X-Git-Url: https://git.decadent.org.uk/gitweb/?p=nfs-utils.git;a=blobdiff_plain;f=support%2Fnfs%2Fexports.c;h=c250383a1b2fe2ada93bc5c8bf172fc02e3ad49b;hp=ea96400d79ca73f9292855a06d593c9ae3eea716;hb=56f537535190d034039570bafd9a0de71b79b8f1;hpb=e9b0bed761bc77ba046f53be2ec324c4b61357ff

diff --git a/support/nfs/exports.c b/support/nfs/exports.c
index ea96400..c250383 100644
--- a/support/nfs/exports.c
+++ b/support/nfs/exports.c
@@ -84,6 +84,32 @@ setexportent(char *fname, char *type)
 	first = 1;
 }
 
+static void init_exportent (struct exportent *ee, int fromkernel)
+{
+	ee->e_flags = EXPORT_DEFAULT_FLAGS;
+	/* some kernels assume the default is sync rather than
+	 * async.  More recent kernels always report one or other,
+	 * but this test makes sure we assume same as kernel
+	 * Ditto for wgather
+	 */
+	if (fromkernel) {
+		ee->e_flags &= ~NFSEXP_ASYNC;
+		ee->e_flags &= ~NFSEXP_GATHERED_WRITES;
+	}
+	ee->e_anonuid = 65534;
+	ee->e_anongid = 65534;
+	ee->e_squids = NULL;
+	ee->e_sqgids = NULL;
+	ee->e_mountpoint = NULL;
+	ee->e_fslocmethod = FSLOC_NONE;
+	ee->e_fslocdata = NULL;
+	ee->e_secinfo[0].flav = NULL;
+	ee->e_nsquids = 0;
+	ee->e_nsqgids = 0;
+	ee->e_uuid = NULL;
+	ee->e_ttl = DEFAULT_TTL;
+}
+
 struct exportent *
 getexportent(int fromkernel, int fromexports)
 {
@@ -102,32 +128,12 @@ getexportent(int fromkernel, int fromexports)
 		has_default_opts = 0;
 		has_default_subtree_opts = 0;
 	
-		def_ee.e_flags = EXPORT_DEFAULT_FLAGS;
-		/* some kernels assume the default is sync rather than
-		 * async.  More recent kernels always report one or other,
-		 * but this test makes sure we assume same as kernel
-		 * Ditto for wgather
-		 */
-		if (fromkernel) {
-			def_ee.e_flags &= ~NFSEXP_ASYNC;
-			def_ee.e_flags &= ~NFSEXP_GATHERED_WRITES;
-		}
-		def_ee.e_anonuid = 65534;
-		def_ee.e_anongid = 65534;
-		def_ee.e_squids = NULL;
-		def_ee.e_sqgids = NULL;
-		def_ee.e_mountpoint = NULL;
-		def_ee.e_fslocmethod = FSLOC_NONE;
-		def_ee.e_fslocdata = NULL;
-		def_ee.e_nsquids = 0;
-		def_ee.e_nsqgids = 0;
+		init_exportent(&def_ee, fromkernel);
 
 		ok = getpath(def_ee.e_path, sizeof(def_ee.e_path));
 		if (ok <= 0)
 			return NULL;
 
-		strncpy (def_ee.m_path, def_ee.e_path, sizeof (def_ee.m_path) - 1);
-		def_ee.m_path [sizeof (def_ee.m_path) - 1] = '\0';
 		ok = getexport(exp, sizeof(exp));
 	}
 	if (ok < 0) {
@@ -136,9 +142,14 @@ getexportent(int fromkernel, int fromexports)
 		return NULL;
 	}
 	first = 0;
-		
-	/* Check for default options */
-	if (exp[0] == '-') {
+
+	/*
+	 * Check for default options.  The kernel will never have default
+	 * options in /proc/fs/nfs/exports, however due to the initial '-' in
+	 * the -test-client- string from the test export we have to check that
+	 * we're not reading from the kernel.
+	 */
+	if (exp[0] == '-' && !fromkernel) {
 		if (parseopts(exp + 1, &def_ee, 0, &has_default_subtree_opts) < 0)
 			return NULL;
 		
