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/*
* Handle communication with knfsd internal cache
*
* We open /proc/net/rpc/{auth.unix.ip,nfsd.export,nfsd.fh}/channel
* and listen for requests (using my_svc_run)
*
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <sys/sysmacros.h>
#include <sys/types.h>
#include <sys/select.h>
#include <sys/stat.h>
#include <sys/vfs.h>
#include <time.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#include <fcntl.h>
#include <errno.h>
#include <ctype.h>
#include <pwd.h>
#include <grp.h>
#include <mntent.h>
#include "misc.h"
#include "nfsd_path.h"
#include "nfslib.h"
#include "exportfs.h"
#include "export.h"
#include "pseudoflavors.h"
#include "xcommon.h"
#include "fsloc.h"
#ifdef USE_BLKID
#include "blkid/blkid.h"
#endif
enum nfsd_fsid {
FSID_DEV = 0,
FSID_NUM,
FSID_MAJOR_MINOR,
FSID_ENCODE_DEV,
FSID_UUID4_INUM,
FSID_UUID8,
FSID_UUID16,
FSID_UUID16_INUM,
};
#undef is_mountpoint
static int is_mountpoint(const char *path)
{
return check_is_mountpoint(path, nfsd_path_lstat);
}
static ssize_t cache_read(int fd, char *buf, size_t len)
{
return nfsd_path_read(fd, buf, len);
}
static ssize_t cache_write(int fd, const char *buf, size_t len)
{
return nfsd_path_write(fd, buf, len);
}
static bool path_lookup_error(int err)
{
switch (err) {
case ELOOP:
case ENAMETOOLONG:
case ENOENT:
case ENOTDIR:
return 1;
}
return 0;
}
/*
* Support routines for text-based upcalls.
* Fields are separated by spaces.
* Fields are either mangled to quote space tab newline slosh with slosh
* or a hexified with a leading \x
* Record is terminated with newline.
*
*/
#define INITIAL_MANAGED_GROUPS 100
extern int use_ipaddr;
static void auth_unix_ip(int f)
{
/* requests are
* class IP-ADDR
* Ignore if class != "nfsd"
* Otherwise find domainname and write back:
*
* "nfsd" IP-ADDR expiry domainname
*/
char class[20];
char ipaddr[INET6_ADDRSTRLEN + 1];
char *client = NULL;
struct addrinfo *ai = NULL;
struct addrinfo *tmp = NULL;
char buf[RPC_CHAN_BUF_SIZE], *bp;
int blen;
blen = read(f, buf, sizeof(buf));
if (blen <= 0 || buf[blen-1] != '\n') return;
buf[blen-1] = 0;
xlog(D_CALL, "auth_unix_ip: inbuf '%s'", buf);
bp = buf;
if (qword_get(&bp, class, 20) <= 0 ||
strcmp(class, "nfsd") != 0)
return;
if (qword_get(&bp, ipaddr, sizeof(ipaddr) - 1) <= 0)
return;
tmp = host_pton(ipaddr);
if (tmp == NULL)
return;
auth_reload();
/* addr is a valid address, find the domain name... */
ai = client_resolve(tmp->ai_addr);
if (ai) {
client = client_compose(ai);
nfs_freeaddrinfo(ai);
}
if (!client)
xlog(D_AUTH, "failed authentication for IP %s", ipaddr);
else if (!use_ipaddr)
xlog(D_AUTH, "successful authentication for IP %s as %s",
ipaddr, *client ? client : "DEFAULT");
else
xlog(D_AUTH, "successful authentication for IP %s",
ipaddr);
bp = buf; blen = sizeof(buf);
qword_add(&bp, &blen, "nfsd");
qword_add(&bp, &blen, ipaddr);
qword_adduint(&bp, &blen, time(0) + default_ttl);
if (use_ipaddr && client) {
memmove(ipaddr + 1, ipaddr, strlen(ipaddr) + 1);
ipaddr[0] = '$';
qword_add(&bp, &blen, ipaddr);
} else if (client)
qword_add(&bp, &blen, *client?client:"DEFAULT");
qword_addeol(&bp, &blen);
if (blen <= 0 || write(f, buf, bp - buf) != bp - buf)
xlog(L_ERROR, "auth_unix_ip: error writing reply");
xlog(D_CALL, "auth_unix_ip: client %p '%s'", client, client?client: "DEFAULT");
free(client);
nfs_freeaddrinfo(tmp);
}
static void auth_unix_gid(int f)
{
/* Request are
* uid
* reply is
* uid expiry count list of group ids
*/
uid_t uid;
struct passwd *pw;
static gid_t *groups = NULL;
static int groups_len = 0;
gid_t *more_groups;
int ngroups;
int rv, i;
char buf[RPC_CHAN_BUF_SIZE], *bp;
int blen;
if (groups_len == 0) {
groups = malloc(sizeof(gid_t) * INITIAL_MANAGED_GROUPS);
if (!groups)
return;
groups_len = INITIAL_MANAGED_GROUPS;
}
ngroups = groups_len;
blen = read(f, buf, sizeof(buf));
if (blen <= 0 || buf[blen-1] != '\n') return;
buf[blen-1] = 0;
bp = buf;
if (qword_get_uint(&bp, &uid) != 0)
return;
pw = getpwuid(uid);
if (!pw)
rv = -1;
else {
rv = getgrouplist(pw->pw_name, pw->pw_gid, groups, &ngroups);
if (rv == -1 && ngroups >= groups_len) {
more_groups = realloc(groups, sizeof(gid_t)*ngroups);
if (!more_groups)
rv = -1;
else {
groups = more_groups;
groups_len = ngroups;
rv = getgrouplist(pw->pw_name, pw->pw_gid,
groups, &ngroups);
}
}
}
bp = buf; blen = sizeof(buf);
qword_adduint(&bp, &blen, uid);
qword_adduint(&bp, &blen, time(0) + default_ttl);
if (rv >= 0) {
qword_adduint(&bp, &blen, ngroups);
for (i=0; i<ngroups; i++)
qword_adduint(&bp, &blen, groups[i]);
} else
qword_adduint(&bp, &blen, 0);
qword_addeol(&bp, &blen);
if (blen <= 0 || write(f, buf, bp - buf) != bp - buf)
xlog(L_ERROR, "auth_unix_gid: error writing reply");
}
#ifdef USE_BLKID
static const char *get_uuid_blkdev(char *path)
{
/* We set *safe if we know that we need the
* fsid from statfs too.
