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CHAPTER 10: iPhone
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Figure 10-30. iPhone Profile Installation: provide authentication credentials
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There are a number of reasons why importing a configuration profile can fail. If, for example, the profile tells the device to configure an ActiveSync account and one is already present then the user will receive an error when they attempt to install the profile. If the user fails to enter a passcode with the appropriate passcode strength and gives up, then the entire configuration process will fail. Alternatively, if you are deploying Mail accounts which are configured to use SSL that is either self-signed, or signed by a CA which is not included in the iPhone s base trust, then the profile installation will fail, even if it contains the CA root certificate in the profile. For these instances, you may need to build out and deploy two configurations, one with the SSL certificates, and the other with the Account configuration payloads. TIP: For a list of certificates trusted by default on iPhone 3.0, see Apple Knowledge Base article HT3580: http://support.apple.com/kb/HT3580.
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Importing and Exporting Profiles
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The iPhone Configuration Utility allows for importing and exporting configuration profiles for distribution via email or web browser. To perform this task, first ensure that you have a configuration polished up and ready to go. Once this is done, highlight the profile, and then select either Share or Export from the toolbar, as shown in Figure 10-31. The former option will email the mobile configuration file, the latter will present a standard save dialog box and allow you to specify the name and location for exporting.
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CHAPTER 10: iPhone
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Figure 10-31. Exporting iPhone Configuration Profiles
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After selecting either option, you will be presented with a dialog asking whether or not you want to sign the configuration, as shown in Figure 10-31. If you are exporting this for deployment, it is highly recommended that you do so. There are a few options here. First and foremost, you can opt not to sign the profile at all. This provides no security on the file, and leaves it open for alteration without any detection capabilities. By signing the configuration, devices which seek to deploy its payload can verify that it is tamper free. Obviously, this is always desirable. Next, it is possible to simply sign the configuration, or we can encrypt it for each registered device. The former option is much more forgiven, and is desirable if you wish to deploy this to an unknown amount of iPhones, and want the task to be as hassle free as possible. Alternatively, if you have all of your iPhones cataloged in the iPhone Configuration Utility, then you can create an encrypted profile for each phone. The iPhone configuration utility signs exported profiles with a self-signed Certificate authority created when you first open the application for the first time. This certificate authority is used to sign the configuration profiles created by your copy of the application. If you are delegating configuration profile development among multiple members of your staff, you may wish to export this private key and certificate programmatically. The following is an example of perl script that will export this information with the password pass to files in the current directory where the script is run. Using this methodology you can keep all members of your group up to date with the latest copy of this certificate and private key.
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#!/usr/bin/perl -w # ipcuexport.pl Created by Zack Smith
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CHAPTER 10: iPhone
# # This script will export the iPhone Configuration Utility certificates and private key # to files in the current directory with the naming conventions below. $certname = "iPCUCertificateAuthority.crt"; $pubkey = "iPCUCertificatePublic.p12"; $privkey = "iPCUCertificatePrivate.p12" ; open(CERTS, "security export -k login.keychain -t certs|"); my $ifile = ""; my $thisfile = ""; while(<CERTS>) { $ifile .= $_; $thisfile .= $_; if($_ =~ /^\-+END(\s\w+) \sCERTIFICATE\-+$/) { $subject = `echo "$thisfile" | openssl x509 -noout -subject`; if($subject =~ m/iPCU Certificate Authority/){ $crtmodulus = `echo "$thisfile" | openssl x509 -noout -modulus`; my $fname = $certname; open CERT, ">$fname"; print CERT $thisfile; close CERT; } $thisfile = ""; } } close(CERTS); $exportPublic = `openssl x509 -inform pem -in $certname -noout -pubkey > $pubkey`; open(PRIV, "security export -k login.keychain -t privKeys -f pkcs12 -P pass | openssl pkcs12 -passin pass:pass -passout pass:pass|"); my $kfile = ""; my $thiskey = ""; while(<PRIV>) { $kfile .= $_; $thiskey .= $_; if($_ =~ /^\-+END(\s\w+) \sRSA PRIVATE KEY\-+$/) { $modulus = `echo "$thiskey" | openssl rsa -noout -modulus -passin pass:pass `; if($modulus = $crtmodulus){ my $fname = $privkey; open FILE, ">$fname"; print FILE $thiskey; close FILE; } $thiskey = ""; } } close(PRIV);
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