*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; If not, see
- * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
- *
- * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
- * CA 95054 USA or visit www.sun.com if you need additional information or
- * have any questions.
+ * http://www.gnu.org/licenses/gpl-2.0.html
*
* GPL HEADER END
*/
* Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
* Use is subject to license terms.
*
- * Copyright (c) 2011, 2014, Intel Corporation.
+ * Copyright (c) 2011, 2016, Intel Corporation.
*/
/*
* This file is part of Lustre, http://www.lustre.org/
- * Lustre is a trademark of Sun Microsystems, Inc.
*/
+#include <stdbool.h>
#include <stdlib.h>
#include <stdint.h>
#include <stdio.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
-#include <fcntl.h>
#include <pwd.h>
#include <grp.h>
#include <stdarg.h>
#include <stddef.h>
#include <libgen.h>
#include <syslog.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <fcntl.h>
+#include <limits.h>
+#include <ctype.h>
+#include <nss.h>
+#include <dlfcn.h>
-#include <libcfs/util/string.h>
-#include <lnet/nidstr.h>
-#include <lustre/lustre_user.h>
-#include <lustre/lustre_idl.h>
+#include <libcfs/util/param.h>
+#include <linux/lnet/nidstr.h>
+#include <linux/lustre/lustre_user.h>
+#include <linux/lustre/lustre_idl.h>
#define PERM_PATHNAME "/etc/lustre/perm.conf"
+#define LUSTRE_PASSWD "/etc/lustre/passwd"
+#define LUSTRE_GROUP "/etc/lustre/group"
+
+#define L_GETIDENTITY_LOOKUP_CMD "lookup"
+#define NSS_MODULES_MAX_NR 8
+#define NSS_MODULE_NAME_SIZE 32
+#define NSS_SYMBOL_NAME_LEN_MAX 256
+
+static int nss_pw_buf_len;
+static void *nss_pw_buf;
+static int nss_grent_buf_len;
+static void *nss_grent_buf;
+static int g_n_nss_modules;
+static int grent_mod_no = -1;
+
+struct nss_module {
+ char name[NSS_MODULE_NAME_SIZE];
+ int (*getpwuid)(struct nss_module *mod, uid_t, struct passwd *pwd);
+ int (*getgrent)(struct nss_module *mod, struct group *result);
+ void (*endgrent)(struct nss_module *mod);
+ void (*fini)(struct nss_module *mod);
+
+ union {
+ struct {
+ void *l_ptr;
+ int (*l_getpwuid)(uid_t, struct passwd *pwd,
+ char *buffer, size_t buflen,
+ int *errnop);
+ int (*l_getgrent)(struct group *result, char *buffer,
+ size_t buflen, int *errnop);
+ int (*l_endgrent)(void);
+ } lib;
+ struct {
+ FILE *f_passwd;
+ FILE *f_group;
+ } files;
+ } u;
+};
+
+static struct nss_module g_nss_modules[NSS_MODULES_MAX_NR];
+
+#define NSS_LIB_NAME_PATTERN "libnss_%s.so.2"
/*
* permission file format is like this:
* '*' nid means any nid
* '*' uid means any uid
* the valid values for perms are:
- * setuid/setgid/setgrp/rmtacl -- enable corresponding perm
- * nosetuid/nosetgid/nosetgrp/normtacl -- disable corresponding perm
+ * setuid/setgid/setgrp -- enable corresponding perm
+ * nosetuid/nosetgid/nosetgrp -- disable corresponding perm
* they can be listed together, separated by ',',
* when perm and noperm are in the same line (item), noperm is preferential,
* when they are in different lines (items), the latter is preferential,
static void usage(void)
{
- fprintf(stderr,
- "\nusage: %s {mdtname} {uid}\n"
- "Normally invoked as an upcall from Lustre, set via:\n"
- "/proc/fs/lustre/mdt/${mdtname}/identity_upcall\n",
- progname);
+ fprintf(stderr,
+ "\nusage: %s {-d|mdtname} {uid}\n"
+ "Normally invoked as an upcall from Lustre, set via:\n"
+ "lctl set_param mdt.${mdtname}.identity_upcall={path to upcall}\n"
+ "\t-d: debug, print values to stdout instead of Lustre\n"
+ "\tNSS support enabled\n",
+ progname);
+}
+
+static void errlog(const char *fmt, ...)
+{
+ va_list args;
+
+ openlog(progname, LOG_PERROR | LOG_PID, LOG_AUTHPRIV);
+
+ va_start(args, fmt);
+ vsyslog(LOG_WARNING, fmt, args);
+ va_end(args);
+
+ closelog();
}
-static int compare_u32(const void *v1, const void *v2)
+static int compare_gids(const void *v1, const void *v2)
{
- return (*(__u32 *)v1 - *(__u32 *)v2);
+ return (*(gid_t *)v1 - *(gid_t *)v2);
}
-static void errlog(const char *fmt, ...)
+/** getpwuid() replacement */
+static struct passwd *getpwuid_nss(uid_t uid)
+{
+ static struct passwd pw;
+ int i;
+
+ for (i = 0; i < g_n_nss_modules; i++) {
+ struct nss_module *mod = g_nss_modules + i;
+
+ if (mod->getpwuid(mod, uid, &pw) == 0)
+ return &pw;
+ }
+ return NULL;
+}
+
+/**
+ * getgrent() replacement.