*/
static blkid_cache cache = NULL;
struct stat stb;
char *devname;
blkid_tag_iterate iter;
blkid_dev dev;
const char *type;
const char *val, *uuid = NULL;
if (cache == NULL)
blkid_get_cache(&cache, NULL);
if (nfsd_path_stat(path, &stb) != 0)
return NULL;
devname = blkid_devno_to_devname(stb.st_dev);
if (!devname)
return NULL;
dev = blkid_get_dev(cache, devname, BLKID_DEV_NORMAL);
free(devname);
if (!dev)
return NULL;
iter = blkid_tag_iterate_begin(dev);
if (!iter)
return NULL;
while (blkid_tag_next(iter, &type, &val) == 0) {
if (strcmp(type, "UUID") == 0)
uuid = val;
if (strcmp(type, "TYPE") == 0 &&
strcmp(val, "btrfs") == 0) {
uuid = NULL;
break;
}
}
blkid_tag_iterate_end(iter);
return uuid;
}
#else
#define get_uuid_blkdev(path) (NULL)
#endif
static int get_uuid(const char *val, size_t uuidlen, char *u)
{
/* extract hex digits from uuidstr and compose a uuid
* of the given length (max 16), xoring bytes to make
* a smaller uuid.
*/
size_t i = 0;
memset(u, 0, uuidlen);
for ( ; *val ; val++) {
int c = *val;
if (!isxdigit(c))
continue;
if (isalpha(c)) {
if (isupper(c))
c = c - 'A' + 10;
else
c = c - 'a' + 10;
} else
c = c - '0' + 0;
if ((i&1) == 0)
c <<= 4;
u[i/2] ^= (char)c;
i++;
if (i == uuidlen*2)
i = 0;
}
return 1;
}
/*
* Don't ask libblkid for these filesystems. Note that BTRF is ignored, because
* we generate the identifier from statfs->f_fsid. The rest are network or
* pseudo filesystems. (See <linux/magic.h> for the basic IDs.)
*/
static const unsigned long nonblkid_filesystems[] = {
0x2fc12fc1, /* ZFS_SUPER_MAGIC */
0x9123683E, /* BTRFS_SUPER_MAGIC */
0xFF534D42, /* CIFS_MAGIC_NUMBER */
0x1373, /* DEVFS_SUPER_MAGIC */
0x73757245, /* CODA_SUPER_MAGIC */
0x564C, /* NCP_SUPER_MAGIC */
0x6969, /* NFS_SUPER_MAGIC */
0x9FA0, /* PROC_SUPER_MAGIC */
0x62656572, /* SYSFS_MAGIC */
0x517B, /* SMB_SUPER_MAGIC */
0x01021994, /* TMPFS_SUPER_MAGIC */
0 /* last */
};
static int uuid_by_path(char *path, int type, size_t uuidlen, char *uuid)
{
/* get a uuid for the filesystem found at 'path'.
* There are several possible ways of generating the
* uuids (types).
* Type 0 is used for new filehandles, while other types
* may be used to interpret old filehandle - to ensure smooth
* forward migration.
* We return 1 if a uuid was found (and it might be worth
* trying the next type) or 0 if no more uuid types can be
* extracted.
*/
/* Possible sources of uuid are
* - blkid uuid
* - statfs64 uuid
*
* On some filesystems (e.g. vfat) the statfs64 uuid is simply an
* encoding of the device that the filesystem is mounted from, so
* it we be very bad to use that (as device numbers change). blkid
* must be preferred.
* On other filesystems (e.g. btrfs) the statfs64 uuid contains
* important info that the blkid uuid cannot contain: This happens
* when multiple subvolumes are exported (they have the same
* blkid uuid but different statfs64 uuids).
* We rely on get_uuid_blkdev *knowing* which is which and not returning
* a uuid for filesystems where the statfs64 uuid is better.
*
*/
struct statfs64 st;
char fsid_val[17];
const char *blkid_val = NULL;
const char *val;
int rc;
rc = nfsd_path_statfs64(path, &st);
if (type == 0 && rc == 0) {
const unsigned long *bad;
for (bad = nonblkid_filesystems; *bad; bad++) {
if (*bad == (unsigned long)st.f_type)
break;
}
if (*bad == 0)
blkid_val = get_uuid_blkdev(path);
}
if (rc == 0 &&
(st.f_fsid.__val[0] || st.f_fsid.__val[1]))
snprintf(fsid_val, 17, "%08x%08x",
st.f_fsid.__val[0], st.f_fsid.__val[1]);
else
fsid_val[0] = 0;
if (blkid_val && (type--) == 0)
val = blkid_val;
else if (fsid_val[0] && (type--) == 0)
val = fsid_val;
else
return 0;
get_uuid(val, uuidlen, uuid);
return 1;
}
/* Iterate through /etc/mtab, finding mountpoints
* at or below a given path
*/
static char *next_mnt(void **v, char *p)
{
FILE *f;
struct mntent *me;
size_t l = strlen(p);
if (*v == NULL) {
f = setmntent("/etc/mtab", "r");
*v = f;
} else
f = *v;
while ((me = getmntent(f)) != NULL && l > 1) {
char *mnt_dir = nfsd_path_strip_root(me->mnt_dir);
if (!mnt_dir)
continue;
if (strncmp(mnt_dir, p, l) == 0 && mnt_dir[l] == '/')
return mnt_dir;
}
endmntent(f);
*v = NULL;
return NULL;
}
/* same_path() check is two paths refer to the same directory.
* We don't rely on 'strcmp()' as some filesystems support case-insensitive
* names and we might have two different names for the one directory.
* Theoretically the lengths of the names could be different, but the
* number of components must be the same.
