diff options
Diffstat (limited to 'utils/nfsidmap')
| -rw-r--r-- | utils/nfsidmap/Makefile.am | 14 | ||||
| -rw-r--r-- | utils/nfsidmap/Makefile.in | 811 | ||||
| -rw-r--r-- | utils/nfsidmap/id_resolver.conf | 1 | ||||
| -rw-r--r-- | utils/nfsidmap/nfsidmap.c | 478 | ||||
| -rw-r--r-- | utils/nfsidmap/nfsidmap.man | 159 |
5 files changed, 1463 insertions, 0 deletions
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0000000..cf7f65e --- /dev/null +++ b/utils/nfsidmap/nfsidmap.c @@ -0,0 +1,478 @@ +#include "config.h" + +#include <stdarg.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <errno.h> +#include <libgen.h> + +#include <pwd.h> +#include <grp.h> +#include <keyutils.h> +#include <nfsidmap.h> + +#include <unistd.h> +#include "xlog.h" +#include "conffile.h" +#include "xcommon.h" + +int verbose = 0; +#define USAGE "Usage: %s [-vh] [-c || [-u|-g|-r key] || -d || -l || [-t timeout] key desc]" + +#define MAX_ID_LEN 11 +#define IDMAP_NAMESZ 128 +#define USER 1 +#define GROUP 0 + +#define PROCKEYS "/proc/keys" +#ifndef DEFAULT_KEYRING +#define DEFAULT_KEYRING ".id_resolver" +#endif + +#ifndef PATH_IDMAPDCONF +#define PATH_IDMAPDCONF "/etc/idmapd.conf" +#endif + +#define UIDKEYS 0x1 +#define GIDKEYS 0x2 + +#ifndef HAVE_FIND_KEY_BY_TYPE_AND_DESC +static key_serial_t find_key_by_type_and_desc(const char *type, + const char *desc, key_serial_t destringid) +{ + char buf[BUFSIZ]; + key_serial_t key; + FILE *fp; + + if ((fp = fopen(PROCKEYS, "r")) == NULL) { + xlog_err("fopen(%s) failed: %m", PROCKEYS); + return -1; + } + + key = -1; + while(fgets(buf, BUFSIZ, fp) != NULL) { + unsigned int id; + + if (strstr(buf, type) == NULL) + continue; + if (strstr(buf, desc) == NULL) + continue; + if (sscanf(buf, "%x %*s", &id) != 1) { + xlog_err("Unparsable keyring entry in %s", PROCKEYS); + continue; + } + + key = (key_serial_t)id; + break; + } + + fclose(fp); + return key; +} +#endif + +/* + * Clear all the keys on the given keyring + */ +static int keyring_clear(const char *keyring) +{ + key_serial_t key; + + key = find_key_by_type_and_desc("keyring", keyring, 0); + if (key == -1) { + if (verbose) + xlog_warn("'%s' keyring was not found.", keyring); + return EXIT_SUCCESS; + } + + if (keyctl_clear(key) < 0) { + xlog_err("keyctl_clear(0x%x) failed: %m", + (unsigned int)key); + return EXIT_FAILURE; + } + + if (verbose) + xlog_warn("'%s' cleared", keyring); + return EXIT_SUCCESS; +} + +static int display_default_domain(void) +{ + char domain[NFS4_MAX_DOMAIN_LEN]; + int rc; + + rc = nfs4_get_default_domain(NULL, domain, NFS4_MAX_DOMAIN_LEN); + if (rc) { + xlog_errno(rc, "nfs4_get_default_domain failed: %m"); + return EXIT_FAILURE; + } + + printf("%s\n", domain); + return EXIT_SUCCESS; +} + +static void list_key(key_serial_t key) +{ + char *buffer, *c; + int rc; + + rc = keyctl_describe_alloc(key, &buffer); + if (rc < 0) { + switch (errno) { + case EKEYEXPIRED: + printf("Expired key not displayed\n"); + break; + default: + xlog_err("Failed to describe key: %m"); + } + return; + } + + c = strrchr(buffer, ';'); + if (!c) { + xlog_err("Unparsable key not displayed\n"); + goto out_free; + } + printf(" %s\n", ++c); + +out_free: + free(buffer); +} + +static void list_keys(const char *ring_name, key_serial_t ring_id) +{ + key_serial_t *key; + void *keylist; + int count; + + count = keyctl_read_alloc(ring_id, &keylist); + if (count < 0) { + xlog_err("Failed to read keyring %s: %m", ring_name); + return; + } + count /= (int)sizeof(*key); + + switch (count) { + case 0: + printf("No %s keys found.