Shulou(Shulou.com)06/02 Report--

Failed to change password prompt:

passwd: Authentication token manipulation errorpasswd: password unchanged

Reason:

Insufficient user privileges

Solution steps:

1. Use chattr -i to remove the read-only attribute of/etc/shadow and/etc/passwd files (i.e., files cannot be deleted, renamed, set link relationships, and cannot write or add new content, which is different from the read-only attribute of chmod)

a. chattr -i /etc/shadow

b. chattr -i /etc/passwd

*c. lsattr -v /etc/passwd #This step is only for viewing file attribute information and can be omitted

2. change Password

a. pwconv #enables projected password modification, allowing only system administrators to read, while replacing the original password with the "x" character, effectively strengthening the security of the system.

b. passwd

3. restore properties

a. chattr +i /etc/passwd

b. chattr +i /ect/shadow

Knowledge expansion:

/ect/passwd : store user account and password information, password is "*"

/ect/shadow: store encrypted password, corresponding to/ect/passwd account

/ect/passwd and/etc/shadow files: blog.csdn.net/yaofeino1/article/details/54616440

chattr command: https://www.linuxprobe.com/linux-chattr-root.html

lsattr command: www.runoob.com/linux/linux-comm-lsattr.html

pwconv Command: http://www.runoob.com/linux/linux-comm-pwconv.html

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