* So if the paths have the same number of components (but aren't identical)
* we ask the kernel if they are the same thing.
* By preference we use name_to_handle_at(), as the mntid it returns
* will distinguish between bind-mount points. If that isn't available
* we fall back on lstat, which is usually good enough.
*/
static inline int count_slashes(char *p)
{
int cnt = 0;
while (*p)
if (*p++ == '/')
cnt++;
return cnt;
}
#if defined(HAVE_STRUCT_FILE_HANDLE)
static int check_same_path_by_handle(const char *child, const char *parent)
{
struct {
struct file_handle fh;
unsigned char handle[128];
} fchild, fparent;
int mnt_child, mnt_parent;
fchild.fh.handle_bytes = 128;
fparent.fh.handle_bytes = 128;
/* This process should have the CAP_DAC_READ_SEARCH capability */
if (nfsd_name_to_handle_at(AT_FDCWD, child, &fchild.fh, &mnt_child, 0) < 0)
return -1;
if (nfsd_name_to_handle_at(AT_FDCWD, parent, &fparent.fh, &mnt_parent, 0) < 0) {
/* If the child resolved, but the parent did not, they differ */
if (path_lookup_error(errno))
return 0;
/* Otherwise, we just don't know */
return -1;
}
if (mnt_child != mnt_parent ||
fchild.fh.handle_bytes != fparent.fh.handle_bytes ||
fchild.fh.handle_type != fparent.fh.handle_type ||
memcmp(fchild.handle, fparent.handle,
fchild.fh.handle_bytes) != 0)
return 0;
return 1;
}
#else
static int check_same_path_by_handle(const char *child, const char *parent)
{
errno = ENOSYS;
return -1;
}
#endif
static int check_same_path_by_inode(const char *child, const char *parent)
{
struct stat sc, sp;
/* This is nearly good enough. However if a directory is
* bind-mounted in two places and both are exported, it
* could give a false positive
*/
if (nfsd_path_lstat(child, &sc) != 0)
return 0;
if (nfsd_path_lstat(parent, &sp) != 0)
return 0;
if (sc.st_dev != sp.st_dev)
return 0;
if (sc.st_ino != sp.st_ino)
return 0;
return 1;
}
static int same_path(char *child, char *parent, int len)
{
static char p[PATH_MAX];
int err;
if (len <= 0)
len = strlen(child);
strncpy(p, child, len);
p[len] = 0;
if (strcmp(p, parent) == 0)
return 1;
/* If number of '/' are different, they must be different */
if (count_slashes(p) != count_slashes(parent))
return 0;
/* Try to use filehandle approach before falling back to stat() */
err = check_same_path_by_handle(p, parent);
if (err != -1)
return err;
return check_same_path_by_inode(p, parent);
}
static int is_subdirectory(char *child, char *parent)
{
/* Check is child is strictly a subdirectory of
* parent or a more distant descendant.
*/
size_t l = strlen(parent);
if (strcmp(parent, "/") == 0 && child[1] != 0)
return 1;
return (same_path(child, parent, l) && child[l] == '/');
}
static int path_matches(nfs_export *exp, char *path)
{
/* Does the path match the export? I.e. is it an
* exact match, or does the export have CROSSMOUNT, and path
* is a descendant?
*/
return same_path(path, exp->m_export.e_path, 0)
|| ((exp->m_export.e_flags & NFSEXP_CROSSMOUNT)
&& is_subdirectory(path, exp->m_export.e_path));
}
static int
export_matches(nfs_export *exp, char *dom, char *path, struct addrinfo *ai)
{
return path_matches(exp, path) && client_matches(exp, dom, ai);
}
/* True iff e1 is a child of e2 (or descendant) and e2 has crossmnt set: */
static bool subexport(struct exportent *e1, struct exportent *e2)
{
char *p1 = e1->e_path, *p2 = e2->e_path;
return e2->e_flags & NFSEXP_CROSSMOUNT
&& is_subdirectory(p1, p2);
}
struct parsed_fsid {
int fsidtype;
/* We could use a union for this, but it would be more
* complicated; why bother? */
uint64_t inode;
unsigned int minor;
unsigned int major;
uint32_t fsidnum;
size_t uuidlen;
char *fhuuid;
};
static int parse_fsid(int fsidtype, int fsidlen, char *fsid,
struct parsed_fsid *parsed)
{
uint32_t dev;
uint32_t inode32;
memset(parsed, 0, sizeof(*parsed));
parsed->fsidtype = fsidtype;
switch(fsidtype) {
case FSID_DEV: /* 4 bytes: 2 major, 2 minor, 4 inode */
if (fsidlen != 8)
return -1;
memcpy(&dev, fsid, 4);
memcpy(&inode32, fsid+4, 4);
parsed->inode = inode32;
parsed->major = ntohl(dev)>>16;
parsed->minor = ntohl(dev) & 0xFFFF;
break;
case FSID_NUM: /* 4 bytes - fsid */
if (fsidlen != 4)
return -1;
memcpy(&parsed->fsidnum, fsid, 4);
break;
case FSID_MAJOR_MINOR: /* 12 bytes: 4 major, 4 minor, 4 inode
* This format is never actually used but was
* an historical accident
*/
if (fsidlen != 12)
return -1;
memcpy(&dev, fsid, 4);
parsed->major = ntohl(dev);
memcpy(&dev, fsid+4, 4);
parsed->minor = ntohl(dev);
memcpy(&inode32, fsid+8, 4);
parsed->inode = inode32;
break;
case FSID_ENCODE_DEV: /* 8 bytes: 4 byte packed device number, 4 inode */
/* This is *host* endian, not net-byte-order, because
* no-one outside this host has any business interpreting it
*/
if (fsidlen != 8)
return -1;
memcpy(&dev, fsid, 4);
memcpy(&inode32, fsid+4, 4);
parsed->inode = inode32;
parsed->major = (dev & 0xfff00) >> 8;
parsed->minor = (dev & 0xff) | ((dev >> 12) & 0xfff00);