+ * simulate getgrent(3) across nss modules
+ */
+static struct group *getgrent_nss(void)
+{
+ static struct group grp;
+
+ if (grent_mod_no < 0)
+ grent_mod_no = 0;
+
+ while (grent_mod_no < g_n_nss_modules) {
+ struct nss_module *mod = g_nss_modules + grent_mod_no;
+
+ if (mod->getgrent(mod, &grp) == 0)
+ return &grp;
+ mod->endgrent(mod);
+ grent_mod_no++;
+ }
+ return NULL;
+}
+
+/** endgrent() replacement */
+static void endgrent_nss(void)
+{
+ if (grent_mod_no < g_n_nss_modules
+ && grent_mod_no >= 0) {
+ struct nss_module *mod = g_nss_modules+grent_mod_no;
+
+ mod->endgrent(mod);
+ }
+ grent_mod_no = -1;
+}
+
+/** lookup symbol in dynamically loaded nss module */
+static void *get_nss_sym(struct nss_module *mod, const char *op)
+{
+ void *res;
+ int bytes;
+ char symbuf[NSS_SYMBOL_NAME_LEN_MAX];
+
+ bytes = snprintf(symbuf, NSS_SYMBOL_NAME_LEN_MAX - 1, "_nss_%s_%s",
+ mod->name, op);
+ if (bytes >= NSS_SYMBOL_NAME_LEN_MAX - 1) {
+ errlog("symbol name too long\n");
+ return NULL;
+ }
+ res = dlsym(mod->u.lib.l_ptr, symbuf);
+ if (res == NULL)
+ errlog("cannot find symbol %s in nss module \"%s\": %s\n",
+ symbuf, mod->name, dlerror());
+ return res;
+}
+
+/** allocate bigger buffer */
+static void enlarge_nss_buffer(void **buf, int *bufsize)
+{
+ free(*buf);
+ *bufsize = *bufsize * 2;
+ *buf = malloc(*bufsize);
+ if (*buf == NULL) {
+ errlog("no memory to allocate bigger buffer of %d bytes\n",
+ *bufsize);
+ exit(-1);
+ }
+}
+
+static int getpwuid_nss_lib(struct nss_module *nss, uid_t uid,
+ struct passwd *pw)
+{
+ int tmp_errno, err;
+
+ while (1) {
+ err = nss->u.lib.l_getpwuid(uid, pw, nss_pw_buf,
+ nss_pw_buf_len, &tmp_errno);
+ if (err == NSS_STATUS_TRYAGAIN) {
+ if (tmp_errno == ERANGE) {
+ /* buffer too small */
+ enlarge_nss_buffer(&nss_pw_buf,
+ &nss_pw_buf_len);
+ }
+ continue;
+ }
+ break;
+ }
+ if (err == NSS_STATUS_SUCCESS)
+ return 0;
+ return -ENOENT;
+}
+
+static int getgrent_nss_lib(struct nss_module *nss, struct group *gr)
+{
+ int tmp_errno, err;
+
+ while (1) {
+ err = nss->u.lib.l_getgrent(gr, nss_grent_buf,
+ nss_grent_buf_len, &tmp_errno);
+ if (err == NSS_STATUS_TRYAGAIN) {
+ if (tmp_errno == ERANGE) {
+ /* buffer too small */
+ enlarge_nss_buffer(&nss_grent_buf,
+ &nss_grent_buf_len);
+ }
+ continue;
+ }
+ break;
+ }
+ if (err == NSS_STATUS_SUCCESS)
+ return 0;
+ return -ENOENT;
+}
+
+static void endgrent_nss_lib(struct nss_module *mod)
+{
+ mod->u.lib.l_endgrent();
+}
+
+/** destroy a "shared lib" nss module */
+static void fini_nss_lib_module(struct nss_module *mod)
+{
+ if (mod->u.lib.l_ptr)
+ dlclose(mod->u.lib.l_ptr);
+}
+
+/** load and initialize a "shared lib" nss module */
+static int init_nss_lib_module(struct nss_module *mod, char *name)
+{
+ char lib_file_name[sizeof(NSS_LIB_NAME_PATTERN) + sizeof(mod->name)];
+
+ if (strlen(name) >= sizeof(mod->name)) {
+ errlog("module name (%s) too long\n", name);
+ exit(1);
+ }
+
+ strncpy(mod->name, name, sizeof(mod->name));
+ mod->name[sizeof(mod->name) - 1] = '\0';
+
+ snprintf(lib_file_name, sizeof(lib_file_name), NSS_LIB_NAME_PATTERN,
+ name);
+
+ mod->getpwuid = getpwuid_nss_lib;
+ mod->getgrent = getgrent_nss_lib;
+ mod->endgrent = endgrent_nss_lib;
+ mod->fini = fini_nss_lib_module;
+
+ mod->u.lib.l_ptr = dlopen(lib_file_name, RTLD_NOW);
+ if (mod->u.lib.l_ptr == NULL) {
+ errlog("dl error %s\n", dlerror());
+ exit(1);
+ }
+ mod->u.lib.l_getpwuid = get_nss_sym(mod, "getpwuid_r");
+ if (mod->getpwuid == NULL)
+ exit(1);
+
+ mod->u.lib.l_getgrent = get_nss_sym(mod, "getgrent_r");
+ if (mod->getgrent == NULL)
+ exit(1);
+
+ mod->u.lib.l_endgrent = get_nss_sym(mod, "endgrent");
+ if (mod->endgrent == NULL)
+ exit(1);
+
+ return 0;
+}
+
+static void fini_lustre_nss_module(struct nss_module *mod)
+{
+ if (mod->u.files.f_passwd)
+ fclose(mod->u.files.f_passwd);