\n", ring_name); + break; + case 1: + printf("1 %s key found:\n", ring_name); + break; + default: + printf("%u %s keys found:\n", count, ring_name); + } + + for (key = keylist; count--; key++) + list_key(*key); + + free(keylist); +} + +/* + * List all keys on a keyring + */ +static int list_keyring(const char *keyring) +{ + key_serial_t key; + + key = find_key_by_type_and_desc("keyring", keyring, 0); + if (key == -1) { + xlog_err("'%s' keyring was not found.", keyring); + return EXIT_FAILURE; + } + + list_keys(keyring, key); + return EXIT_SUCCESS; +} + +/* + * Find either a user or group id based on the name@domain string + */ +static int id_lookup(char *name_at_domain, key_serial_t key, int type) +{ + char id[MAX_ID_LEN]; + uid_t uid = 0; + gid_t gid = 0; + int rc; + + if (type == USER) { + rc = nfs4_owner_to_uid(name_at_domain, &uid); + sprintf(id, "%u", uid); + } else { + rc = nfs4_group_owner_to_gid(name_at_domain, &gid); + sprintf(id, "%u", gid); + } + if (rc < 0) { + xlog_errno(rc, "id_lookup: %s: for %s failed: %m", + (type == USER ? "nfs4_owner_to_uid" : "nfs4_group_owner_to_gid"), + name_at_domain); + return EXIT_FAILURE; + } + + rc = EXIT_SUCCESS; + if (keyctl_instantiate(key, id, strlen(id) + 1, 0)) { + switch (errno) { + case EDQUOT: + case ENFILE: + case ENOMEM: + /* + * The keyring is full. Clear the keyring and try again + */ + rc = keyring_clear(DEFAULT_KEYRING); + if (rc) + break; + if (keyctl_instantiate(key, id, strlen(id) + 1, 0)) { + rc = EXIT_FAILURE; + xlog_err("id_lookup: keyctl_instantiate failed: %m"); + } + break; + default: + rc = EXIT_FAILURE; + break; + } + } + + return rc; +} + +/* + * Find the name@domain string from either a user or group id + */ +static int name_lookup(char *id, key_serial_t key, int type) +{ + char name[IDMAP_NAMESZ]; + char domain[NFS4_MAX_DOMAIN_LEN]; + uid_t uid; + gid_t gid; + int rc; + + rc = nfs4_get_default_domain(NULL, domain, NFS4_MAX_DOMAIN_LEN); + if (rc) { + xlog_errno(rc, + "name_lookup: nfs4_get_default_domain failed: %m"); + return EXIT_FAILURE; + } + + if (type == USER) { + uid = atoi(id); + rc = nfs4_uid_to_name(uid, domain, name, IDMAP_NAMESZ); + } else { + gid = atoi(id); + rc = nfs4_gid_to_name(gid, domain, name, IDMAP_NAMESZ); + } + if (rc) { + xlog_errno(rc, "name_lookup: %s: for %u failed: %m", + (type == USER ? "nfs4_uid_to_name" : "nfs4_gid_to_name"), + (type == USER ? uid : gid)); + return EXIT_FAILURE; + } + + rc = EXIT_SUCCESS; + if (keyctl_instantiate(key, &name, strlen(name), 0)) { + rc = EXIT_FAILURE; + xlog_err("name_lookup: keyctl_instantiate failed: %m"); + } + + return rc; +} + +/* + * Revoke a key + */ +static int key_invalidate(char *keystr, int keymask) +{ + FILE *fp; + char buf[BUFSIZ], *ptr; + unsigned int key; + int mask; + + xlog_syslog(0); + + if ((fp = fopen(PROCKEYS, "r")) == NULL) { + xlog_err("fopen(%s) failed: %m", PROCKEYS); + return EXIT_FAILURE; + } + + while(fgets(buf, BUFSIZ, fp) != NULL) { + if (strstr(buf, "keyring") != NULL) + continue; + + mask = 0; + if ((ptr = strstr(buf, "uid:")) != NULL) + mask = UIDKEYS; + else if ((ptr = strstr(buf, "gid:")) != NULL) + mask = GIDKEYS; + else + continue; + + if ((keymask & mask) == 0) + continue; + + if (strncmp(ptr+4, keystr, strlen(keystr)) != 0) + continue; + + if (verbose) { + *(strchr(buf, '\n')) = '\0'; + xlog_warn("invalidating '%s'", buf); + } + /* + * The key is the first arugment in the string + */ + *(strchr(buf, ' ')) = '\0'; + sscanf(buf, "%x", &key); + +/* older libkeyutils compatibility */ +#ifndef KEYCTL_INVALIDATE +#define KEYCTL_INVALIDATE 21 /* invalidate a key */ +#endif + if (keyctl(KEYCTL_INVALIDATE, key) < 0) { + if (errno != EOPNOTSUPP) { + xlog_err("keyctl_invalidate(0x%x) failed: %m", key); + fclose(fp); + return EXIT_FAILURE; + } else { + /* older kernel compatibility attempt: */ + if (keyctl_revoke(key) < 0) { + xlog_err("keyctl_revoke(0x%x) failed: %m", key); + fclose(fp); + return EXIT_FAILURE; + } + } + } + + keymask &= ~mask; + if (keymask == 0) { + fclose(fp); + return EXIT_SUCCESS; + } + } + xlog_err("'%s' key was not found.", keystr); + fclose(fp); + return EXIT_FAILURE; +} + +int main(int argc, char **argv) +{ + char *arg; + char *value; + char *type; + int rc = 1, opt; + int timeout = 600; + key_serial_t key; + char *progname, *keystr = NULL; + int clearing = 0, keymask = 0, display = 0, list = 0; + + /* Set the basename */ + if ((progname = strrchr(argv[0], '/')) != NULL) + progname++; + else + progname = argv[0]; + + xlog_open(progname); + + while ((opt = getopt(argc, argv, "hdu:g:r:ct:vl")) != -1) { + switch (opt) { + case 'd': + display++; + break; + case 'l': + list++; + break; + case 'u': + keymask = UIDKEYS; + keystr = strdup(optarg); + break; + case 'g': + keymask = GIDKEYS; + keystr = strdup(optarg); + break; + case 'r': + keymask = GIDKEYS|UIDKEYS; + keystr = strdup(optarg); + break; + case 'c': + clearing++; + break; + case 'v': + verbose++; + break; + case 't': + timeout = atoi(optarg); + break; + case 'h': + default: + xlog_warn(USAGE, progname); + exit(opt == 'h' ? 0 : 1); + } + } + + if (geteuid() != 0) { + xlog_err("Must be run as root."); + return EXIT_FAILURE; + } + + if ((rc = nfs4_init_name_mapping(PATH_IDMAPDCONF))) { + xlog_errno(rc, "Unable to create name to user id mappings."); + return EXIT_FAILURE; + } + if (!verbose) + verbose = conf_get_num("General", "Verbosity", 0); + + if (display) + return display_default_domain(); + if (list) + return list_keyring(DEFAULT_KEYRING); + if (keystr) { + return key_invalidate(keystr, keymask); + } + if (clearing) { + xlog_syslog(0); + return keyring_clear(DEFAULT_KEYRING); + } + + xlog_stderr(verbose); + if ((argc - optind) != 2) { + xlog_warn("Bad arg count. Check /etc/request-key.conf"); + xlog_warn(USAGE, progname); + return EXIT_FAILURE; + } + + if (verbose) + nfs4_set_debug(verbose, NULL); + + key = strtol(argv[optind++], NULL, 10); + + arg = xstrdup(argv[optind]); + type = strtok(arg, ":"); + value = strtok(NULL, ":"); + if (value == NULL) { + free(arg); + xlog_err("Error: Null uid/gid value."); + return EXIT_FAILURE; + } + if (verbose) { + xlog_warn("key: 0x%x type: %s value: %s timeout %d", + key, type, value, timeout); + } + + /* Become a possesor of the to-be-instantiated key to set the key's timeout */ + request_key("keyring", DEFAULT_KEYRING, NULL, KEY_SPEC_THREAD_KEYRING); + + if (strcmp(type, "uid") == 0) + rc = id_lookup(value, key, USER); + else if (strcmp(type, "gid") == 0) + rc = id_lookup(value, key, GROUP); + else if (strcmp(type, "user") == 0) + rc = name_lookup(value, key, USER); + else if (strcmp(type, "group") == 0) + rc = name_lookup(value, key, GROUP); + + /* Set timeout to 10 (600 seconds) minutes */ + if (rc == EXIT_SUCCESS) + keyctl_set_timeout(key, timeout); + + free(arg); + return rc; +} diff --git a/utils/nfsidmap/nfsidmap.man b/utils/nfsidmap/nfsidmap.man new file mode 100644 index 0000000..1911c41 --- /dev/null +++ b/utils/nfsidmap/nfsidmap.man @@ -0,0 +1,159 @@ +.\" +.\"@(#)nfsidmap(8) - The NFS idmapper upcall program +.\" +.\" Copyright (C) 2010 Bryan Schumaker <bjschuma@netapp.com> +.TH nfsidmap 8 "1 October 2010" +.SH NAME +nfsidmap \- The NFS idmapper upcall program +.SH SYNOPSIS +.B "nfsidmap [-v] [-t timeout] key desc" +.br +.B "nfsidmap [-v] [-c]" +.br +.B "nfsidmap [-v] [-u|-g|-r user]" +.br +.B "nfsidmap -d" +.br +.B "nfsidmap -l" +.br +.B "nfsidmap -h" +.SH DESCRIPTION +The NFSv4 protocol represents the local system's UID and GID values +on the wire as strings of the form +.IR user@domain . +The process of translating from UID to string and string to UID is +referred to as "ID mapping." +.PP +The system derives the +.I user +part of the string by performing a password