break;
case FSID_UUID4_INUM: /* 4 byte inode number and 4 byte uuid */
if (fsidlen != 8)
return -1;
memcpy(&inode32, fsid, 4);
parsed->inode = inode32;
parsed->uuidlen = 4;
parsed->fhuuid = fsid+4;
break;
case FSID_UUID8: /* 8 byte uuid */
if (fsidlen != 8)
return -1;
parsed->uuidlen = 8;
parsed->fhuuid = fsid;
break;
case FSID_UUID16: /* 16 byte uuid */
if (fsidlen != 16)
return -1;
parsed->uuidlen = 16;
parsed->fhuuid = fsid;
break;
case FSID_UUID16_INUM: /* 8 byte inode number and 16 byte uuid */
if (fsidlen != 24)
return -1;
memcpy(&parsed->inode, fsid, 8);
parsed->uuidlen = 16;
parsed->fhuuid = fsid+8;
break;
}
return 0;
}
static int match_fsid(struct parsed_fsid *parsed, nfs_export *exp, char *path)
{
struct stat stb;
int type;
char u[16];
if (nfsd_path_stat(path, &stb) != 0)
goto path_error;
if (!S_ISDIR(stb.st_mode) && !S_ISREG(stb.st_mode))
goto nomatch;
switch (parsed->fsidtype) {
case FSID_DEV:
case FSID_MAJOR_MINOR:
case FSID_ENCODE_DEV:
if (stb.st_ino != parsed->inode)
goto nomatch;
if (parsed->major != major(stb.st_dev) ||
parsed->minor != minor(stb.st_dev))
goto nomatch;
goto match;
case FSID_NUM:
if (((exp->m_export.e_flags & NFSEXP_FSID) == 0 ||
exp->m_export.e_fsid != parsed->fsidnum))
goto nomatch;
goto match;
case FSID_UUID4_INUM:
case FSID_UUID16_INUM:
if (stb.st_ino != parsed->inode)
goto nomatch;
goto check_uuid;
case FSID_UUID8:
case FSID_UUID16:
errno = 0;
if (!is_mountpoint(path)) {
if (!errno)
goto nomatch;
goto path_error;
}
check_uuid:
if (exp->m_export.e_uuid) {
get_uuid(exp->m_export.e_uuid, parsed->uuidlen, u);
if (memcmp(u, parsed->fhuuid, parsed->uuidlen) == 0)
goto match;
}
else
for (type = 0;
uuid_by_path(path, type, parsed->uuidlen, u);
type++)
if (memcmp(u, parsed->fhuuid, parsed->uuidlen) == 0)
goto match;
}
nomatch:
return 0;
match:
return 1;
path_error:
if (path_lookup_error(errno))
goto nomatch;
return -1;
}
static struct addrinfo *lookup_client_addr(char *dom)
{
struct addrinfo *ret;
struct addrinfo *tmp;
dom++; /* skip initial "$" */
tmp = host_pton(dom);
if (tmp == NULL)
return NULL;
ret = client_resolve(tmp->ai_addr);
nfs_freeaddrinfo(tmp);
return ret;
}
static void nfsd_fh(int f)
{
/* request are:
* domain fsidtype fsid
* interpret fsid, find export point and options, and write:
* domain fsidtype fsid expiry path
*/
char *dom;
int fsidtype;
int fsidlen;
char fsid[32];
struct parsed_fsid parsed;
struct exportent *found = NULL;
struct addrinfo *ai = NULL;
char *found_path = NULL;
nfs_export *exp;
int i;
int dev_missing = 0;
char buf[RPC_CHAN_BUF_SIZE], *bp;
int blen;
blen = cache_read(f, buf, sizeof(buf));
if (blen <= 0 || buf[blen-1] != '\n') return;
buf[blen-1] = 0;
xlog(D_CALL, "nfsd_fh: inbuf '%s'", buf);
bp = buf;
dom = malloc(blen);
if (dom == NULL)
return;
if (qword_get(&bp, dom, blen) <= 0)
goto out;
if (qword_get_int(&bp, &fsidtype) != 0)
goto out;
if (fsidtype < 0 || fsidtype > 7)
goto out; /* unknown type */
if ((fsidlen = qword_get(&bp, fsid, 32)) <= 0)
goto out;
if (parse_fsid(fsidtype, fsidlen, fsid, &parsed))
goto out;
auth_reload();
if (is_ipaddr_client(dom)) {
ai = lookup_client_addr(dom);
if (!ai)
goto out;
}
/* Now determine export point for this fsid/domain */
for (i=0 ; i < MCL_MAXTYPES; i++) {
nfs_export *next_exp;
for (exp = exportlist[i].p_head; exp; exp = next_exp) {
char *path;
if (exp->m_export.e_flags & NFSEXP_CROSSMOUNT) {
static nfs_export *prev = NULL;
static void *mnt = NULL;
if (prev == exp) {
/* try a submount */
path = next_mnt(&mnt, exp->m_export.e_path);
if (!path) {
next_exp = exp->m_next;
prev = NULL;
continue;
}
next_exp = exp;
} else {
prev = exp;
mnt = NULL;
path = exp->m_export.e_path;
next_exp = exp;
}
} else {
path = exp->m_export.e_path;
next_exp = exp->m_next;
}
if (!is_ipaddr_client(dom)
&& !namelist_client_matches(exp, dom))
continue;
if (exp->m_export.e_mountpoint &&
!is_mountpoint(exp->m_export.e_mountpoint[0]?
exp->m_export.e_mountpoint:
exp->m_export.e_path))
dev_missing ++;
switch(match_fsid(&parsed, exp, path)) {
case 0:
continue;
case -1:
goto out;
}
if (is_ipaddr_client(dom)
&& !ipaddr_client_matches(exp, ai))
continue;
if (!found || subexport(&exp->m_export, found)) {
found = &exp->m_export;
free(found_path);
found_path = strdup(path);
if (found_path == NULL)
goto out;
} else if (strcmp(found->e_path, exp->m_export.e_path) != 0
&& !subexport(found, &exp->m_export))
{
xlog(L_WARNING, "%s and %s have same filehandle for %s, using first",
found_path, path, dom);
} else {
/* same path, if one is V4ROOT, choose the other */
if (found->e_flags & NFSEXP_V4ROOT) {
found = &exp->m_export;
free(found_path);
found_path = strdup(path);
if (found_path == NULL)
goto out;
}
}
}
}
if (!found) {
/* The missing dev could be what we want, so just be
* quiet rather than returning stale yet
*/
if (dev_missing)
goto out;
} else if (found->e_mountpoint &&
!is_mountpoint(found->e_mountpoint[0]?
