kentpeacock / rpms / openssh

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diff -up openssh-6.3p1/auth-krb5.c.ccache_name openssh-6.3p1/auth-krb5.c
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--- openssh-6.3p1/auth-krb5.c.ccache_name	2013-10-23 22:03:52.322950759 +0200
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+++ openssh-6.3p1/auth-krb5.c	2013-10-23 22:04:24.295799873 +0200
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@@ -50,7 +50,9 @@
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 #include <errno.h>
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 #include <unistd.h>
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 #include <string.h>
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+#include <sys/stat.h>
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 #include <krb5.h>
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+#include <profile.h>
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 extern ServerOptions	 options;
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@@ -91,6 +93,7 @@ auth_krb5_password(Authctxt *authctxt, c
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 #endif
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 	krb5_error_code problem;
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 	krb5_ccache ccache = NULL;
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+	const char *ccache_type;
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 	int len;
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 	char *client, *platform_client;
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 	const char *errmsg;
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@@ -191,12 +194,30 @@ auth_krb5_password(Authctxt *authctxt, c
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 		goto out;
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 #endif
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+	ccache_type = krb5_cc_get_type(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
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 	authctxt->krb5_ticket_file = (char *)krb5_cc_get_name(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
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-	len = strlen(authctxt->krb5_ticket_file) + 6;
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+	if (authctxt->krb5_ticket_file[0] == ':')
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+		authctxt->krb5_ticket_file++;
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+
017ff1
+	len = strlen(authctxt->krb5_ticket_file) + strlen(ccache_type) + 2;
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 	authctxt->krb5_ccname = xmalloc(len);
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-	snprintf(authctxt->krb5_ccname, len, "FILE:%s",
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+
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+#ifdef USE_CCAPI
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+	snprintf(authctxt->krb5_ccname, len, "API:%s",
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 	    authctxt->krb5_ticket_file);
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+#else
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+	snprintf(authctxt->krb5_ccname, len, "%s:%s",
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+	    ccache_type, authctxt->krb5_ticket_file);
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+#endif
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+
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+	if (strcmp(ccache_type, "DIR") == 0) {
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+		char *p;
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+		p = strrchr(authctxt->krb5_ccname, '/');
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+		if (p)
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+			*p = '\0';
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+	}
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+
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 #ifdef USE_PAM
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 	if (options.use_pam)
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@@ -235,10 +256,34 @@ auth_krb5_password(Authctxt *authctxt, c
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 void
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 krb5_cleanup_proc(Authctxt *authctxt)
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 {
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+	struct stat krb5_ccname_stat;
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+	char krb5_ccname[128], *krb5_ccname_dir_start, *krb5_ccname_dir_end;
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+
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 	debug("krb5_cleanup_proc called");
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 	if (authctxt->krb5_fwd_ccache) {
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 		krb5_cc_destroy(authctxt->krb5_ctx, authctxt->krb5_fwd_ccache);
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 		authctxt->krb5_fwd_ccache = NULL;
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+
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+		strncpy(krb5_ccname, authctxt->krb5_ccname, sizeof(krb5_ccname) - 10);
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+		krb5_ccname_dir_start = strchr(krb5_ccname, ':') + 1;
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+		*krb5_ccname_dir_start++ = '\0';
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+		if (strcmp(krb5_ccname, "DIR") == 0) {
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+
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+			strcat(krb5_ccname_dir_start, "/primary");
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+
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+			if (stat(krb5_ccname_dir_start, &krb5_ccname_stat) == 0) {
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+				if (unlink(krb5_ccname_dir_start) == 0) {
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+					krb5_ccname_dir_end = strrchr(krb5_ccname_dir_start, '/');
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+					*krb5_ccname_dir_end = '\0';
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+					if (rmdir(krb5_ccname_dir_start) == -1)
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+						debug("cache dir '%s' remove failed: %s", krb5_ccname_dir_start, strerror(errno));
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+				}
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+				else
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+					debug("cache primary file '%s', remove failed: %s",
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+						krb5_ccname_dir_start, strerror(errno)
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+						);
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+			}
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+		}
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 	}
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 	if (authctxt->krb5_user) {
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 		krb5_free_principal(authctxt->krb5_ctx, authctxt->krb5_user);
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@@ -250,34 +295,139 @@ krb5_cleanup_proc(Authctxt *authctxt)
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 	}
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 }
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+int
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+ssh_asprintf_append(char **dsc, const char *fmt, ...) {
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+	char *src, *old;
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+	va_list ap;
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+	int i;
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+
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+	va_start(ap, fmt);
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+	i = vasprintf(&src, fmt, ap);
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+	va_end(ap);
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+
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+	if (i == -1 || src == NULL)
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+		return -1;
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+
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+	old = *dsc;
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+
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+	i = asprintf(dsc, "%s%s", *dsc, src);
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+	if (i == -1 || src == NULL) {
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+		free(src);
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+		return -1;
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+	}
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+
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+	free(old);
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+	free(src);
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+
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+	return i;
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+}
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+
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+int
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+ssh_krb5_expand_template(char **result, const char *template) {
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+	char *p_n, *p_o, *r, *tmp_template;
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+
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+	if (template == NULL)
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+		return -1;
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+
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+	tmp_template = p_n = p_o = xstrdup(template);
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+	r = xstrdup("");
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+
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+	while ((p_n = strstr(p_o, "%{")) != NULL) {
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+
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+		*p_n++ = '\0';
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+		if (ssh_asprintf_append(&r, "%s", p_o) == -1)
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+			goto cleanup;
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+
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+		if (strncmp(p_n, "{uid}", 5) == 0 || strncmp(p_n, "{euid}", 6) == 0 ||
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+			strncmp(p_n, "{USERID}", 8) == 0) {
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+			p_o = strchr(p_n, '}') + 1;
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+			if (ssh_asprintf_append(&r, "%d", geteuid()) == -1)
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+				goto cleanup;
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+			continue;
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+		}
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+		else if (strncmp(p_n, "{TEMP}", 6) == 0) {
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+			p_o = strchr(p_n, '}') + 1;
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+			if (ssh_asprintf_append(&r, "/tmp") == -1)
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+				goto cleanup;
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+			continue;
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+		} else {
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+			p_o = strchr(p_n, '}') + 1;
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+			p_o = '\0';
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+			debug("%s: unsupported token %s in %s", __func__, p_n, template);
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+			/* unknown token, fallback to the default */
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+			goto cleanup;
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+		}
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+	}
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+
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+	if (ssh_asprintf_append(&r, "%s", p_o) == -1)
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+		goto cleanup;
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+
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+	*result = r;
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+	free(tmp_template);
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+	return 0;
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+
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+cleanup:
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+	free(r);
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+	free(tmp_template);
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+	return -1;
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+}
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+
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+krb5_error_code
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+ssh_krb5_get_cctemplate(krb5_context ctx, char **ccname) {
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+	profile_t p;
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+	int ret = 0;
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+	char *value = NULL;
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+
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+	ret = krb5_get_profile(ctx, &p);
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+	if (ret)
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+		return ret;
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+
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+	ret = profile_get_string(p, "libdefaults", "default_ccache_name", NULL, NULL, &value);
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+	if (ret)
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+		return ret;
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+
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+	ret = ssh_krb5_expand_template(ccname, value);
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+
f09e2e
+	return ret;
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+}
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+
f09e2e
 #ifndef HEIMDAL
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 krb5_error_code
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 ssh_krb5_cc_gen(krb5_context ctx, krb5_ccache *ccache) {
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 	int tmpfd, ret, oerrno;
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-	char ccname[40];
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+	char *ccname;
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+#ifdef USE_CCAPI
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+	char cctemplate[] = "API:krb5cc_%d";
f09e2e
+#else
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 	mode_t old_umask;
f09e2e
+	char cctemplate[] = "FILE:/tmp/krb5cc_%d_XXXXXXXXXX";
f09e2e
 