+ if (mod->u.files.f_group)
+ fclose(mod->u.files.f_group);
+}
+
+static int getpwuid_lustre_nss(struct nss_module *mod, uid_t uid,
+ struct passwd *pw)
+{
+ struct passwd *pos;
+
+ while ((pos = fgetpwent(mod->u.files.f_passwd)) != NULL) {
+ if (pos->pw_uid == uid) {
+ *pw = *pos;
+ return 0;
+ }
+ }
+ return -1;
+}
+
+static int getgrent_lustre_nss(struct nss_module *mod, struct group *gr)
+{
+ struct group *pos;
+
+ pos = fgetgrent(mod->u.files.f_group);
+ if (pos) {
+ *gr = *pos;
+ return 0;
+ }
+ return 1;
+}
+
+static void endgrent_lustre_nss(struct nss_module *mod)
+{
+}
+
+/** initialize module to access local /etc/lustre/passwd,group files */
+static int init_lustre_module(struct nss_module *mod)
+{
+ mod->fini = fini_lustre_nss_module;
+ mod->getpwuid = getpwuid_lustre_nss;
+ mod->getgrent = getgrent_lustre_nss;
+ mod->endgrent = endgrent_lustre_nss;
+
+ mod->u.files.f_passwd = fopen(LUSTRE_PASSWD, "r");
+ if (mod->u.files.f_passwd == NULL)
+ exit(1);
+
+ mod->u.files.f_group = fopen(LUSTRE_GROUP, "r");
+ if (mod->u.files.f_group == NULL)
+ exit(1);
+
+ snprintf(mod->name, sizeof(mod->name), "lustre");
+ return 0;
+}
+
+/** load and initialize the "nss" system */
+static void init_nss(void)
+{
+ nss_pw_buf_len = sysconf(_SC_GETPW_R_SIZE_MAX);
+ if (nss_pw_buf_len == -1) {
+ perror("sysconf");
+ exit(1);
+ }
+ nss_pw_buf = malloc(nss_pw_buf_len);
+ if (nss_pw_buf == NULL) {
+ perror("pw buffer allocation");
+ exit(1);
+ }
+
+ nss_grent_buf_len = sysconf(_SC_GETGR_R_SIZE_MAX);
+ if (nss_grent_buf_len == -1) {
+ perror("sysconf");
+ exit(1);
+ }
+ nss_grent_buf = malloc(nss_grent_buf_len);
+ if (nss_grent_buf == NULL) {
+ perror("grent buffer allocation");
+ exit(1);
+ }
+}
+
+/** unload "nss" */
+static void fini_nss(void)
+{
+ int i;
+
+ for (i = 0; i < g_n_nss_modules; i++) {
+ struct nss_module *mod = g_nss_modules + i;
+
+ mod->fini(mod);
+ }
+
+ free(nss_pw_buf);
+ free(nss_grent_buf);
+}
+
+/** get supplementary group info and fill downcall data */
+static int get_groups_nss(struct identity_downcall_data *data,
+ unsigned int maxgroups)
{
- va_list args;
+ struct passwd *pw;
+ struct group *gr;
+ gid_t *groups;
+ unsigned int ngroups = 0;
+ char *pw_name;
+ int i;
+
+ pw = getpwuid_nss(data->idd_uid);
+ if (pw == NULL) {
+ data->idd_err = errno ? errno : EIDRM;
+ errlog("no such user %u\n", data->idd_uid);
+ return -1;
+ }
- openlog(progname, LOG_PERROR | LOG_PID, LOG_AUTHPRIV);
+ data->idd_gid = pw->pw_gid;
+ pw_name = strdup(pw->pw_name);
+ groups = data->idd_groups;
+
+ while ((gr = getgrent_nss()) != NULL && ngroups < maxgroups) {
+ if (gr->gr_gid == pw->pw_gid)
+ continue;
+ if (!gr->gr_mem)
+ continue;
+ for (i = 0; gr->gr_mem[i]; i++) {
+ if (!strcmp(gr->gr_mem[i], pw_name)) {
+ groups[ngroups++] = gr->gr_gid;
+ break;
+ }
+ }
+ }
- va_start(args, fmt);
- vsyslog(LOG_NOTICE, fmt, args);
- va_end(args);
+ endgrent_nss();
- closelog();
+ if (ngroups > 0)
+ qsort(groups, ngroups, sizeof(*groups), compare_gids);
+ data->idd_ngroups = ngroups;
+
+ free(pw_name);
+ return 0;
}
int get_groups_local(struct identity_downcall_data *data,
unsigned int ngroups = 0;
int ngroups_tmp;
struct passwd *pw;
- char *pw_name;
- int namelen;
int i;
pw = getpwuid(data->idd_uid);
}
data->idd_gid = pw->pw_gid;
- namelen = sysconf(_SC_LOGIN_NAME_MAX);
- if (namelen < _POSIX_LOGIN_NAME_MAX)
- namelen = _POSIX_LOGIN_NAME_MAX;
- pw_name = malloc(namelen);
- if (!pw_name) {
- errlog("malloc error\n");
- data->idd_err = errno;
- return -1;
- }
-
- strlcpy(pw_name, pw->pw_name, namelen);
groups = data->idd_groups;
- /* Allocate array of size maxgroups instead of handling two
- * consecutive and potentially racy getgrouplist() calls. */
+ /*
+ * Allocate array of size maxgroups instead of handling two
+ * consecutive and potentially racy getgrouplist() calls.
