From b03a48297a3dc03ea59360345f352bc449189589 Mon Sep 17 00:00:00 2001 From: Jakub Hrozek Date: Mon, 8 Aug 2011 10:57:16 +0200 Subject: Prevent segfault if vetoed_shells are specified without allowed_shells https://fedorahosted.org/sssd/ticket/954 --- src/responder/nss/nsssrv_cmd.c | 35 +++++++++++++++++++---------------- 1 file changed, 19 insertions(+), 16 deletions(-) (limited to 'src/responder/nss/nsssrv_cmd.c') diff --git a/src/responder/nss/nsssrv_cmd.c b/src/responder/nss/nsssrv_cmd.c index 5dbd3ca74..56ebe4815 100644 --- a/src/responder/nss/nsssrv_cmd.c +++ b/src/responder/nss/nsssrv_cmd.c @@ -316,8 +316,7 @@ static const char *get_shell_override(TALLOC_CTX *mem_ctx, if (!user_shell) return NULL; if (!nctx->allowed_shells && !nctx->vetoed_shells) return talloc_strdup(mem_ctx, user_shell); - if (nctx->vetoed_shells) - { + if (nctx->vetoed_shells) { for (i=0; nctx->vetoed_shells[i]; i++) { if (strcmp(nctx->vetoed_shells[i], user_shell) == 0) { DEBUG(5, ("The shell '%s' is vetoed. " @@ -327,24 +326,28 @@ static const char *get_shell_override(TALLOC_CTX *mem_ctx, } } - for (i=0; nctx->etc_shells[i]; i++) { - if (strcmp(user_shell, nctx->etc_shells[i]) == 0) { - DEBUG(9, ("Shell %s found in /etc/shells\n", - nctx->etc_shells[i])); - break; + if (nctx->etc_shells) { + for (i=0; nctx->etc_shells[i]; i++) { + if (strcmp(user_shell, nctx->etc_shells[i]) == 0) { + DEBUG(9, ("Shell %s found in /etc/shells\n", + nctx->etc_shells[i])); + break; + } } - } - if (nctx->etc_shells[i]) { - DEBUG(9, ("Using original shell '%s'\n", user_shell)); - return talloc_strdup(mem_ctx, user_shell); + if (nctx->etc_shells[i]) { + DEBUG(9, ("Using original shell '%s'\n", user_shell)); + return talloc_strdup(mem_ctx, user_shell); + } } - for (i=0; nctx->allowed_shells[i]; i++) { - if (strcmp(nctx->allowed_shells[i], user_shell) == 0) { - DEBUG(5, ("The shell '%s' is allowed but does not exist. " - "Using fallback\n", user_shell)); - return talloc_strdup(mem_ctx, nctx->shell_fallback); + if (nctx->allowed_shells) { + for (i=0; nctx->allowed_shells[i]; i++) { + if (strcmp(nctx->allowed_shells[i], user_shell) == 0) { + DEBUG(5, ("The shell '%s' is allowed but does not exist. " + "Using fallback\n", user_shell)); + return talloc_strdup(mem_ctx, nctx->shell_fallback); + } } } -- cgit