@@ -175,13 +186,8 @@ getexportent(int fromkernel, int fromexports)
 		if (!has_default_opts)
 			xlog(L_WARNING, "No options for %s %s: suggest %s(sync) to avoid warning", ee.e_path, exp, exp);
 	}
-	if (strlen(hostname) >= sizeof(ee.e_hostname)) {
-		syntaxerr("client name too long");
-		export_errno = EINVAL;
-		return NULL;
-	}
-	strncpy(ee.e_hostname, hostname, sizeof (ee.e_hostname) - 1);
-	ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0';
+	xfree(ee.e_hostname);
+	ee.e_hostname = xstrdup(hostname);
 
 	if (parseopts(opt, &ee, fromexports && !has_default_subtree_opts, NULL) < 0)
 		return NULL;
@@ -191,13 +197,32 @@ getexportent(int fromkernel, int fromexports)
 		rpath[sizeof (rpath) - 1] = '\0';
 		strncpy(ee.e_path, rpath, sizeof (ee.e_path) - 1);
 		ee.e_path[sizeof (ee.e_path) - 1] = '\0';
-		strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
-		ee.m_path [sizeof (ee.m_path) - 1] = '\0';
 	}
 
 	return &ee;
 }
 
+void secinfo_show(FILE *fp, struct exportent *ep)
+{
+	struct sec_entry *p1, *p2;
+	int flags;
+
+	for (p1=ep->e_secinfo; p1->flav; p1=p2) {
+
+		fprintf(fp, ",sec=%s", p1->flav->flavour);
+		for (p2=p1+1; (p2->flav != NULL) && (p1->flags == p2->flags);
+								p2++) {
+			fprintf(fp, ":%s", p2->flav->flavour);
+		}
+		flags = p1->flags;
+		fprintf(fp, ",%s", (flags & NFSEXP_READONLY) ? "ro" : "rw");
+		fprintf(fp, ",%sroot_squash", (flags & NFSEXP_ROOTSQUASH)?
+				"" : "no_");
+		fprintf(fp, ",%sall_squash", (flags & NFSEXP_ALLSQUASH)?
+				"" : "no_");
+	}
+}
+
 void
 putexportent(struct exportent *ep)
 {
@@ -278,7 +303,9 @@ putexportent(struct exportent *ep)
 			else
 				fprintf(fp, "%d,", id[i]);
 	}
-	fprintf(fp, "anonuid=%d,anongid=%d)\n", ep->e_anonuid, ep->e_anongid);
+	fprintf(fp, "anonuid=%d,anongid=%d", ep->e_anonuid, ep->e_anongid);
+	secinfo_show(fp, ep);
+	fprintf(fp, ")\n");
 }
 
 void
@@ -311,6 +338,9 @@ dupexportent(struct exportent *dst, struct exportent *src)
 		dst->e_mountpoint = strdup(src->e_mountpoint);
 	if (src->e_fslocdata)
 		dst->e_fslocdata = strdup(src->e_fslocdata);
+	if (src->e_uuid)
+		dst->e_uuid = strdup(src->e_uuid);
+	dst->e_hostname = NULL;
 }
 
 struct exportent *
@@ -318,32 +348,17 @@ mkexportent(char *hname, char *path, char *options)
 {
 	static struct exportent	ee;
 
-	ee.e_flags = EXPORT_DEFAULT_FLAGS;
-	ee.e_anonuid = 65534;
-	ee.e_anongid = 65534;
-	ee.e_squids = NULL;
-	ee.e_sqgids = NULL;
-	ee.e_mountpoint = NULL;
-	ee.e_fslocmethod = FSLOC_NONE;
-	ee.e_fslocdata = NULL;
-	ee.e_nsquids = 0;
-	ee.e_nsqgids = 0;
-	ee.e_uuid = NULL;
-
-	if (strlen(hname) >= sizeof(ee.e_hostname)) {
-		xlog(L_WARNING, "client name %s too long", hname);
-		return NULL;
-	}
-	strncpy(ee.e_hostname, hname, sizeof (ee.e_hostname) - 1);
-	ee.e_hostname[sizeof (ee.e_hostname) - 1] = '\0';
+	init_exportent(&ee, 0);
+
+	xfree(ee.e_hostname);
+	ee.e_hostname = xstrdup(hname);
+
 	if (strlen(path) >= sizeof(ee.e_path)) {
 		xlog(L_WARNING, "path name %s too long", path);
 		return NULL;
 	}
 	strncpy(ee.e_path, path, sizeof (ee.e_path));
 	ee.e_path[sizeof (ee.e_path) - 1] = '\0';
-	strncpy (ee.m_path, ee.e_path, sizeof (ee.m_path) - 1);
-	ee.m_path [sizeof (ee.m_path) - 1] = '\0';
 	if (parseopts(options, &ee, 0, NULL) < 0)
 		return NULL;
 	return &ee;
@@ -368,6 +383,108 @@ static int valid_uuid(char *uuid)
 	return cnt == 32;
 }
 