+ */
groups_tmp = malloc(maxgroups * sizeof(gid_t));
- if (groups_tmp == NULL) {
- free(pw_name);
+ if (!groups_tmp) {
data->idd_err = errno ? errno : ENOMEM;
- errlog("malloc error=%u\n",data->idd_err);
+ errlog("malloc error=%u\n", data->idd_err);
return -1;
}
ngroups_tmp = maxgroups;
if (getgrouplist(pw->pw_name, pw->pw_gid, groups_tmp, &ngroups_tmp) <
0) {
- free(pw_name);
free(groups_tmp);
data->idd_err = errno ? errno : EIDRM;
errlog("getgrouplist() error for uid %u: error=%u\n",
- data->idd_uid, data->idd_err);
+ data->idd_uid, data->idd_err);
return -1;
}
groups[ngroups++] = groups_tmp[i];
if (ngroups > 0)
- qsort(groups, ngroups, sizeof(*groups), compare_u32);
+ qsort(groups, ngroups, sizeof(*groups), compare_gids);
data->idd_ngroups = ngroups;
- free(pw_name);
free(groups_tmp);
return 0;
}
+int get_groups_common(struct identity_downcall_data *data,
+ unsigned int maxgroups)
+{
+ if (g_n_nss_modules)
+ return get_groups_nss(data, maxgroups);
+ return get_groups_local(data, maxgroups);
+}
+
static inline int comment_line(char *line)
{
- char *p = line;
+ char *p = line;
- while (*p && (*p == ' ' || *p == '\t')) p++;
+ while (*p && (*p == ' ' || *p == '\t'))
+ p++;
- if (!*p || *p == '\n' || *p == '#')
- return 1;
- return 0;
+ if (!*p || *p == '\n' || *p == '#')
+ return 1;
+ return 0;
}
static inline int match_uid(uid_t uid, const char *str)
{
- char *end;
- uid_t uid2;
+ char *end;
+ uid_t uid2;
- if(!strcmp(str, "*"))
- return -1;
+ if (!strcmp(str, "*"))
+ return -1;
- uid2 = strtoul(str, &end, 0);
- if (*end)
- return 0;
- return (uid == uid2);
+ uid2 = strtoul(str, &end, 0);
+ if (*end)
+ return 0;
+ return (uid == uid2);
}
-typedef struct {
- char *name;
- __u32 bit;
-} perm_type_t;
+struct perm_type {
+ char *name;
+ __u32 bit;
+};
-static perm_type_t perm_types[] = {
- { "setuid", CFS_SETUID_PERM },
- { "setgid", CFS_SETGID_PERM },
- { "setgrp", CFS_SETGRP_PERM },
- { "rmtacl", CFS_RMTACL_PERM },
- { "rmtown", CFS_RMTOWN_PERM },
- { 0 }
+static struct perm_type perm_types[] = {
+ { "setuid", CFS_SETUID_PERM },
+ { "setgid", CFS_SETGID_PERM },
+ { "setgrp", CFS_SETGRP_PERM },
+ { "rmtacl", 0 },
+ { "rmtown", 0 },
+ { 0 }
};
-static perm_type_t noperm_types[] = {
- { "nosetuid", CFS_SETUID_PERM },
- { "nosetgid", CFS_SETGID_PERM },
- { "nosetgrp", CFS_SETGRP_PERM },
- { "normtacl", CFS_RMTACL_PERM },
- { "normtown", CFS_RMTOWN_PERM },
- { 0 }
+static struct perm_type noperm_types[] = {
+ { "nosetuid", CFS_SETUID_PERM },
+ { "nosetgid", CFS_SETGID_PERM },
+ { "nosetgrp", CFS_SETGRP_PERM },
+ { "normtacl", 0 },
+ { "normtown", 0 },
+ { 0 }
};
int parse_perm(__u32 *perm, __u32 *noperm, char *str)
{
- char *start, *end;
- char name[64];
- perm_type_t *pt;
-
- *perm = 0;
- *noperm = 0;
- start = str;
- while (1) {
+ char *start, *end;
+ char name[64];
+ struct perm_type *pt;
+
+ *perm = 0;
+ *noperm = 0;
+ start = str;
+ while (1) {
size_t len;
+
memset(name, 0, sizeof(name));
end = strchr(start, ',');
- if (end == NULL)
+ if (!end)
end = str + strlen(str);
if (start >= end)
break;
return -E2BIG;
strncpy(name, start, len);
name[len] = '\0';
- for (pt = perm_types; pt->name; pt++) {
- if (!strcasecmp(name, pt->name)) {
- *perm |= pt->bit;
- break;
- }
- }
-
- if (!pt->name) {
- for (pt = noperm_types; pt->name; pt++) {
- if (!strcasecmp(name, pt->name)) {
- *noperm |= pt->bit;
- break;
- }
- }