found->e_mountpoint:
found->e_path)) {
/* Cannot export this yet
* should log a warning, but need to rate limit
xlog(L_WARNING, "%s not exported as %d not a mountpoint",
found->e_path, found->e_mountpoint);
*/
/* FIXME we need to make sure we re-visit this later */
goto out;
}
bp = buf; blen = sizeof(buf);
qword_add(&bp, &blen, dom);
qword_addint(&bp, &blen, fsidtype);
qword_addhex(&bp, &blen, fsid, fsidlen);
/* The fsid -> path lookup can be quite expensive as it
* potentially stats and reads lots of devices, and some of those
* might have spun-down. The Answer is not likely to
* change underneath us, and an 'exportfs -f' can always
* remove this from the kernel, so use a really log
* timeout. Maybe this should be configurable on the command
* line.
*/
qword_addint(&bp, &blen, 0x7fffffff);
if (found)
qword_add(&bp, &blen, found_path);
qword_addeol(&bp, &blen);
if (blen <= 0 || cache_write(f, buf, bp - buf) != bp - buf)
xlog(L_ERROR, "nfsd_fh: error writing reply");
if (!found)
xlog(D_AUTH, "denied access to %s", *dom == '$' ? dom+1 : dom);
out:
if (found_path)
free(found_path);
nfs_freeaddrinfo(ai);
free(dom);
xlog(D_CALL, "nfsd_fh: found %p path %s", found, found ? found->e_path : NULL);
}
static void write_fsloc(char **bp, int *blen, struct exportent *ep)
{
struct servers *servers;
if (ep->e_fslocmethod == FSLOC_NONE)
return;
servers = replicas_lookup(ep->e_fslocmethod, ep->e_fslocdata);
if (!servers)
return;
qword_add(bp, blen, "fsloc");
qword_addint(bp, blen, servers->h_num);
if (servers->h_num >= 0) {
int i;
for (i=0; i<servers->h_num; i++) {
qword_add(bp, blen, servers->h_mp[i]->h_host);
qword_add(bp, blen, servers->h_mp[i]->h_path);
}
}
qword_addint(bp, blen, servers->h_referral);
release_replicas(servers);
}
static void write_secinfo(char **bp, int *blen, struct exportent *ep, int flag_mask)
{
struct sec_entry *p;
for (p = ep->e_secinfo; p->flav; p++)
; /* Do nothing */
if (p == ep->e_secinfo) {
/* There was no sec= option */
return;
}
fix_pseudoflavor_flags(ep);
qword_add(bp, blen, "secinfo");
qword_addint(bp, blen, p - ep->e_secinfo);
for (p = ep->e_secinfo; p->flav; p++) {
qword_addint(bp, blen, p->flav->fnum);
qword_addint(bp, blen, p->flags & flag_mask);
}
}
static int dump_to_cache(int f, char *buf, int blen, char *domain,
char *path, struct exportent *exp, int ttl)
{
char *bp = buf;
time_t now = time(0);
size_t buflen;
ssize_t err;
if (ttl <= 1)
ttl = default_ttl;
qword_add(&bp, &blen, domain);
qword_add(&bp, &blen, path);
if (exp) {
int different_fs = strcmp(path, exp->e_path) != 0;
int flag_mask = different_fs ? ~NFSEXP_FSID : ~0;
qword_adduint(&bp, &blen, now + exp->e_ttl);
qword_addint(&bp, &blen, exp->e_flags & flag_mask);
qword_addint(&bp, &blen, exp->e_anonuid);
qword_addint(&bp, &blen, exp->e_anongid);
qword_addint(&bp, &blen, exp->e_fsid);
write_fsloc(&bp, &blen, exp);
write_secinfo(&bp, &blen, exp, flag_mask);
if (exp->e_uuid == NULL || different_fs) {
char u[16];
if ((exp->e_flags & flag_mask & NFSEXP_FSID) == 0 &&
uuid_by_path(path, 0, 16, u)) {
qword_add(&bp, &blen, "uuid");
qword_addhex(&bp, &blen, u, 16);
}
} else {
char u[16];
get_uuid(exp->e_uuid, 16, u);
qword_add(&bp, &blen, "uuid");
qword_addhex(&bp, &blen, u, 16);
}
xlog(D_AUTH, "granted access to %s for %s",
path, *domain == '$' ? domain+1 : domain);
} else {
qword_adduint(&bp, &blen, now + ttl);
xlog(D_AUTH, "denied access to %s for %s",
path, *domain == '$' ? domain+1 : domain);
}
qword_addeol(&bp, &blen);
if (blen <= 0) {
errno = ENOBUFS;
return -1;
}
buflen = bp - buf;
err = cache_write(f, buf, buflen);
if (err < 0)
return err;
if ((size_t)err != buflen) {
errno = ENOSPC;
return -1;
}
return 0;
}
static nfs_export *
lookup_export(char *dom, char *path, struct addrinfo *ai)
{
nfs_export *exp;
nfs_export *found = NULL;
int found_type = 0;
int i;
for (i=0 ; i < MCL_MAXTYPES; i++) {
for (exp = exportlist[i].p_head; exp; exp = exp->m_next) {
if (!export_matches(exp, dom, path, ai))
continue;
if (!found) {
found = exp;
found_type = i;
continue;
}
/* Always prefer non-V4ROOT exports */
if (exp->m_export.e_flags & NFSEXP_V4ROOT)
continue;
if (found->m_export.e_flags & NFSEXP_V4ROOT) {
found = exp;
found_type = i;
continue;
}
/* If one is a CROSSMOUNT, then prefer the longest path */
if (((found->m_export.e_flags & NFSEXP_CROSSMOUNT) ||
(exp->m_export.e_flags & NFSEXP_CROSSMOUNT)) &&
strlen(found->m_export.e_path) !=
strlen(exp->m_export.e_path)) {
if (strlen(exp->m_export.e_path) >
strlen(found->m_export.e_path)) {
found = exp;
found_type = i;
}
continue;
} else if (found_type == i && found->m_warned == 0) {
xlog(L_WARNING, "%s exported to both %s and %s, "
"arbitrarily choosing options from first",
path, found->m_client->m_hostname, exp->m_client->m_hostname);
found->m_warned = 1;
}
}
}
return found;
}
#ifdef HAVE_JUNCTION_SUPPORT
#include <libxml/parser.h>
#include "junction.h"
struct nfs_fsloc_set {
int ns_ttl;
struct nfs_fsloc *ns_current;
struct nfs_fsloc *ns_list;
};
/*
* Find the export entry for the parent of "pathname".