+/*
+ * Append the given flavor to the exportent's e_secinfo array, or
+ * do nothing if it's already there.  Returns the index of flavor
+ * in the resulting array in any case.
+ */
+int secinfo_addflavor(struct flav_info *flav, struct exportent *ep)
+{
+	struct sec_entry *p;
+
+	for (p=ep->e_secinfo; p->flav; p++) {
+		if (p->flav == flav)
+			return p - ep->e_secinfo;
+	}
+	if (p - ep->e_secinfo >= SECFLAVOR_COUNT) {
+		xlog(L_ERROR, "more than %d security flavors on an export\n",
+			SECFLAVOR_COUNT);
+		return -1;
+	}
+	p->flav = flav;
+	p->flags = ep->e_flags;
+	(p+1)->flav = NULL;
+	return p - ep->e_secinfo;
+}
+
+static struct flav_info *find_flavor(char *name)
+{
+	struct flav_info *flav;
+	for (flav = flav_map; flav < flav_map + flav_map_size; flav++)
+		if (strcmp(flav->flavour, name) == 0)
+			return flav;
+	return NULL;
+}
+
+/* @str is a colon seperated list of security flavors.  Their order
+ * is recorded in @ep, and a bitmap corresponding to the list is returned.
+ * A zero return indicates an error.
+ */
+static unsigned int parse_flavors(char *str, struct exportent *ep)
+{
+	unsigned int out=0;
+	char *flavor;
+	int bit;
+
+	while ( (flavor=strsep(&str, ":")) ) {
+		struct flav_info *flav = find_flavor(flavor);
+		if (flav == NULL) {
+			xlog(L_ERROR, "unknown flavor %s\n", flavor);
+			return 0;
+		}
+		bit = secinfo_addflavor(flav, ep);
+		if (bit < 0)
+			return 0;
+		out |= 1<<bit;
+	}
+	return out;
+}
+
+/* Sets the bits in @mask for the appropriate security flavor flags. */
+static void setflags(int mask, unsigned int active, struct exportent *ep)
+{
+	int bit=0;
+
+	ep->e_flags |= mask;
+
+	while (active) {
+		if (active & 1)
+			ep->e_secinfo[bit].flags |= mask;
+		bit++;
+		active >>= 1;
+	}
+}
+
+/* Clears the bits in @mask for the appropriate security flavor flags. */
+static void clearflags(int mask, unsigned int active, struct exportent *ep)
+{
+	int bit=0;
+
+	ep->e_flags &= ~mask;
+
+	while (active) {
+		if (active & 1)
+			ep->e_secinfo[bit].flags &= ~mask;
+		bit++;
+		active >>= 1;
+	}
+}
+
+/*
+ * For those flags which are not allowed to vary by pseudoflavor,
+ * ensure that the export flags agree with the flags on each
+ * pseudoflavor:
+ */
+static void fix_pseudoflavor_flags(struct exportent *ep)
+{
+	struct export_features *ef;
+	struct sec_entry *p;
+
+	ef = get_export_features();
+	for (p = ep->e_secinfo; p->flav; p++)
+		p->flags |= ep->e_flags & ~ef->secinfo_flags;
+}
+
 /*
  * Parse option string pointed to by cp and set mount options accordingly.
  */
@@ -377,10 +494,10 @@ parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr)
 	int	had_subtree_opt = 0;
 	char 	*flname = efname?efname:"command line";
 	int	flline = efp?efp->x_line:0;
+	unsigned int active = 0;
 
 	squids = ep->e_squids; nsquids = ep->e_nsquids;
 	sqgids = ep->e_sqgids; nsqgids = ep->e_nsqgids;
-
 	if (!cp)
 		goto out;
 