-
- if (!pt->name) {
- printf("unkown type: %s\n", name);
- return -1;
- }
- }
-
- start = end + 1;
- }
- return 0;
+ for (pt = perm_types; pt->name; pt++) {
+ if (!strcasecmp(name, pt->name)) {
+ *perm |= pt->bit;
+ break;
+ }
+ }
+
+ if (!pt->name) {
+ for (pt = noperm_types; pt->name; pt++) {
+ if (!strcasecmp(name, pt->name)) {
+ *noperm |= pt->bit;
+ break;
+ }
+ }
+
+ if (!pt->name) {
+ printf("unkown type: %s\n", name);
+ return -1;
+ }
+ }
+
+ start = end + 1;
+ }
+ return 0;
}
static int
char uid_str[size];
char nid_str[size];
char perm_str[size];
- lnet_nid_t nid;
- __u32 perm, noperm;
- int rc, i;
+ lnet_nid_t nid;
+ __u32 perm, noperm;
+ int rc, i;
- if (data->idd_nperms >= N_PERMS_MAX) {
- errlog("permission count %d > max %d\n",
- data->idd_nperms, N_PERMS_MAX);
- return -1;
- }
+ if (data->idd_nperms >= N_PERMS_MAX) {
+ errlog("permission count %d > max %d\n",
+ data->idd_nperms, N_PERMS_MAX);
+ return -1;
+ }
rc = sscanf(line, "%s %s %s", nid_str, uid_str, perm_str);
- if (rc != 3) {
- errlog("can't parse line %s\n", line);
- return -1;
- }
-
- if (!match_uid(data->idd_uid, uid_str))
- return 0;
-
- if (!strcmp(nid_str, "*")) {
- nid = LNET_NID_ANY;
- } else {
- nid = libcfs_str2nid(nid_str);
- if (nid == LNET_NID_ANY) {
- errlog("can't parse nid %s\n", nid_str);
- return -1;
- }
- }
-
- if (parse_perm(&perm, &noperm, perm_str)) {
- errlog("invalid perm %s\n", perm_str);
- return -1;
- }
-
- /* merge the perms with the same nid.
- *
- * If there is LNET_NID_ANY in data->idd_perms[i].pdd_nid,
- * it must be data->idd_perms[0].pdd_nid, and act as default perm.
- */
- if (nid != LNET_NID_ANY) {
- int found = 0;
-
- /* search for the same nid */
- for (i = data->idd_nperms - 1; i >= 0; i--) {
- if (data->idd_perms[i].pdd_nid == nid) {
- data->idd_perms[i].pdd_perm =
- (data->idd_perms[i].pdd_perm | perm) &
- ~noperm;
- found = 1;
- break;
- }
- }
-
- /* NOT found, add to tail */
- if (!found) {
- data->idd_perms[data->idd_nperms].pdd_nid = nid;
- data->idd_perms[data->idd_nperms].pdd_perm =
- perm & ~noperm;
- data->idd_nperms++;
- }
- } else {
- if (data->idd_nperms > 0) {
- /* the first one isn't LNET_NID_ANY, need exchange */
- if (data->idd_perms[0].pdd_nid != LNET_NID_ANY) {
- data->idd_perms[data->idd_nperms].pdd_nid =
- data->idd_perms[0].pdd_nid;
- data->idd_perms[data->idd_nperms].pdd_perm =
- data->idd_perms[0].pdd_perm;
- data->idd_perms[0].pdd_nid = LNET_NID_ANY;
- data->idd_perms[0].pdd_perm = perm & ~noperm;
- data->idd_nperms++;
- } else {
- /* only fix LNET_NID_ANY item */
- data->idd_perms[0].pdd_perm =
- (data->idd_perms[0].pdd_perm | perm) &
- ~noperm;
- }
- } else {
- /* it is the first one, only add to head */
- data->idd_perms[0].pdd_nid = LNET_NID_ANY;
- data->idd_perms[0].pdd_perm = perm & ~noperm;
- data->idd_nperms = 1;
- }
- }
-
- return 0;
-}
-
-int get_perms(struct identity_downcall_data *data)
+ if (rc != 3) {
+ errlog("can't parse line %s\n", line);
+ return -1;
+ }
+
+ if (!match_uid(data->idd_uid, uid_str))
+ return 0;
+
+ if (!strcmp(nid_str, "*")) {
+ nid = LNET_NID_ANY;
+ } else {
+ nid = libcfs_str2nid(nid_str);
+ if (nid == LNET_NID_ANY) {
+ errlog("can't parse nid %s\n", nid_str);
+ return -1;
+ }
+ }
+
+ if (parse_perm(&perm, &noperm, perm_str)) {
+ errlog("invalid perm %s\n", perm_str);
+ return -1;
+ }
+
+ /*
+ * merge the perms with the same nid.
