flag(zprivs_state.caps, CAP_EFFECTIVE,
zprivs_state.sys_num_p, zprivs_state.syscaps_p, CAP_SET);
- /* still need CAP_SETUID for the moment */
- cap_set_flag(zprivs_state.caps, CAP_PERMITTED,
- 1, cap_setuid_value, CAP_SET);
- cap_set_flag(zprivs_state.caps, CAP_EFFECTIVE,
- 1, cap_setuid_value, CAP_SET);
-
/* set inheritable caps, if any */
if (zprivs_state.sys_num_i)
{
@@ -264,8 +299,8 @@ zprivs_init(struct zebra_privs_t *zprivs)
zprivs_state.sys_num_i, zprivs_state.syscaps_i, CAP_SET);
}
- /* apply caps. CAP_EFFECTIVE is clear bar cap_setuid_value.
- * we'll raise the caps as and when, and only when, they are needed.
+ /* apply caps. CAP_EFFECTIVE is cleared. we'll raise the caps as
+ * and when, and only when, they are needed.
*/
if ( cap_set_proc (zprivs_state.caps) )
{
@@ -273,28 +308,7 @@ zprivs_init(struct zebra_privs_t *zprivs)
exit (1);
}
- /* we have caps, we have no need to ever change back the original user */
- if (zprivs_state.zuid)
- {
- if ( setreuid (zprivs_state.zuid, zprivs_state.zuid) )
- {
- zlog_err ("privs_init (cap): could not setreuid, %s", strerror (errno) );
- exit (1);
- }
- }
-
- /* No more need for cap_setuid_value */
- cap_set_flag(zprivs_state.caps, CAP_PERMITTED,
- 1, cap_setuid_value, CAP_CLEAR);
- cap_set_flag(zprivs_state.caps, CAP_EFFECTIVE,
- 1, cap_setuid_value, CAP_CLEAR);
- if ( cap_set_proc (zprivs_state.caps) )
- {
- zlog_err ("privs_init: cap_set_proc failed to clear cap_setuid, %s",
- strerror (errno) );
- exit (1);
- }
-
+ /* set methods for the caller to use */
zprivs->change = zprivs_change_caps;
zprivs->current_state = zprivs_state_caps;
@@ -354,3 +368,18 @@ zprivs_terminate (void)
#endif /* HAVE_LCAPS */
return;
}
+
+void
+zprivs_get_ids(struct zprivs_ids_t *ids)
+{
+
+ ids->uid_priv = getuid();
+ (zprivs_state.zuid) ? (ids->uid_normal = zprivs_state.zuid)
+ : (ids->uid_normal = -1);
+ (zprivs_state.zgid) ? (ids->gid_normal = zprivs_state.zgid)
+ : (ids->gid_normal = -1);
+ (zprivs_state.vtygrp) ? (ids->gid_vty = zprivs_state.vtygrp)
+ : (ids->gid_vty = -1);
+
+ return;
+}
diff --git a/lib/privs.h b/lib/privs.h
index 3cdd20da..65c9f358 100644
--- a/lib/privs.h
+++ b/lib/privs.h
@@ -63,7 +63,7 @@ struct zebra_privs_t
int cap_num_i;
char *user; /* user and group to run as */
char *group;
-
+ char *vty_group; /* group to chown vty socket to */
/* methods */
int
(*change) (zebra_privs_ops_t); /* change privileges, 0 on success */
@@ -71,9 +71,21 @@ struct zebra_privs_t
(*current_state) (void); /* current privilege state */
};
+struct zprivs_ids_t
+{
+ /* -1 is undefined */
+ uid_t uid_priv; /* privileged uid */
+ uid_t uid_normal; /* normal uid */
+ gid_t gid_priv; /* privileged uid */
+ gid_t gid_normal; /* normal uid */
+ gid_t gid_vty; /* vty gid */
+};
+
/* initialise zebra privileges */
void zprivs_init (struct zebra_privs_t *zprivs);
/* drop all and terminate privileges */
void zprivs_terminate (void);
+ /* query for runtime uid's and gid's, eg vty needs this */
+void zprivs_get_ids(struct zprivs_ids_t *);
#endif /* _ZEBRA_PRIVS_H */
diff --git a/lib/zebra.h b/lib/zebra.h
index 15608dbc..3d71ad8d 100644
--- a/lib/zebra.h
+++ b/lib/zebra.h
@@ -72,10 +72,6 @@ typedef int socklen_t;
#ifdef HAVE_RUSAGE
#include <sys/resource.h>
#endif /* HAVE_RUSAGE */
-#ifdef HAVE_LCAPS
-#include <sys/capability.h>
-#include <sys/prctl.h>
-#endif /* HAVE_LCAPS */
/* machine dependent includes */
#ifdef SUNOS_5
@@ -96,6 +92,11 @@ typedef int socklen_t;
#include <stdarg.h>
#include <assert.h>
+#ifdef HAVE_LCAPS
+#include <sys/capability.h>
+#include <sys/prctl.h>
+#endif /* HAVE_LCAPS */
+
/* network include group */
#include <sys/socket.h>
generated by cgit v1.2.1 (git 2.18.0) at 2024-12-29 05:10:16 +0000