librhsm/0005-Fix-relocating-certificate-paths-to-etc-rhsm-host.patch

From 09f9b923f04a8276252fcfbc4f502be49df483c6 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Petr=20P=C3=ADsa=C5=99?= <ppisar@redhat.com>
Date: Fri, 27 Oct 2023 15:34:16 +0200
Subject: [PATCH] Fix relocating certificate paths to /etc/rhsm-host
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If /etc/rhsm-host directory exists, librhsm corrects CA certificate
location (rhsm_context_get_ca_cert_dir()) and YUM repository CA
certificate location (rhsm_context_get_repo_ca_cert()) from /etc/rhsm
to /etc/rhsm-host prefix.

However, there was a bug in the path relocation and, as a result, the
locations were mangled to a wrong /etc/rhsm-host-host prefix.

This patch fixes the relocation algorithm to consider boundaries
between the path components.

Note that the relocation was and still is applied not only to default
values, but also to values loaded from a configuration file. That's
probably on purpose to ease sharing the configuration among a host and
the containers.

https://github.com/rpm-software-management/librhsm/issues/9
Signed-off-by: Petr Písař <ppisar@redhat.com>
---
 rhsm/rhsm-context.c | 61 ++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 58 insertions(+), 3 deletions(-)

diff --git a/rhsm/rhsm-context.c b/rhsm/rhsm-context.c
index 311dcdd..e0302fd 100644
--- a/rhsm/rhsm-context.c
+++ b/rhsm/rhsm-context.c
@@ -482,6 +482,61 @@ rhsm_context_set_property (GObject      *object,
     }
 }
 
+/*
+ * path_has_prefix:
+ * @path: pointer to a null-terminated path string.
+ * @prefix: pointer to a null-terminated path prefix without a trailing slash.
+ *
+ * Returns: TRUE if the @prefix is a base path of the @path. FALSE otherwise.
+ */
+
+static gboolean
+path_has_prefix (const gchar *path, const gchar *prefix)
+{
+  if (!path || !prefix)
+    {
+      return FALSE;
+    }
+    {
+      const size_t prefix_length = strlen (prefix);
+      return (!strncmp (path, prefix, prefix_length) &&
+              (G_IS_DIR_SEPARATOR (path [prefix_length]) || path [prefix_length] == '\0'));
+    }
+}
+
+/*
+ * relocate_path:
+ * @path: (inout): pointer to a null-terminated string.
+ * @old_prefix: null-terminated path prefix without a trailing slash to relocate from.
+ * @new_prefix: null-terminated path prefix without a trailing slash to relocate to.
+ *
+ * If @path starts with @old_prefix path components, the @old_prefix path
+ * components will be replaced with @new_prefix.
+ *
+ * Returns: (transfer none): null-terminated string with the relocated path.
+ */
+static gchar *
+relocate_path (gchar **path, const gchar *old_prefix, const gchar *new_prefix)
+{
+  if (!path || !*path || !old_prefix || !new_prefix)
+    {
+      return NULL;
+    }
+
+  if (path_has_prefix (*path, old_prefix))
+    {
+      const size_t old_prefix_length = strlen (old_prefix);
+      GString *tmp = g_string_sized_new (strlen (*path) - old_prefix_length + strlen (new_prefix));
+      g_string_append (tmp, new_prefix);
+      g_string_append (tmp, *path + old_prefix_length);
+
+      g_free (*path);
+      *path = g_string_free (tmp, FALSE);
+    }
+
+  return *path;
+}
+
 static void
 rhsm_context_constructed (GObject *object)
 {
@@ -539,10 +594,10 @@ rhsm_context_constructed (GObject *object)
     }
 
   /* If we have conf coming from /etc/rhsm-host, most probably we need to replace /etc/rhsm */
-  if (g_str_has_prefix (ctx->conf_file, CONFIG_DIR_HOST))
+  if (path_has_prefix (ctx->conf_file, CONFIG_DIR_HOST))
     {
-     rhsm_utils_str_replace (&ctx->ca_cert_dir, CONFIG_DIR, CONFIG_DIR_HOST);
-     rhsm_utils_str_replace (&ctx->repo_ca_cert, CONFIG_DIR, CONFIG_DIR_HOST);
+     relocate_path (&ctx->ca_cert_dir, CONFIG_DIR, CONFIG_DIR_HOST);
+     relocate_path (&ctx->repo_ca_cert, CONFIG_DIR, CONFIG_DIR_HOST);
    }
 }
 
-- 
2.41.0