* Caller must not free returned exportent.
*/
static struct exportent *lookup_parent_export(char *dom,
const char *pathname, struct addrinfo *ai)
{
char *parent, *slash;
nfs_export *result;
parent = strdup(pathname);
if (parent == NULL) {
xlog(D_GENERAL, "%s: failed to allocate parent path buffer",
__func__);
goto out_default;
}
xlog(D_CALL, "%s: pathname = '%s'", __func__, pathname);
again:
/* shorten pathname by one component */
slash = strrchr(parent, '/');
if (slash == NULL) {
xlog(D_GENERAL, "%s: no slash found in pathname",
__func__);
goto out_default;
}
*slash = '\0';
if (strlen(parent) == 0) {
result = lookup_export(dom, "/", ai);
if (result == NULL) {
xlog(L_ERROR, "%s: no root export found.", __func__);
goto out_default;
}
goto out;
}
result = lookup_export(dom, parent, ai);
if (result == NULL) {
xlog(D_GENERAL, "%s: lookup_export(%s) found nothing",
__func__, parent);
goto again;
}
out:
xlog(D_CALL, "%s: found export for %s", __func__, parent);
free(parent);
return &result->m_export;
out_default:
free(parent);
return mkexportent("*", "/", "insecure");
}
static int get_next_location(struct nfs_fsloc_set *locset,
char **hostname, char **export_path, int *ttl)
{
char *hostname_tmp, *export_path_tmp;
struct nfs_fsloc *fsloc;
if (locset->ns_current == NULL)
return ENOENT;
fsloc = locset->ns_current;
hostname_tmp = strdup(fsloc->nfl_hostname);
if (hostname_tmp == NULL)
return ENOMEM;
if (nsdb_path_array_to_posix(fsloc->nfl_rootpath,
&export_path_tmp)) {
free(hostname_tmp);
return EINVAL;
}
*hostname = hostname_tmp;
*export_path = export_path_tmp;
*ttl = locset->ns_ttl;
locset->ns_current = locset->ns_current->nfl_next;
return 0;
}
/*
* Walk through a set of FS locations and build an e_fslocdata string.
* Returns true if all went to plan; otherwise, false.
*/
static bool locations_to_fslocdata(struct nfs_fsloc_set *locations,
char *fslocdata, size_t remaining, int *ttl)
{
char *server, *last_path, *rootpath, *ptr;
_Bool seen = false;
last_path = NULL;
rootpath = NULL;
server = NULL;
ptr = fslocdata;
*ttl = 0;
for (;;) {
int len, status;
status = get_next_location(locations, &server,
&rootpath, ttl);
if (status == ENOENT)
break;
if (status) {
xlog(D_GENERAL, "%s: failed to parse location: %s",
__func__, strerror(status));
goto out_false;
}
xlog(D_GENERAL, "%s: Location: %s:%s",
__func__, server, rootpath);
if (last_path && strcmp(rootpath, last_path) == 0) {
len = snprintf(ptr, remaining, "+%s", server);
if (len < 0) {
xlog(D_GENERAL, "%s: snprintf: %m", __func__);
goto out_false;
}
if ((size_t)len >= remaining) {
xlog(D_GENERAL, "%s: fslocdata buffer overflow", __func__);
goto out_false;
}
remaining -= (size_t)len;
ptr += len;
} else {
if (last_path == NULL)
len = snprintf(ptr, remaining, "%s@%s",
rootpath, server);
else
len = snprintf(ptr, remaining, ":%s@%s",
rootpath, server);
if (len < 0) {
xlog(D_GENERAL, "%s: snprintf: %m", __func__);
goto out_false;
}
if ((size_t)len >= remaining) {
xlog(D_GENERAL, "%s: fslocdata buffer overflow",
__func__);
goto out_false;
}
remaining -= (size_t)len;
ptr += len;
last_path = rootpath;
}
seen = true;
free(rootpath);
free(server);
}
xlog(D_CALL, "%s: fslocdata='%s', ttl=%d",
__func__, fslocdata, *ttl);
return seen;
out_false:
free(rootpath);
free(server);
return false;
}
/*
* Duplicate the junction's parent's export options and graft in
* the fslocdata we constructed from the locations list.
*/
static struct exportent *create_junction_exportent(struct exportent *parent,
const char *junction, const char *fslocdata, int ttl)
{
static struct exportent *eep;
eep = (struct exportent *)malloc(sizeof(*eep));
if (eep == NULL)
goto out_nomem;
dupexportent(eep, parent);
strcpy(eep->e_path, junction);
eep->e_hostname = strdup(parent->e_hostname);
if (eep->e_hostname == NULL) {
free(eep);
goto out_nomem;
}
free(eep->e_uuid);
eep->e_uuid = NULL;
eep->e_ttl = (unsigned int)ttl;
free(eep->e_fslocdata);
eep->e_fslocdata = strdup(fslocdata);
if (eep->e_fslocdata == NULL) {
free(eep->e_hostname);
free(eep);
goto out_nomem;
}
eep->e_fslocmethod = FSLOC_REFER;
return eep;
out_nomem:
xlog(L_ERROR, "%s: No memory", __func__);
return NULL;
}
/*
* Walk through the set of FS locations and build an exportent.