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-	ret = snprintf(ccname, sizeof(ccname),
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-	    "FILE:/tmp/krb5cc_%d_XXXXXXXXXX", geteuid());
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-	if (ret < 0 || (size_t)ret >= sizeof(ccname))
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-		return ENOMEM;
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-
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-	old_umask = umask(0177);
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-	tmpfd = mkstemp(ccname + strlen("FILE:"));
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-	oerrno = errno;
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-	umask(old_umask);
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-	if (tmpfd == -1) {
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-		logit("mkstemp(): %.100s", strerror(oerrno));
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-		return oerrno;
f09e2e
-	}
f09e2e
+#endif
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+
f09e2e
+	ret = ssh_krb5_get_cctemplate(ctx, &ccname);
f09e2e
 
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-	if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
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+	if (ret) {
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+		ret = asprintf(&ccname, cctemplate, geteuid());
f09e2e
+		if (ret == -1)
f09e2e
+			return ENOMEM;
f09e2e
+		old_umask = umask(0177);
f09e2e
+		tmpfd = mkstemp(ccname + strlen("FILE:"));
f09e2e
 		oerrno = errno;
f09e2e
-		logit("fchmod(): %.100s", strerror(oerrno));
f09e2e
+		umask(old_umask);
f09e2e
+		if (tmpfd == -1) {
f09e2e
+			logit("mkstemp(): %.100s", strerror(oerrno));
f09e2e
+			return oerrno;
f09e2e
+		}
f09e2e
+
f09e2e
+		if (fchmod(tmpfd,S_IRUSR | S_IWUSR) == -1) {
f09e2e
+			oerrno = errno;
f09e2e
+			logit("fchmod(): %.100s", strerror(oerrno));
f09e2e
+			close(tmpfd);
f09e2e
+			return oerrno;
f09e2e
+		}
f09e2e
 		close(tmpfd);
f09e2e
-		return oerrno;
f09e2e
 	}
f09e2e
-	close(tmpfd);
f09e2e
+	debug("%s: Setting ccname to %s", __func__, ccname);
f09e2e
 
f09e2e
 	return (krb5_cc_resolve(ctx, ccname, ccache));
f09e2e
 }