+ *
+ * If there is LNET_NID_ANY in data->idd_perms[i].pdd_nid,
+ * it must be data->idd_perms[0].pdd_nid, and act as default perm.
+ */
+ if (nid != LNET_NID_ANY) {
+ int found = 0;
+
+ /* search for the same nid */
+ for (i = data->idd_nperms - 1; i >= 0; i--) {
+ if (data->idd_perms[i].pdd_nid == nid) {
+ data->idd_perms[i].pdd_perm =
+ (data->idd_perms[i].pdd_perm | perm) &
+ ~noperm;
+ found = 1;
+ break;
+ }
+ }
+
+ /* NOT found, add to tail */
+ if (!found) {
+ data->idd_perms[data->idd_nperms].pdd_nid = nid;
+ data->idd_perms[data->idd_nperms].pdd_perm =
+ perm & ~noperm;
+ data->idd_nperms++;
+ }
+ } else {
+ if (data->idd_nperms > 0) {
+ /* the first one isn't LNET_NID_ANY, need exchange */
+ if (data->idd_perms[0].pdd_nid != LNET_NID_ANY) {
+ data->idd_perms[data->idd_nperms].pdd_nid =
+ data->idd_perms[0].pdd_nid;
+ data->idd_perms[data->idd_nperms].pdd_perm =
+ data->idd_perms[0].pdd_perm;
+ data->idd_perms[0].pdd_nid = LNET_NID_ANY;
+ data->idd_perms[0].pdd_perm = perm & ~noperm;
+ data->idd_nperms++;
+ } else {
+ /* only fix LNET_NID_ANY item */
+ data->idd_perms[0].pdd_perm =
+ (data->idd_perms[0].pdd_perm | perm) &
+ ~noperm;
+ }
+ } else {
+ /* it is the first one, only add to head */
+ data->idd_perms[0].pdd_nid = LNET_NID_ANY;
+ data->idd_perms[0].pdd_perm = perm & ~noperm;
+ data->idd_nperms = 1;
+ }
+ }
+
+ return 0;
+}
+
+static char *striml(char *s)
+{
+ while (isspace(*s))
+ s++;
+ return s;
+}
+
+static void check_new_nss_module(struct nss_module *mod)
+{
+ int i;
+
+ for (i = 0; i < g_n_nss_modules; i++) {
+ struct nss_module *pos = g_nss_modules + i;
+
+ if (!strcmp(mod->name, pos->name)) {
+ errlog("attempt to initialize \"%s\" module twice\n",
+ pos->name);
+ exit(-1);
+ }
+ }
+}
+
+#define ONE_DAY (24 * 60 * 60)
+
+static void do_warn_interval(struct timeval *now)
+{
+ bool write_warning = false;
+ bool show_warning = false;
+ const char *perm_warning = PERM_PATHNAME "-warning";
+ struct stat sbuf;
+ const char msg[] =
+ "Use 'lookup lustre'. The 'files' alias is deprecated.\n";
+
+ if (stat(perm_warning, &sbuf)) {
+ if (errno == ENOENT)
+ write_warning = true;
+ } else {
+ show_warning = (now->tv_sec - sbuf.st_mtim.tv_sec) > ONE_DAY;
+ write_warning = sbuf.st_size == 0; /* file still empty? */
+ }
+
+ if (write_warning || show_warning) {
+ const struct timespec times[] = {
+ {.tv_sec = UTIME_NOW},
+ {.tv_sec = UTIME_NOW},
+ };
+ mode_t mode = 0640;
+ int oflags = O_RDWR | O_CREAT;
+ int fd = open(perm_warning, oflags, mode);
+
+ /* if we cannot rate-limit ... better to be quiet */
+ if (fd == -1)
+ return;
+ if (write_warning) {
+ ssize_t written = write(fd, msg, sizeof(msg));
+
+ /* unlikely, but rate-limiting may be broken */
+ if (written <= 0)
+ goto out_close;
+ }
+ errlog("WARNING: %s", msg);
+
+ /* rate limiting is working */
+ if (show_warning)
+ if (futimens(fd, times) < 0)
+ errlog("Change Timestamp failed: %s\n",
+ strerror(errno));
+out_close:
+ close(fd);
+ }
+}
+
+/** initialize module to access local /etc/lustre/passwd,group files */
+static int init_lustre_files_module(struct nss_module *mod,
+ struct timeval *start)
+{
+ do_warn_interval(start);
+ return init_lustre_module(mod);
+}
+
+/**
+ * Check and parse lookup db config line.
+ * File should start with 'lookup' followed by the modules
+ * to be loaded, for example:
+ *
+ * [/etc/lustre/perm.conf]
+ * lookup lustre ldap
+ *
+ * Should search, in order, first found wins:
+ * lustre [/etc/lustre/passwd and /etc/lustre/group]
+ * ldap
+ *
+ * Other common nss modules: nis sss db files
+ * Since historically 'files' has been used exclusively
+ * to mean 'lustre auth files' and disabled using local auth
+ * via libnss_files users must select 'nss_files' to explicitly
+ * enable libnss_files, which is an uncommon configuration.
