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April 30, 2016 21:37
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It is "pseudo-shell" that will only execute provided -c command. Might be helpful for sshd users configured with "ForcedCommand" and "ChrootDirectory". (example with further references: https://goo.gl/TjhrWd ). License: This is trivial code snippet directly based on documentation and C specification, please consider it public domain.
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#include <unistd.h> | |
// compile with: gcc only_exec_command.c -static -o only_exec_command | |
// It is "pseudo-shell" that will only execute provided -c command. | |
// Usage : ./only_exec_command -c /bin/echo This is test | |
// Please note that this is far from perfect. It should actually parse and split string | |
// provided in argv[2], like shlex.Split in python. However, it's enought for my application | |
// of running one binary specified in ForceCommand sshd_config option. | |
int main(int argc, char **argv){ | |
if (argc<3) return -1; | |
if (argv[1][0] != '-' || argv[1][1] != 'c' || argv[1][2] != '\0') | |
return -1; | |
execv(argv[2], &(argv[2])); | |
return 0; | |
} |
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