or group lookup. +The lookup mechanism is configured in +.IR /etc/idmapd.conf . +.PP +By default, the +.I domain +part of the string is the system's DNS domain name. +It can also be specified in +.I /etc/idmapd.conf +if the system is multi-homed, +or if the system's DNS domain name does +not match the name of the system's Kerberos realm. +.PP +When the domain is not specified in +.I /etc/idmapd.conf +the local DNS server will be queried for the +.I _nfsv4idmapdomain +text record. If the record exists +that will be used as the domain. When the record +does not exist, the domain part of the DNS domain +will used. +.PP +The +.I /usr/sbin/nfsidmap +program performs translations on behalf of the kernel. +The kernel uses the request-key mechanism to perform +an upcall. +.I /usr/sbin/nfsidmap +is invoked by /sbin/request-key, performs the translation, +and initializes a key with the resulting information. +The kernel then caches the translation results in the key. +.PP +.I nfsidmap +can also clear cached ID map results in the kernel, +or revoke one particular key. +An incorrect cached key can result in file and directory ownership +reverting to "nobody" on NFSv4 mount points. +.PP +In addition, the +.B -d +and +.B -l +options are available to help diagnose misconfigurations. +They have no effect on the keyring containing ID mapping results. +.SH OPTIONS +.TP +.B -c +Clear the keyring of all the keys. +.TP +.B -d +Display the system's effective NFSv4 domain name on +.IR stdout . +.TP +.B -g user +Revoke the gid key of the given user. +.TP +.B -h +Display usage message. +.TP +.B -l +Display on +.I stdout +all keys currently in the keyring used to cache ID mapping results. +These keys are visible only to the superuser. +.TP +.B -r user +Revoke both the uid and gid key of the given user. +.TP +.B -t timeout +Set the expiration timer, in seconds, on the key. +The default is 600 seconds (10 mins). +.TP +.B -u user +Revoke the uid key of the given user. +.TP +.B -v +Increases the verbosity of the output to syslog +(can be specified multiple times). +.SH CONFIGURING +The file +.I /etc/request-key.conf +will need to be modified so +.I /sbin/request-key +can properly direct the upcall. The following line should be added before a call +to keyctl negate: +.PP +create id_resolver * * /usr/sbin/nfsidmap -t 600 %k %d +.PP +This will direct all id_resolver requests to the program +.I /usr/sbin/nfsidmap. +The +.B -t 600 +defines how many seconds into the future the key will +expire. This is an optional parameter for +.I /usr/sbin/nfsidmap +and will default to 600 seconds when not specified. +.PP +The idmapper system uses four key descriptions: +.PP + uid: Find the UID for the given user +.br + gid: Find the GID for the given group +.br + user: Find the user name for the given UID +.br + group: Find the group name for the given GID +.PP +You can choose to handle any of these individually, rather than using the +generic upcall program. If you would like to use your own program for a uid +lookup then you would edit your request-key.conf so it looks similar to this: +.PP +create id_resolver uid:* * /some/other/program %k %d +.br +create id_resolver * * /usr/sbin/nfsidmap %k %d +.PP +Notice that the new line was added above the line for the generic program. +request-key will find the first matching line and run the corresponding program. +In this case, /some/other/program will handle all uid lookups, and +/usr/sbin/nfsidmap will handle gid, user, and group lookups. +.SH FILES +.TP +.I /etc/idmapd.conf +ID mapping configuration file +.TP +.I /etc/request-key.conf +Request key configuration file +.SH "SEE ALSO" +.BR idmapd.conf (5), +.BR request-key (8) +.SH AUTHOR +Bryan Schumaker, <bjschuma@netapp.com> |