* Returns pointer to an exportent if "junction" refers to a junction.
*/
static struct exportent *locations_to_export(struct nfs_fsloc_set *locations,
const char *junction, struct exportent *parent)
{
static char fslocdata[BUFSIZ];
int ttl;
fslocdata[0] = '\0';
if (!locations_to_fslocdata(locations, fslocdata, sizeof(fslocdata), &ttl))
return NULL;
return create_junction_exportent(parent, junction, fslocdata, ttl);
}
static int
nfs_get_basic_junction(const char *junct_path, struct nfs_fsloc_set **locset)
{
struct nfs_fsloc_set *new;
FedFsStatus retval;
new = calloc(1, sizeof(struct nfs_fsloc_set));
if (new == NULL)
return ENOMEM;
retval = nfs_get_locations(junct_path, &new->ns_list);
if (retval) {
nfs_free_locations(new->ns_list);
free(new);
return EINVAL;
}
new->ns_current = new->ns_list;
new->ns_ttl = 300;
*locset = new;
return 0;
}
static struct exportent *lookup_junction(char *dom, const char *pathname,
struct addrinfo *ai)
{
struct exportent *parent, *exp = NULL;
struct nfs_fsloc_set *locations;
int status;
xmlInitParser();
if (nfs_is_junction(pathname)) {
xlog(D_GENERAL, "%s: %s is not a junction",
__func__, pathname);
goto out;
}
status = nfs_get_basic_junction(pathname, &locations);
if (status) {
xlog(L_WARNING, "Dangling junction %s: %s",
pathname, strerror(status));
goto out;
}
parent = lookup_parent_export(dom, pathname, ai);
if (parent == NULL)
goto free_locations;
exp = locations_to_export(locations, pathname, parent);
free_locations:
nfs_free_locations(locations->ns_list);
free(locations);
out:
xmlCleanupParser();
return exp;
}
static void lookup_nonexport(int f, char *buf, int buflen, char *dom, char *path,
struct addrinfo *ai)
{
struct exportent *eep;
eep = lookup_junction(dom, path, ai);
dump_to_cache(f, buf, buflen, dom, path, eep, 0);
if (eep == NULL)
return;
exportent_release(eep);
free(eep);
}
#else /* !HAVE_JUNCTION_SUPPORT */
static void lookup_nonexport(int f, char *buf, int buflen, char *dom, char *path,
struct addrinfo *UNUSED(ai))
{
dump_to_cache(f, buf, buflen, dom, path, NULL, 0);
}
#endif /* !HAVE_JUNCTION_SUPPORT */
static void nfsd_export(int f)
{
/* requests are:
* domain path
* determine export options and return:
* domain path expiry flags anonuid anongid fsid
*/
char *dom, *path;
nfs_export *found = NULL;
struct addrinfo *ai = NULL;
char buf[RPC_CHAN_BUF_SIZE], *bp;
int blen;
blen = cache_read(f, buf, sizeof(buf));
if (blen <= 0 || buf[blen-1] != '\n') return;
buf[blen-1] = 0;
xlog(D_CALL, "nfsd_export: inbuf '%s'", buf);
bp = buf;
dom = malloc(blen);
path = malloc(blen);
if (!dom || !path)
goto out;
if (qword_get(&bp, dom, blen) <= 0)
goto out;
if (qword_get(&bp, path, blen) <= 0)
goto out;
auth_reload();
if (is_ipaddr_client(dom)) {
ai = lookup_client_addr(dom);
if (!ai)
goto out;
}
found = lookup_export(dom, path, ai);
if (found) {
char *mp = found->m_export.e_mountpoint;
if (mp && !*mp)
mp = found->m_export.e_path;
errno = 0;
if (mp && !is_mountpoint(mp)) {
if (errno != 0 && !path_lookup_error(errno))
goto out;
/* Exportpoint is not mounted, so tell kernel it is
* not available.
* This will cause it not to appear in the V4 Pseudo-root
* and so a "mount" of this path will fail, just like with
* V3.
* And filehandle for this mountpoint from an earlier
* mount will block in nfsd.fh lookup.