+ */
+static int lookup_db_line_nss(char *line, struct timeval *start)
+{
+ char *p, *tok;
+ int ret = 0;
+
+ p = striml(line);
+ if (strncmp(p, L_GETIDENTITY_LOOKUP_CMD,
+ sizeof(L_GETIDENTITY_LOOKUP_CMD) - 1))
+ return -EAGAIN;
+
+ tok = strtok(p, " \t");
+ if (tok == NULL || strcmp(tok, L_GETIDENTITY_LOOKUP_CMD))
+ return -EIO;
+
+ while ((tok = strtok(NULL, " \t\n")) != NULL) {
+ struct nss_module *newmod = NULL;
+
+ if (g_n_nss_modules < NSS_MODULES_MAX_NR)
+ newmod = &g_nss_modules[g_n_nss_modules];
+ else
+ return -ERANGE;
+
+ if (!strcmp(tok, "files"))
+ ret = init_lustre_files_module(newmod, start);
+ else if (!strcmp(tok, "lustre"))
+ ret = init_lustre_module(newmod);
+ else if (!strcmp(tok, "nss_files"))
+ ret = init_nss_lib_module(newmod, "files");
+ else
+ ret = init_nss_lib_module(newmod, tok);
+
+ if (ret)
+ break;
+ check_new_nss_module(newmod);
+ g_n_nss_modules++;
+ }
+
+ return ret;
+}
+
+int get_perms(struct identity_downcall_data *data, struct timeval *start)
{
FILE *fp;
char line[PATH_MAX];
-
- fp = fopen(PERM_PATHNAME, "r");
- if (fp == NULL) {
- if (errno == ENOENT) {
- return 0;
- } else {
- errlog("open %s failed: %s\n",
- PERM_PATHNAME, strerror(errno));
- data->idd_err = errno;
- return -1;
- }
- }
+ int ret;
+
+ fp = fopen(PERM_PATHNAME, "r");
+ if (!fp) {
+ if (errno == ENOENT)
+ return 0;
+ errlog("open %s failed: %s\n",
+ PERM_PATHNAME, strerror(errno));
+ data->idd_err = errno;
+ return -1;
+ }
while (fgets(line, sizeof(line), fp)) {
- if (comment_line(line))
- continue;
-
+ if (comment_line(line))
+ continue;
+ ret = lookup_db_line_nss(line, start); /* lookup parsed */
+ if (ret == 0)
+ continue;
if (parse_perm_line(data, line, sizeof(line))) {
- errlog("parse line %s failed!\n", line);
- data->idd_err = EINVAL;
- fclose(fp);
- return -1;
- }
- }
+ errlog("parse line %s failed!\n", line);
+ data->idd_err = EINVAL;
+ fclose(fp);
+ return -1;
+ }
+ }
- fclose(fp);
- return 0;
+ fclose(fp);
+ return 0;
}
static void show_result(struct identity_downcall_data *data)
{
- int i;
+ int i;
- if (data->idd_err) {
- errlog("failed to get identity for uid %d: %s\n",
- data->idd_uid, strerror(data->idd_err));
- return;
- }
+ if (data->idd_err) {
+ errlog("failed to get identity for uid %d: %s\n",
+ data->idd_uid, strerror(data->idd_err));
+ return;
+ }
- printf("uid=%d gid=%d", data->idd_uid, data->idd_gid);
- for (i = 0; i < data->idd_ngroups; i++)
- printf(",%u", data->idd_groups[i]);
- printf("\n");
- printf("permissions:\n"
- " nid\t\t\tperm\n");
- for (i = 0; i < data->idd_nperms; i++) {
- struct perm_downcall_data *pdd;
+ printf("uid=%d gid=%d", data->idd_uid, data->idd_gid);
+ for (i = 0; i < data->idd_ngroups; i++)
+ printf(",%u", data->idd_groups[i]);
+ printf("\n");
+ printf("permissions:\n"
+ " nid\t\t\tperm\n");
+ for (i = 0; i < data->idd_nperms; i++) {
+ struct perm_downcall_data *pdd;
- pdd = &data->idd_perms[i];
+ pdd = &data->idd_perms[i];
- printf(" "LPX64"\t0x%x\n", pdd->pdd_nid, pdd->pdd_perm);
- }
- printf("\n");
+ printf(" %#jx\t0x%x\n", (uintmax_t)pdd->pdd_nid,
+ pdd->pdd_perm);
+ }
+ printf("\n");
}
+#define difftime(a, b) \
+ ((a).tv_sec - (b).tv_sec + \
+ ((a).tv_usec - (b).tv_usec) / 1000000.0)
+
int main(int argc, char **argv)
{
- char *end;
- struct identity_downcall_data *data = NULL;
- char procname[1024];
- unsigned long uid;
- int fd, rc = -EINVAL, size, maxgroups;
-
- progname = basename(argv[0]);
- if (argc != 3) {
- usage();
- goto out;
- }
-
- uid = strtoul(argv[2], &end, 0);
- if (*end) {
- errlog("%s: invalid uid '%s'\n", progname, argv[2]);
- goto out;
- }
-
- maxgroups = sysconf(_SC_NGROUPS_MAX);
- if (maxgroups > NGROUPS_MAX)
- maxgroups = NGROUPS_MAX;
+ char *end;
+ struct identity_downcall_data *data = NULL;
