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/* ISC license. */
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <stdlib.h>
#include <skalibs/gccattributes.h>
#include <skalibs/types.h>
#include <skalibs/strerr2.h>
#include <skalibs/sgetopt.h>
#include <skalibs/cdb.h>
#include <skalibs/djbunix.h>
#include <skalibs/webipc.h>
#include <skalibs/exec.h>
#include <s6/config.h>
#include <s6/accessrules.h>
#ifdef S6_USE_EXECLINE
#include <execline/config.h>
#endif
#define USAGE "s6-ipcserver-access [ -v verbosity ] [ -e | -E ] [ -l localname ] [ -i rulesdir | -x rulesfile ] prog..."
static unsigned int verbosity = 1 ;
/* Utility functions */
static inline void dieusage (void) gccattr_noreturn ;
static inline void dieusage ()
{
strerr_dieusage(100, USAGE) ;
}
static inline void dienomem (void) gccattr_noreturn ;
static inline void dienomem ()
{
strerr_diefu1sys(111, "update environment") ;
}
static inline void X (void) gccattr_noreturn ;
static inline void X ()
{
strerr_dief1x(101, "internal inconsistency. Please submit a bug-report.") ;
}
/* Logging */
static void logit (pid_t pid, uid_t uid, gid_t gid, int h)
{
char fmtpid[PID_FMT] ;
char fmtuid[UID_FMT] ;
char fmtgid[GID_FMT] ;
fmtpid[pid_fmt(fmtpid, pid)] = 0 ;
fmtuid[uid_fmt(fmtuid, uid)] = 0 ;
fmtgid[gid_fmt(fmtgid, gid)] = 0 ;
if (h) strerr_warni7x("allow", " pid ", fmtpid, " uid ", fmtuid, " gid ", fmtgid) ;
else strerr_warni7sys("deny", " pid ", fmtpid, " uid ", fmtuid, " gid ", fmtgid) ;
}
static inline void log_accept (pid_t pid, uid_t uid, gid_t gid)
{
logit(pid, uid, gid, 1) ;
}
static inline void log_deny (pid_t pid, uid_t uid, gid_t gid)
{
logit(pid, uid, gid, 0) ;
}
/* Checking */
static s6_accessrules_result_t check_cdb (uid_t uid, gid_t gid, char const *file, s6_accessrules_params_t *params)
{
struct cdb c = CDB_ZERO ;
int fd = open_readb(file) ;
s6_accessrules_result_t r ;
if (fd < 0) return -1 ;
if (cdb_init(&c, fd) < 0) strerr_diefu2sys(111, "cdb_init ", file) ;
r = s6_accessrules_uidgid_cdb(uid, gid, &c, params) ;
cdb_free(&c) ;
fd_close(fd) ;
return r ;
}
static inline int check (s6_accessrules_params_t *params, char const *rules, unsigned int rulestype, uid_t uid, gid_t gid)
{
char const *x = "" ;
s6_accessrules_result_t r ;
switch (rulestype)
{
case 0 :
if (verbosity >= 2) strerr_warnw1x("invoked without a ruleset!") ;
return 1 ;
case 1 :
r = s6_accessrules_uidgid_fs(uid, gid, rules, params) ;
x = "fs" ;
break ;
case 2 :
r = check_cdb(uid, gid, rules, params) ;
x = "cdb" ;
break ;
default : X() ;
}
switch (r)
{
case S6_ACCESSRULES_ERROR : strerr_diefu4sys(111, "check ", x, " ruleset in ", rules) ;
case S6_ACCESSRULES_ALLOW : return 1 ;
case S6_ACCESSRULES_DENY : return (errno = EACCES, 0) ;
case S6_ACCESSRULES_NOTFOUND : return (errno = ENOENT, 0) ;
default : X() ;
}
}
int main (int argc, char const *const *argv)
{
s6_accessrules_params_t params = S6_ACCESSRULES_PARAMS_ZERO ;
char const *rules = 0 ;
char const *localname = 0 ;
char const *proto ;
size_t protolen ;
uid_t uid = 0 ;
gid_t gid = 0 ;
unsigned int rulestype = 0 ;
int doenv = 1 ;
PROG = "s6-ipcserver-access" ;
{
subgetopt_t l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "v:Eel:i:x:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'v' : if (!uint0_scan(l.arg, &verbosity)) dieusage() ; break ;
case 'E' : doenv = 0 ; break ;
case 'e' : doenv = 1 ; break ;
case 'l' : localname = l.arg ; break ;
case 'i' : rules = l.arg ; rulestype = 1 ; break ;
case 'x' : rules = l.arg ; rulestype = 2 ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (!argc) dieusage() ;
if (!*argv[0]) dieusage() ;
proto = getenv("PROTO") ;
if (!proto) strerr_dienotset(100, "PROTO") ;
protolen = strlen(proto) ;
{
char const *x ;
char tmp[protolen + 11] ;
memcpy(tmp, proto, protolen) ;
memcpy(tmp + protolen, "REMOTEEUID", 11) ;
x = getenv(tmp) ;
if (!x) strerr_dienotset(100, tmp) ;
if (!uid0_scan(x, &uid)) strerr_dieinvalid(100, tmp) ;
tmp[protolen + 7] = 'G' ;
x = getenv(tmp) ;
if (!x) strerr_dienotset(100, tmp) ;
if (!gid0_scan(x, &gid)) strerr_dieinvalid(100, tmp) ;
}
if (check(¶ms, rules, rulestype, uid, gid)) goto accepted ;
if (verbosity >= 2) log_deny(getpid(), uid, gid) ;
return 1 ;
accepted:
if (verbosity) log_accept(getpid(), uid, gid) ;
if (doenv)
{
char tmp[protolen + 10] ;
memcpy(tmp, proto, protolen) ;
memcpy(tmp + protolen, "LOCALPATH", 10) ;
if (localname)
{
if (!env_addmodif(¶ms.env, tmp, localname)) dienomem() ;
}
else
{
char curname[IPCPATH_MAX+1] ;
int dummy ;
if (ipc_local(0, curname, IPCPATH_MAX+1, &dummy) < 0)
strerr_diefu1sys(111, "ipc_local") ;
if (!env_addmodif(¶ms.env, tmp, curname)) dienomem() ;
}
}
else
{
char tmp[protolen + 11] ;
memcpy(tmp, proto, protolen) ;
memcpy(tmp + protolen, "REMOTEEUID", 11) ;
if (!env_addmodif(¶ms.env, "PROTO", 0)) dienomem() ;
if (!env_addmodif(¶ms.env, tmp, 0)) dienomem() ;
tmp[protolen + 7] = 'G' ;
if (!env_addmodif(¶ms.env, tmp, 0)) dienomem() ;
memcpy(tmp + protolen + 6, "PATH", 5) ;
if (!env_addmodif(¶ms.env, tmp, 0)) dienomem() ;
memcpy(tmp + protolen, "LOCALPATH", 10) ;
if (!env_addmodif(¶ms.env, tmp, 0)) dienomem() ;
memcpy(tmp + protolen, "CONNNUM", 8) ;
if (!env_addmodif(¶ms.env, tmp, 0)) dienomem() ;
}
if (params.exec.len)
#ifdef S6_USE_EXECLINE
{
char *specialargv[4] = { EXECLINE_EXTBINPREFIX "execlineb", "-Pc", params.exec.s, 0 } ;
xmexec_m((char const *const *)specialargv, params.env.s, params.env.len) ;
}
#else
strerr_warnw1x("exec file found but ignored because s6 was compiled without execline support!") ;
#endif
xmexec_m(argv, params.env.s, params.env.len) ;
}
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