@@ -399,55 +516,55 @@ parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr)
 
 		/* process keyword */
 		if (strcmp(opt, "ro") == 0)
-			ep->e_flags |= NFSEXP_READONLY;
+			setflags(NFSEXP_READONLY, active, ep);
 		else if (strcmp(opt, "rw") == 0)
-			ep->e_flags &= ~NFSEXP_READONLY;
+			clearflags(NFSEXP_READONLY, active, ep);
 		else if (!strcmp(opt, "secure"))
-			ep->e_flags &= ~NFSEXP_INSECURE_PORT;
+			clearflags(NFSEXP_INSECURE_PORT, active, ep);
 		else if (!strcmp(opt, "insecure"))
-			ep->e_flags |= NFSEXP_INSECURE_PORT;
+			setflags(NFSEXP_INSECURE_PORT, active, ep);
 		else if (!strcmp(opt, "sync"))
-			ep->e_flags &= ~NFSEXP_ASYNC;
+			clearflags(NFSEXP_ASYNC, active, ep);
 		else if (!strcmp(opt, "async"))
-			ep->e_flags |= NFSEXP_ASYNC;
+			setflags(NFSEXP_ASYNC, active, ep);
 		else if (!strcmp(opt, "nohide"))
-			ep->e_flags |= NFSEXP_NOHIDE;
+			setflags(NFSEXP_NOHIDE, active, ep);
 		else if (!strcmp(opt, "hide"))
-			ep->e_flags &= ~NFSEXP_NOHIDE;
+			clearflags(NFSEXP_NOHIDE, active, ep);
 		else if (!strcmp(opt, "crossmnt"))
-			ep->e_flags |= NFSEXP_CROSSMOUNT;
+			setflags(NFSEXP_CROSSMOUNT, active, ep);
 		else if (!strcmp(opt, "nocrossmnt"))
-			ep->e_flags &= ~NFSEXP_CROSSMOUNT;
+			clearflags(NFSEXP_CROSSMOUNT, active, ep);
 		else if (!strcmp(opt, "wdelay"))
-			ep->e_flags |= NFSEXP_GATHERED_WRITES;
+			setflags(NFSEXP_GATHERED_WRITES, active, ep);
 		else if (!strcmp(opt, "no_wdelay"))
-			ep->e_flags &= ~NFSEXP_GATHERED_WRITES;
+			clearflags(NFSEXP_GATHERED_WRITES, active, ep);
 		else if (strcmp(opt, "root_squash") == 0)
-			ep->e_flags |= NFSEXP_ROOTSQUASH;
+			setflags(NFSEXP_ROOTSQUASH, active, ep);
 		else if (!strcmp(opt, "no_root_squash"))
-			ep->e_flags &= ~NFSEXP_ROOTSQUASH;
+			clearflags(NFSEXP_ROOTSQUASH, active, ep);
 		else if (strcmp(opt, "all_squash") == 0)
-			ep->e_flags |= NFSEXP_ALLSQUASH;
+			setflags(NFSEXP_ALLSQUASH, active, ep);
 		else if (strcmp(opt, "no_all_squash") == 0)
-			ep->e_flags &= ~NFSEXP_ALLSQUASH;
+			clearflags(NFSEXP_ALLSQUASH, active, ep);
 		else if (strcmp(opt, "subtree_check") == 0) {
 			had_subtree_opt = 1;
-			ep->e_flags &= ~NFSEXP_NOSUBTREECHECK;
+			clearflags(NFSEXP_NOSUBTREECHECK, active, ep);
 		} else if (strcmp(opt, "no_subtree_check") == 0) {
 			had_subtree_opt = 1;
-			ep->e_flags |= NFSEXP_NOSUBTREECHECK;
+			setflags(NFSEXP_NOSUBTREECHECK, active, ep);
 		} else if (strcmp(opt, "auth_nlm") == 0)
-			ep->e_flags &= ~NFSEXP_NOAUTHNLM;
+			clearflags(NFSEXP_NOAUTHNLM, active, ep);
 		else if (strcmp(opt, "no_auth_nlm") == 0)
-			ep->e_flags |= NFSEXP_NOAUTHNLM;
+			setflags(NFSEXP_NOAUTHNLM, active, ep);
 		else if (strcmp(opt, "secure_locks") == 0)
-			ep->e_flags &= ~NFSEXP_NOAUTHNLM;
+			clearflags(NFSEXP_NOAUTHNLM, active, ep);
 		else if (strcmp(opt, "insecure_locks") == 0)
-			ep->e_flags |= NFSEXP_NOAUTHNLM;
+			setflags(NFSEXP_NOAUTHNLM, active, ep);
 		else if (strcmp(opt, "acl") == 0)
-			ep->e_flags &= ~NFSEXP_NOACL;
+			clearflags(NFSEXP_NOACL, active, ep);
 		else if (strcmp(opt, "no_acl") == 0)
-			ep->e_flags |= NFSEXP_NOACL;
+			setflags(NFSEXP_NOACL, active, ep);
 		else if (strncmp(opt, "anonuid=", 8) == 0) {
 			char *oe;
 			ep->e_anonuid = strtol(opt+8, &oe, 10);
@@ -479,13 +596,13 @@ bad_option:
 			char *oe;
 			if (strcmp(opt+5, "root") == 0) {
 				ep->e_fsid = 0;
-				ep->e_flags |= NFSEXP_FSID;
+				setflags(NFSEXP_FSID, active, ep);
 			} else {
 				ep->e_fsid = strtoul(opt+5, &oe, 0);
 				if (opt[5]!='\0' && *oe == '\0') 
-					ep->e_flags |= NFSEXP_FSID;
+					setflags(NFSEXP_FSID, active, ep);
 				else if (valid_uuid(opt+5))
-					ep->e_uuid = strdup(opt+7);
+					ep->e_uuid = strdup(opt+5);
 				else {
 					xlog(L_ERROR, "%s: %d: bad fsid \"%s\"\n",
 					     flname, flline, opt);	
@@ -517,10 +634,14 @@ bad_option:
 		} else if (strncmp(opt, "replicas=", 9) == 0) {
 			ep->e_fslocmethod = FSLOC_REPLICA;
 			ep->e_fslocdata = strdup(opt+9);
+		} else if (strncmp(opt, "sec=", 4) == 0) {
+			active = parse_flavors(opt+4, ep);
+			if (!active)
+				goto bad_option;
 		} else {
 			xlog(L_ERROR, "%s:%d: unknown keyword \"%s\"\n",
 					flname, flline, opt);
-			ep->e_flags |= NFSEXP_ALLSQUASH | NFSEXP_READONLY;
+			setflags(NFSEXP_ALLSQUASH | NFSEXP_READONLY, active, ep);
 			goto bad_option;
 		}
 		free(opt);
@@ -528,6 +649,7 @@ bad_option:
 			cp++;
 	}
 