+ glob_t path;
+ unsigned long uid;
+ struct timeval start, idgot, fini;
+ int fd, rc = -EINVAL, size, maxgroups;
+ bool alreadyfailed = false;
+
+ progname = basename(argv[0]);
+ if (argc != 3) {
+ usage();
+ goto out_no_nss;
+ }
+
+ errno = 0;
+ uid = strtoul(argv[2], &end, 0);
+ if (*end != '\0' || end == argv[2] || errno != 0) {
+ errlog("%s: invalid uid '%s'\n", progname, argv[2]);
+ goto out_no_nss;
+ }
+ gettimeofday(&start, NULL);
+
+ maxgroups = sysconf(_SC_NGROUPS_MAX);
+ if (maxgroups > NGROUPS_MAX)
+ maxgroups = NGROUPS_MAX;
if (maxgroups == -1) {
rc = -EINVAL;
- goto out;
+ goto out_no_nss;
+ }
+
+retry:
+ size = offsetof(struct identity_downcall_data, idd_groups[maxgroups]);
+ data = malloc(size);
+ if (!data) {
+ errlog("malloc identity downcall data(%d) failed!\n", size);
+ if (!alreadyfailed) {
+ alreadyfailed = true;
+ goto retry;
+ }
+ rc = -ENOMEM;
+ goto out_no_nss;
}
- size = offsetof(struct identity_downcall_data, idd_groups[maxgroups]);
- data = malloc(size);
- if (!data) {
- errlog("malloc identity downcall data(%d) failed!\n", size);
- rc = -ENOMEM;
- goto out;
- }
+ memset(data, 0, size);
+ data->idd_magic = IDENTITY_DOWNCALL_MAGIC;
+ data->idd_uid = uid;
+
+ init_nss();
- memset(data, 0, size);
- data->idd_magic = IDENTITY_DOWNCALL_MAGIC;
- data->idd_uid = uid;
- /* get groups for uid */
- rc = get_groups_local(data, maxgroups);
- if (rc)
- goto downcall;
+ /* read permission database and/or load nss modules
+ * rc is -1 only when file exists and is not readable or
+ * content has format / syntax errors
+ */
+ rc = get_perms(data, &start);
+ if (rc)
+ goto downcall;
- size = offsetof(struct identity_downcall_data,
- idd_groups[data->idd_ngroups]);
- /* read permission database */
- rc = get_perms(data);
+ /* get groups for uid */
+ rc = get_groups_common(data, maxgroups);
+ if (rc)
+ goto downcall;
+ size = offsetof(struct identity_downcall_data,
+ idd_groups[data->idd_ngroups]);
+
+ gettimeofday(&idgot, NULL);
downcall:
- if (getenv("L_GETIDENTITY_TEST")) {
- show_result(data);
- rc = 0;
- goto out;
- }
-
- snprintf(procname, sizeof(procname),
- "/proc/fs/lustre/mdt/%s/identity_info", argv[1]);
- fd = open(procname, O_WRONLY);
- if (fd < 0) {
- errlog("can't open file %s: %s\n", procname, strerror(errno));
- rc = -1;
- goto out;
- }
-
- rc = write(fd, data, size);
- close(fd);
- if (rc != size) {
- errlog("partial write ret %d: %s\n", rc, strerror(errno));
- rc = -1;
- } else {
- rc = 0;
- }
+ if (strcmp(argv[1], "-d") == 0 || getenv("L_GETIDENTITY_TEST")) {
+ show_result(data);
+ rc = 0;
+ goto out;
+ }
+ rc = cfs_get_param_paths(&path, "mdt/%s/identity_info", argv[1]);
+ if (rc != 0) {
+ rc = -errno;
+ goto out;
+ }
+
+ fd = open(path.gl_pathv[0], O_WRONLY);
+ if (fd < 0) {
+ errlog("can't open file '%s':%s\n", path.gl_pathv[0],
+ strerror(errno));
+ rc = -errno;
+ goto out_params;
+ }
+
+ rc = write(fd, data, size);
+ gettimeofday(&fini, NULL);
+ close(fd);
+ if (rc != size) {
+ errlog("partial write ret %d: %s\n", rc, strerror(errno));
+ if (!alreadyfailed) {
+ alreadyfailed = true;
+ cfs_free_param_data(&path);
+ if (data)
+ free(data);
+ goto retry;
+ }
+ rc = -1;
+ } else {
+ rc = 0;
+ }
+ /* log if it takes more than 20 second to avoid rate limite */
+ if (rc || difftime(fini, start) > 20)
+ errlog("get identity for uid %lu start time %ld.%06ld got time %ld.%06ld end time %ld.%06ld: rc = %d\n",
+ uid, start.tv_sec, start.tv_usec, idgot.tv_sec,
+ idgot.tv_usec, fini.tv_sec, fini.tv_usec, rc);
+
+out_params:
+ cfs_free_param_data(&path);
out:
- if (data != NULL)
- free(data);
- return rc;
+ fini_nss();
+out_no_nss:
+ if (data)
+ free(data);
+ return rc;
}
git://git.whamcloud.com / fs / lustre-release.git / blobdiff