The CSA said nothing about the issue of whether secession was legal, and had little to say about tariffs that wasn't already in the U.S. consitution. They basically copied about 90% of the U.S. constiution word-for-word, updated the language to be a bit more "modern" and put in major clause stating that slavery shall forever be legal and perpetual in the CSA.
Which gives me a good deal of insight on what was on the minds of the "founding fathers" of the CSA.
Despite what some others have posted, I do not see how any government can be considered permanent if states are able to withdraw whenever they feel like it.
BTW, here's an interesting clause by clause comparison of the two documents, with commentary.
http://www.filibustercartoons.com/CSA.htm
With regard to tariffs the CSA added the following language to Section 8, "nor shall any duties or taxes on importations from foreign nations be laid to promote or foster any branch of industry." This was done to prevent protective tariffs.
Had the CSA won its independence, I suspect they would have regretted this clause very quickly. It would have prevented them from doing anything to protect even essential military industries from foreign competition. This would have left them permanently vulnerable to blockade in time of war.
So much for states' rights. Under the US Constitution states could decide whether to be slave or free. Under the CSA Constitution states could not decide to get rid of slavery.