+	fix_pseudoflavor_flags(ep);
 	ep->e_squids = squids;
 	ep->e_sqgids = sqgids;
 	ep->e_nsquids = nsquids;
@@ -644,4 +766,34 @@ syntaxerr(char *msg)
 	xlog(L_ERROR, "%s:%d: syntax error: %s",
 			efname, efp?efp->x_line:0, msg);
 }
-
+struct export_features *get_export_features(void)
+{
+	static char *path = "/proc/fs/nfsd/export_features";
+	static struct export_features ef;
+	static int cached = 0;
+	char buf[50];
+	int c;
+	int fd;
+
+	if (cached)
+		return &ef;
+
+	ef.flags = NFSEXP_OLDFLAGS;
+	ef.secinfo_flags = NFSEXP_OLD_SECINFO_FLAGS;
+
+	fd = open(path, O_RDONLY);
+	if (fd == -1)
+		goto good;
+	fd = read(fd, buf, 50);
+	if (fd == -1)
+		goto err;
+	c = sscanf(buf, "%x %x", &ef.flags, &ef.secinfo_flags);
+	if (c != 2)
+		goto err;
+good:
+	cached = 1;
+	return &ef;
+err:
+	xlog(L_WARNING, "unexpected error reading %s", path);
+	return &ef;
+}