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/*
* Copyright (c) 2013 Red Hat.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "pmapi.h"
#include "impl.h"
#include "pmda.h"
#include "contexts.h"
static proc_perctx_t *ctxtab;
static int num_ctx;
static uid_t baseuid;
static gid_t basegid;
static void
proc_ctx_clear(int ctx)
{
ctxtab[ctx].state = CTX_INACTIVE;
ctxtab[ctx].uid = -1;
ctxtab[ctx].gid = -1;
ctxtab[ctx].threads = 1;
ctxtab[ctx].cgroups = NULL;
}
void
proc_ctx_end(int ctx)
{
if (ctx < 0 || ctx >= num_ctx || ctxtab[ctx].state == CTX_INACTIVE)
return;
if (ctxtab[ctx].state & CTX_CGROUPS)
free((void *)ctxtab[ctx].cgroups);
proc_ctx_clear(ctx);
}
static void
proc_ctx_growtab(int ctx)
{
size_t need;
if (ctx < num_ctx)
return;
need = (ctx + 1) * sizeof(ctxtab[0]);
ctxtab = (proc_perctx_t *)realloc(ctxtab, need);
if (ctxtab == NULL)
__pmNoMem("proc ctx table", need, PM_FATAL_ERR);
while (num_ctx <= ctx)
proc_ctx_clear(num_ctx++);
}
static void
proc_ctx_set_userid(int ctx, const char *value)
{
proc_ctx_growtab(ctx);
ctxtab[ctx].uid = atoi(value);
ctxtab[ctx].state |= (CTX_ACTIVE | CTX_USERID);
}
static void
proc_ctx_set_groupid(int ctx, const char *value)
{
proc_ctx_growtab(ctx);
ctxtab[ctx].gid = atoi(value);
ctxtab[ctx].state |= (CTX_ACTIVE | CTX_GROUPID);
}
int
proc_ctx_attrs(int ctx, int attr, const char *value, int length, pmdaExt *pmda)
{
if (pmDebug & DBG_TRACE_AUTH) {
char buffer[256];
if (!__pmAttrStr_r(attr, value, buffer, sizeof(buffer))) {
__pmNotifyErr(LOG_ERR, "Bad Attribute: ctx=%d, attr=%d\n", ctx, attr);
} else {
buffer[sizeof(buffer)-1] = '\0';
__pmNotifyErr(LOG_INFO, "Attribute: ctx=%d %s", ctx, buffer);
}
}
switch (attr) {
case PCP_ATTR_USERID:
proc_ctx_set_userid(ctx, value);
break;
case PCP_ATTR_GROUPID:
proc_ctx_set_groupid(ctx, value);
break;
default:
break;
}
return 0;
}
void
proc_ctx_init(void)
{
baseuid = getuid();
basegid = getgid();
}
int
proc_ctx_access(int ctx)
{
proc_perctx_t *pp;
int accessible = 0;
if (ctx < 0 || ctx >= num_ctx)
return accessible;
pp = &ctxtab[ctx];
if (pp->state == CTX_INACTIVE)
return accessible;
if (pp->state & CTX_GROUPID) {
accessible++;
if (basegid != pp->gid) {
if (setegid(pp->gid) < 0) {
__pmNotifyErr(LOG_ERR, "setegid(%d) access failed: %s\n",
pp->gid, osstrerror());
accessible--;
}
}
}
if (pp->state & CTX_USERID) {
accessible++;
if (baseuid != pp->uid) {
if (seteuid(pp->uid) < 0) {
__pmNotifyErr(LOG_ERR, "seteuid(%d) access failed: %s\n",
pp->uid, osstrerror());
accessible--;
}
}
}
return (accessible > 1);
}
int
proc_ctx_revert(int ctx)
{
proc_perctx_t *pp;
if (ctx < 0 || ctx >= num_ctx)
return 0;
pp = &ctxtab[ctx];
if (pp->state == CTX_INACTIVE)
return 0;
if ((pp->state & CTX_USERID) && baseuid != pp->uid) {
if (seteuid(baseuid) < 0)
__pmNotifyErr(LOG_ERR, "seteuid(%d) revert failed: %s\n",
baseuid, osstrerror());
}
if ((pp->state & CTX_GROUPID) && basegid != pp->gid) {
if (setegid(basegid) < 0)
__pmNotifyErr(LOG_ERR, "setegid(%d) revert failed: %s\n",
basegid, osstrerror());
}
return 0;
}
unsigned int
proc_ctx_threads(int ctx, unsigned int threads)
{
proc_perctx_t *pp;
if (ctx < 0 || ctx >= num_ctx)
return threads; /* fallback to default */
pp = &ctxtab[ctx];
if (pp->state == CTX_INACTIVE)
return threads; /* fallback to default */
if (pp->state & CTX_THREADS)
return pp->threads; /* client setting */
return threads; /* fallback to default */
}
int
proc_ctx_set_threads(int ctx, unsigned int threads)
{
proc_perctx_t *pp;
if (ctx < 0 || ctx >= num_ctx)
return PM_ERR_NOCONTEXT;
pp = &ctxtab[ctx];
if (pp->state == CTX_INACTIVE)
return PM_ERR_NOCONTEXT;
if (threads > 1)
return PM_ERR_CONV;
pp->state |= CTX_THREADS;
pp->threads = threads;
return 0;
}
const char *
proc_ctx_cgroups(int ctx, const char *cgroups)
{
proc_perctx_t *pp;
if (ctx < 0 || ctx >= num_ctx)
return cgroups; /* fallback to default */
pp = &ctxtab[ctx];
if (pp->state == CTX_INACTIVE)
return cgroups; /* fallback to default */
if (pp->state & CTX_CGROUPS)
return pp->cgroups; /* client setting */
return cgroups; /* fallback to default */
}
int
proc_ctx_set_cgroups(int ctx, const char *cgroups)
{
proc_perctx_t *pp;
if (ctx < 0 || ctx >= num_ctx)
return PM_ERR_NOCONTEXT;
pp = &ctxtab[ctx];
if (pp->state == CTX_INACTIVE)
return PM_ERR_NOCONTEXT;
if (cgroups == NULL || cgroups[0] == '\0')
return PM_ERR_CONV;
pp->state |= CTX_CGROUPS;
pp->cgroups = cgroups;
return 0;
}
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