Support sec= option to specify export security

This adds support for reading sec= option and sending security data
through cache via "... secinfo n flavor1 flag1 ... flavorN flagN".

If sec= is missing, no secinfo option will be passed down.

Signed-off-by: Fred Isaman <iisaman@citi.umich.edu>
Signed-off-by: "J. Bruce Fields" <bfields@citi.umich.edu>
Signed-off-by: Neil Brown <neilb@suse.de>

diff --git a/support/include/nfslib.h b/support/include/nfslib.h
index d4f4150152de5390a737d463b27bccf077f52a57..5af9c30c33b18d70864cde8c25a70cda1cb6cbf2 100644 (file)
--- a/support/include/nfslib.h
+++ b/support/include/nfslib.h
@@ -51,6 +51,14 @@
 #define        _PATH_PROC_EXPORTS_ALT  "/proc/fs/nfsd/exports"
 #endif
 
+/* Maximum number of security flavors on an export: */
+#define SECFLAVOR_COUNT 8
+
+struct sec_entry {
+       struct flav_info *flav;
+       int flags;
+};
+
 /*
  * Data related to a single exports entry as returned by getexportent.
  * FIXME: export options should probably be parsed at a later time to
@@ -76,6 +84,7 @@ struct exportent {
        int             e_fslocmethod;
        char *          e_fslocdata;
        char *          e_uuid;
+       struct sec_entry e_secinfo[SECFLAVOR_COUNT+1];
 };
 
 struct rmtabent {
@@ -89,6 +98,7 @@ struct rmtabent {
  */
 void                   setexportent(char *fname, char *type);
 struct exportent *     getexportent(int,int);
+void                   secinfo_show(FILE *fp, struct exportent *ep);
 void                   putexportent(struct exportent *xep);
 void                   endexportent(void);
 struct exportent *     mkexportent(char *hname, char *path, char *opts);

diff --git a/support/nfs/exports.c b/support/nfs/exports.c
index ea96400d79ca73f9292855a06d593c9ae3eea716..c82bb0ef29433048bf4b5b3e1eccecc0be9d79b5 100644 (file)
--- a/support/nfs/exports.c
+++ b/support/nfs/exports.c
@@ -119,6 +119,7 @@ getexportent(int fromkernel, int fromexports)
                def_ee.e_mountpoint = NULL;
                def_ee.e_fslocmethod = FSLOC_NONE;
                def_ee.e_fslocdata = NULL;
+               def_ee.e_secinfo[0].flav = NULL;
                def_ee.e_nsquids = 0;
                def_ee.e_nsqgids = 0;
 
@@ -198,6 +199,27 @@ getexportent(int fromkernel, int fromexports)
        return ⅇ
 }
 
+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 +300,9 @@ 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
@@ -326,6 +350,7 @@ mkexportent(char *hname, char *path, char *options)
        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;
@@ -368,19 +393,111 @@ 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.
+ */
+static 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;
+       }
+}
+
+/* options that can vary per flavor: */
+#define NFSEXP_SECINFO_FLAGS (NFSEXP_READONLY | NFSEXP_ROOTSQUASH \
+                                       | NFSEXP_ALLSQUASH)
+
 /*
  * Parse option string pointed to by cp and set mount options accordingly.
  */
 static int
 parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr)
 {
+       struct sec_entry *p;
        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;
 
@@ -399,9 +516,9 @@ 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;
                else if (!strcmp(opt, "insecure"))
@@ -423,13 +540,13 @@ parseopts(char *cp, struct exportent *ep, int warn, int *had_subtree_opt_ptr)
                else if (!strcmp(opt, "no_wdelay"))
                        ep->e_flags &= ~NFSEXP_GATHERED_WRITES;
                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;
@@ -517,6 +634,10 @@ 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);
@@ -528,6 +649,8 @@ bad_option:
                        cp++;
        }
 
+       for (p = ep->e_secinfo; p->flav; p++)
+               p->flags |= ep->e_flags & ~NFSEXP_SECINFO_FLAGS;
        ep->e_squids = squids;
        ep->e_sqgids = sqgids;
        ep->e_nsquids = nsquids;

diff --git a/utils/exportfs/exportfs.c b/utils/exportfs/exportfs.c
index 99618c94ee0ed0040f29a32246b3af50d2824539..18dfe5ad8046c124b7e2cb8fb76da6800eeb8dba 100644 (file)
--- a/utils/exportfs/exportfs.c
+++ b/utils/exportfs/exportfs.c
@@ -515,6 +515,7 @@ dump(int verbose)
                                break;
 #endif
                        }
+                       secinfo_show(stdout, ep);
                        printf("%c\n", (c != '(')? ')' : ' ');
                }
        }

diff --git a/utils/mountd/cache.c b/utils/mountd/cache.c
index d0688432b04aa8de76f1f636e137eeb343ce98e5..b686318c1017b0dd951bdc95bab27348a6db0071 100644 (file)
--- a/utils/mountd/cache.c
+++ b/utils/mountd/cache.c
@@ -30,6 +30,7 @@
 #include "mountd.h"
 #include "xmalloc.h"
 #include "fsloc.h"
+#include "pseudoflavors.h"
 
 #ifdef USE_BLKID
 #include "blkid/blkid.h"
@@ -518,6 +519,25 @@ static void write_fsloc(FILE *f, struct exportent *ep, char *path)
        release_replicas(servers);
 }
 
+static void write_secinfo(FILE *f, struct exportent *ep)
+{
+       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;
+       }
+       qword_print(f, "secinfo");
+       qword_printint(f, p - ep->e_secinfo);
+       for (p = ep->e_secinfo; p->flav; p++) {
+               qword_printint(f, p->flav->fnum);
+               qword_printint(f, p->flags);
+       }
+
+}
+
 static int dump_to_cache(FILE *f, char *domain, char *path, struct exportent *exp)
 {
        qword_print(f, domain);
@@ -529,6 +549,7 @@ static int dump_to_cache(FILE *f, char *domain, char *path, struct exportent *ex
                qword_printint(f, exp->e_anongid);
                qword_printint(f, exp->e_fsid);
                write_fsloc(f, exp, path);
+               write_secinfo(f, exp);
 #if USE_BLKID
                if (exp->e_uuid == NULL) {
                        char u[16];