glusterd: TLS verification fails while using intermediate CA

Problem: TLS verification fails while using intermediate CA
         if mgmt SSL is enabled.

Solution: There are two main issue of TLS verification failing
          1) not calling ssl_api to set cert_depth
          2) The current code does not allow to set certificate depth
             while MGMT SSL is enabled.
          After apply this patch to set certificate depth user
          need to set parameter option transport.socket.ssl-cert-depth <depth>
          in /var/lib/glusterd/secure_acccess instead to set in
          /etc/glusterfs/glusterd.vol. At the time of set secure_mgmt in ctx
          we will check the value of cert-depth and save the value of cert-depth
          in ctx.If user does not provide any value in cert-depth in that case
          it will consider default value is 1

BUG: 1555154
Change-Id: I89e9a9e1026e37efb5c20f9ec62b1989ef644f35
Signed-off-by: Mohit Agrawal <moagrawa@redhat.com>

3 files changed, 49 insertions, 2 deletions

diff --git a/libglusterfs/src/glusterfs.h b/libglusterfs/src/glusterfs.h
index 6b0df533e69..250d8e69a4f 100644
--- a/libglusterfs/src/glusterfs.h
+++ b/libglusterfs/src/glusterfs.h
@@ -593,6 +593,11 @@ struct _glusterfs_ctx {
          */
         int                secure_mgmt;
 
+        /* The option is use to set cert_depth while management connection
+           use SSL
+         */
+        int                ssl_cert_depth;
+
         /*
          * Should *our* server/inbound connections use SSL?  This is only true
          * if we're glusterd and secure_mgmt is set, or if we're glusterfsd
@@ -700,4 +705,5 @@ int glusterfs_graph_parent_up (glusterfs_graph_t *graph);
 void
 gf_free_mig_locks (lock_migration_info_t *locks);
 
+int glusterfs_read_secure_access_file (void);
 #endif /* _GLUSTERFS_H */
diff --git a/libglusterfs/src/graph.c b/libglusterfs/src/graph.c
index db80e21272a..d36cf7b3da5 100644
--- a/libglusterfs/src/graph.c
+++ b/libglusterfs/src/graph.c
@@ -16,7 +16,7 @@
 #include "defaults.h"
 #include <unistd.h>
 #include "syscall.h"
-
+#include <regex.h>
 #include "libglusterfs-messages.h"
 
 #if 0
@@ -68,7 +68,47 @@ _gf_dump_details (int argc, char **argv)
 }
 #endif
 
+int
+glusterfs_read_secure_access_file (void)
+{
+        FILE *fp = NULL;
+        char  line[100] = {0,};
+        int   cert_depth = 1;   /* Default SSL CERT DEPTH */
+        regex_t regcmpl;
+        char *key = {"^option transport.socket.ssl-cert-depth"};
+        char  keyval[50] = {0,};
+        int start = 0, end = 0, copy_len = 0;
+        regmatch_t result[1] = {{0} };
+
+        fp = fopen (SECURE_ACCESS_FILE, "r");
+        if (!fp)
+                goto out;
 
+        /* Check if any line matches with key */
+        while (fgets(line, sizeof(line), fp) != NULL) {
+                if (regcomp (&regcmpl, key, REG_EXTENDED)) {
+                        goto out;
+                }
+                if (!regexec (&regcmpl, line, 1, result, 0)) {
+                        start = result[0].rm_so;
+                        end  = result[0].rm_eo;
+                        copy_len = end - start;
+                        strcpy (keyval, line+copy_len);
+                        if (keyval[0]) {
+                                cert_depth = atoi(keyval);
+                                if (cert_depth == 0)
+                                        cert_depth = 1; /* Default SSL CERT DEPTH */
+                                break;
+                        }
+                }
+                regfree(&regcmpl);
+        }
+
+out:
+        if (fp)
+                fclose (fp);
+        return cert_depth;
+}
 
 int
 glusterfs_xlator_link (xlator_t *pxl, xlator_t *cxl)
diff --git a/libglusterfs/src/libglusterfs.sym b/libglusterfs/src/libglusterfs.sym
index df97a7fd89a..6340bc8a3a2 100644
--- a/libglusterfs/src/libglusterfs.sym
+++ b/libglusterfs/src/libglusterfs.sym
@@ -733,6 +733,7 @@ glusterfs_graph_deactivate
 glusterfs_graph_destroy
 glusterfs_graph_destroy_residual
 glusterfs_graph_prepare
+glusterfs_read_secure_access_file
 glusterfs_graph_print_file
 glusterfs_graph_set_first
 glusterfs_is_local_pathinfo
@@ -1107,4 +1108,4 @@ use_spinlocks
 dump_options
 glusterfs_leaseid_buf_get
 gf_replace_old_iatt_in_dict
-gf_replace_new_iatt_in_dict
\ No newline at end of file
+gf_replace_new_iatt_in_dict