[patch] fn_get_random_string() pseudo-random string generation

random-string-gen.patch (text/plain), 2.75 KB, created by Lorenzo Hernández García-Hierro on 2005-05-01 16:13:15 UTC

This patch adds support for generation of pseudo-random string (33 bytes)
using a simplistic seeding "algorithm" that uses the /dev/urandom pseudo-random
numbers generator device to gather  entropy, and MD5 to calculate pseudo-random
sums to be used for calculating the final MD5 sum, that is, the pseudo-random
string to be used finally (ie. for generating a random password value to be used
in automatically-created configuration or installation files).

Signed-off-by: Lorenzo Hernandez Garcia-Hierro <[e-mail]>
---

 sbin/webapp-config |   31 +++++++++++++++++++++++++++++++
 1 files changed, 31 insertions(+)

diff -puN sbin/webapp-config~random-string-gen sbin/webapp-config
--- webapp-config-1.10-r11/sbin/webapp-config~random-string-gen	2005-05-01 23:42:55.660296760 +0200
+++ webapp-config-1.10-r11-lorenzo/sbin/webapp-config	2005-05-02 00:40:58.528820264 +0200
@@ -124,6 +124,7 @@ G_F_CHECK_CONFIG=0
 G_F_SECURE=0
 G_F_SOFT=0
 G_F_LEFTBEHIND=0
+G_F_RANDSTR=0
 
 # changing these variables changes the behaviour of this script
 # you have been warned!!
@@ -2104,6 +2105,9 @@ fn_parseparams ()
 				G_NEEDSERVER=1
 				G_F_UPGRADE=1
 				;;
+			--randstr)
+				G_F_RANDSTR="1"
+				;;
 			-d|--dir) 
 				G_INSTALLDIR="$2" 
 				G_ORIG_INSTALLDIR="$2"
@@ -3018,6 +3022,29 @@ EOF
 }
 
 # ------------------------------------------------------------------------
+# fn_get_random_string()
+#
+# Generates a random string (33 bytes) using a simplistic seeding "algorithm"
+# that uses the /dev/urandom pseudo-random numbers generator device to gather
+# entropy, and MD5 to calculate pseudo-random sums to be used for calculating
+# the final MD5 sum, that is, the pseudo-random string to be used finally (ie.
+# for generating a random password value to be used in automatically-created
+# configuration or installation files).
+#
+# No parameters
+
+fn_get_random_string()
+{
+SEED1=$(head -1 /dev/urandom -c 1000 | od -N 1000 | md5sum | sed -e 's/ -//' | sed -e 's/ //')
+SEED2=$(head -1 /dev/urandom -c 10 | od -N 1000 | md5sum | sed -e 's/ -//' | sed -e 's/ //')
+SEED3=$(head -1 /dev/urandom -c 1000 | od -N 1000 | md5sum | sed -e 's/  -//' | sed -e 's/ //')
+SEED4=$(head -1 /dev/urandom -c 50 | od -N 1000 | md5sum | sed -e 's/  -//' | sed -e 's/ //')
+SEED5=$(head -1 /dev/urandom -c 1000 | od -N 1000 | md5sum | sed -e 's/  -//' | sed -e 's/ //')
+RNDSTR="$SEED1$SEED2$SEED3$SEED4$SEED5"
+RNDSTR=$(echo $RNDSTR | md5sum | sed -e 's/ -//' | sed -e 's/ //')
+}
+
+# ------------------------------------------------------------------------
 # main() - it all happens here
 #
 # Inputs:
@@ -3036,6 +3063,10 @@ main ()
 		fn_verifyparams
 	fi
 
+	if [ "${G_F_RANDSTR}" = 1 ] ; then
+		fn_get_random_string
+	fi
+
 	# the actual functions to do the work are stored in
 	# seperate scripts
 	#
_