*/
xlog(L_WARNING,
"Cannot export path '%s': not a mountpoint",
path);
dump_to_cache(f, buf, sizeof(buf), dom, path,
NULL, 60);
} else if (dump_to_cache(f, buf, sizeof(buf), dom, path,
&found->m_export, 0) < 0) {
xlog(L_WARNING,
"Cannot export %s, possibly unsupported filesystem"
" or fsid= required", path);
dump_to_cache(f, buf, sizeof(buf), dom, path, NULL, 0);
}
} else
lookup_nonexport(f, buf, sizeof(buf), dom, path, ai);
out:
xlog(D_CALL, "nfsd_export: found %p path %s", found, path ? path : NULL);
if (dom) free(dom);
if (path) free(path);
nfs_freeaddrinfo(ai);
}
struct {
char *cache_name;
void (*cache_handle)(int f);
int f;
} cachelist[] = {
{ "auth.unix.ip", auth_unix_ip, -1 },
{ "auth.unix.gid", auth_unix_gid, -1 },
{ "nfsd.export", nfsd_export, -1 },
{ "nfsd.fh", nfsd_fh, -1 },
{ NULL, NULL, -1 }
};
extern int manage_gids;
/**
* cache_open - prepare communications channels with kernel RPC caches
*
*/
void cache_open(void)
{
int i;
for (i=0; cachelist[i].cache_name; i++ ) {
char path[100];
if (!manage_gids && cachelist[i].cache_handle == auth_unix_gid)
continue;
sprintf(path, "/proc/net/rpc/%s/channel", cachelist[i].cache_name);
cachelist[i].f = open(path, O_RDWR);
}
}
/**
* cache_set_fds - prepare cache file descriptors for one iteration of the service loop
* @fdset: pointer to fd_set to prepare
*/
void cache_set_fds(fd_set *fdset)
{
int i;
for (i=0; cachelist[i].cache_name; i++) {
if (cachelist[i].f >= 0)
FD_SET(cachelist[i].f, fdset);
}
}
/**
* cache_process_req - process any active cache file descriptors during service loop iteration
* @fdset: pointer to fd_set to examine for activity
*/
int cache_process_req(fd_set *readfds)
{
int i;
int cnt = 0;
for (i=0; cachelist[i].cache_name; i++) {
if (cachelist[i].f >= 0 &&
FD_ISSET(cachelist[i].f, readfds)) {
cnt++;
cachelist[i].cache_handle(cachelist[i].f);
FD_CLR(cachelist[i].f, readfds);
}
}
return cnt;
}
/**
* cache_process_loop - process incoming upcalls
*/
void cache_process_loop(void)
{
fd_set readfds;
int selret;
FD_ZERO(&readfds);
for (;;) {
cache_set_fds(&readfds);
v4clients_set_fds(&readfds);
selret = select(FD_SETSIZE, &readfds,
(void *) 0, (void *) 0, (struct timeval *) 0);
switch (selret) {
case -1:
if (errno == EINTR || errno == ECONNREFUSED
|| errno == ENETUNREACH || errno == EHOSTUNREACH)
continue;
xlog(L_ERROR, "my_svc_run() - select: %m");
return;
default:
cache_process_req(&readfds);
v4clients_process(&readfds);
}
}
}
/*
* Give IP->domain and domain+path->options to kernel
* % echo nfsd $IP $[now+DEFAULT_TTL] $domain > /proc/net/rpc/auth.unix.ip/channel
* % echo $domain $path $[now+DEFAULT_TTL] $options $anonuid $anongid $fsid > /proc/net/rpc/nfsd.export/channel
*/
static int cache_export_ent(char *buf, int buflen, char *domain, struct exportent *exp, char *path)
{
int f, err;
f = open("/proc/net/rpc/nfsd.export/channel", O_WRONLY);
if (f < 0) return -1;
err = dump_to_cache(f, buf, buflen, domain, exp->e_path, exp, 0);
if (err) {
xlog(L_WARNING,
"Cannot export %s, possibly unsupported filesystem or"
" fsid= required", exp->e_path);
}
while (err == 0 && (exp->e_flags & NFSEXP_CROSSMOUNT) && path) {
/* really an 'if', but we can break out of
* a 'while' more easily */
/* Look along 'path' for other filesystems
* and export them with the same options
*/
struct stat stb;
size_t l = strlen(exp->e_path);
dev_t dev;
if (strlen(path) <= l || path[l] != '/' ||
strncmp(exp->e_path, path, l) != 0)
break;
if (nfsd_path_stat(exp->e_path, &stb) != 0)
break;
dev = stb.st_dev;
while(path[l] == '/') {
char c;
/* errors for submount should fail whole filesystem */
int err2;
l++;
while (path[l] != '/' && path[l])
l++;
c = path[l];
path[l] = 0;
err2 = nfsd_path_lstat(path, &stb);
path[l] = c;
if (err2 < 0)
break;
if (stb.st_dev == dev)
continue;
dev = stb.st_dev;
path[l] = 0;
dump_to_cache(f, buf, buflen, domain, path, exp, 0);
path[l] = c;
}
break;
}
close(f);
return err;
}
/**
* cache_export - Inform kernel of a new nfs_export
* @exp: target nfs_export
* @path: NUL-terminated C string containing export path
*/
int cache_export(nfs_export *exp, char *path)
{
char ip[INET6_ADDRSTRLEN];
char buf[RPC_CHAN_BUF_SIZE], *bp;
int blen, f;
f = open("/proc/net/rpc/auth.unix.ip/channel", O_WRONLY);
if (f < 0)
return -1;
bp = buf, blen = sizeof(buf);
qword_add(&bp, &blen, "nfsd");
qword_add(&bp, &blen, host_ntop(get_addrlist(exp->m_client, 0), ip, sizeof(ip)));
qword_adduint(&bp, &blen, time(0) + exp->m_export.e_ttl);
qword_add(&bp, &blen, exp->m_client->m_hostname);
qword_addeol(&bp, &blen);
if (blen <= 0 || cache_write(f, buf, bp - buf) != bp - buf) blen = -1;
close(f);
if (blen < 0) return -1;
return cache_export_ent(buf, sizeof(buf), exp->m_client->m_hostname, &exp->m_export, path);
}
/**
* cache_get_filehandle - given an nfs_export, get its root filehandle
* @exp: target nfs_export
* @len: length of requested file handle
* @p: NUL-terminated C string containing export path
*
* Returns pointer to NFS file handle of root directory of export
*
* {
* echo $domain $path $length
* read filehandle <&0
* } <> /proc/fs/nfsd/filehandle
*/
struct nfs_fh_len *
cache_get_filehandle(nfs_export *exp, int len, char *p)
{
static struct nfs_fh_len fh;
char buf[RPC_CHAN_BUF_SIZE], *bp;
int blen, f;
f = open("/proc/fs/nfsd/filehandle", O_RDWR);
if (f < 0) {
f = open("/proc/fs/nfs/filehandle", O_RDWR);
if (f < 0) return NULL;
}
bp = buf, blen = sizeof(buf);
qword_add(&bp, &blen, exp->m_client->m_hostname);
qword_add(&bp, &blen, p);
qword_addint(&bp, &blen, len);
qword_addeol(&bp, &blen);
if (blen <= 0 || cache_write(f, buf, bp - buf) != bp - buf) {
close(f);
return NULL;
}
bp = buf;
blen = cache_read(f, buf, sizeof(buf));
close(f);
if (blen <= 0 || buf[blen-1] != '\n')
return NULL;
buf[blen-1] = 0;
memset(fh.fh_handle, 0, sizeof(fh.fh_handle));
fh.fh_size = qword_get(&bp, (char *)fh.fh_handle, NFS3_FHSIZE);
return &fh;
}
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